index.css

:root {
    --bg: #f6efe6;
    --surface: rgba(255, 252, 247, 0.9);
    --text: #151821;
    --muted: #626b79;
    --line: rgba(17, 24, 39, 0.09);
    --accent: #e53935;
    --accent-strong: #ff7b67;
    --blue: #2563eb;
    --good: #1f8b5e;
    --warn: #c58a08;
    --bad: #cb4335;
    --shadow: 0 28px 64px rgba(22, 28, 45, 0.1);
    --radius-xl: 30px;
}

* {
    box-sizing: border-box;
}

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

body {
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(229, 57, 53, 0.14), transparent 25%),
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.1), transparent 24%),
        linear-gradient(180deg, #fbf7f1 0%, #efe4d7 100%);
    font-family: "Trebuchet MS", "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
    padding: 28px;
}

code,
.code-block,
.log-panel {
    font-family: "SFMono-Regular", Consolas, Menlo, Monaco, monospace;
}

a {
    color: inherit;
}

button,
input,
select {
    font: inherit;
}

.demo-shell {
    max-width: 1280px;
    margin: 0 auto;
}

.demo-logo {
    color: var(--text);
    text-decoration: none;
    font-size: 1.9rem;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.demo-badge {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 0 10px;
    border-radius: 999px;
    background: rgba(229, 57, 53, 0.12);
    color: #a53c34;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.demo-locale-switch {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    border-radius: 999px;
    background: rgba(17, 24, 39, 0.05);
    border: 1px solid rgba(17, 24, 39, 0.08);
}

.demo-locale-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 52px;
    min-height: 32px;
    padding: 0 12px;
    border-radius: 999px;
    color: rgba(17, 24, 39, 0.62);
    font-size: 0.88rem;
    font-weight: 700;
    text-decoration: none;
    transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.demo-locale-link:hover {
    color: var(--text);
    transform: translateY(-1px);
}

.demo-locale-link.is-active {
    background: linear-gradient(135deg, rgba(229, 57, 53, 0.86), rgba(255, 123, 103, 0.92));
    color: #ffffff;
    box-shadow: 0 10px 18px rgba(229, 57, 53, 0.18);
}

.demo-nav-links {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.demo-nav-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 14px;
    border-radius: 12px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: rgba(255, 255, 255, 0.76);
    color: var(--text);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 700;
    transition: background 0.18s ease, transform 0.18s ease;
}

.demo-nav-link:hover {
    background: rgba(255, 255, 255, 0.96);
    transform: translateY(-1px);
}

.demo-intro {
    display: grid;
    gap: 18px;
    max-width: 1180px;
    margin: 18px auto 18px;
    padding: 28px 34px 26px;
    border-radius: 30px;
    border: 1px solid rgba(17, 24, 39, 0.07);
    background:
        radial-gradient(circle at top left, rgba(229, 57, 53, 0.09), transparent 24%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 251, 246, 0.76));
    box-shadow: 0 22px 40px rgba(17, 24, 39, 0.06);
}

.demo-intro-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    flex-wrap: wrap;
}

.demo-intro-brandline {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex-wrap: wrap;
}

.demo-intro-actions {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.section-eyebrow,
.tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 16px;
    border-radius: 999px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: rgba(255, 255, 255, 0.8);
    color: #a53c34;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    white-space: nowrap;
}

.demo-intro-copy {
    min-width: 0;
}

.demo-intro-copy h1 {
    margin: 0 0 12px;
    max-width: none;
    font-size: clamp(2rem, 3vw, 3.15rem);
    line-height: 1.08;
    letter-spacing: -0.05em;
    text-wrap: pretty;
}

.demo-intro-copy p {
    margin: 0;
    color: var(--muted);
    max-width: 58rem;
    font-size: 1.03rem;
    line-height: 1.72;
}

html[lang^="zh"] .demo-intro-copy h1 {
    max-width: none;
    font-size: clamp(1.95rem, 2.7vw, 2.85rem);
    line-height: 1.14;
}

html[lang^="zh"] .demo-intro-copy p {
    max-width: 50rem;
    font-size: 1.02rem;
    line-height: 1.76;
}

.demo-logo-light {
    color: var(--text);
}

.demo-badge-light {
    background: rgba(229, 57, 53, 0.12);
    color: #a53c34;
}

