:root {
    color-scheme: dark;
    --color-background: rgb(14, 14, 17);
    --color-background-secondary: rgb(22, 22, 24);
    --color-background-tertiary: rgb(29, 29, 31);
    --color-background-elevated: rgb(38, 38, 41);
    --color-text-primary: rgb(250, 250, 250);
    --color-text-secondary: rgb(161, 161, 170);
    --color-text-muted: rgb(82, 82, 91);
    --color-card-meta: rgb(132, 132, 146);
    --color-border-subtle: rgba(255, 255, 255, 0.07);
    --color-border-strong: rgba(255, 255, 255, 0.11);
    --color-gradient-red: rgb(255, 99, 92);
    --color-gradient-orange: rgb(255, 153, 51);
    --color-gradient-yellow: rgb(255, 220, 64);
    --color-gradient-yellow-green: rgb(194, 255, 76);
    --color-gradient-yellow-green-fifty: rgba(194, 255, 76, 0.5);
    --color-gradient-blue: rgb(56, 189, 248);
    --color-accent-foreground: rgb(14, 14, 17);
    --color-line: rgba(255, 255, 255, 0.07);
    --color-line-secondary: rgba(255, 255, 255, 0.11);
    --color-context-surface: rgba(255, 255, 255, 0.035);
    --color-backdrop: rgba(0, 0, 0, 0.65);
    --color-modal-backdrop: rgba(0, 0, 0, 0.58);
    --color-button-primary: rgb(250, 250, 250);
    --color-button-primary-hover: rgb(226, 226, 230);
    --color-button-primary-text: rgb(14, 14, 17);
    --color-button-secondary: rgb(52, 52, 57);
    --color-button-secondary-hover: rgb(60, 60, 66);
    --color-button-secondary-text: rgb(230, 230, 234);
    --color-button-muted: rgb(29, 29, 31);
    --color-button-muted-hover: rgb(38, 38, 41);
    --color-button-disabled: rgb(36, 36, 39);
    --color-button-disabled-text: var(--color-background);
    --color-gradient-primary: linear-gradient(135deg, var(--color-gradient-red) 0%, var(--color-gradient-orange) 28%, var(--color-gradient-yellow) 52%, var(--color-gradient-yellow-green) 76%, var(--color-gradient-blue) 100%);
    --color-gradient-text-primary: linear-gradient(135deg, var(--color-gradient-yellow) 0%, var(--color-gradient-yellow-green) 55%, var(--color-gradient-blue) 100%);
    --color-gradient-selected-chip: linear-gradient(110deg, var(--color-gradient-yellow) 0%, var(--color-gradient-yellow-green) 50%, var(--color-gradient-blue) 100%);
    --color-gradient-splash: linear-gradient(-45deg, rgb(56, 189, 248), rgb(194, 255, 76));
    --color-gradient-key-signature: linear-gradient(-35deg, var(--color-gradient-blue) 50%, var(--color-gradient-yellow-green) 78%, var(--color-gradient-yellow) 100%);
    --filter-icon: none;
    --filter-ui-icon: brightness(0) invert(1);
    --shadow-panel: 0 -24px 80px rgba(0, 0, 0, 0.4);

    --height-header: 48px;
    --height-footer: 44px;
    --height-card-bottom: 80px;
    --height-card-top: 80px;
    --height-progress-reminder: 58px;

    --spacing-xxs: 4px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --scrollbar-width: 2px;

    --font-weight-thin: 100;
    --font-weight-extra-light: 200;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semi-bold: 600;
    --font-weight-bold: 700;
    --font-weight-extra-bold: 800;
    --font-weight-black: 900;

    --font-size-xxs: 0.625rem;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 1.875rem;
    --font-size-3xl: 2.25rem;
    --font-size-4xl: 3rem;

}

:root[data-theme="light"] {
    color-scheme: light;
    --color-background: rgb(248, 248, 247);
    --color-background-secondary: rgb(255, 255, 255);
    --color-background-tertiary: rgb(241, 241, 240);
    --color-background-elevated: rgb(229, 229, 228);
    --color-text-primary: rgb(20, 20, 20);
    --color-text-secondary: rgb(82, 82, 82);
    --color-text-muted: rgb(124, 124, 124);
    --color-card-meta: var(--color-text-muted);
    --color-border-subtle: rgba(20, 24, 22, 0.08);
    --color-border-strong: rgba(20, 24, 22, 0.14);
    --color-gradient-red: rgb(255, 73, 83);
    --color-gradient-orange: rgb(255, 134, 21);
    --color-gradient-yellow: rgb(255, 198, 0);
    --color-gradient-yellow-green: rgb(126, 232, 43);
    --color-gradient-yellow-green-fifty: rgba(126, 232, 43, 0.45);
    --color-gradient-blue: rgb(0, 172, 255);
    --color-accent-foreground: rgb(20, 24, 22);
    --color-line: rgba(20, 20, 20, 0.08);
    --color-line-secondary: rgba(20, 20, 20, 0.12);
    --color-context-surface: rgba(20, 20, 20, 0.035);
    --color-backdrop: rgba(20, 20, 20, 0.32);
    --color-modal-backdrop: rgba(20, 20, 20, 0.36);
    --color-button-primary: rgb(20, 20, 20);
    --color-button-primary-hover: rgb(42, 42, 42);
    --color-button-primary-text: rgb(255, 255, 255);
    --color-button-secondary: rgb(224, 224, 223);
    --color-button-secondary-hover: rgb(214, 214, 213);
    --color-button-secondary-text: rgb(28, 28, 28);
    --color-button-muted: rgb(242, 242, 241);
    --color-button-muted-hover: rgb(234, 234, 233);
    --color-button-disabled: rgb(236, 236, 235);
    --color-button-disabled-text: var(--color-background);
    --filter-icon: brightness(0) saturate(1);
    --filter-ui-icon: brightness(0) saturate(1);
    --shadow-panel: 0 -24px 80px rgba(17, 24, 39, 0.18);
}

* {
    font-family: 'Barlow Semi Condensed', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    box-sizing: border-box;
    user-select: none;
    color: inherit;
    letter-spacing: 0;
}

button {
    -webkit-tap-highlight-color: transparent;
}

button:focus,
button:focus-visible {
    outline: none;
}

html,
body {
    position: fixed;
    inset: 0;
    padding: 0;
    margin: 0;
    /* font-size: 12px; */
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    background-color: var(--color-background);
}

.safari-theme-edge {
    position: fixed;
    left: 0;
    width: 100%;
    height: 12px;
    background-color: var(--color-background);
    pointer-events: none;
    z-index: 19;
}

