:root {
    color-scheme: light;
    --bg: #eaf1fb;
    --bg-accent: #dbe8fb;
    --surface: #ffffff;
    --surface-soft: #f5f9ff;
    --text: #0f172a;
    --muted: #50607a;
    --line: #d3dfef;
    --primary: #1456d8;
    --primary-strong: #0b3fa8;
    --primary-soft: #e6eeff;
    --danger: #b42318;
    --danger-soft: #ffe8e5;
    --shadow: 0 12px 32px rgba(20, 40, 80, 0.12);
    --shadow-soft: 0 4px 14px rgba(20, 40, 80, 0.08);
    --radius-lg: 24px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --gap: clamp(8px, 1.2vw, 14px);
    --sentence-font: clamp(28px, 5.4vw, 54px);
    --button-font: clamp(20px, 3.2vw, 34px);
    --control-font: clamp(15px, 1.8vw, 20px);
    --font-scale: 1;
}

:root[data-font="large"] {
    --font-scale: 1.12;
}

:root[data-font="xlarge"] {
    --font-scale: 1.26;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #08101f;
    --bg-accent: #0d1930;
    --surface: #121d31;
    --surface-soft: #18253d;
    --text: #f3f7ff;
    --muted: #a9b8d2;
    --line: #2b3b57;
    --primary: #8db4ff;
    --primary-strong: #c6d8ff;
    --primary-soft: #1c3157;
    --danger: #ffb4ab;
    --danger-soft: #3b1613;
    --shadow: 0 14px 36px rgba(0, 0, 0, 0.42);
    --shadow-soft: 0 5px 16px rgba(0, 0, 0, 0.28);
}

:root[data-theme="contrast"] {
    color-scheme: dark;
    --bg: #000000;
    --bg-accent: #000000;
    --surface: #000000;
    --surface-soft: #000000;
    --text: #ffffff;
    --muted: #ffffff;
    --line: #ffffff;
    --primary: #ffd400;
    --primary-strong: #ffd400;
    --primary-soft: #000000;
    --danger: #ff8a80;
    --danger-soft: #000000;
    --shadow: none;
    --shadow-soft: none;
}

* {
    box-sizing: border-box;
}

svg[hidden] {
    display: none;
}

html,
body {
    height: 100%;
    margin: 0;
}

html {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
    background: var(--bg);
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--text);
    background:
        radial-gradient(circle at 12% 0%, var(--bg-accent) 0, transparent 38%),
        linear-gradient(160deg, var(--bg) 0%, var(--surface-soft) 100%);
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
}

button,
select,
input {
    font: inherit;
}

button {
    color: inherit;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 4px solid #ffbf00;
    outline-offset: 3px;
}

:root[data-theme="contrast"] button:focus-visible,
:root[data-theme="contrast"] select:focus-visible,
:root[data-theme="contrast"] input:focus-visible {
    outline-color: #ffffff;
}

.app {
    width: min(100%, 1180px);
    height: 100vh;
    height: 100dvh;
    margin: 0 auto;
    padding: max(10px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
    display: flex;
    flex-direction: column;
    gap: var(--gap);
}

.topbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px 16px;
    padding: 2px 2px 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1 1 260px;
}

.brand-mark {
    width: 48px;
    height: 48px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    color: #ffffff;
    background: linear-gradient(145deg, #2d7bff, #0b3fa8);
    border-radius: 15px;
    box-shadow: var(--shadow-soft);
}

.brand-mark svg {
    width: 29px;
    height: 29px;
}

.brand-copy {
    min-width: 0;
}

.brand-copy h1 {
    margin: 0;
    font-size: clamp(18px, 2.2vw, 26px);
    line-height: 1.15;
    letter-spacing: 0.01em;
}

.brand-copy p {
    margin: 3px 0 0;
    color: var(--muted);
    font-size: clamp(12px, 1.4vw, 15px);
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mode-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 999px;
    box-shadow: var(--shadow-soft);
    flex: 0 0 auto;
}

