* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    --scroll-progress: 0%;
    background-color: #060606; /* Deep matte premium black */
    background-image:
        radial-gradient(circle at 75% 20%, rgba(215, 190, 147, 0.03), transparent 55%),
        radial-gradient(circle at 15% 75%, rgba(215, 190, 147, 0.02), transparent 65%);
    color: var(--text);
    font-family: var(--font-ui);
    font-size: 15px;
    line-height: 1.86;
    letter-spacing: 0.012em;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: radial-gradient(
        circle 480px at var(--mouse-x, 50%) var(--mouse-y, 50%), 
        rgba(215, 190, 147, 0.045), 
        transparent 80%
    );
    opacity: 0;
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: background;
}

body.mouse-active::before {
    opacity: 1;
}

body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    z-index: 40;
    width: var(--scroll-progress);
    height: 2px;
    background: linear-gradient(90deg, rgba(215, 190, 147, 0.4), rgba(255, 235, 197, 0.95), rgba(215, 190, 147, 0.5));
    box-shadow: 0 0 18px rgba(215, 190, 147, 0.45);
    pointer-events: none;
}

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

img {
    display: block;
    max-width: 100%;
}

.noise {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.015), transparent 30%);
}

.site-nav {
    position: fixed;
    top: 1.25rem;
    left: 50%;
    z-index: 20;
    display: flex;
    width: min(1360px, 92vw);
    transform: translateX(-50%);
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transform: translateX(-50%) translateY(-18px);
    transition: transform 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
                background-color 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
                backdrop-filter 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
                padding 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
                border-radius 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
                border-color 420ms cubic-bezier(0.2, 0.8, 0.2, 1),
                box-shadow 420ms cubic-bezier(0.2, 0.8, 0.2, 1);
    box-sizing: border-box;
    border: 1px solid transparent;
}

.site-nav.is-condensed {
    transform: translateX(-50%) translateY(-4px) scale(0.985);
    background: rgba(18, 18, 18, 0.36);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 0.6rem 1.6rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
    .site-nav.is-condensed {
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        background: rgba(18, 18, 18, 0.44);
        padding: 0.5rem 1.2rem;
    }
}

.brand {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.brand img {
    height: 1.5rem;
    width: auto;
    object-fit: contain;
    transition: transform 260ms ease, opacity 260ms ease;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.brand:hover img {
    transform: scale(1.05);
    opacity: 0.85;
}

.top-links {
    display: flex;
    gap: 1.6rem;
    flex-wrap: wrap;
    justify-content: flex-end;
    position: relative;
}

.top-links a {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--fs-nav-link);
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--text-soft);
    padding-bottom: 0.45rem;
    transition: color 260ms ease, transform 420ms cubic-bezier(0.18, 0.9, 0.22, 1);
}

.top-links a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: rgba(232, 221, 207, 0.82);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 220ms ease;
}

.top-links::after {
    content: "";
    position: absolute;
    left: var(--nav-glow-left, 0);
    bottom: -0.1rem;
    width: var(--nav-glow-width, 0px);
    height: 1px;
    background: linear-gradient(90deg, rgba(215, 190, 147, 0), rgba(255, 237, 203, 0.98), rgba(215, 190, 147, 0));
    opacity: var(--nav-glow-opacity, 0);
    transform: translateX(var(--nav-glow-shift, 0px));
    transition: left 260ms ease, width 260ms ease, opacity 260ms ease, transform 260ms ease;
    pointer-events: none;
    box-shadow: 0 0 14px rgba(255, 225, 168, 0.38);
}

.top-links a:hover,
.top-links a.is-active {
    color: var(--text);
}

.top-links a:hover::after,
.top-links a.is-active::after {
    transform: scaleX(1);
}

.top-links a.is-magnetic {
    color: var(--text);
}

.page-shell {
    position: relative;
    z-index: 1;
    width: min(1360px, 90vw);
    margin: 0 auto;
}

.hero-section {
    padding-top: 6.8rem;
}

.cover-section {
    padding-top: 6.8rem;
    min-height: 100vh;
    opacity: 0;
    transform: translateY(26px) scale(0.985);
}

