:root {
    color-scheme: light;
    --control-border: #cad7e3;
    --muted-bg: #f4f0ec;
    --muted-text: #4d423b;
    --muted-border: #d9cbc0;
    --success-text: #1d7d43;
    --on-accent: #f7fffe;
    --card-bg: linear-gradient(135deg, #ffffff, #f6fcff 58%, #edf8f6);
    --bg-main: radial-gradient(circle at 8% 0%, #fff9ec 0%, #f3f8ff 45%, #eef7f2 100%);
    --panel-bg: rgba(255, 255, 255, 0.84);
    --panel-border: rgba(31, 58, 93, 0.12);
    --panel-shadow: 0 20px 40px rgba(17, 37, 59, 0.08);
    --text-primary: #14243a;
    --text-secondary: #4f6278;
    --accent: #0f847a;
    --accent-strong: #0b665f;
    --danger-bg: #fff0ef;
    --danger-border: #eb8f87;
    --danger-text: #a7332d;
    --chip-bg: #ebf7f6;
    --chip-border: #9accc7;
    --surface-solid: #ffffff;
    --surface-soft: #f5f8fa;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg-main: radial-gradient(circle at 8% 0%, #242a30 0%, #171e27 45%, #182723 100%);
    --panel-bg: #222c35;
    --panel-border: #41505d;
    --panel-shadow: 0 20px 40px rgba(0, 0, 0, 0.18);
    --text-primary: #e5e7e6;
    --text-secondary: #b3bfc8;
    --accent: #78c9bc;
    --accent-strong: #9bded2;
    --on-accent: #152e2a;
    --danger-bg: #442d30;
    --danger-border: #aa696b;
    --danger-text: #ffb4aa;
    --chip-bg: #263f3b;
    --chip-border: #547e75;
    --surface-solid: #1c252e;
    --surface-soft: #2c3843;
    --control-border: #617381;
    --muted-bg: #39352f;
    --muted-text: #e0cbb3;
    --muted-border: #7e7060;
    --success-text: #9bd6aa;
    --card-bg: linear-gradient(135deg, #2e3a45, #26363b 58%, #293e39);
}

.header-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.text-input::placeholder {
    color: var(--text-secondary);
    opacity: 1;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg-main);
    color: var(--text-primary);
    font-family: "Manrope", "Segoe UI", sans-serif;
}

#root {
    padding: 24px 16px 56px;
}

.app-shell {
    width: min(1040px, 100%);
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.app-header {
    margin: 12px 0 8px;
    animation: rise-in 420ms ease-out;
}

.app-title {
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25em;
    font-family: "Fraunces", Georgia, serif;
    font-size: clamp(2rem, 4.8vw, 3.25rem);
    letter-spacing: 0.01em;
}

.app-title > span {
    min-width: 0;
    text-wrap: balance;
}

.app-logo {
    display: block;
    flex-shrink: 0;
    height: 1.15em;
    width: auto;
    object-fit: contain;
}

.app-subtitle {
    margin: 12px auto 0;
    width: min(680px, 100%);
    color: var(--text-secondary);
    font-size: 0.98rem;
    line-height: 1.45;
}

.panel,
.known-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 18px;
    padding: 18px;
    box-shadow: var(--panel-shadow);
    backdrop-filter: blur(6px);
    animation: rise-in 500ms ease-out;
}

.panel-title {
    margin: 0;
    font-family: "Fraunces", Georgia, serif;
    font-size: 1.25rem;
}

.panel-content {
    margin-top: 14px;
}

.input-label {
    font-size: 0.84rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.panel-actions {
    margin-top: 14px;
}

.action-section {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--panel-border);
}

.action-title {
    margin: 0 0 12px 0;
    font-size: 0.84rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.action-button-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.action-description {
    margin: 10px 0 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.backup-status,
.import-status,
.export-status {
    margin: 10px 0 0;
    color: var(--accent-strong);
    font-weight: 600;
}

.backup-status.is-error,
.import-status.is-error,
.export-status.is-error {
    color: var(--danger-text);
}

.wordsets-panel {
    position: relative;
    z-index: 1;
    text-align: left;
    padding: 24px;
}