.safari-theme-edge-top {
    top: -8px;
}

.safari-theme-edge-bottom {
    bottom: -8px;
}

body.startup-active header,
body.startup-active #content,
body.startup-active .app-footer {
    opacity: 0;
}

body.startup-active.app-content-revealed header,
body.startup-active.app-content-revealed #content,
body.startup-active.app-content-revealed .app-footer {
    opacity: 1;
}

header {
    background-color: var(--color-background);
    position: absolute;
    inset: 0 0 auto 0;
    height: var(--height-header);
    border-bottom: 1px solid var(--color-line);
    display: grid;
    place-items: center;
    padding: 0 var(--spacing-md);
    z-index: 20;
}

.header-inner {
    width: min(100%, calc(100vh - var(--height-header) - var(--height-footer) - var(--spacing-md) - var(--spacing-md) - var(--height-progress-reminder) - var(--spacing-sm)));
    width: min(100%, calc(100dvh - var(--height-header) - var(--height-footer) - var(--spacing-md) - var(--spacing-md) - var(--height-progress-reminder) - var(--spacing-sm)));
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

#content {
    background-color: var(--color-background);
    position: absolute;
    inset: var(--height-header) 0 var(--height-footer) 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr);
    align-content: center;
    place-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.startup-screen {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: grid;
    place-items: center;
    padding: var(--spacing-lg);
    background: var(--color-gradient-splash);
    backdrop-filter: blur(12px) saturate(1.15);
    -webkit-backdrop-filter: blur(12px) saturate(1.15);
    color: rgb(255, 255, 255);
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    transition: opacity 500ms ease;
}

.startup-screen.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.startup-screen.is-hiding {
    opacity: 0;
    pointer-events: none;
}

.startup-close-action {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1;
    color: #1f1f1f;
}

.icon-button.startup-close-action:hover,
.icon-button.startup-close-action:focus-visible {
    background-color: rgba(255, 255, 255, 0.28);
}

.icon-button.startup-close-action img {
    filter: brightness(0) saturate(1);
}

.startup-content {
    width: min(640px, 100%);
    max-height: calc(100vh - var(--spacing-lg) - var(--spacing-lg));
    max-height: calc(100dvh - var(--spacing-lg) - var(--spacing-lg));
    padding: 0;
    display: grid;
    align-items: center;
    gap: var(--spacing-xl);
    overflow-y: auto;
    overscroll-behavior: contain;
    opacity: 0;
    text-align: left;
    transform: translateY(6px);
    transition: opacity 800ms ease, transform 800ms ease;
}

.startup-screen.is-content-visible .startup-content {
    opacity: 1;
    transform: none;
}

.startup-brand {
    display: grid;
    justify-items: start;
    gap: var(--spacing-xs);
}

.startup-screen[data-startup-mode="quick"] .startup-content {
    text-align: center;
}

.startup-screen[data-startup-mode="quick"] .startup-brand {
    justify-items: center;
}

.startup-screen[data-startup-mode="quick"] .startup-lockup {
    justify-content: center;
}

.startup-lockup {
    display: inline-flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-sm);
    min-width: 0;
    max-width: 100%;
}

.startup-guide {
    width: 100%;
    display: grid;
    gap: var(--spacing-md);
    animation: startupGuideIn 300ms ease both;
}

.startup-steps {
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    list-style: none;
    counter-reset: startup-step;
    border-top: 1px solid rgba(255, 255, 255, 0.28);
    border-bottom: 1px solid rgba(255, 255, 255, 0.28);
}

.startup-steps li {
    counter-increment: startup-step;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-md) 0;
    color: #1f1f1f;
    display: grid;
    align-content: start;
    gap: var(--spacing-sm);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    line-height: 1.3;
}

.startup-steps li::before {
    content: "0" counter(startup-step);
    color: #3f3f3f;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-align: left;
}

.startup-storage-note {
    flex: 1 1 auto;
    min-width: 0;
    max-width: none;
    margin: 0;
    color: #3f3f3f;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    line-height: 1.35;
}

.startup-storage-note span {
    display: block;
}

.startup-storage-note-primary {
    font-size: var(--font-size-sm);
}

.startup-screen[data-startup-mode="quick"] .startup-storage-note {
    display: none;
}

.startup-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    min-height: 36px;
}

.startup-primary-action,
.startup-text-action {
    appearance: none;
    min-height: 36px;
    border: 0;
    cursor: pointer;
    font: inherit;
    font-size: var(--font-size-me);
    /* font-weight: var(--font-weight-black); */
    line-height: 1;
    outline: none;
}

.startup-primary-action {
    flex: 0 0 auto;
    padding: 0 var(--spacing-lg);
    border: 0;
    border-radius: 999px;
    background-color: #111111;
    color: rgb(255, 255, 255);
    text-transform: capitalize;
}

.startup-text-action {
    flex: 0 0 auto;
    padding: 0 var(--spacing-md);
    border: 0;
    border-radius: 999px;
    background-color: #f2f2f2;
    color: #111111;
    text-transform: capitalize;
}

.startup-primary-action:hover {
    background-color: #222222;
    color: rgb(255, 255, 255);
}

.startup-text-action:hover {
    background-color: #e5e5e5;
    color: #000000;
}

.startup-mark {
    width: 0.92em;
    height: 0.92em;
    min-width: clamp(44px, 5.5vw, 72px);
    min-height: clamp(44px, 5.5vw, 72px);
    flex: 0 0 auto;
    background-color: #ffffff;
    -webkit-mask: url("assets/logo.svg?v=20260731-02") center / contain no-repeat;
    mask: url("assets/logo.svg?v=20260731-02") center / contain no-repeat;
}

.startup-name {
    color: #1f1f1f;
    font-size: clamp(3.75rem, 9vw, 5.75rem);
    font-weight: var(--font-weight-name);
    letter-spacing: -.02em;
    line-height: 1.2;
}

.startup-about {
    width: 100%;
    max-width: none;
    margin: 0;
    color: #ffffff;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    line-height: 1.35;
}

@keyframes startupGuideIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

.screen-size-guard {
    position: fixed;
    inset: 0;
    z-index: 360;
    display: grid;
    place-items: center;
    padding: var(--spacing-xl);
    background-color: var(--color-modal-backdrop);
    backdrop-filter: blur(14px) saturate(1.15);
    -webkit-backdrop-filter: blur(14px) saturate(1.15);
    color: var(--color-text-primary);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: opacity 250ms ease, visibility 250ms ease;
}

.screen-size-content {
    width: min(360px, 100%);
    display: grid;
    place-items: center;
    gap: var(--spacing-sm);
    text-align: center;
}

.screen-size-mark {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-xs);
    background: var(--color-gradient-text-primary);
    -webkit-mask: url("assets/logo.svg?v=20260731-02") center / contain no-repeat;
    mask: url("assets/logo.svg?v=20260731-02") center / contain no-repeat;
}

.screen-size-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-black);
    line-height: 1;
}

.screen-size-message {
    max-width: 24rem;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    line-height: 1.35;
}