.mode-btn {
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--muted);
    padding: 11px 18px;
    font-size: clamp(14px, 1.6vw, 17px);
    font-weight: 800;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.mode-btn[aria-selected="true"] {
    background: var(--primary);
    color: #ffffff;
}

.top-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.icon-btn {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: background 0.18s ease, transform 0.18s ease;
}

.icon-btn:hover {
    background: var(--surface-soft);
}

.icon-btn:active {
    transform: scale(0.95);
}

.icon-btn svg {
    width: 23px;
    height: 23px;
}

.main {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: var(--gap);
}

.sentence-card {
    flex: 0 0 auto;
    min-height: clamp(120px, 18vh, 178px);
    display: flex;
    flex-direction: column;
    padding: clamp(12px, 1.5vw, 18px) clamp(14px, 2vw, 22px);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

:root[data-theme="contrast"] .sentence-card,
:root[data-theme="contrast"] .mode-switch,
:root[data-theme="contrast"] .icon-btn {
    border-width: 3px;
}

.path-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 34px;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex: 0 0 auto;
    min-height: 40px;
    padding: 6px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-soft);
    color: var(--text);
    font-size: clamp(13px, 1.4vw, 15px);
    font-weight: 700;
    cursor: pointer;
}

.back-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.back-btn svg {
    width: 18px;
    height: 18px;
}

.back-btn.is-scenario {
    border-color: var(--primary);
    background: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-soft);
}

:root[data-theme="dark"] .back-btn.is-scenario {
    color: #08101f;
}

:root[data-theme="contrast"] .back-btn.is-scenario {
    background: #ffd400;
    color: #000000;
    border-color: #ffd400;
    box-shadow: none;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 4px;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    color: var(--muted);
    font-size: clamp(13px, 1.4vw, 16px);
    font-weight: 700;
}

.crumb {
    overflow: hidden;
    text-overflow: ellipsis;
}

.crumb-sep {
    flex: 0 0 auto;
    opacity: 0.5;
}

.crumb.is-current {
    color: var(--text);
}

.page-indicator {
    flex: 0 0 auto;
    margin-left: auto;
    color: var(--muted);
    font-size: clamp(13px, 1.4vw, 15px);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.sentence-row {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    align-items: center;
    gap: clamp(10px, 1.6vw, 18px);
}

.sentence-text {
    flex: 1 1 auto;
    min-width: 0;
    max-height: 2.4em;
    margin: 0;
    overflow: hidden;
    color: var(--text);
    font-size: calc(var(--sentence-font) * var(--font-scale));
    font-weight: 850;
    line-height: 1.14;
    letter-spacing: 0.01em;
    text-align: left;
    overflow-wrap: anywhere;
}

.sentence-text.is-placeholder {
    color: var(--muted);
    font-weight: 750;
}

.sentence-actions {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.speak-btn {
    width: clamp(54px, 7vw, 70px);
    height: clamp(54px, 7vw, 70px);
    display: grid;
    place-items: center;
    border: 0;
    border-radius: 50%;
    background: linear-gradient(145deg, #2d7bff, #0b3fa8);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(20, 86, 216, 0.35);
    cursor: pointer;
    transition: transform 0.18s ease, filter 0.18s ease;
}

.speak-btn:hover {
    filter: brightness(1.08);
}

.speak-btn:active {
    transform: scale(0.94);
}

.speak-btn.is-speaking {
    background: linear-gradient(145deg, #c62828, #8f1d14);
    animation: pulse 1.2s ease-in-out infinite;
}

.speak-btn svg {
    width: 54%;
    height: 54%;
}

.favorite-btn {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--surface-soft);
    color: var(--muted);
    cursor: pointer;
}

.favorite-btn.is-favorite {
    color: #b45309;
    border-color: #f0b429;
    background: #fff7df;
}

:root[data-theme="dark"] .favorite-btn.is-favorite {
    background: #3a2a0b;
    color: #ffcf66;
    border-color: #8a6a1f;
}

