/* ========== style.css ========== */
:root {
    --primary: #4361ee;
    --primary-light: #4895ef;
    --secondary: #3f37c9;
    --accent: #f72585;
    --dark: #0a0c12;
    --light: #ffffff;
    --gray: #6c757d;
    --gray-light: #f8f9fa;
    --gray-dark: #343a40;
    --transition: all 0.2s ease;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 15px 30px rgba(0, 0, 0, 0.1);
    --blur-amount: 12px;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.5);
    --card-bg: #ffffff;
    --bg-gradient-start: #f5f7fa;
    --bg-gradient-end: #e9ecf5;
    --text-primary: var(--gray-dark);
    --text-secondary: var(--gray);
    --tag-bg: rgba(255, 255, 255, 0.6);
    --navbar-bg: rgba(255, 255, 255, 0.8);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --hover-bg: rgba(67, 97, 238, 0.1);
}

[data-theme="dark"] {
    --primary: #6d8cff;
    --primary-light: #8aacff;
    --secondary: #7b6cf6;
    --accent: #ff79a7;
    --dark: #ffffff;
    --light: #121212;
    --gray: #9ca3af;
    --gray-light: #2d2d3a;
    --gray-dark: #e5e7eb;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 15px 30px rgba(0, 0, 0, 0.4);
    --glass-bg: rgba(30, 35, 45, 0.85);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-bg: #2d2d3a;
    --bg-gradient-start: #121212;
    --bg-gradient-end: #1a1a2a;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --tag-bg: rgba(255, 255, 255, 0.1);
    --navbar-bg: rgba(30, 35, 45, 0.9);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --hover-bg: rgba(109, 140, 255, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.5;
    transition: background 0.3s ease, color 0.2s ease;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at 20% 30%, rgba(67, 97, 238, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 70%, rgba(247, 37, 133, 0.03) 0%, transparent 40%);
    filter: blur(60px);
    z-index: -2;
    animation: slowDrift 20s infinite alternate ease-in-out;
}

@keyframes slowDrift {
    0% {
        transform: scale(1) translate(0%, 0%);
        opacity: 0.5;
    }

    100% {
        transform: scale(1.1) translate(2%, -2%);
        opacity: 0.8;
    }
}

.navbar {
    position: sticky;
    top: 1rem;
    z-index: 100;
    max-width: 1200px;
    margin: 0 auto 1.5rem;
    padding: 0 1.5rem;
}

.navbar-container {
    background: var(--navbar-bg);
    backdrop-filter: blur(12px) saturate(180%);
    border-radius: 60px;
    padding: 0.5rem 1.5rem;
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 20px var(--shadow-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.navbar-logo span {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.navbar-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.navbar-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    border-radius: 30px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.9rem;
}

.navbar-link i {
    font-size: 0.8rem;
    color: var(--primary);
}

.navbar-link:hover {
    background: var(--hover-bg);
    color: var(--primary);
}

.theme-switch-wrapper {
    display: flex;
    align-items: center;
    margin-left: 1rem;
}

.theme-switch {
    position: relative;
    width: 60px;
    height: 30px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-switch label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5px;
    border: 1px solid var(--glass-border);
}

.theme-switch label i {
    font-size: 14px;
    color: white;
}

.main-container {
    max-width: 1200px;
    margin: 0 auto 2rem;
    padding: 0 1.5rem;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-amount)) saturate(180%);
    border-radius: 28px;
    padding: 1.8rem 2rem;
    margin-bottom: 1.8rem;
    border: 1px solid var(--glass-border);
    box-shadow: 0 10px 25px -10px var(--shadow-color);
    transition: var(--transition);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding-bottom: 0.5rem;
}

.section-header .icon-wrapper {
    width: 40px;
    height: 40px;
    background: rgba(67, 97, 238, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-header .icon-wrapper i {
    font-size: 1.3rem;
    color: var(--primary);
}

.section-header h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 0;
}

.teaser-img {
    width: 100%;
    border-radius: 20px;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    margin-bottom: 1rem;
}

.badge-venue {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.3rem 1.2rem;
    border-radius: 40px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.abstract-text {
    font-size: 1rem;
    line-height: 1.6;
    text-align: justify;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 1.5rem 0 0.5rem;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.4rem;
    border-radius: 40px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    box-shadow: 0 4px 12px rgba(67, 97, 238, 0.2);
}

.btn-primary:hover {
    background: var(--secondary);
    transform: translateY(-2px);
}

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

/* ENLARGED TITLE & AUTHORS */
.paper-title {
    font-size: 3.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin: 0.5rem 0 1rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

@media (max-width: 768px) {
    .paper-title {
        font-size: 2.2rem;
    }
}

.author-block {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin: 1.5rem 0 0.8rem;
    font-size: 1.1rem;
}

.author {
    text-align: center;
    font-weight: 500;
}

.affiliation {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}

.corresponding {
    font-size: 0.85rem;
    color: var(--primary);
    margin-top: 0.5rem;
}

