/* Shared design tokens are defined in tokens.css. */

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html {
    background: var(--page);
}

body {
    min-width: 320px;
    min-height: 100vh;
    margin: 0;
    background: var(--page);
    color: var(--ink);
    font-family: var(--font);
    font-size: 15px;
    letter-spacing: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    color: inherit;
    font: inherit;
    letter-spacing: 0;
}

button,
summary,
select,
label {
    -webkit-tap-highlight-color: transparent;
}

button,
select,
summary,
input[type="checkbox"],
input[type="radio"] + span {
    cursor: pointer;
}

.app-shell {
    width: min(1280px, 100%);
    min-height: 100vh;
    margin: 0 auto;
    padding: 0 28px 48px;
}

.topbar {
    position: relative;
    z-index: 5;
    display: flex;
    min-height: 88px;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    border-bottom: 1px solid var(--line);
}

.nav-tabs {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--surface-muted);
    padding: 4px;
    border-radius: 9999px;
    border: 1px solid var(--line);
}

.nav-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 16px;
    font-size: 13.5px;
    font-weight: 650;
    color: var(--muted);
    text-decoration: none;
    border-radius: 9999px;
    transition: all 0.15s ease;
    user-select: none;
}

.nav-tab:visited {
    color: var(--muted);
}

.nav-tab i,
.nav-tab svg {
    width: 16px;
    height: 16px;
    stroke-width: 2.2;
}

.nav-tab:hover {
    color: var(--ink);
    background: var(--surface-muted);
}

.nav-tab.active,
.nav-tab.active:visited {
    color: var(--primary);
    background: var(--surface);
    box-shadow: 0 1px 4px rgba(28, 40, 33, 0.12);
}

.brand-block,
.brand-block > div:last-child,
.panel-heading > div,
.audio-heading-row > div:first-child {
    min-width: 0;
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-mark {
    display: grid;
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    place-items: center;
    border: 1px solid var(--primary);
    border-radius: 8px;
    background: var(--primary-soft);
    color: var(--primary);
}

.brand-mark svg {
    width: 21px;
    height: 21px;
}

.product-label {
    margin: 0 0 3px;
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    line-height: 1;
}

h1,
h2,
p {
    letter-spacing: 0;
}

h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 720;
    line-height: 1.2;
}

h2 {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.3;
}

.connection-settings {
    position: relative;
    flex: 0 0 auto;
}

.connection-settings summary {
    display: flex;
    height: 40px;
    list-style: none;
    align-items: center;
    gap: 8px;
    border: 1px solid var(--line-strong);
    border-radius: 7px;
    background: var(--surface);
    padding: 0 12px;
    color: var(--ink);
    font-size: 14px;
    font-weight: 650;
}

.connection-summary-state {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
}

.connection-dot {
    width: 8px;
    height: 8px;
    flex: 0 0 8px;
    border-radius: 50%;
    background: var(--line-strong);
}

.connection-summary-state[data-state="testing"],
.connection-result[data-state="testing"] {
    color: var(--primary);
}

.connection-summary-state[data-state="testing"] .connection-dot,
.connection-result[data-state="testing"] > .connection-dot {
    background: var(--primary);
}

.connection-summary-state[data-state="connected"],
.connection-result[data-state="connected"] {
    color: var(--success);
}

.connection-summary-state[data-state="connected"] .connection-dot,
.connection-result[data-state="connected"] > .connection-dot {
    background: var(--success);
}

.connection-summary-state[data-state="error"],
.connection-result[data-state="error"] {
    color: var(--danger);
}

.connection-summary-state[data-state="error"] .connection-dot,
.connection-result[data-state="error"] > .connection-dot {
    background: var(--danger);
}

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

.connection-settings summary svg {
    width: 17px;
    height: 17px;
}

.connection-settings[open] summary {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.12);
}

.summary-chevron {
    margin-left: 2px;
    transition: transform 160ms ease;
}

.connection-settings[open] .summary-chevron {
    transform: rotate(180deg);
}

.connection-popover {
    position: absolute;
    top: 48px;
    right: 0;
    width: min(430px, calc(100vw - 40px));
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow);
    padding: 16px;
}

.connection-field > label,
.control-group > label,
.control-group legend {
    display: block;
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
    line-height: 1.2;
}

.connection-popover select {
    height: 38px;
    background-position: calc(100% - 15px) 16px, calc(100% - 10px) 16px;
}

input[type="password"],
input[type="text"] {
    width: 100%;
    height: 38px;
    min-width: 0;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background: var(--surface);
    padding: 0 10px;
    outline: none;
}

input[type="password"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.12);
}