.progress-reminder {
    width: min(100%, calc(100vh - var(--height-header) - var(--height-footer) - var(--spacing-md) - var(--spacing-md) - var(--height-progress-reminder) - var(--spacing-sm)));
    width: min(100%, calc(100dvh - var(--height-header) - var(--height-footer) - var(--spacing-md) - var(--spacing-md) - var(--height-progress-reminder) - var(--spacing-sm)));
    min-width: 0;
    height: auto;
    display: grid;
}

.progress-reminder-stats {
    min-width: 0;
    min-height: 0;
    border: 0;
    border-radius: 0;
    background-color: transparent;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow: hidden;
}

.progress-reminder-stat {
    min-width: 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-right: 1px solid var(--color-line-secondary);
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 2px;
    text-align: center;
}

.progress-reminder-stat:last-child {
    border-right: 0;
}

.progress-reminder-stat span,
.progress-reminder-stat em {
    overflow: hidden;
    color: var(--color-text-muted);
    font-size: var(--font-size-xxs);
    font-style: normal;
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-overflow: ellipsis;
    text-transform: uppercase;
    white-space: nowrap;
}

.progress-reminder-stat strong {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-black);
    line-height: 0.95;
    background: var(--color-gradient-text-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    width: max-content;
}

#card {
    border-radius: 17px;
    position: relative;
    width: min(100%, calc(100vh - var(--height-header) - var(--height-footer) - var(--spacing-md) - var(--spacing-md) - var(--height-progress-reminder) - var(--spacing-sm)));
    width: min(100%, calc(100dvh - var(--height-header) - var(--height-footer) - var(--spacing-md) - var(--spacing-md) - var(--height-progress-reminder) - var(--spacing-sm)));
    min-width: 0;
    min-height: 0;
    max-height: 100%;
    aspect-ratio: 1 / 1;
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.22);
    overflow: hidden;
}

#cardQuestionBackground {
    position: absolute;
    inset: 0;
    background: transparent;
}

#cardAnswerBackground {
    position: absolute;
    inset: 0;
    background: var(--color-button-muted-hover);
    opacity: 0;
}

#card.showing-answer #cardAnswerBackground {
    opacity: .55;
}

#cardContent {
    background-color: var(--color-background-secondary);
    position: absolute;
    inset: 0;
    overflow: hidden;
}

#cardHeader {
    position: absolute;
    height: var(--height-card-top);
    inset: 0 0 auto 0;
    border-bottom: 1px solid var(--color-line-secondary);
    display: flex;
    flex-direction: row;
    align-items: center;
    overflow: hidden;

}

#cardHeader>div {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

#cardHeaderText {
    position: absolute;
    right: var(--spacing-lg);
    left: var(--spacing-lg);
    z-index: 2;
    align-items: flex-end;
    gap: var(--spacing-xs);
    text-align: right;
}

#selectedKey {
    max-width: 100%;

    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 3rem;
    font-weight: var(--font-weight-black);
    line-height: 0.9;
}

#selectedKeyMeta {
    max-width: 100%;
    overflow: hidden;
    color: var(--color-card-meta);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-overflow: ellipsis;
    text-transform: uppercase;
    white-space: nowrap;
}

#keySignature {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    /* opacity: 0.5 !important; */
    -webkit-mask-image: linear-gradient(to right, black 0%, rgba(255, 255, 255, .1) 70%, transparent 100%);
    mask-image: linear-gradient(to right, black 0%, rgba(255, 255, 255, .1) 70%, transparent 100%);
}

#keySignature::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--color-gradient-key-signature);
    -webkit-mask: var(--key-signature-art) left center / cover no-repeat;
    mask: var(--key-signature-art) left center / cover no-repeat;
    pointer-events: none;
}

#keySignature>img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: left center;
    opacity: 0;
}

#cardSlider {
    position: absolute;
    inset: var(--height-card-top) 0 var(--height-card-bottom) 0;
}

#cardButtons {
    position: absolute;
    height: var(--height-card-bottom);
    inset: auto 0 0 0;
    border-top: 1px solid var(--color-line-secondary);
}


.card-slider-content {
    width: 200%;
    height: 100%;
    display: flex;
    flex-direction: row;
    position: absolute;
    transform: translateX(0%);
    transition: transform 250ms ease;
}

.card-slider-content>div {
    width: 50%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

#selectedKey,
#selectedKeyMeta,
#keySignature,
#cardQuestionSentence,
#skipQuestionButton,
#cardQuestionText,
#cardAnswer>div {
    opacity: 1;
    transition: opacity 140ms ease;
}

#card.is-changing-key #selectedKey,
#card.is-changing-key #selectedKeyMeta,
#card.is-changing-signature #keySignature,
#card.is-changing-question #cardQuestionSentence,
#card.is-changing-question #skipQuestionButton,
#card.is-changing-question #cardQuestionText,
#card.is-changing-answer #cardAnswer>div {
    opacity: 0;
}

#cardQuestionText,
#cardAnswer>div {
    background: var(--color-gradient-text-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: clamp(4.25rem, 21vw, 7.5rem);
    font-weight: var(--font-weight-black);
}

#cardQuestion {
    position: relative;
}

.card-question-topline {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    left: var(--spacing-lg);
    z-index: 2;
    display: grid;
    justify-items: center;
    gap: var(--spacing-xs);
}

#cardQuestionSentence {
    max-width: 100%;
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
    line-height: 1.2;
    text-align: center;
    pointer-events: none;
}

#skipQuestionButton {
    appearance: none;
    min-height: 28px;
    padding: 0 var(--spacing-sm);
    border: 0;
    border-radius: 999px;
    background-color: var(--color-button-muted);
    color: var(--color-text-secondary);
    cursor: pointer;
    font: inherit;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-transform: capitalize;
    white-space: nowrap;
}

#skipQuestionButton:hover,
#skipQuestionButton:focus-visible {
    background-color: var(--color-button-muted-hover);
    color: var(--color-text-primary);
}

#card.showing-answer .card-slider-content {
    transform: translateX(-50%);
}

#backButton {
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    width: 36px;
    height: 36px;
    padding: 0;
    border: 0;
    border-radius: 8px;
    background-color: var(--color-button-muted);
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
}

#card.showing-answer #backButton {
    opacity: 1;
    pointer-events: auto;
}

#backButton:hover {
    background-color: var(--color-button-muted-hover);
}

#backButton img {
    width: 18px;
    height: 18px;
}

.brand-title {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    line-height: 1.1;
}

.brand-logo {
    width: 26px;
    height: 26px;
    display: block;
    flex: 0 0 auto;
    background: var(--color-gradient-text-primary);
    -webkit-mask: url("assets/logo.svg?v=20260731-02") center / contain no-repeat;
    mask: url("assets/logo.svg?v=20260731-02") center / contain no-repeat;
}

.brand-name {
    /* color: var(--color-text-secondary); */
    font-size: var(--font-size-xl);
    /* font-weight: var(--font-weight-black); */
}