.author sup {
    font-size: 0.75rem;
    color: var(--accent);
}

.demo-intro {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.demo-intro p {
    flex: 1 1 640px;
    color: var(--text-secondary);
}

.demo-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: flex-start;
}

.demo-link-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.55rem 0.95rem;
    border-radius: 999px;
    text-decoration: none;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    font-weight: 600;
}

.demo-toolbar {
    display: grid;
    gap: 1rem;
    margin-bottom: 1rem;
}

.dataset-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.dataset-tab,
.scene-chip {
    border: 1px solid var(--glass-border);
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.dataset-tab {
    padding: 0.7rem 1rem;
    border-radius: 999px;
    font-weight: 700;
}

.dataset-tab.active,
.scene-chip.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 10px 25px -14px rgba(67, 97, 238, 0.75);
}

.scene-nav {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 0.75rem;
    align-items: center;
}

.scene-chips {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    padding: 0.1rem;
    scrollbar-width: thin;
}

.scene-chips::-webkit-scrollbar {
    height: 6px;
}

.scene-chips::-webkit-scrollbar-track {
    background: var(--glass-border);
    border-radius: 999px;
}

.scene-chips::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 999px;
}

.scene-chip {
    flex: 0 0 auto;
    padding: 0.6rem 0.9rem;
    border-radius: 999px;
    font-size: 0.9rem;
    white-space: nowrap;
}

.scene-chip-current {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border: none;
    box-shadow: 0 10px 25px -14px rgba(67, 97, 238, 0.75);
}

.carousel-btn {
    background: var(--primary);
    color: white;
    border: none;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(67, 97, 238, 0.2);
    transition: var(--transition);
}

.carousel-btn:hover {
    transform: translateY(-2px);
    background: var(--secondary);
}

.comparison-meta {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.comparison-meta>div {
    padding: 0.9rem 1rem;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.38);
    border: 1px solid var(--glass-border);
}

.comparison-label {
    display: block;
    margin-bottom: 0.2rem;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.comparison-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.comparison-actions-copy {
    display: grid;
    gap: 0.2rem;
    color: var(--text-secondary);
}

.comparison-tools {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.magnifier-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.6rem 0.9rem;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--card-bg);
    color: var(--text-primary);
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.magnifier-toggle:hover {
    background: var(--hover-bg);
    border-color: var(--primary);
}

.magnifier-toggle.active {
    background: linear-gradient(135deg, #15986f, #39c28d);
    border-color: transparent;
    color: #fff;
}

.magnifier-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.7rem;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.55);
    border: 1px dashed var(--glass-border);
}

.comparison-showcase {
    position: relative;
    display: grid;
    gap: 1.25rem;
}

.comparison-method-tabs {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin: 0 0 1rem;
    padding: 0.35rem;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.36);
    border: 1px solid var(--glass-border);
}

.comparison-method-tab {
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    font-weight: 700;
}

.comparison-method-tab.active {
    background: var(--card-bg);
    color: var(--primary);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.comparison-method-tab:hover {
    color: var(--text-primary);
    background: rgba(67, 97, 238, 0.08);
}

.comparison-panel {
    display: none;
}

.comparison-panel.active {
    display: block;
}

.scene-chip-indicator {
    position: absolute;
    top: 6.2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 6;
}

.scene-chip-indicator .scene-chips {
    overflow: visible;
}

.carousel-btn-overlay {
    position: absolute;
    top: 58%;
    transform: translateY(-50%);
    z-index: 6;
    width: 44px;
    height: 44px;
    background: rgba(8, 11, 18, 0.72);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(8px);
}

.carousel-btn-overlay:hover {
    background: rgba(67, 97, 238, 0.9);
}

.carousel-btn-left {
    left: 1.05rem;
}

.carousel-btn-right {
    right: 1.05rem;
}

.slider-card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 1rem;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-md);
}

.comparison-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
    font-weight: 600;
}

.comparison-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.comparison-side-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.method-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 88px;
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    color: #fff;
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.method-ours {
    background: linear-gradient(135deg, #0f9d7a, #2dc08d);
}

.method-3dgs {
    background: linear-gradient(135deg, #2f6bff, #5ca2ff);
}

.method-difix3d {
    background: linear-gradient(135deg, #ef476f, #ff8fab);
}

.slider-stage {
    position: relative;
    width: 100%;
    height: clamp(420px, 62vh, 820px);
    --media-width: 100%;
    --media-height: 100%;
    border-radius: 18px;
    overflow: hidden;
    background:
        radial-gradient(circle at top left, rgba(92, 162, 255, 0.14), transparent 36%),
        radial-gradient(circle at bottom right, rgba(239, 71, 111, 0.12), transparent 34%),
        #080b12;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.slider-stage[data-orientation="portrait"] {
    height: clamp(560px, 78vh, 1040px);
}

.stage-media-frame {
    position: absolute;
    top: 50%;
    left: 50%;
    width: var(--media-width);
    height: var(--media-height);
    transform: translate(-50%, -50%);
    overflow: hidden;
}