.connection-test-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    align-items: center;
    margin-top: 14px;
    border-top: 1px solid var(--line);
    padding-top: 14px;
}

.connection-result {
    display: flex;
    min-width: 0;
    align-items: flex-start;
    gap: 8px;
    color: var(--muted);
}

.connection-result > .connection-dot {
    margin-top: 5px;
}

.connection-result div {
    min-width: 0;
}

.connection-result strong,
.connection-result span:last-child {
    display: block;
    overflow-wrap: anywhere;
}

.connection-result strong {
    margin-bottom: 2px;
    font-size: 12px;
    line-height: 1.25;
}

.connection-result span:last-child {
    color: var(--muted);
    font-size: 11px;
    line-height: 1.35;
}

.btn-test {
    min-height: 38px;
    border-color: var(--line-strong);
    background: var(--surface);
    color: var(--ink);
    padding: 0 12px;
}

.btn-test:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
}

main {
    padding-top: 24px;
}

.task-mode-band {
    margin-bottom: 18px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 16px;
}

.segmented-control.task-segments {
    width: min(780px, 100%);
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.editor-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 18px;
}

.editor-panel {
    display: flex;
    min-width: 0;
    height: 380px;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
}

.output-panel {
    border-top-color: var(--accent);
}

.panel-heading {
    display: flex;
    min-height: 52px;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid var(--line);
    padding: 0 14px;
}

.panel-heading > div:first-child,
.audio-heading-row > div:first-child {
    display: flex;
    align-items: center;
    gap: 9px;
}

.step-number {
    display: inline-flex;
    min-width: 24px;
    color: var(--primary);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
    font-weight: 800;
}

.panel-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.model-used {
    max-width: 260px;
    overflow: hidden;
    border: 1px solid var(--accent-line);
    border-radius: 999px;
    background: var(--accent-soft);
    padding: 3px 8px;
    color: var(--accent);
    font-size: 11px;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.task-used {
    max-width: 150px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-muted);
    padding: 3px 8px;
    color: var(--muted);
    font-size: 11px;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.task-used[data-state="resolved"] {
    border-color: var(--success-line);
    background: var(--success-soft);
    color: var(--success);
}

.task-used[data-state="failed"] {
    border-color: var(--danger-line);
    background: var(--danger-soft);
    color: var(--danger);
}

.model-used[data-quality="passed"],
.model-used[data-quality="proofread"] {
    border-color: var(--success-line);
    background: var(--success-soft);
    color: var(--success);
}

.model-used[data-quality="failed"] {
    border-color: var(--danger-line);
    background: var(--danger-soft);
    color: var(--danger);
}

.icon-btn {
    display: inline-grid;
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface);
    color: var(--muted);
    padding: 0;
}

.panel-heading .icon-btn {
    width: 34px;
    height: 34px;
    flex-basis: 34px;
}

.icon-btn:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
}

.icon-btn svg {
    width: 17px;
    height: 17px;
}

.editor-panel textarea {
    width: 100%;
    min-height: 0;
    flex: 1;
    resize: none;
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 18px;
    color: var(--ink);
    font-size: 16px;
    line-height: 1.7;
    outline: none;
}

.editor-panel textarea:focus {
    box-shadow: inset 0 0 0 2px rgba(var(--primary-rgb), 0.18);
}

textarea::placeholder,
input::placeholder {
    color: var(--placeholder);
    opacity: 1;
}

.editor-footer {
    display: flex;
    min-height: 34px;
    align-items: center;
    justify-content: flex-end;
    border-top: 1px solid var(--line);
    padding: 0 14px;
    color: var(--muted);
    font-size: 11px;
    font-variant-numeric: tabular-nums;
}

.controls-band {
    display: grid;
    grid-template-columns: minmax(360px, 1.45fr) minmax(140px, 0.55fr) minmax(140px, 0.55fr) minmax(190px, 0.75fr);
    gap: 16px;
    align-items: end;
    margin-top: 18px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 16px 0;
}

.control-group {
    min-width: 0;
    margin: 0;
    border: 0;
    padding: 0;
}

.control-group.is-disabled {
    opacity: 0.48;
}

.control-group.is-disabled,
.control-group.is-disabled label,
.control-group.is-disabled select,
.control-group.is-disabled input[type="radio"] + span {
    cursor: not-allowed;
}