.header-actions {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.icon-button {
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    border-radius: 8px;
    background-color: transparent;
    cursor: pointer;
}

.icon-button:hover {
    background-color: var(--color-background-elevated);
}

.theme-toggle,
.dashboard-toggle,
.help-toggle {
    color: var(--color-text-secondary);
}

.theme-toggle img,
.dashboard-toggle img,
.help-toggle img {
    opacity: 0.68;
}

.theme-toggle:hover img,
.dashboard-toggle:hover img,
.help-toggle:hover img {
    opacity: 1;
}

.theme-icon {
    display: none;
}

:root[data-theme-mode="light"] .theme-icon,
:root[data-theme-mode="dark"] .theme-icon {
    display: none;
}

:root[data-theme-mode="light"] .theme-icon-light,
:root[data-theme-mode="dark"] .theme-icon-dark {
    display: block;
}

.icon-button img,
.icon-button svg {
    width: 21px;
    height: 21px;
}

.theme-toggle .theme-icon {
    width: 20px;
    height: 20px;
}

.icon-button img,
#backButton img {
    filter: var(--filter-ui-icon);
}

#keySignature>img {
    filter: var(--filter-icon);
}

.app-footer {
    position: absolute;
    inset: auto 0 0 0;
    min-height: var(--height-footer);
    padding: var(--spacing-xs) var(--spacing-md);
    border-top: 1px solid var(--color-line);
    background-color: var(--color-background);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    z-index: 20;
}

.copyright {
    min-width: 0;
}

.copyright {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: var(--font-size-xs);
}

.info-modal {
    position: fixed;
    inset: 0;
    z-index: 130;
    display: grid;
    place-items: center;
    justify-items: center;
}

.info-modal-backdrop {
    appearance: none;
    position: absolute;
    inset: 0;
    border: 0;
    background-color: var(--color-modal-backdrop);
    backdrop-filter: blur(10px) saturate(1.1);
    -webkit-backdrop-filter: blur(10px) saturate(1.1);
    cursor: pointer;
}

.confirm-modal {
    position: fixed;
    inset: 0;
    z-index: 150;
    display: grid;
    place-items: center;
    padding: var(--spacing-lg);
}

.confirm-modal-backdrop {
    appearance: none;
    position: absolute;
    inset: 0;
    border: 0;
    background-color: var(--color-modal-backdrop);
    backdrop-filter: blur(10px) saturate(1.1);
    -webkit-backdrop-filter: blur(10px) saturate(1.1);
    cursor: pointer;
}

.confirm-dialog {
    position: relative;
    z-index: 1;
    width: min(380px, 100%);
    border: 0;
    border-radius: 14px;
    background-color: var(--color-background-secondary);
    color: var(--color-text-primary);
    overflow: hidden;
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.24);
}

.confirm-dialog-header {
    min-height: 52px;
    padding: 0 var(--spacing-lg);
    border-bottom: 1px solid var(--color-line-secondary);
    display: flex;
    align-items: center;
}

.confirm-dialog-header h2 {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-black);
    line-height: 1.1;
}

.confirm-dialog-body {
    padding: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1.45;
}

.confirm-dialog-body p {
    margin: 0;
}

.confirm-dialog-body strong {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-black);
}

.confirm-dialog-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-xs);
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.confirm-button {
    appearance: none;
    width: 100%;
    min-height: 36px;
    padding: 0 var(--spacing-sm);
    border: 0;
    border-radius: 7px;
    cursor: pointer;
    font: inherit;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-transform: capitalize;
}

.confirm-button-secondary {
    background-color: var(--color-button-secondary);
    color: var(--color-button-secondary-text);
}

.confirm-button-secondary:hover {
    background-color: var(--color-button-secondary-hover);
    color: var(--color-text-primary);
}

.confirm-button-primary {
    background-color: var(--color-gradient-red);
    color: var(--color-accent-foreground);
}

.confirm-button-primary:hover {
    background-color: var(--color-gradient-red);
    color: var(--color-accent-foreground);
    filter: brightness(1.06);
}

.info-dialog {
    position: relative;
    z-index: 1;
    width: min(420px, calc(100vw - var(--spacing-xl)));
    max-height: calc(100vh - var(--spacing-2xl));
    justify-self: center;
    align-self: center;
    border: 1px solid var(--color-line);
    border-radius: 25px;
    background-color: var(--color-background-secondary);
    color: var(--color-text-primary);
    overflow: hidden;
}

.info-dialog-header {
    min-height: 56px;
    padding: 0 var(--spacing-sm) 0 var(--spacing-lg);
    border-bottom: 1px solid var(--color-line-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.info-dialog-header h2 {
    margin: 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
    line-height: 1.15;
}

.info-dialog-body {
    padding: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1.55;
}

.info-about {
    min-height: 220px;
    display: grid;
    place-items: center;
    align-content: center;
    gap: var(--spacing-xs);
    text-align: center;
}

.info-logo {
    width: 82px;
    height: 82px;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.info-app-name {
    color: var(--color-text-primary);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-black);
    line-height: 1;
}

.info-dialog-body p,
.info-dialog-body ol {
    margin: 0;
}

.info-summary {
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-bold);
}

.info-summary+.info-steps {
    margin-top: var(--spacing-md);
}

.info-steps {
    padding: 0;
    list-style: none;
    counter-reset: info-step;
}

.info-steps li {
    counter-increment: info-step;
    position: relative;
    min-height: 34px;
    padding: var(--spacing-xs) 0 var(--spacing-xs) 42px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-line);
    color: var(--color-text-secondary);
}

.info-steps li:last-child {
    border-bottom: 0;
}

.info-steps li::before {
    content: counter(info-step);
    position: absolute;
    left: 0;
    top: 50%;
    width: 24px;
    height: 24px;
    border-radius: 999px;
    background: var(--color-button-primary);
    color: var(--color-button-primary-text);
    display: grid;
    place-items: center;
    transform: translateY(-50%);
    font-size: var(--font-size-xxs);
    font-weight: var(--font-weight-black);
}

.info-steps li+li {
    margin-top: var(--spacing-sm);
}

#cardButtons>.card-slider-content>div {
    position: relative;
    padding: var(--spacing-md);
}

#cardButtons button {
    appearance: none;
    border: 0;
    cursor: pointer;
    font: inherit;
}

.btn,
#revealButton,
#showAnswerButton {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 0 var(--spacing-lg);
    border: 0;
    border-radius: 12px;
    background-color: var(--color-button-primary);
    color: var(--color-button-primary-text);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-extra-bold);
    white-space: nowrap;
}

.btn:hover,
#revealButton:hover,
#showAnswerButton:hover {
    background-color: var(--color-button-primary-hover);
}

#ratingRow {
    position: relative;
    display: flex;
    gap: var(--spacing-xs);
}