.favorite-btn svg {
    width: 25px;
    height: 25px;
}

.hint-text {
    min-height: 20px;
    margin: 6px 0 0;
    color: var(--muted);
    font-size: clamp(12px, 1.35vw, 15px);
    font-weight: 650;
}

.board {
    flex: 1 1 auto;
    min-height: 0;
}

.button-grid {
    height: 100%;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-template-rows: repeat(3, minmax(0, 1fr));
    gap: var(--gap);
}

.grid-button {
    min-width: 0;
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(6px, 1vw, 14px);
    border: 3px solid var(--tone, var(--line));
    border-radius: var(--radius-md);
    background: var(--tone-soft, var(--surface));
    color: var(--tone-strong, var(--text));
    box-shadow: var(--shadow-soft);
    font-size: calc(var(--button-font) * var(--font-scale));
    font-weight: 850;
    line-height: 1.05;
    text-align: center;
    cursor: pointer;
    touch-action: manipulation;
    transition: transform 0.16s ease, box-shadow 0.16s ease, filter 0.16s ease;
}

.grid-button:hover:not(:disabled):not(.grid-empty) {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(20, 40, 80, 0.16);
    filter: brightness(1.02);
}

.grid-button:active:not(:disabled):not(.grid-empty) {
    transform: scale(0.98);
}

.grid-button:disabled {
    opacity: 0.38;
    cursor: not-allowed;
    filter: grayscale(0.25);
}

.grid-button.is-selected {
    background: var(--tone-strong, var(--primary));
    color: #ffffff;
    border-color: var(--tone-strong, var(--primary));
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.28);
}

.grid-button.grid-empty {
    border: 2px dashed var(--line);
    background: transparent;
    box-shadow: none;
    opacity: 0.28;
    cursor: default;
}

.btn-label {
    display: block;
    max-width: 100%;
    overflow-wrap: anywhere;
    pointer-events: none;
}

.function-btn {
    --tone: var(--line);
    --tone-soft: var(--surface);
    --tone-strong: var(--text);
    font-size: calc(var(--control-font) * var(--font-scale));
    letter-spacing: 0.02em;
}

.function-btn.clear {
    --tone: #e05252;
    --tone-soft: var(--danger-soft);
    --tone-strong: var(--danger);
}

.function-btn.page {
    --tone: #8fb4ee;
    --tone-soft: var(--primary-soft);
    --tone-strong: var(--primary-strong);
}

.footer {
    flex: 0 0 auto;
    display: flex;
    justify-content: center;
    gap: 10px;
    color: var(--muted);
    font-size: clamp(11px, 1.2vw, 13px);
    font-weight: 650;
    text-align: center;
}

.tone-danger,
.danger {
    --tone: #e05252;
    --tone-soft: #ffe8e5;
    --tone-strong: #8f1d14;
}

.tone-need,
.tone-person {
    --tone: #4b82e8;
    --tone-soft: #e8f0ff;
    --tone-strong: #123f9e;
}

.tone-warning {
    --tone: #e5a11a;
    --tone-soft: #fff6dc;
    --tone-strong: #7a4c00;
}

.tone-care,
.tone-cloth {
    --tone: #2aa79b;
    --tone-soft: #e5fbf8;
    --tone-strong: #075e56;
}

.tone-answer,
.tone-move {
    --tone: #3a9b5c;
    --tone-soft: #e8f9ed;
    --tone-strong: #14572c;
}

.tone-feeling {
    --tone: #d2578d;
    --tone-soft: #ffeaf3;
    --tone-strong: #80143f;
}

.tone-medical {
    --tone: #e05252;
    --tone-soft: #ffe8e5;
    --tone-strong: #8f1d14;
}

.tone-social,
.tone-custom {
    --tone: #7763d8;
    --tone-soft: #f0edff;
    --tone-strong: #3c2a9e;
}

.tone-food {
    --tone: #d9822b;
    --tone-soft: #fff3e4;
    --tone-strong: #7a3b05;
}

.tone-home {
    --tone: #4b82e8;
    --tone-soft: #e8f0ff;
    --tone-strong: #123f9e;
}