.stage-video,
.stage-overlay {
    position: absolute;
    inset: 0;
}

.stage-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    display: block;
    background: transparent;
}

.stage-overlay {
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    clip-path: inset(0 50% 0 0);
    will-change: clip-path;
}

.magnifier-lens {
    position: absolute;
    width: 220px;
    height: 220px;
    left: 0;
    top: 0;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    pointer-events: none;
    display: none;
    z-index: 5;
    border: 2px solid rgba(255, 255, 255, 0.95);
    box-shadow: 0 16px 28px rgba(0, 0, 0, 0.35);
    background: rgba(8, 11, 18, 0.9);
}

.magnifier-lens.active {
    display: block;
}

.stage-divider {
    position: absolute;
    inset: 0 auto 0 50%;
    width: 0;
    pointer-events: none;
    z-index: 3;
    will-change: left;
}

.stage-divider::before {
    content: '';
    position: absolute;
    inset: 0;
    width: 2px;
    transform: translateX(-1px);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: 0 0 24px rgba(255, 255, 255, 0.35);
}

.stage-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 52px;
    height: 52px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
    font-size: 1rem;
}

.comparison-range {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    opacity: 0;
    cursor: ew-resize;
    z-index: 2;
    touch-action: none;
}

.slider-stage.magnifier-enabled,
.slider-stage.magnifier-enabled .comparison-range,
.slider-stage.magnifier-enabled .stage-video {
    cursor: none;
}


.slider-stage::before,
.slider-stage::after {
    position: absolute;
    top: 1rem;
    z-index: 2;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    backdrop-filter: blur(10px);
    background: rgba(8, 11, 18, 0.6);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.14);
}

.slider-card:first-child .slider-stage::before {
    content: '3DGS';
    left: 1rem;
}

.slider-card:first-child .slider-stage::after {
    content: 'FreeScale';
    right: 1rem;
}

.slider-card:last-child .slider-stage::before {
    content: 'Difix3D+';
    left: 1rem;
}

.slider-card:last-child .slider-stage::after {
    content: 'FreeScale';
    right: 1rem;
}

.demo-footnote {
    margin-top: 0.9rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

th,
td {
    padding: 8px 6px;
    text-align: center;
    border-bottom: 1px solid var(--glass-border);
}

th {
    background: var(--hover-bg);
    font-weight: 600;
}

.table-caption {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    text-align: center;
}

.footer {
    text-align: center;
    padding: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .glass-card {
        padding: 1.2rem;
    }

    .comparison-meta {
        grid-template-columns: 1fr;
    }

    .comparison-method-tabs {
        display: grid;
        gap: 0.45rem;
        width: 100%;
    }

    .comparison-method-tab {
        text-align: center;
    }

    .comparison-tools {
        width: 100%;
        justify-content: center;
    }

    .magnifier-toggle {
        width: 100%;
        justify-content: center;
    }

    .magnifier-hint {
        width: 100%;
        justify-content: center;
    }

    .scene-nav {
        grid-template-columns: 1fr;
    }

    .scene-chip-indicator {
        position: static;
        transform: none;
        margin: 0 auto 0.45rem;
    }

    .carousel-btn-overlay {
        position: static;
        transform: none;
        width: 42px;
        height: 42px;
        margin: 0;
        background: var(--primary);
        border: none;
        backdrop-filter: none;
    }

    .carousel-btn-left,
    .carousel-btn-right {
        left: auto;
        right: auto;
    }

    .carousel-btn {
        display: none;
    }

    .comparison-card-head,
    .comparison-title {
        align-items: flex-start;
        flex-direction: column;
    }

    .comparison-side-label {
        font-size: 0.82rem;
    }

    .slider-stage {
        height: clamp(320px, 52vh, 520px);
    }

    .slider-stage[data-orientation="portrait"] {
        height: clamp(460px, 70vh, 760px);
    }

    .navbar-menu {
        display: none;
    }

    .navbar-toggle {
        display: flex;
        background: var(--primary);
        width: 44px;
        height: 44px;
        border-radius: 50%;
        align-items: center;
        justify-content: center;
        cursor: pointer;
    }

    .navbar-toggle i {
        color: white;
        font-size: 1.2rem;
    }

    .navbar-menu.active {
        display: flex;
        position: fixed;
        top: 0;
        right: 0;
        width: 260px;
        height: 100vh;
        background: var(--navbar-bg);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 4rem 1.5rem;
        gap: 1rem;
        z-index: 200;
        box-shadow: -5px 0 20px var(--shadow-color);
    }

    .navbar-overlay.active {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 150;
    }

    .author-block {
        gap: 1rem;
        font-size: 0.9rem;
    }
}

@media (min-width: 769px) {

    .navbar-toggle,
    .navbar-overlay {
        display: none;
    }
}

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: 0.2s;
    z-index: 99;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top-btn {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

pre {
    background: var(--card-bg);
    padding: 0.8rem;
    border-radius: 16px;
    font-size: 0.7rem;
    overflow-x: auto;
    border: 1px solid var(--glass-border);
}