.wordsets-panel .panel-title {
    font-size: 1.5rem;
}

.wordsets-header, .wordset-active-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}
.wordsets-subtitle, .wordset-card-count, .wordset-next-step p,
.wordset-start-option p, .wordset-ready p, .wordset-select-prompt p {
    margin: 6px 0 0;
    color: var(--text-secondary);
    font-size: 0.86rem;
    line-height: 1.6;
}
.wordsets-header > .btn {
    flex-shrink: 0;
    white-space: nowrap;
}

.wordset-create {
    margin-top: 22px;
    padding: 20px;
    background: var(--chip-bg);
    border: 1px solid var(--chip-border);
    border-radius: 14px;
}
.wordset-next-step, .wordset-ready {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}
.wordset-next-step {
    margin-bottom: 18px;
}

.wordset-next-step h4, .wordset-ready h4, .wordset-select-prompt h4 {
    margin: 0;
    font-size: 1rem;
    line-height: 1.5;
}
.wordset-step-number, .wordset-ready-icon {
    display: grid;
    place-items: center;
    flex: 0 0 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--on-accent);
    font-size: 0.82rem;
    font-weight: 700;
}
.wordset-create-actions, .wordset-backup-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 8px;
}
.wordset-create-actions .text-input {
    flex: 1 1 200px;
    min-width: 0;
    width: auto;
}

.wordset-name-feedback, .wordset-import-note {
    margin: 8px 0 0;
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.6;
}
.wordset-name-feedback.is-error {
    color: var(--danger-text);
}

.wordsets-panel .btn {
    min-height: 42px;
}

.wordsets-panel .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}
.wordsets-panel .btn:focus-visible, .dataset-btn:focus-visible,
.wordsets-panel summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}
.wordset-text-button {
    background: transparent;
    color: var(--text-secondary);
}

.wordset-text-button:hover {
    background: var(--surface-soft);
    color: var(--text-primary);
}

.wordsets-layout {
    display: grid;
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    gap: 24px;
    margin-top: 24px;
}
.wordset-library {
    min-width: 0;
    padding-right: 20px;
    border-right: 1px solid var(--panel-border);
}

.wordset-section-label {
    margin: 0 0 12px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.dataset-list {
    display: grid;
    gap: 6px;
    max-height: 340px;
    overflow-y: auto;
    padding: 4px;
    margin: -4px;
}

.dataset-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    min-height: 64px;
    padding: 12px;
    border: 1px solid transparent;
    border-radius: 12px;
    background: transparent;
    color: var(--text-primary);
    text-align: left;
    font: inherit;
    cursor: pointer;
    transition: background-color 160ms ease, border-color 160ms ease;
}
.dataset-btn:hover {
    background: var(--surface-soft);
}

.dataset-btn.is-selected {
    border-color: var(--chip-border);
    background: var(--chip-bg);
    color: var(--accent-strong);
}

.wordset-selection-dot {
    display: grid;
    place-items: center;
    flex: 0 0 20px;
    height: 20px;
    font-weight: 700;
}

.dataset-btn.is-selected .wordset-selection-dot {
    border-radius: 50%;
    background: var(--accent);
    color: var(--on-accent);
    font-size: 0.7rem;
}

.wordset-list-label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.wordset-list-name {
    font-size: 0.87rem;
    font-weight: 700;
    overflow-wrap: anywhere;
}

.wordset-list-count {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.wordset-workspace {
    min-width: 0;
}

.wordset-active-heading {
    min-width: 0;
}

.wordset-active-heading .wordset-section-label {
    margin-bottom: 5px;
}

.wordset-active-heading h4 {
    margin: 0;
    font-size: 1.35rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.wordset-onboarding {
    margin-top: 24px;
}

.wordset-start-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.wordset-start-option {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 18px;
    border: 1px solid var(--panel-border);
    border-radius: 14px;
    background: var(--surface-solid);
}
.wordset-start-option.is-recommended {
    background: var(--chip-bg);
    border-color: var(--chip-border);
}

.wordset-option-icon {
    color: var(--accent-strong);
    font-size: 1.6rem;
    line-height: 1;
    margin-bottom: 14px;
}

.wordset-start-option h5 {
    margin: 0;
    font-size: 1rem;
}

.wordset-start-option p {
    margin-bottom: 20px;
}

.wordset-start-option .btn {
    margin-top: auto;
    width: 100%;
}

.wordset-file-guide {
    margin-top: 16px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.7;
}