.control-group legend {
    padding: 0;
}

.segmented-control {
    display: grid;
    height: 42px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 3px;
    border-radius: 7px;
    background: var(--surface-muted);
    padding: 3px;
}

.segmented-control label {
    min-width: 0;
}

.segmented-control input {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
}

.segmented-control span {
    display: grid;
    height: 36px;
    min-width: 0;
    place-items: center;
    border: 1px solid transparent;
    border-radius: 5px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 650;
    line-height: 1.1;
    text-align: center;
    white-space: nowrap;
}

.segmented-control input:checked + span {
    border-color: var(--line);
    background: var(--surface);
    color: var(--ink);
    box-shadow: 0 1px 3px rgba(28, 40, 33, 0.08);
}

.segmented-control input:focus-visible + span {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.12);
}

select {
    width: 100%;
    height: 42px;
    min-width: 0;
    appearance: none;
    border: 1px solid var(--line-strong);
    border-radius: 6px;
    background-color: var(--surface);
    background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
    background-position: calc(100% - 15px) 18px, calc(100% - 10px) 18px;
    background-repeat: no-repeat;
    background-size: 5px 5px, 5px 5px;
    padding: 0 34px 0 11px;
    outline: none;
}

.action-row {
    display: flex;
    min-height: 80px;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.status-message {
    min-width: 0;
    min-height: 21px;
    flex: 1;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.status-error,
.status-success,
.status-working {
    display: inline-flex;
    width: fit-content;
    max-width: 100%;
    align-items: center;
    border-radius: 6px;
    padding: 7px 10px;
}

.status-error {
    background: var(--danger-soft);
    color: var(--danger);
}

.status-success {
    background: var(--success-soft);
    color: var(--success);
}

.status-working {
    background: var(--primary-soft);
    color: var(--primary);
}

.action-buttons,
.download-actions {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    gap: 9px;
}

.btn {
    display: inline-flex;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid transparent;
    border-radius: 7px;
    padding: 0 15px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
}

.btn svg {
    width: 17px;
    height: 17px;
    flex: 0 0 17px;
}

.btn-primary {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--surface);
}

.btn-primary:hover {
    border-color: var(--primary-hover);
    background: var(--primary-hover);
}

.btn-secondary,
.btn-download {
    border-color: var(--line-strong);
    background: var(--surface);
    color: var(--ink);
}

.btn-secondary:hover,
.btn-download:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
}

.btn:disabled {
    cursor: wait;
    opacity: 0.58;
}

.btn.is-loading svg {
    animation: spin 900ms linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.audio-panel {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    padding: 16px;
}

.audio-panel[hidden] {
    display: none;
}

.audio-heading-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 14px;
}

.btn-download {
    min-height: 36px;
    padding: 0 11px;
}

audio {
    display: block;
    width: 100%;
    height: 44px;
}

@media (max-width: 1020px) {
    .controls-band {
        grid-template-columns: minmax(340px, 1.4fr) repeat(2, minmax(140px, 0.6fr));
    }

    .voice-control {
        grid-column: 2 / 4;
    }

    .action-row {
        align-items: flex-start;
        flex-direction: column;
        padding: 16px 0;
    }

    .action-buttons {
        width: 100%;
    }

    .action-buttons .btn {
        flex: 1;
    }
}

@media (max-width: 760px) {
    .app-shell {
        padding: 0 16px 32px;
    }

    .topbar {
        min-height: 76px;
    }

    .brand-mark {
        width: 36px;
        height: 36px;
        flex-basis: 36px;
    }

    h1 {
        font-size: 18px;
    }

    .summary-label,
    .connection-summary-text,
    .summary-chevron {
        display: none;
    }

    .connection-settings summary {
        width: 40px;
        padding: 0;
        justify-content: center;
    }

    .connection-summary-state {
        position: absolute;
        top: 5px;
        right: 5px;
    }

    .connection-popover {
        right: 0;
    }

    main {
        padding-top: 16px;
    }

    .editor-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .editor-panel {
        height: 300px;
    }

    .controls-band {
        grid-template-columns: 1fr 1fr;
        gap: 13px 10px;
    }

    .style-control,
    .voice-control {
        grid-column: 1 / -1;
    }

    .voice-control {
        grid-row: auto;
    }

    .action-buttons {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .action-buttons .btn {
        min-width: 0;
    }

    #transform-speech-btn {
        grid-column: 1 / -1;
        grid-row: 1;
    }
}