.demo-locale-switch-light {
    background: rgba(17, 24, 39, 0.05);
    border-color: rgba(17, 24, 39, 0.08);
}

.demo-locale-link-light {
    color: rgba(17, 24, 39, 0.64);
}

.demo-locale-link-light:hover {
    color: var(--text);
}

.demo-nav-links-light {
    justify-content: flex-start;
}

.demo-nav-link-light {
    border-color: rgba(17, 24, 39, 0.08);
    background: rgba(255, 255, 255, 0.76);
    color: var(--text);
}

.demo-nav-link-light:hover {
    background: rgba(255, 255, 255, 0.96);
}

.player-workbench,
.surface-card {
    border-radius: var(--radius-xl);
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: rgba(255, 252, 247, 0.9);
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.player-workbench {
    max-width: 1180px;
    margin: 0 auto;
    padding: 16px 18px 18px;
}

.player-toolbar {
    display: grid;
    gap: 10px;
    margin-bottom: 12px;
}

.player-toolbar-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: 18px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(246, 247, 251, 0.92));
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.86);
}

.player-toolbar-tag,
.player-field-label,
.status-item label,
.section-head p,
.log-line strong {
    color: var(--muted);
}

.player-toolbar-tag,
.player-field-label,
.status-item label {
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.player-input-text,
.player-input-item,
.player-number-input,
.player-inline-value,
.player-input-button {
    min-height: 44px;
    border-radius: 14px;
    box-sizing: border-box;
}

.player-input-text,
.player-input-item,
.player-number-input {
    padding: 0 14px;
    border: 1px solid rgba(17, 24, 39, 0.1);
    background: rgba(255, 255, 255, 0.98);
    color: var(--text);
    font-size: 0.98rem;
    outline: none;
}

.player-input-text:focus,
.player-input-item:focus,
.player-number-input:focus {
    border-color: rgba(229, 57, 53, 0.26);
    box-shadow: 0 0 0 4px rgba(229, 57, 53, 0.08);
}

.player-input-text-url {
    width: 100%;
    min-width: 0;
    padding-right: 54px;
}

.media-source-combobox {
    position: relative;
    flex: 1 1 340px;
    min-width: 280px;
}

.media-source-toggle {
    position: absolute;
    top: 0;
    right: 0;
    width: 48px;
    height: 44px;
    border: 0;
    border-left: 1px solid rgba(17, 24, 39, 0.1);
    border-radius: 0 14px 14px 0;
    background: transparent;
    color: var(--text);
    font-size: 1.2rem;
    cursor: pointer;
}

.media-source-list {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    z-index: 30;
    width: 100%;
    max-height: min(58vh, 360px);
    overflow-y: auto;
    padding: 6px;
    border: 1px solid rgba(17, 24, 39, 0.12);
    border-radius: 14px;
    background: #fff;
    box-shadow: 0 16px 32px rgba(17, 24, 39, 0.18);
}

.media-source-list[hidden] {
    display: none;
}

.media-source-option {
    display: block;
    width: 100%;
    padding: 9px 10px;
    border: 0;
    border-radius: 9px;
    background: transparent;
    color: var(--text);
    text-align: left;
    cursor: pointer;
}

.media-source-option:hover,
.media-source-option:focus-visible,
.media-source-option[aria-selected="true"] {
    background: rgba(36, 111, 188, 0.1);
}

.media-source-option-label,
.media-source-option-url {
    display: block;
}

.media-source-option-label {
    font-size: 0.9rem;
    font-weight: 750;
}

.media-source-option-url {
    margin-top: 2px;
    color: var(--muted);
    font-size: 0.74rem;
    overflow-wrap: anywhere;
}

.player-field {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.player-field-inline .player-input-item,
.player-field-inline .player-number-input {
    width: 132px;
}

.player-field-projection .player-input-item {
    width: 184px;
}

.player-number-input {
    width: 112px;
}

.player-volume-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1 1 340px;
    min-width: 280px;
}

.player-volume-wrap .player-input-item {
    flex: 1 1 180px;
    width: auto;
}

.player-inline-value {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 70px;
    padding: 0 12px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(245,247,251,0.94));
    color: var(--text);
    font-weight: 700;
}

.player-input-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 247, 251, 0.94));
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.86);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.player-input-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 22px rgba(18, 25, 38, 0.09);
}