.scroll-indicator,
.about-card h3 {
    font-family: var(--font-serif);
}

.cover-carousel {
    position: relative;
    overflow: hidden;
    width: 100%;
    --mx: 50%;
    --my: 50%;
}

.cover-track {
    display: flex;
    gap: 1.25rem;
    transition: transform 700ms ease;
    will-change: transform;
}

.cover-card-static {
    flex: none;
    width: 100%;
}

.cover-card {
    flex: 0 0 calc(100% - 20vw);
    position: relative;
    overflow: hidden;
    min-height: 68vh;
    border-radius: 1.2rem;
    transform: scale(0.96);
    opacity: 0.72;
    transition: transform 500ms ease, opacity 500ms ease;
    will-change: transform;
}

.cover-card.is-active {
    transform: scale(1);
    opacity: 1;
}

.cover-card img,
.cover-card video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scale(1.06);
    transition: transform 1.8s cubic-bezier(0.18, 0.82, 0.22, 1), opacity 1.2s ease;
}

.cover-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 72% 50%, rgba(255, 214, 151, 0.18), transparent 22%),
        linear-gradient(180deg, rgba(0, 0, 0, 0.16), rgba(0, 0, 0, 0.52));
    pointer-events: none;
    animation: slowDrift 12s ease-in-out infinite;
}

.cover-carousel::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 1.2rem;
    background: radial-gradient(circle at var(--mx) var(--my), rgba(255, 222, 170, 0.14), transparent 22%);
    mix-blend-mode: screen;
    opacity: 0;
    transition: opacity 260ms ease;
    pointer-events: none;
}

.cover-carousel.is-reactive::after {
    opacity: 1;
}

.cover-card-copy {
    position: absolute;
    left: 4.5rem;
    right: 4.5rem;
    bottom: 2.5rem;
    z-index: 1;
    transition: transform 700ms ease;
}

.cover-kicker-brand {
    display: block;
    margin: 0 0 0.8rem 0;
    font-size: var(--fs-kicker);
    font-weight: 600;
    letter-spacing: 0.45em; /* Increased spacing */
    text-transform: uppercase;
    color: #4ea57f; /* Muted, matte sage-forest green */
    opacity: 0;
    transform: translateY(22px);
    filter: blur(8px);
    transition: opacity 0.9s ease, transform 0.9s ease, filter 0.9s ease;
}

.cover-card-copy .sep {
    display: inline-block;
    width: clamp(0.4rem, 1.1vw, 0.8rem); /* Further reduced spacing between items */
    vertical-align: middle;
}

.cover-name {
    margin: 0 0 1.2rem clamp(-0.5rem, -1.2vw, -0.75rem);
    height: clamp(3.2rem, 8vw, 4.8rem);
    display: flex;
    align-items: center;
    opacity: 0;
    transform: translateY(22px);
    filter: blur(8px);
    transition: opacity 1.1s ease 0.05s, transform 1.1s ease 0.05s, filter 1.1s ease 0.05s;
}

.cover-name img {
    height: 100% !important;
    width: auto !important;
    object-fit: contain !important;
    position: static !important;
    transform: none !important;
    pointer-events: none;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.35));
}

.cover-role {
    margin: 0;
    font-family: var(--font-serif);
    max-width: none;
    font-size: clamp(0.9rem, 1.3vw, 1.08rem); /* Restored size for serif presence */
    font-weight: 400;
    line-height: 1.6;
    letter-spacing: 0.25em;
    color: rgba(255, 246, 233, 0.92);
    text-shadow: 0 0 24px rgba(0, 0, 0, 0.42);
    opacity: 0;
    transform: translateY(22px);
    filter: blur(8px);
    transition: opacity 1.15s ease 0.12s, transform 1.15s ease 0.12s, filter 1.15s ease 0.12s;
}

.cover-desc {
    max-width: 44rem;
    margin: 1.1rem 0 0; /* Slightly increased vertical separation */
    font-size: clamp(0.66rem, 0.8vw, 0.74rem);
    line-height: 1.8;
    letter-spacing: 0.14em;
    color: rgba(255, 246, 233, 0.45); /* Softened contrast to enhance hierarchy */
    opacity: 0;
    transform: translateY(22px);
    filter: blur(8px);
    transition: opacity 1.2s ease 0.18s, transform 1.2s ease 0.18s, filter 1.2s ease 0.18s;
}