.wordset-file-guide summary {
    cursor: pointer;
    width: fit-content;
}

.wordset-file-guide p {
    margin: 12px 0;
}

.wordset-column-guide {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding: 0;
    list-style-position: inside;
}

.wordset-column-guide li {
    padding: 10px;
    background: var(--surface-soft);
    border-radius: 8px;
}

.wordset-column-guide strong {
    color: var(--text-primary);
    font-size: 0.75rem;
}

.wordset-column-guide span {
    display: block;
    font-size: 0.72rem;
}

.wordset-workspace-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
}

.wordset-workspace-actions .wordset-import-note {
    flex-basis: 100%;
    margin: 0;
    order: 3;
}

.wordset-ready {
    margin-top: 24px;
    padding: 18px;
    background: var(--surface-soft);
    border-radius: 12px;
}

.wordset-ready-icon {
    background: var(--chip-bg);
    color: var(--accent-strong);
}

.wordset-menu {
    position: relative;
    flex-shrink: 0;
}

.wordset-menu-trigger {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 42px;
    padding: 8px 12px;
    color: var(--text-secondary);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
}
.wordset-menu-trigger::-webkit-details-marker {
    display: none;
}

.wordset-menu-trigger::after {
    content: "⌄";
}

.wordset-menu[open] > .wordset-menu-trigger {
    background: var(--surface-soft);
}

.wordset-menu-content {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    z-index: 3;
    display: grid;
    gap: 6px;
    width: 200px;
    padding: 8px;
    background: var(--surface-solid);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    box-shadow: var(--panel-shadow);
}
.wordset-menu-content .btn {
    text-align: left;
}

.wordset-export-menu .wordset-menu-content {
    left: 0;
    right: auto;
}

.wordset-rename {
    margin-top: 18px;
    padding: 14px;
    border-radius: 12px;
    background: var(--surface-soft);
}

.wordset-select-prompt {
    padding: 34px 12px;
    text-align: center;
}

.wordset-select-prompt > span {
    display: block;
    font-size: 1.8rem;
    color: var(--accent);
    margin-bottom: 12px;
}

.wordset-backup {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--panel-border);
}

.wordset-backup summary {
    width: fit-content;
    cursor: pointer;
    font-size: 0.83rem;
    font-weight: 600;
}

.wordset-backup summary > span {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.76rem;
    margin-left: 12px;
}

.wordset-backup-content {
    margin-top: 14px;
}

.wordset-backup-content > p:first-child {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}


.toolbar-actions,
.flashcard-actions,
.form-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.form-actions,
.flashcard-actions,
.toolbar-actions {
    margin-top: 12px;
}

.unknown-panel {
    padding-bottom: 22px;
}

.study-panel-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

body:has(.study-expanded) {
    overflow: hidden;
}

.unknown-panel.study-expanded {
    position: fixed;
    inset: 0;
    z-index: 1000;
    width: 100%;
    height: 100%;
    height: 100dvh;
    margin: 0;
    padding: clamp(16px, 3vw, 40px);
    padding-bottom: max(22px, env(safe-area-inset-bottom));
    border: 0;
    border-radius: 0;
    background: var(--bg-main);
    overflow-y: auto;
    overscroll-behavior: contain;
    display: flex;
    flex-direction: column;
    text-align: center;
    animation: none;
}

.study-expanded .flashcard {
    flex: 1 0 auto;
    width: min(100%, 1100px);
    min-height: 35vh;
    font-size: clamp(2.5rem, 7vw, 6rem);
}

.study-expanded .example-sentence,
.study-expanded .exercise-controls {
    width: min(100%, 800px);
}

.study-expanded .flashcard-actions {
    margin-top: 20px;
}

.unknown-meta {
    margin-top: 8px;
}

.known-actions-group {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.field-row {
    margin-bottom: 12px;
}

.text-input,
.file-input {
    width: min(360px, 100%);
    padding: 0.65rem 0.78rem;
    border-radius: 10px;
    border: 1px solid var(--control-border);
    background: var(--surface-solid);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
}

.text-input:focus,
.file-input:focus {
    outline: 2px solid rgba(15, 132, 122, 0.25);
    border-color: var(--accent);
}