.player-input-button-primary {
    background: linear-gradient(135deg, #e53935, #ff7b67);
    color: #ffffff;
    border-color: rgba(229, 57, 53, 0.22);
}

.player-input-button-danger {
    background: linear-gradient(135deg, #111827, #1f2937);
    color: #ffffff;
}

input[type="range"].player-input-item {
    padding: 0;
    border: 0;
    background: rgba(59, 130, 246, 0.18);
    border-radius: 999px;
    height: 10px;
}

input[type="range"].player-input-item::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--blue);
    border-radius: 999px;
    cursor: pointer;
}

input[type="range"].player-input-item::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--blue);
    border-radius: 999px;
    cursor: pointer;
    border: 0;
}

.player-canvas-shell {
    position: relative;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
    overflow: hidden;
    border-radius: 24px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.08), transparent 24%),
        linear-gradient(180deg, #06080e 0%, #0e131c 100%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 22px 42px rgba(17, 24, 39, 0.16);
}

.player-sdk {
    position: relative;
    width: 960px;
    max-width: 100%;
    height: auto !important;
    min-height: 0;
    aspect-ratio: 16 / 9;
    margin: 0 auto;
}

.player-sdk canvas,
.player-sdk video {
    display: block;
    width: 100% !important;
    height: 100% !important;
    margin: 0 auto !important;
}

.player-hover-loading {
    position: absolute;
    inset: 0;
    z-index: 4;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: linear-gradient(180deg, rgba(4, 7, 12, 0.74), rgba(8, 11, 17, 0.84));
    color: rgba(255, 255, 255, 0.92);
    font-size: 0.96rem;
    letter-spacing: 0.04em;
    transition: opacity 0.2s ease;
}

.player-hover-spinner {
    width: 38px;
    height: 38px;
    border-radius: 999px;
    border: 3px solid rgba(255, 255, 255, 0.16);
    border-top-color: #ffffff;
    animation: player-hover-spin 0.85s linear infinite;
}

.player-hover-toggle {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 5;
    transform: translate(-50%, -50%) scale(0.96);
    min-width: 112px;
    min-height: 52px;
    padding: 0 22px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    background: rgba(9, 13, 20, 0.68);
    color: #ffffff;
    font-size: 0.98rem;
    font-weight: 700;
    backdrop-filter: blur(12px);
    opacity: 0;
    transition: opacity 0.18s ease, transform 0.18s ease, background 0.18s ease;
    cursor: pointer;
}

.player-canvas-shell:hover .player-hover-toggle,
.player-canvas-shell:focus-within .player-hover-toggle {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.player-hover-toggle:hover {
    background: rgba(220, 44, 44, 0.92);
}

.player-hover-progress-wrap {
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 12px;
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.player-hover-progress {
    position: relative;
    width: 100%;
    height: 8px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.18);
    cursor: pointer;
}

.player-hover-progress-fill {
    display: block;
    width: 0;
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, #ff6d67, #e53935);
}

.player-hover-time {
    color: rgba(255, 255, 255, 0.82);
    font-size: 0.82rem;
    text-align: right;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.player-status-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.status-item {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(248, 249, 252, 0.8));
    border: 1px solid rgba(17, 24, 39, 0.08);
    border-radius: 16px;
    padding: 12px 14px;
    min-height: 78px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.status-item label {
    display: block;
    margin-bottom: 8px;
}

.status-item span {
    display: block;
    font-size: 0.86rem;
    line-height: 1.45;
    word-break: break-word;
}

.secondary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
    max-width: 1180px;
    margin: 22px auto 0;
}

.surface-card {
    padding: 22px;
}

.section-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
}

.section-head h2 {
    margin: 0 0 6px;
    font-size: 1.65rem;
}

.section-head p {
    margin: 0;
    font-size: 0.96rem;
    line-height: 1.6;
}

.code-block,
.log-panel {
    border-radius: 18px;
    background: #171b1f;
    color: #dbe4ea;
    padding: 16px 18px;
    font-size: 0.78rem;
    line-height: 1.72;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

.code-block {
    min-height: 280px;
}

.log-panel {
    min-height: 280px;
    max-height: 380px;
}

.log-line + .log-line {
    margin-top: 6px;
}

.feature-card {
    max-width: 1180px;
    margin: 22px auto 0;
}

.feature-table-wrap {
    overflow: auto;
    border-radius: 18px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: rgba(255, 255, 255, 0.62);
}