#questionPrompt,
#ratingPrompt {
    position: absolute;
    right: 0;
    bottom: calc(100% + var(--spacing-sm));
    left: 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    text-align: center;
    pointer-events: none;
}

#questionPrompt {
    --question-context-line-gap: var(--spacing-sm);
    --question-context-line-edge: var(--spacing-md);
    display: flex;
    justify-content: center;
    right: var(--spacing-md);
    left: var(--spacing-md);
    width: auto;
    line-height: 1;
    background: none;
    -webkit-text-fill-color: currentColor;
}

.question-context-metrics {
    position: relative;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
    justify-content: center;
    gap: 0;
    width: 100%;
}

.question-context-metrics:has(.question-context-metric)::before {
    content: "";
    position: absolute;
    right: calc(-1 * var(--question-context-line-edge));
    left: calc(-1 * var(--question-context-line-edge));
    top: calc(-1 * var(--question-context-line-gap));
    border-top: 1px solid var(--color-line-secondary);
}

.question-context-metric,
.question-context-pill {
    min-width: 0;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 0;
    border-radius: 0;
    background-color: transparent;
    display: grid;
    gap: 3px;
}

.question-context-metric {
    border-right: 1px solid var(--color-line-secondary);
    justify-items: center;
    text-align: center;
}

.question-context-metric:last-child {
    border-right: 0;
}

.question-context-pill {
    padding: 0;
    border: 0;
    border-radius: 0;
    background-color: transparent;
    color: var(--color-text-muted);
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-transform: uppercase;
    grid-column: 1 / -1;
}

.question-context-metric strong {
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-black);
    line-height: 1;
}

.question-context-metric span {
    color: var(--color-text-secondary);
    font-size: var(--font-size-xxs);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.question-context-rating strong {
    color: currentColor;
}

.question-context-rating-1 {
    color: var(--color-gradient-red);
}

.question-context-rating-2 {
    color: var(--color-gradient-orange);
}

.question-context-rating-3 {
    color: var(--color-gradient-yellow);
}

.question-context-rating-4 {
    color: var(--color-gradient-yellow-green);
}

.question-context-rating-5 {
    color: var(--color-gradient-blue);
}

.rating-btn {
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 0;
    height: 100%;
    padding: var(--spacing-xs);
    border-radius: 10px;
    color: var(--color-accent-foreground);
    opacity: 1;
    filter: none;
}

.rating-btn:hover {
    filter: brightness(1.06);
}

.rating-number {
    font-size: 2rem;
    font-weight: var(--font-weight-black);
    line-height: .8;
}

.rating-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-extra-bold);
    line-height: 1;
    white-space: nowrap;
}

.rating-btn[data-rating="1"] {
    background-color: var(--color-gradient-red);
}

.rating-btn[data-rating="2"] {
    background-color: var(--color-gradient-orange);
}

.rating-btn[data-rating="3"] {
    background-color: var(--color-gradient-yellow);
}

.rating-btn[data-rating="4"] {
    background-color: var(--color-gradient-yellow-green);
}

.rating-btn[data-rating="5"] {
    background-color: var(--color-gradient-blue);
}

#panelBackdrop {
    position: fixed;
    inset: 0;
    z-index: 100;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.app-panel {
    position: fixed;
    top: var(--height-header);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 110;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    max-height: none;
    border-radius: 16px 16px 0 0;
    background-color: var(--color-background-secondary);
    box-shadow: var(--shadow-panel);
    overflow: hidden;
    transform: translateY(calc(100% + var(--spacing-md)));
    pointer-events: none;
}

.app-panel.is-open {
    transform: translateY(0);
    pointer-events: auto;
}

#progressPanel {
    --dashboard-button-secondary: rgb(72, 72, 79);
    --dashboard-button-secondary-hover: rgb(82, 82, 90);
    --dashboard-button-secondary-text: rgb(250, 250, 250);
    --dashboard-button-disabled: rgb(54, 54, 58);
    --dashboard-button-disabled-text: var(--color-background-tertiary);
    --dashboard-scroll-shadow-height: 18px;
    --dashboard-scroll-shadow: rgba(0, 0, 0, 0.32);
}

:root[data-theme="light"] #progressPanel {
    --color-background-tertiary: rgb(247, 247, 246);
    --color-background-elevated: rgb(240, 240, 239);
    --color-button-muted: rgb(249, 249, 248);
    --color-button-muted-hover: rgb(242, 242, 241);
    --dashboard-button-secondary: rgb(210, 210, 209);
    --dashboard-button-secondary-hover: rgb(200, 200, 199);
    --dashboard-button-secondary-text: rgb(20, 20, 20);
    --dashboard-button-disabled: rgb(224, 224, 223);
    --dashboard-button-disabled-text: var(--color-background);
    --dashboard-scroll-shadow: rgba(20, 20, 20, 0.14);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    min-height: 64px;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-line);
    background-color: var(--color-background-secondary);
}

.panel-title {
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-lg);
    line-height: 1.1;
}

.panel-title-icon {
    width: 1.15em;
    height: 1.15em;
    flex: 0 0 auto;
    filter: var(--filter-ui-icon);
    opacity: 0.68;
}

.panel-body {
    min-height: 0;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
    overscroll-behavior: contain;
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

.panel-section {
    display: grid;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-line);
}

.panel-section:last-child {
    border-bottom: 0;
}

.panel-summary-section {
    position: relative;
    z-index: 2;
    min-height: 0;
}

.panel-summary-section::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: calc(-1 * var(--dashboard-scroll-shadow-height));
    left: 0;
    height: var(--dashboard-scroll-shadow-height);
    background: linear-gradient(to bottom, var(--dashboard-scroll-shadow), rgba(0, 0, 0, 0));
    pointer-events: none;
}

.panel-list-section {
    --panel-list-top-padding: var(--spacing-md);
    position: relative;
    z-index: 1;
    gap: 0;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom, 0px));
}

.panel-section.panel-list-section {
    padding-top: 0;
}

#keyProgressList {
    padding-top: var(--panel-list-top-padding);
}

#statsGrid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-md);
}

.stat {
    display: grid;
    align-content: start;
    gap: var(--spacing-sm);
    min-height: 84px;
    padding: var(--spacing-md);
    border: 0;
    border-radius: 10px;
    background-color: var(--color-background-tertiary);
}

.stat.is-selected,
.key-progress-row.is-selected {
    background-color: var(--color-background-elevated);
}

.stat-summary {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.stat-summary .key-progress-stat.is-primary strong {
    font-size: var(--font-size-2xl);
    background: var(--color-gradient-text-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    width: max-content;
}

#keyProgressList,
.key-progress-group {
    display: grid;
    gap: var(--spacing-md);
}