.file-input {
    display: inline-block;
}

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

.btn {
    border: 1px solid transparent;
    border-radius: 11px;
    padding: 0.58rem 0.92rem;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    transition: transform 140ms ease, box-shadow 160ms ease, background-color 180ms ease;
}

.btn-small {
    padding: 0.38rem 0.62rem;
    font-size: 0.82rem;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--accent);
    color: var(--on-accent);
    box-shadow: 0 10px 18px rgba(11, 102, 95, 0.22);
}

.btn-primary:hover {
    background: var(--accent-strong);
}

.btn-secondary {
    background: var(--surface-soft);
    color: var(--text-primary);
    border-color: var(--control-border);
}

.btn-muted {
    background: var(--muted-bg);
    color: var(--muted-text);
    border-color: var(--muted-border);
}

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

.status-chip {
    margin: 6px auto 0;
    display: inline-block;
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--chip-border);
    background: var(--chip-bg);
    font-weight: 700;
}

.status-badge-known {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    border: 1px solid var(--chip-border);
    background: var(--chip-bg);
    color: var(--accent-strong);
    font-size: 0.78rem;
    font-weight: 700;
    white-space: nowrap;
}

.status-badge-unknown {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    border: 1px solid var(--muted-border);
    background: var(--muted-bg);
    color: var(--muted-text);
    font-size: 0.78rem;
    font-weight: 700;
    white-space: nowrap;
}

.position-counter {
    margin: 6px 0 4px;
    color: var(--text-secondary);
    font-weight: 600;
}

.flashcard {
    margin: 20px auto 8px;
    width: min(88vw, 500px);
    min-height: 210px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 18px;
    border: 1px solid rgba(21, 73, 119, 0.15);
    background: var(--imported-background, var(--card-bg));
    color: var(--imported-text-color, inherit);
    box-shadow: 0 24px 42px rgba(12, 51, 87, 0.12);
    font-family: "Fraunces", Georgia, serif;
    font-size: clamp(2rem, 7vw, 3.25rem);
    line-height: 1.15;
    cursor: pointer;
    user-select: none;
    padding: 22px;
}

.flashcard:hover {
    box-shadow: 0 28px 46px rgba(12, 51, 87, 0.18);
}

.flashcard-text {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    min-width: 0;
}

.colored-text {
    color: var(--imported-text-color, inherit);
}

.colored-cell {
    color: var(--imported-text-color, inherit);
    background: var(--imported-background, transparent);
}

.example-sentence {
    width: min(100%, 500px);
    margin: 12px auto;
    padding: 12px 16px;
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    background: var(--imported-background, var(--chip-bg));
    text-align: left;
}

.example-sentence summary {
    color: var(--imported-text-color, var(--accent-strong));
    cursor: pointer;
    font-weight: 600;
}

.example-sentence summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

.example-sentence-text {
    color: var(--imported-text-color, inherit);
    margin: 12px 0 0;
    line-height: 1.6;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.example-sentence-input {
    font-family: inherit;
    resize: vertical;
}

.flashcard.is-correct {
    border-color: rgba(36, 145, 79, 0.45);
    box-shadow: 0 24px 42px rgba(24, 118, 62, 0.22);
}

.flashcard.is-incorrect {
    border-color: rgba(186, 60, 45, 0.5);
    box-shadow: 0 24px 42px rgba(138, 47, 36, 0.2);
}

.exercise-controls {
    margin: 10px auto 0;
    width: min(88vw, 500px);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.exercise-answer-input {
    width: 100%;
}

.exercise-feedback {
    margin: 0;
    font-weight: 700;
}

.exercise-feedback.is-correct {
    color: var(--success-text);
}

.exercise-feedback.is-incorrect {
    color: var(--danger-text);
}

.exercise-pinyin {
    margin: 0;
    color: var(--text-secondary);
    font-weight: 600;
}

.empty-note,
.muted-note {
    color: var(--text-secondary);
}

.known-title {
    margin: 0;
}

.known-summary {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    cursor: pointer;
    list-style: none;
    text-align: left;
}

.known-summary::-webkit-details-marker {
    display: none;
}

.known-summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    border-radius: 4px;
}

.known-summary .known-counter {
    margin: 0;
}

.known-chevron {
    margin-left: auto;
    font-size: 1.5rem;
    line-height: 1;
    color: var(--text-secondary);
}