.feature-table {
    width: 100%;
    min-width: 1280px;
    border-collapse: collapse;
    font-size: 0.82rem;
}

.feature-table th,
.feature-table td {
    padding: 12px 10px;
    border-right: 1px solid rgba(17, 24, 39, 0.08);
    border-bottom: 1px solid rgba(17, 24, 39, 0.08);
    text-align: center;
    vertical-align: middle;
}

.feature-table th:first-child,
.feature-table td:first-child {
    position: sticky;
    left: 0;
    z-index: 1;
    min-width: 210px;
    text-align: left;
    background: rgba(255, 252, 247, 0.98);
    font-weight: 700;
}

.feature-table thead th {
    position: sticky;
    top: 0;
    z-index: 2;
    background: rgba(255, 252, 247, 0.98);
    font-size: 0.74rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.feature-table thead th:first-child {
    z-index: 3;
}

.feature-table tr.row-highlight td {
    background: linear-gradient(180deg, rgba(229, 57, 53, 0.1), rgba(229, 57, 53, 0.05));
}

.feature-table tr.row-highlight td:first-child {
    background:
        linear-gradient(135deg, rgba(229, 57, 53, 0.18), rgba(37, 99, 235, 0.08)),
        rgba(255, 252, 247, 0.98);
}

.feature-row-title {
    display: grid;
    gap: 4px;
}

.feature-row-title strong {
    font-size: 0.95rem;
}

.feature-row-title span {
    color: var(--muted);
    font-size: 0.76rem;
    line-height: 1.55;
}

.feature-status {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 78px;
    font-weight: 700;
}

.feature-status::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 999px;
    display: inline-block;
}

.feature-status.yes {
    color: var(--good);
}

.feature-status.yes::before {
    background: var(--good);
    box-shadow: 0 0 0 4px rgba(31, 139, 94, 0.12);
}

.feature-status.no {
    color: var(--bad);
}

.feature-status.no::before {
    background: var(--bad);
    box-shadow: 0 0 0 4px rgba(203, 67, 53, 0.12);
}

.feature-status.unsure {
    color: var(--warn);
}

.feature-status.unsure::before {
    background: var(--warn);
    box-shadow: 0 0 0 4px rgba(197, 138, 8, 0.12);
}

@keyframes player-hover-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@media (max-width: 1180px) {
    .demo-topbar,
    .player-workbench,
    .secondary-grid,
    .feature-card,
    .demo-intro {
        max-width: none;
    }

    .secondary-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 920px) {
    body {
        padding: 18px;
    }

    .demo-intro {
        flex-direction: column;
        align-items: flex-start;
        gap: 18px;
    }

    .demo-intro-head,
    .demo-intro-actions {
        align-items: flex-start;
        justify-content: flex-start;
    }

    .demo-intro-head {
        flex-direction: column;
    }

    .demo-nav-links {
        justify-content: flex-start;
    }

    .player-status-strip {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .demo-logo {
        font-size: 1.6rem;
    }

    .demo-intro-copy h1 {
        max-width: none;
        font-size: clamp(1.75rem, 7vw, 2.45rem);
    }

    html[lang^="zh"] .demo-intro-copy h1 {
        max-width: none;
        font-size: clamp(1.72rem, 6.8vw, 2.3rem);
    }

    .demo-intro {
        padding: 22px 20px 20px;
    }

    .demo-intro-copy p,
    html[lang^="zh"] .demo-intro-copy p {
        max-width: none;
    }

    .player-workbench,
    .surface-card {
        padding-left: 14px;
        padding-right: 14px;
    }

    .media-source-combobox,
    .player-volume-wrap,
    .player-field,
    .player-input-button {
        min-width: 100%;
        flex-basis: 100%;
    }

    .player-field-inline {
        justify-content: space-between;
    }

    .player-field-inline .player-input-item,
    .player-field-inline .player-number-input {
        width: 144px;
    }

    .player-field-projection .player-input-item {
        width: 184px;
    }

    .player-sdk {
        min-height: 320px;
    }

    .player-hover-toggle {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

@media (max-width: 560px) {
    body {
        padding: 14px;
    }

    .demo-intro-brandline {
        flex-wrap: wrap;
    }

    .player-status-strip {
        grid-template-columns: 1fr;
    }

    .section-head {
        flex-direction: column;
    }
}