.tone-body {
    --tone: #a05ad6;
    --tone-soft: #f7ecff;
    --tone-strong: #591b8a;
}

.tone-daily {
    --tone: #7182a0;
    --tone-soft: #eef3fa;
    --tone-strong: #2d3d58;
}

:root[data-theme="dark"] .tone-danger,
:root[data-theme="dark"] .danger,
:root[data-theme="dark"] .tone-medical {
    --tone: #ff8a80;
    --tone-soft: #3a1512;
    --tone-strong: #ffc4be;
}

:root[data-theme="dark"] .tone-need,
:root[data-theme="dark"] .tone-person,
:root[data-theme="dark"] .tone-home {
    --tone: #7fa9ff;
    --tone-soft: #142648;
    --tone-strong: #c7d9ff;
}

:root[data-theme="dark"] .tone-warning {
    --tone: #ffc44d;
    --tone-soft: #3a2a0b;
    --tone-strong: #ffe0a3;
}

:root[data-theme="dark"] .tone-care,
:root[data-theme="dark"] .tone-cloth,
:root[data-theme="dark"] .tone-answer,
:root[data-theme="dark"] .tone-move {
    --tone: #5fd6bd;
    --tone-soft: #0e332d;
    --tone-strong: #b1fff0;
}

:root[data-theme="dark"] .tone-feeling {
    --tone: #ff9ec7;
    --tone-soft: #3a1830;
    --tone-strong: #ffd1e4;
}

:root[data-theme="dark"] .tone-social,
:root[data-theme="dark"] .tone-custom {
    --tone: #b9a8ff;
    --tone-soft: #261d4d;
    --tone-strong: #e4dcff;
}

:root[data-theme="dark"] .tone-food {
    --tone: #ffb46b;
    --tone-soft: #3a2410;
    --tone-strong: #ffd5ac;
}

:root[data-theme="dark"] .tone-body {
    --tone: #d5a0ff;
    --tone-soft: #2d1642;
    --tone-strong: #efd6ff;
}

:root[data-theme="dark"] .tone-daily {
    --tone: #aebbd1;
    --tone-soft: #1b2639;
    --tone-strong: #e3eaf6;
}

:root[data-theme="dark"] .grid-button.is-selected,
:root[data-theme="dark"] .mode-btn[aria-selected="true"],
:root[data-theme="dark"] .custom-add button {
    color: #08101f;
}

:root[data-theme="contrast"] .grid-button {
    --tone: #ffffff;
    --tone-soft: #000000;
    --tone-strong: #ffffff;
    border-width: 4px;
    box-shadow: none;
}

:root[data-theme="contrast"] .grid-button:hover,
:root[data-theme="contrast"] .grid-button.is-selected {
    background: #ffd400;
    color: #000000;
    border-color: #000000;
}

:root[data-theme="contrast"] .grid-button.function-btn.clear {
    --tone: #ff8a80;
    --tone-soft: #000000;
    --tone-strong: #ffb4ab;
}

:root[data-theme="contrast"] .grid-button.function-btn.page {
    --tone: #ffffff;
    --tone-soft: #000000;
    --tone-strong: #ffffff;
}

:root[data-theme="contrast"] .scenario-btn {
    --tone: #ffffff;
    --tone-soft: #000000;
    --tone-strong: #ffffff;
    border-color: #ffffff;
}

:root[data-theme="contrast"] .scenario-btn.is-current {
    background: #ffd400;
    color: #000000;
    border-color: #000000;
}

:root[data-theme="contrast"] .sentence-card,
:root[data-theme="contrast"] .mode-switch,
:root[data-theme="contrast"] .icon-btn,
:root[data-theme="contrast"] .back-btn,
:root[data-theme="contrast"] .favorite-btn {
    border-color: #ffffff;
}

:root[data-theme="contrast"] .speak-btn {
    background: #ffd400;
    color: #000000;
    box-shadow: none;
}