.key-progress-group {
    gap: var(--spacing-sm);
}

.key-progress-group h4 {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.key-progress-row {
    display: grid;
    grid-template-columns: minmax(70px, 0.8fr) minmax(0, 2fr) auto;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border: 0;
    border-radius: 10px;
    background-color: var(--color-background-tertiary);
}

.key-progress-title {
    color: var(--color-text-primary);
    display: grid;
    align-items: center;
    gap: var(--spacing-xs);
    justify-items: start;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-black);
    line-height: 1;
}

.key-selected-chip {
    padding: 4px 7px;
    border-radius: 999px;
    border: 0;
    font-size: var(--font-size-xxs);
    font-style: normal;
    font-weight: var(--font-weight-black);
    line-height: 1;
    text-transform: uppercase;
}

.key-selected-chip.is-selected {
    background: var(--color-gradient-selected-chip);
    background-position: center;
    background-size: 260% 100%;
    color: var(--color-accent-foreground);
}

.key-selected-chip.is-not-selected {
    background: var(--color-background-secondary);
    color: var(--color-text-muted);
    opacity: 0.7;
}

.key-progress-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-xs);
    align-items: center;
}

.key-progress-stat {
    min-width: 0;
}

.key-progress-stat strong,
.key-progress-stat span {
    display: block;
    line-height: 1;
}

.key-progress-stat strong {
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-black);
}

.key-progress-stat span {
    margin-top: var(--spacing-xxs);
    color: var(--color-text-muted);
    font-size: var(--font-size-xxs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.key-progress-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xs);
}

.key-progress-select,
.key-progress-reset,
.stat-select,
.stat-reset {
    appearance: none;
    width: 112px;
    min-height: 32px;
    padding: 0 var(--spacing-sm);
    border: 0;
    border-radius: 7px;
    background-color: var(--dashboard-button-secondary);
    color: var(--dashboard-button-secondary-text);
    cursor: pointer;
    font: inherit;
    font-size: var(--font-size-xs);
    /* font-weight: var(--font-weight-black); */
    line-height: 1;
    /* text-transform: uppercase; */
}

.key-progress-select:hover,
.stat-select:hover {
    background-color: var(--dashboard-button-secondary-hover);
    color: var(--color-text-primary);
}

.key-progress-reset,
.stat-reset {
    background-color: var(--color-gradient-red);
    color: var(--color-accent-foreground);
}

.key-progress-reset:hover,
.stat-reset:hover {
    background-color: var(--color-gradient-red);
    color: var(--color-accent-foreground);
    filter: brightness(1.06);
}

.key-progress-row.is-selected .key-progress-select,
.stat.is-selected .stat-select {
    background-color: var(--color-button-primary);
    color: var(--color-button-primary-text);
}

.key-progress-row.is-selected .key-progress-select:hover,
.stat.is-selected .stat-select:hover {
    background-color: var(--color-button-primary-hover);
    color: var(--color-button-primary-text);
}

.key-progress-reset:disabled,
.stat-reset:disabled {
    background-color: var(--dashboard-button-disabled);
    color: var(--dashboard-button-disabled-text);
    cursor: default;
    filter: none;
    opacity: 1;
}

.key-progress-reset:disabled:hover,
.stat-reset:disabled:hover {
    background-color: var(--dashboard-button-disabled);
    color: var(--dashboard-button-disabled-text);
    filter: none;
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-black);
    line-height: 1.1;
    background: var(--color-gradient-text-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    width: min-content;
}

.stat-label {
    margin-top: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: var(--font-size-xxs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-label span+span::before {
    content: "\00a0";
}

#progressPanel .panel-title {
    font-size: var(--font-size-xl);
}

#progressPanel .stat-summary .key-progress-stat.is-primary strong {
    font-size: var(--font-size-3xl);
}

#progressPanel .key-progress-title,
#progressPanel .key-progress-stat strong {
    font-size: var(--font-size-base);
}

#progressPanel .key-progress-title {
    font-size: var(--font-size-md);
}

#progressPanel .stat-label,
#progressPanel .key-progress-stat span,
#progressPanel .key-progress-select,
#progressPanel .key-progress-reset,
#progressPanel .stat-select,
#progressPanel .stat-reset {
    font-size: var(--font-size-xs);
}

.score {
    background: var(--color-gradient-text-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-weight-black);
    white-space: nowrap;
}

.empty {
    padding: var(--spacing-sm);
    border: 0;
    border-radius: 10px;
    background-color: var(--color-background-tertiary);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.tiny {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    line-height: 1.4;
}

[hidden] {
    display: none !important;
}

@media (max-width: 520px) {
    :root {
        /*
         * Fluid from the current 320px mobile values to the desktop values
         * at 520px. clamp() prevents further shrinking below 320px and
         * further growth above 520px.
         */
        --height-header: clamp(42px, calc(32.4px + 3vw), 48px);
        --height-footer: clamp(34px, calc(18px + 5vw), 44px);
        --height-card-bottom: clamp(64px, calc(38.4px + 8vw), 80px);
        --height-card-top: clamp(62px, calc(33.2px + 9vw), 80px);
        --height-progress-reminder: clamp(46px, calc(26.8px + 6vw), 58px);

        --spacing-xs: clamp(6px, calc(2.8px + 1vw), 8px);
        --spacing-sm: clamp(8px, calc(1.6px + 2vw), 12px);
        --spacing-md: clamp(12px, calc(5.6px + 2vw), 16px);
        --spacing-lg: clamp(16px, calc(3.2px + 4vw), 24px);
        --spacing-xl: clamp(22px, calc(6px + 5vw), 32px);
        --spacing-2xl: clamp(32px, calc(6.4px + 8vw), 48px);

        --font-size-xxs: clamp(0.55rem, calc(0.43rem + 0.6vw), 0.625rem);
        --font-size-xs: clamp(0.625rem, calc(0.425rem + 1vw), 0.75rem);
        --font-size-sm: clamp(0.75rem, calc(0.55rem + 1vw), 0.875rem);
        --font-size-base: clamp(0.875rem, calc(0.675rem + 1vw), 1rem);
        --font-size-md: clamp(1rem, calc(0.8rem + 1vw), 1.125rem);
        --font-size-lg: clamp(1.125rem, calc(0.925rem + 1vw), 1.25rem);
        --font-size-xl: clamp(1.25rem, calc(0.85rem + 2vw), 1.5rem);
        --font-size-2xl: clamp(1.45rem, calc(0.77rem + 3.4vw), 1.875rem);
        --font-size-3xl: clamp(1.65rem, calc(0.69rem + 4.8vw), 2.25rem);
        --font-size-4xl: clamp(2.1rem, calc(0.66rem + 7.2vw), 3rem);
    }

    header {
        padding: 0 var(--spacing-sm);
    }

    .header-inner {
        gap: var(--spacing-xs);
    }

    .brand-logo {
        width: clamp(22px, calc(15.6px + 2vw), 26px);
        height: clamp(22px, calc(15.6px + 2vw), 26px);
    }