@media (max-width: 480px) {
    .app-shell {
        padding-right: 12px;
        padding-left: 12px;
    }

    .brand-block {
        gap: 9px;
    }

    .product-label {
        font-size: 10px;
    }

    h1 {
        font-size: 17px;
    }

    .connection-popover {
        right: -1px;
        width: calc(100vw - 24px);
    }

    .connection-test-row {
        grid-template-columns: 1fr;
    }

    .btn-test {
        width: 100%;
    }

    .segmented-control.task-segments {
        height: auto;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .task-segments label:first-child {
        grid-column: 1 / -1;
    }

    .output-panel .panel-heading {
        min-height: 88px;
        align-items: stretch;
        flex-direction: column;
        justify-content: center;
        padding-top: 9px;
        padding-bottom: 9px;
    }

    .output-panel .panel-tools {
        width: 100%;
    }

    .output-panel .model-used {
        max-width: 170px;
    }

    .output-panel .panel-tools .icon-btn {
        margin-left: auto;
    }

    .editor-panel {
        height: 280px;
    }

    .editor-panel textarea {
        padding: 14px;
        font-size: 15px;
    }

    .segmented-control span {
        font-size: 12px;
    }

    .controls-band {
        grid-template-columns: 1fr;
    }

    .style-control,
    .compact-control,
    .voice-control {
        grid-column: 1;
    }

    .action-buttons {
        grid-template-columns: 1fr;
    }

    #transform-speech-btn,
    .action-buttons .btn {
        grid-column: 1;
        width: 100%;
    }

    .audio-heading-row {
        align-items: flex-start;
        flex-direction: column;
    }

    .download-actions {
        width: 100%;
    }

    .download-actions .btn {
        flex: 1;
    }
}

@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;
    }
}

/* ==========================================================================
   Shared Modal Architecture & Unified History Components
   ========================================================================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(18, 24, 20, 0.48);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    padding: 16px;
    animation: modalFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop[hidden] {
    display: none !important;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-dialog {
    position: relative;
    width: 100%;
    max-width: 580px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 48px rgba(18, 24, 20, 0.18), 0 4px 12px rgba(18, 24, 20, 0.08);
    overflow: hidden;
    animation: modalSlideUp 0.24s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

@keyframes modalSlideUp {
    from { transform: translateY(16px) scale(0.98); opacity: 0; }
    to { transform: translateY(0) scale(1); opacity: 1; }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--line);
    background: var(--surface-subtle);
}

.modal-title-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-title-group h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--ink);
}

.modal-icon {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

.modal-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-close-btn {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.15s ease;
}

.modal-close-btn:hover {
    color: var(--ink);
    background: var(--surface-hover);
}

/* History Modal Dialog */
.modal-history-dialog {
    max-width: 720px;
    max-height: 88vh;
}

.history-tabs-container {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-bottom: 1px solid var(--line);
    background: var(--surface);
}

.history-tabs {
    display: flex;
    gap: 6px;
    width: 100%;
}

.history-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    background: var(--surface-subtle);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
}

.history-tab:hover {
    color: var(--ink);
    border-color: var(--line-strong);
}

.history-tab.active {
    color: var(--primary-contrast);
    background: var(--primary);
    border-color: var(--primary);
}

.history-tab-badge {
    padding: 1px 6px;
    font-size: 11px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.08);
}

.history-tab.active .history-tab-badge {
    background: rgba(255, 255, 255, 0.25);
    color: var(--primary-contrast);
}

.history-modal-body {
    padding: 16px 20px 24px;
    max-height: 65vh;
    overflow-y: auto;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all 0.2s ease;
}

.history-item:hover {
    border-color: var(--primary);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.04);
}

.history-item.is-tts {
    border-left: 3px solid var(--accent);
}

.history-item.is-study {
    border-left: 3px solid var(--primary);
}

.history-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 12px;
    color: var(--muted);
    flex-wrap: wrap;
}

.history-type-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-type-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    padding: 2px 7px;
    border-radius: 4px;
    font-weight: 700;
}

.history-type-badge.tts-badge {
    background: var(--success-soft);
    color: var(--success);
}

.history-type-badge.study-badge {
    background: var(--primary-soft);
    color: var(--primary);
}

.history-time-group {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--muted);
    font-size: 12px;
}

.history-stats-group {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.history-stat-tag {
    background: var(--surface-subtle);
    padding: 2px 7px;
    border-radius: 4px;
    font-weight: 600;
    color: var(--ink);
    font-size: 11.5px;
    border: 1px solid var(--line);
}