.cover-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.cover-dots {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1.2rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(8px);
}

.cover-dot {
    width: 0.52rem;
    height: 0.52rem;
    border: 0;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.34);
    cursor: pointer;
    transition: width 220ms ease, background-color 220ms ease;
}

.cover-dot.is-active {
    width: 2.4rem;
    background: rgba(255, 255, 255, 0.72);
}

.cover-play {
    width: 4rem;
    height: 4rem;
    border: 0;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(8px);
    cursor: pointer;
    display: grid;
    place-items: center;
}

.cover-play-icon {
    width: 0;
    height: 0;
    border-left: 0.85rem solid rgba(255, 255, 255, 0.9);
    border-top: 0.55rem solid transparent;
    border-bottom: 0.55rem solid transparent;
    margin-left: 0.18rem;
}

.cover-play.is-paused .cover-play-icon {
    width: 0.82rem;
    height: 0.82rem;
    border: 0;
    background:
        linear-gradient(90deg, rgba(255,255,255,0.9) 0 32%, transparent 32% 68%, rgba(255,255,255,0.9) 68% 100%);
    margin-left: 0;
}

.cover-quote {
    max-width: 44rem;
    margin: 1.25rem auto 0;
    padding: 0.9rem 1.4rem;
    border: 1px solid var(--line);
    border-radius: 1rem;
    text-align: center;
    font-family: var(--font-ui);
    font-size: var(--fs-body);
    line-height: 1.9;
    letter-spacing: 0.04em;
    color: var(--text-soft);
    transition: transform 700ms ease, opacity 700ms ease;
    opacity: 0;
    filter: blur(6px);
}

.page-ready .cover-card img,
.page-ready .cover-card video {
    transform: scale(1);
}

.page-ready .cover-kicker-brand,
.page-ready .cover-name,
.page-ready .cover-role,
.page-ready .cover-desc,
.page-ready .cover-quote {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
}

.scroll-indicator {
    margin: 1rem auto 0;
    width: fit-content;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    color: var(--text-soft);
    font-size: 0.9rem;
    letter-spacing: 0.14em;
}

.scroll-arrow {
    font-size: 1.15rem;
    animation: floatArrow 2.2s ease-in-out infinite;
}

@keyframes floatArrow {
    0%, 100% { transform: translateY(0); opacity: 0.66; }
    50% { transform: translateY(6px); opacity: 1; }
}

.hero-frame {
    position: relative;
    overflow: hidden;
    border-radius: 2px;
    aspect-ratio: 16 / 9;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.hero-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 72% 58%, rgba(255, 214, 151, 0.22), transparent 22%),
        linear-gradient(180deg, rgba(0, 0, 0, 0.06), rgba(0, 0, 0, 0.48));
}

.hero-copy {
    position: absolute;
    left: 50%;
    bottom: 13%;
    width: 88%;
    transform: translateX(-50%);
    text-align: center;
}

.hero-kicker,
.metric-label {
    font-size: var(--fs-kicker);
    font-weight: 500;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.hero-copy h1,
.section-head h2,
.page-intro h1,
.page-block h2 {
    margin: 0;
    font-family: var(--font-serif);
    font-weight: 400;
    letter-spacing: 0.16em;
    color: var(--accent);
}

/* Performance Optimization: Skip rendering of off-screen heavy sections */
.tab-section, 
.video-deck-section, 
#xiaohongshu-app, 
.dashboard-wrapper,
.evidence-row,
.xhs-output-row {
    content-visibility: auto;
    contain-intrinsic-size: auto 500px;
}

/* Degrade backdrop-filter on mobile */
@media (max-width: 768px) {
    .glass-panel,
    .cover-flow-card,
    .app-dev-page .evidence-card,
    .xhs-text-lightbox-content,
    .xhs-stack-card {
        backdrop-filter: blur(4px) !important;
        -webkit-backdrop-filter: blur(4px) !important;
    }
}