    .brand-name {
        font-size: clamp(1.125rem, calc(0.525rem + 3vw), 1.5rem);
    }

    .icon-button {
        width: clamp(32px, calc(25.6px + 2vw), 36px);
        height: clamp(32px, calc(25.6px + 2vw), 36px);
        border-radius: clamp(7px, calc(5.4px + 0.5vw), 8px);
    }

    .icon-button img,
    .icon-button svg {
        width: clamp(19px, calc(15.8px + 1vw), 21px);
        height: clamp(19px, calc(15.8px + 1vw), 21px);
    }

    .theme-toggle .theme-icon {
        width: clamp(20px, calc(22.6px - 0.5vw), 21px);
        height: clamp(20px, calc(22.6px - 0.5vw), 21px);
    }

    #content {
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
    }

    .startup-screen {
        padding: var(--spacing-lg);
    }

    .startup-content {
        max-height: calc(100vh - var(--spacing-lg) - var(--spacing-lg));
        max-height: calc(100dvh - var(--spacing-lg) - var(--spacing-lg));
        gap: var(--spacing-sm);
    }

    .startup-mark {
        min-width: clamp(38px, calc(28.4px + 3vw), 44px);
        min-height: clamp(38px, calc(28.4px + 3vw), 44px);
    }

    .startup-name {
        font-size: clamp(2.55rem, calc(0.63rem + 9.6vw), 3.75rem);
    }

    .startup-steps li {
        font-size: clamp(0.625rem, calc(0.225rem + 2vw), 0.875rem);
    }

    .startup-storage-note {
        font-size: var(--font-size-xs);
    }

    .startup-about {
        font-size: clamp(1rem, calc(0.2rem + 4vw), 1.5rem);
    }

    .startup-steps {
        grid-template-columns: 1fr;
        margin: var(--spacing-xl) 0;
        border-bottom: 0;
    }

    .startup-steps li {
        grid-template-columns: auto minmax(0, 1fr);
        align-items: start;
        gap: var(--spacing-xs);
        padding: var(--spacing-xs) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.28);
    }

    .startup-steps li::before {
        font-size: clamp(0.875rem, calc(0.275rem + 3vw), 1.25rem);
    }

    .startup-actions {
        align-items: flex-start;
        flex-direction: column;
        gap: var(--spacing-xs);
        min-height: 0;
    }

    .startup-text-action {
        min-height: clamp(32px, calc(25.6px + 2vw), 36px);
        padding: 0 var(--spacing-md);
        font-size: clamp(0.625rem, calc(0.025rem + 3vw), 1rem);
    }

    .startup-primary-action {
        min-height: 36px;
        padding: 0 24px;
        font-size: clamp(0.875rem, calc(0.675rem + 1vw), 1rem);
    }

    .startup-storage-note {
        max-width: none;
    }

    .screen-size-guard {
        padding: var(--spacing-lg);
    }

    .screen-size-content {
        gap: var(--spacing-xs);
    }

    .screen-size-mark {
        width: clamp(48px, calc(22.4px + 8vw), 64px);
        height: clamp(48px, calc(22.4px + 8vw), 64px);
        margin-bottom: 0;
    }

    .screen-size-title {
        font-size: clamp(1.25rem, calc(0.25rem + 5vw), 1.875rem);
    }

    .screen-size-message {
        font-size: clamp(0.625rem, calc(0.225rem + 2vw), 0.875rem);
    }

    .progress-reminder-stat {
        padding: var(--spacing-xxs) var(--spacing-xs);
    }

    .progress-reminder-stat strong {
        font-size: clamp(1rem, calc(0.2rem + 4vw), 1.5rem);
    }

    #card {
        border-radius: clamp(14px, calc(9.2px + 1.5vw), 17px);
    }

    #cardContent {
        border-radius: 21px;
    }

    #cardHeaderText {
        right: var(--spacing-md);
        left: var(--spacing-md);
        gap: var(--spacing-sm);
    }

    #selectedKey {
        font-size: clamp(2rem, calc(0.4rem + 8vw), 3rem);
    }

    #selectedKeyMeta {
        font-size: clamp(0.55rem, calc(0.23rem + 1.6vw), 0.75rem);
    }

    .card-question-topline {
        top: var(--spacing-sm);
        right: var(--spacing-md);
        left: var(--spacing-md);
        gap: var(--spacing-xxs);
    }

    #cardQuestionSentence {
        font-size: clamp(0.75rem, calc(-0.05rem + 4vw), 1.25rem);
    }

    #skipQuestionButton {
        min-height: clamp(22px, calc(12.4px + 3vw), 28px);
        padding: 0 var(--spacing-xs);
        font-size: clamp(0.55rem, calc(0.23rem + 1.6vw), 0.75rem);
    }

    #cardQuestionText,
    #cardAnswer>div {
        font-size: clamp(3.65rem, calc(-1.43rem + 25.4vw), 6.825rem);
    }

    #backButton {
        top: var(--spacing-sm);
        left: var(--spacing-sm);
        width: clamp(30px, calc(20.4px + 3vw), 36px);
        height: clamp(30px, calc(20.4px + 3vw), 36px);
        border-radius: clamp(7px, calc(5.4px + 0.5vw), 8px);
    }

    #backButton img {
        width: clamp(16px, calc(12.8px + 1vw), 18px);
        height: clamp(16px, calc(12.8px + 1vw), 18px);
    }

    #cardButtons>.card-slider-content>div {
        padding: var(--spacing-sm);
    }

    .btn,
    #revealButton,
    #showAnswerButton {
        border-radius: clamp(9px, calc(4.2px + 1.5vw), 12px);
        padding: 0 var(--spacing-sm);
        font-size: clamp(0.75rem, calc(0.35rem + 2vw), 1rem);
    }

    #ratingRow {
        gap: var(--spacing-xxs);
    }

    #questionPrompt,
    #ratingPrompt {
        bottom: calc(100% + var(--spacing-xs));
        font-size: clamp(0.625rem, calc(0.225rem + 2vw), 0.875rem);
    }

    #questionPrompt {
        --question-context-line-gap: var(--spacing-xs);
    }

    .question-context-metrics {
        gap: 0;
    }

    .question-context-metric {
        padding: var(--spacing-xxs) var(--spacing-xs);
        border-radius: 0;
        gap: 2px;
    }

    .question-context-pill,
    .question-context-metric span {
        letter-spacing: 0;
    }

    .question-context-pill,
    .question-context-metric strong {
        font-size: clamp(0.625rem, calc(0.225rem + 2vw), 0.875rem);
    }

    .question-context-metric span {
        font-size: var(--font-size-xxs);
    }

    .rating-number {
        font-size: clamp(1.45rem, calc(0.57rem + 4.4vw), 2rem);
    }