.history-snippet {
    font-family: var(--font-serif);
    font-size: 14.5px;
    color: var(--ink);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    background: var(--surface-subtle);
    padding: 8px 12px;
    border-radius: var(--radius-xs);
}

.history-audio-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: var(--surface-subtle);
    border: 1px solid var(--line);
    border-radius: var(--radius-xs);
    padding: 6px 10px;
}

.btn-hist-play {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
}

.btn-hist-play.is-playing {
    background: var(--primary);
    color: var(--primary-contrast);
    border-color: var(--primary);
}

.history-audio-links {
    display: flex;
    gap: 6px;
}

.history-item-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
    flex-wrap: wrap;
}

.history-empty {
    text-align: center;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.history-empty .empty-icon-box {
    font-size: 32px;
}

.history-empty h4 {
    margin: 0;
    font-size: 17px;
    font-weight: 700;
    color: var(--ink);
}

.history-empty p {
    margin: 0;
    font-size: 13.5px;
    color: var(--muted);
    max-width: 440px;
    line-height: 1.6;
}

.nav-history-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    position: relative;
}

.nav-history-btn .count-badge {
    background: var(--accent);
    color: var(--surface);
    font-size: 11px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 999px;
    margin-left: 2px;
}


/* Three-page navigation (工作台 / 拆解 / 复习) on narrow screens */
.nav-tab span {
    white-space: nowrap;
}

@media (max-width: 760px) {
    .topbar {
        flex-wrap: wrap;
        gap: 10px 12px;
        padding-block: 10px;
    }

    .nav-tabs {
        order: 3;
        width: 100%;
    }

    .nav-tab {
        flex: 1;
        justify-content: center;
        gap: 5px;
        padding: 7px 8px;
    }
}

/* Global UI language switch (English / 中文), see static/i18n.js */
.lang-toggle {
    min-width: 58px;
    font-weight: 800;
}

/* Four nav tabs on a phone: text only */
@media (max-width: 480px) {
    .nav-tab i,
    .nav-tab svg {
        display: none;
    }

    .nav-tab {
        padding: 7px 4px;
        font-size: 12.5px;
    }
}

/* "A new version is live" bar (static/i18n.js) */
.new-version-bar {
    position: fixed;
    left: 50%;
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    transform: translateX(-50%);
    z-index: 10000;
    max-width: calc(100% - 32px);
    padding: 12px 20px;
    border: none;
    border-radius: 999px;
    background: var(--ink);
    color: var(--surface);
    font: inherit;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    cursor: pointer;
}

/* Compact header: one-line brand, and the active tab already names the page */
.brand-block {
    flex-shrink: 0;
}

.topbar-actions {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.brand-block .product-label {
    margin: 0;
    color: var(--ink);
    font-size: 18px;
    font-weight: 760;
    line-height: 1.2;
    white-space: nowrap;
}

.brand-block h1 {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}

/* Connection: a key icon with a status dot; the details live in the popover */
.connection-settings .summary-label,
.connection-settings .connection-summary-text,
.connection-settings .summary-chevron {
    display: none;
}

.connection-settings summary {
    width: 40px;
    padding: 0;
    justify-content: center;
}

.connection-settings .connection-summary-state {
    position: absolute;
    top: 5px;
    right: 5px;
}

/* Mid widths: text-only tabs keep everything on one row */
@media (max-width: 1180px) {
    .nav-tab i,
    .nav-tab svg {
        display: none;
    }
}

@media (max-width: 960px) {
    .topbar {
        flex-wrap: wrap;
        gap: 10px 12px;
        padding-block: 10px;
    }

    .nav-tabs {
        order: 3;
        width: 100%;
    }

    .nav-tab {
        flex: 1;
        justify-content: center;
    }
}

/* Repeat switch and the floating Stop button (playback.js) */
.btn-repeat-toggle.is-on {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
}

.playback-stop-pill {
    position: fixed;
    left: 50%;
    bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    z-index: 9000;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border: none;
    border-radius: 999px;
    background: var(--danger);
    color: var(--surface);
    font: inherit;
    font-weight: 700;
    box-shadow: var(--shadow);
    transform: translateX(-50%);
    cursor: pointer;
}

.playback-stop-pill svg {
    width: 16px;
    height: 16px;
}

.history-snippet {
    cursor: pointer;
}

.history-snippet:hover {
    background: var(--primary-soft);
}