.known-panel[open] .known-chevron {
    transform: rotate(90deg);
}

.known-panel {
    margin-bottom: 24px;
}

.known-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.known-table th,
.known-table td {
    padding: 10px 8px;
    border-bottom: 1px solid var(--panel-border);
}

.known-table th:last-child,
.known-table td:last-child {
    text-align: center;
}

.known-table th {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
}

@keyframes rise-in {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 720px) {
    #root {
        padding: 14px 10px 30px;
    }

    .panel,
    .known-panel {
        padding: 12px;
    }

    .toolbar-actions .btn,
    .flashcard-actions .btn,
    .form-actions .btn {
        width: min(100%, 320px);
    }

    .text-input,
    .file-input {
        width: min(100%, 420px);
    }

    .wordsets-panel {
        padding: 18px;
    }

    .wordsets-layout {
        grid-template-columns: minmax(0, 1fr);
        gap: 24px;
    }

    .wordset-library {
        padding: 0 0 18px;
        border-right: 0;
        border-bottom: 1px solid var(--panel-border);
    }

    .dataset-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        max-height: 200px;
    }

    .wordset-create {
        padding: 16px;
    }

    .wordset-create-actions .text-input {
        flex-basis: 100%;
        width: 100%;
    }

    .wordset-create-actions > .btn-primary {
        flex: 1;
    }

    .wordset-backup summary > span {
        display: block;
        margin: 6px 0 0 16px;
    }


    .app-subtitle {
        font-size: 0.9rem;
    }

    .known-table {
        display: block;
        overflow-x: auto;
    }
}

/* ── Help modal ─────────────────────────────────────────── */

.help-backdrop {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(20, 36, 58, 0.45);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 32px 16px 40px;
    overflow-y: auto;
    animation: rise-in 220ms ease-out;
}

.help-modal {
    width: min(720px, 100%);
    text-align: left;
    animation: rise-in 280ms ease-out;
}

.help-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.help-modal-title {
    font-size: 1.4rem;
}

.help-close-btn {
    flex-shrink: 0;
}

/* ── Footer ─────────────────────────────────────────────── */

.app-footer {
    margin-top: 8px;
    padding-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.app-footer a {
    color: var(--accent);
    text-decoration: none;
}

.app-footer a:hover {
    text-decoration: underline;
}

.help-body {
    margin-top: 18px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.help-section {
    padding: 4px 0 8px;
}

.help-section-title {
    margin: 0 0 10px;
    font-family: "Fraunces", Georgia, serif;
    font-size: 1.1rem;
    color: var(--accent-strong);
}

.help-divider {
    border: none;
    border-top: 1px solid var(--panel-border);
    margin: 14px 0;
}

.help-text {
    margin: 6px 0;
    color: var(--text-primary);
    line-height: 1.55;
    font-size: 0.95rem;
}

.help-text-muted {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.help-list {
    margin: 8px 0 8px 20px;
    padding: 0;
    line-height: 1.7;
    font-size: 0.93rem;
}

.help-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 18px;
}

.help-step-number {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--on-accent);
    font-weight: 700;
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
}

.csv-format-block {
    background: var(--surface-soft);
    border: 1px solid var(--control-border);
    border-radius: 8px;
    padding: 8px 14px;
    margin: 8px 0;
    font-size: 0.88rem;
    overflow-x: auto;
}

@media (min-width: 721px) and (max-width: 860px) {
    .wordsets-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .wordset-library {
        padding: 0 0 18px;
        border-right: 0;
        border-bottom: 1px solid var(--panel-border);
    }

    .dataset-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        max-height: 200px;
    }

}

@media (max-width: 480px) {
    .wordsets-header {
        flex-direction: column;
    }

    .wordsets-header > .btn {
        width: 100%;
    }

    .dataset-list {
        grid-template-columns: minmax(0, 1fr);
    }

    .wordset-start-options {
        grid-template-columns: minmax(0, 1fr);
    }

    .wordset-column-guide {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .wordset-active-header {
        gap: 10px;
    }

    .wordset-create-actions {
        align-items: stretch;
    }

    .wordset-backup-actions {
        align-items: stretch;
        flex-direction: column;
    }

}