    .rating-label {
        font-size: clamp(0.55rem, calc(0.23rem + 1.6vw), 0.75rem);
    }

    .app-footer {
        padding: var(--spacing-xxs) var(--spacing-sm);
    }

    .copyright {
        font-size: clamp(0.55rem, calc(0.23rem + 1.6vw), 0.75rem);
    }

    .confirm-modal {
        padding: var(--spacing-sm);
    }

    .confirm-dialog {
        border-radius: clamp(12px, calc(8.8px + 1vw), 14px);
    }

    .confirm-dialog-header {
        min-height: clamp(44px, calc(31.2px + 4vw), 52px);
        padding: 0 var(--spacing-md);
    }

    .confirm-dialog-body {
        padding: var(--spacing-md);
        font-size: clamp(0.625rem, calc(0.225rem + 2vw), 0.875rem);
    }

    .confirm-dialog-actions {
        padding: 0 var(--spacing-md) var(--spacing-md);
    }

    .confirm-button {
        min-height: clamp(30px, calc(20.4px + 3vw), 36px);
        font-size: clamp(0.55rem, calc(0.23rem + 1.6vw), 0.75rem);
    }

    .info-dialog {
        width: min(420px, calc(100vw - var(--spacing-md) - var(--spacing-md)));
        max-height: calc(100vh - var(--spacing-md) - var(--spacing-md));
        max-height: calc(100dvh - var(--spacing-md) - var(--spacing-md));
        border-radius: clamp(16px, calc(1.6px + 4.5vw), 25px);
    }

    .info-dialog-header {
        min-height: clamp(44px, calc(24.8px + 6vw), 56px);
        padding: 0 var(--spacing-xs) 0 var(--spacing-md);
    }

    .info-dialog-body {
        padding: var(--spacing-md);
        font-size: clamp(0.625rem, calc(0.225rem + 2vw), 0.875rem);
        line-height: 1.4;
    }

    .info-about {
        min-height: clamp(150px, calc(38px + 35vw), 220px);
    }

    .info-logo {
        width: clamp(56px, calc(14.4px + 13vw), 82px);
        height: clamp(56px, calc(14.4px + 13vw), 82px);
        margin-bottom: var(--spacing-xs);
    }

    .info-app-name {
        font-size: clamp(1.45rem, calc(0.17rem + 6.4vw), 2.25rem);
    }

    .info-summary+.info-steps {
        margin-top: var(--spacing-sm);
    }

    .info-steps li {
        min-height: clamp(28px, calc(18.4px + 3vw), 34px);
        padding: var(--spacing-xxs) 0 var(--spacing-xxs) clamp(32px, calc(16px + 5vw), 42px);
    }

    .info-steps li::before {
        width: clamp(20px, calc(13.6px + 2vw), 24px);
        height: clamp(20px, calc(13.6px + 2vw), 24px);
    }

    #progressPanel .stat-label,
    #progressPanel .key-progress-group h4,
    #progressPanel .key-progress-stat span,
    #progressPanel .key-selected-chip,
    #progressPanel .key-progress-select,
    #progressPanel .key-progress-reset,
    #progressPanel .stat-select,
    #progressPanel .stat-reset {
        letter-spacing: 0;
    }

    #progressPanel .reset-progress-word {
        display: none;
    }

    #progressPanel .panel-header {
        min-height: clamp(48px, calc(22.4px + 8vw), 64px);
        padding:
            clamp(6px, calc(-10px + 5vw), 16px) clamp(8px, calc(-4.8px + 4vw), 16px);
        gap: var(--spacing-xs);
    }

    #statsGrid {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--spacing-xs);
    }

    #keyProgressList {
        gap: var(--spacing-sm);
    }

    .key-progress-group {
        gap: var(--spacing-xs);
    }

    .panel-section {
        padding: clamp(8px, calc(-4.8px + 4vw), 16px);
    }

    .panel-list-section {
        --panel-list-top-padding: var(--spacing-sm);
    }

    .stat,
    .key-progress-row {
        gap: var(--spacing-xs);
    }

    .stat {
        grid-template-columns: minmax(48px, 0.72fr) minmax(72px, 1fr) minmax(78px, 0.9fr);
        grid-template-rows: repeat(2, minmax(0, auto));
        align-items: center;
        min-height: 0;
        padding: clamp(8px, calc(-4.8px + 4vw), 16px);
    }

    #progressPanel .stat-label {
        grid-column: 1;
        grid-row: 1 / span 2;
        margin-top: 0;
        padding: 0;
        color: var(--color-text-primary);
        font-size: var(--font-size-md);
        font-weight: var(--font-weight-black);
        letter-spacing: 0;
        line-height: 0.95;
        text-transform: none;
    }

    .stat-label span {
        display: block;
    }

    .stat-label span+span::before {
        content: none;
    }

    .stat-summary {
        grid-column: 2;
        grid-row: 1 / span 2;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: end;
    }

    .stat-select {
        grid-column: 3;
        grid-row: 1;
    }

    .stat-reset {
        grid-column: 3;
        grid-row: 2;
    }

    #progressPanel .stat-summary .key-progress-stat.is-primary strong {
        font-size: var(--font-size-base);
    }

    .key-progress-row {
        grid-template-columns: minmax(48px, 0.72fr) minmax(72px, 1fr) minmax(78px, 0.9fr);
        gap: var(--spacing-xs);
    }

    .key-progress-title {
        grid-template-columns: minmax(0, 1fr);
        justify-items: stretch;
    }

    .key-progress-title span {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .key-selected-chip {
        display: inline-block;
        justify-self: start;
        max-width: 100%;
        padding: 3px 5px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        font-size: 0.55rem;
    }

    .key-progress-actions {
        grid-template-columns: minmax(0, 1fr);
    }

    .key-progress-select,
    .key-progress-reset,
    .stat-select,
    .stat-reset {
        width: 100%;
        min-width: 0;
        min-height: clamp(26px, calc(16.4px + 3vw), 32px);
        padding: 0 var(--spacing-xxs);
        font-size: var(--font-size-xxs);
        white-space: nowrap;
    }

}

@media (max-height: 360px) {
    .screen-size-guard {
        opacity: 1;
        pointer-events: auto;
        visibility: visible;
    }
}

@media (orientation: portrait) {
    #content {
        align-items: stretch;
        justify-items: center;
        overflow: hidden;
    }

    #card {
        height: 100%;
        max-height: 100%;
        aspect-ratio: auto;
    }
}

@media (min-width: 700px) {
    .app-panel {
        top: var(--spacing-md);
        left: 50%;
        right: auto;
        bottom: var(--spacing-md);
        width: min(760px, calc(100% - var(--spacing-xl)));
        max-height: none;
        border: 0;
        border-radius: 16px;
        transform: translate(-50%, calc(100% + var(--spacing-xl)));
    }

    .app-panel.is-open {
        transform: translate(-50%, 0);
    }

}