:root[data-theme="contrast"] .mode-btn[aria-selected="true"],
:root[data-theme="contrast"] .custom-add button {
    color: #000000;
}

.dialog {
    width: min(94vw, 720px);
    max-height: 90dvh;
    padding: 0;
    border: 0;
    border-radius: var(--radius-lg);
    background: transparent;
    color: var(--text);
}

.dialog::backdrop {
    background: rgba(6, 14, 28, 0.58);
    backdrop-filter: blur(4px);
}

.dialog-card {
    max-height: 90dvh;
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

:root[data-theme="contrast"] .dialog-card {
    border-width: 3px;
}

.dialog-head {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    border-bottom: 1px solid var(--line);
}

.dialog-head h2 {
    margin: 0;
    font-size: clamp(20px, 2.4vw, 26px);
}

.dialog-close {
    margin-left: auto;
    box-shadow: none;
}

.dialog-body {
    flex: 1 1 auto;
    padding: 18px 20px 24px;
    overflow: auto;
    overscroll-behavior: contain;
}

.setting-group {
    margin: 0 0 22px;
    padding: 0 0 20px;
    border-bottom: 1px solid var(--line);
}

.setting-group:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 0;
}

.setting-group h3 {
    margin: 0 0 12px;
    font-size: clamp(16px, 1.8vw, 19px);
}

.field {
    display: grid;
    gap: 7px;
    margin-bottom: 12px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 700;
}

.field:last-child {
    margin-bottom: 0;
}

.field select,
.field input[type="text"],
.custom-add input {
    width: 100%;
    min-height: 44px;
    padding: 9px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-soft);
    color: var(--text);
    font-size: 16px;
}

.field input[type="range"] {
    width: 100%;
    min-height: 32px;
    accent-color: var(--primary);
}

.field output {
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.switch {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 42px;
    margin-bottom: 8px;
    color: var(--text);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
}

.switch input {
    width: 24px;
    height: 24px;
    flex: 0 0 auto;
    accent-color: var(--primary);
}

.note {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.55;
}

.secondary-btn {
    min-height: 44px;
    margin: 4px 8px 4px 0;
    padding: 8px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-soft);
    color: var(--text);
    font-size: 15px;
    font-weight: 750;
    cursor: pointer;
}

.secondary-btn:hover {
    background: var(--primary-soft);
}

.secondary-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.danger-text {
    color: var(--danger);
    border-color: var(--danger);
}

.custom-add {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.custom-add input {
    flex: 1 1 auto;
    min-width: 0;
}

.custom-add button {
    flex: 0 0 auto;
    min-width: 76px;
    border: 0;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    cursor: pointer;
}

.custom-list,
.history-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 8px;
}

.scenario-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.scenario-btn {
    min-height: 82px;
    padding: 12px 14px;
    border: 3px solid var(--tone, var(--line));
    border-radius: var(--radius-sm);
    background: var(--tone-soft, var(--surface-soft));
    color: var(--tone-strong, var(--text));
    text-align: left;
    cursor: pointer;
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.scenario-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.scenario-btn.is-current {
    box-shadow: inset 0 0 0 3px var(--tone-strong, var(--text));
}

.scenario-top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
}

.scenario-title {
    font-size: clamp(16px, 1.8vw, 19px);
    font-weight: 850;
}

.scenario-count {
    flex: 0 0 auto;
    color: inherit;
    font-size: 12px;
    font-weight: 700;
    opacity: 0.72;
}

.scenario-preview {
    display: block;
    margin-top: 6px;
    color: inherit;
    font-size: 12px;
    font-weight: 650;
    line-height: 1.45;
    opacity: 0.78;
}

@media (min-width: 640px) {
    .scenario-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

.custom-item,
.history-item {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 46px;
    padding: 6px 8px 6px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-soft);
}

.custom-text,
.history-text {
    flex: 1 1 auto;
    min-width: 0;
    overflow-wrap: anywhere;
    font-size: 15px;
    font-weight: 700;
}

.history-item {
    padding: 0;
}

.history-play {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    border: 0;
    background: transparent;
    color: var(--text);
    text-align: left;
    cursor: pointer;
}

.history-time {
    flex: 0 0 auto;
    color: var(--muted);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}

.custom-remove {
    flex: 0 0 auto;
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--surface);
    color: var(--danger);
    font-size: 18px;
    cursor: pointer;
}

.empty-state {
    margin: 0;
    padding: 18px;
    border: 1px dashed var(--line);
    border-radius: var(--radius-sm);
    color: var(--muted);
    text-align: center;
    font-size: 14px;
}

.help-section {
    margin-bottom: 18px;
}

.help-section h3 {
    margin: 0 0 8px;
    font-size: 17px;
}

.help-section p,
.help-section li {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.65;
}

.help-section ul {
    margin: 8px 0 0;
    padding-left: 20px;
}

kbd {
    display: inline-block;
    min-width: 24px;
    padding: 1px 6px;
    border: 1px solid var(--line);
    border-bottom-width: 3px;
    border-radius: 6px;
    background: var(--surface-soft);
    color: var(--text);
    font-family: inherit;
    font-size: 12px;
    font-weight: 800;
    text-align: center;
}

.toast {
    position: fixed;
    left: 50%;
    bottom: max(18px, env(safe-area-inset-bottom));
    z-index: 30;
    max-width: min(90vw, 460px);
    padding: 11px 18px;
    border-radius: 999px;
    background: rgba(12, 22, 40, 0.92);
    color: #ffffff;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
    font-size: 14px;
    font-weight: 700;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 12px);
    transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.is-visible {
    opacity: 1;
    transform: translate(-50%, 0);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@keyframes pulse {
    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(180, 35, 24, 0.35);
    }
    50% {
        box-shadow: 0 0 0 12px rgba(180, 35, 24, 0);
    }
}

@media (max-width: 760px) {
    .topbar {
        gap: 8px;
    }

    .brand {
        flex: 1 1 auto;
    }

    .brand-copy p {
        display: none;
    }

    .mode-switch {
        order: 3;
        flex: 1 0 100%;
    }

    .mode-btn {
        flex: 1 1 50%;
        padding: 10px 12px;
    }

    .top-actions {
        gap: 6px;
    }

    .icon-btn {
        width: 44px;
        height: 44px;
    }

    .sentence-card {
        min-height: 116px;
    }

    .sentence-text {
        max-height: 2.6em;
    }

    .favorite-btn {
        width: 44px;
        height: 44px;
    }

    .footer span:nth-child(2) {
        display: none;
    }
}

@media (max-height: 680px) {
    .app {
        gap: 7px;
    }

    .brand-mark {
        width: 40px;
        height: 40px;
        border-radius: 12px;
    }

    .brand-copy h1 {
        font-size: 18px;
    }

    .sentence-card {
        min-height: 100px;
        padding-top: 8px;
        padding-bottom: 8px;
    }

    .hint-text {
        margin-top: 2px;
    }

    .footer {
        display: none;
    }
}

@media (orientation: landscape) and (max-height: 560px) {
    .app {
        gap: 6px;
        padding-top: 6px;
        padding-bottom: 6px;
    }

    .topbar {
        gap: 8px;
    }

    .brand-copy p,
    .hint-text {
        display: none;
    }

    .sentence-card {
        min-height: 86px;
        gap: 2px;
        padding: 6px 10px;
    }

    .path-bar {
        min-height: 26px;
    }

    .back-btn {
        min-height: 28px;
        padding: 2px 8px;
    }

    .breadcrumb {
        font-size: 12px;
    }

    .sentence-row {
        gap: 10px;
    }

    .sentence-text {
        max-height: 1.8em;
        font-size: calc(clamp(22px, 4.8vh, 38px) * var(--font-scale));
    }

    .speak-btn {
        width: 48px;
        height: 48px;
    }

    .favorite-btn {
        display: none;
    }

    .button-grid {
        gap: 6px;
    }

    .grid-button {
        min-height: 46px;
        border-width: 2px;
        border-radius: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}