/* ============================================================
   KLBG Grading Proposal — Cinema Noir Premium
   Tách hoàn toàn khỏi style.css của shop chính.
   ============================================================ */

:root {
    --bg:           #0A0604;
    --bg-2:         #14100A;
    --bg-3:         #1E1810;
    --text:         #F0DCC8;
    --text-soft:    #C9B79F;
    --text-muted:   #9C8A75;
    --text-dim:     #6B5C4A;
    --gold:         #D4A95C;
    --gold-bright:  #F2CB7C;
    --gold-deep:    #B58940;
    --ember:        #FF4500;
    --ember-warm:   #FF8B4D;
    --line:         rgba(212, 169, 92, 0.16);
    --line-strong:  rgba(212, 169, 92, 0.4);
    --glass:        rgba(14, 10, 6, 0.55);
    --shadow-deep:  0 30px 80px -20px rgba(0,0,0,0.85), 0 4px 24px rgba(0,0,0,0.3);

    --font-display:    'Oswald', 'Be Vietnam Pro', 'Noto Serif SC', sans-serif;
    --font-serif:      'Cormorant Garamond', 'Be Vietnam Pro', 'Noto Serif SC', serif;
    --font-cn-display: 'Noto Serif SC', 'Oswald', serif;
    --font-body:       'Manrope', 'Be Vietnam Pro', 'Noto Sans SC', system-ui, sans-serif;

    --container: min(1240px, 92vw);
    --pad-y-section: clamp(80px, 12vw, 160px);

    --ease-soft: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-snap: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-lang="zh"] {
    --font-display: 'Noto Serif SC', 'Oswald', serif;
    --font-serif:   'Noto Serif SC', 'Cormorant Garamond', serif;
}

/* RESET ================================================ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.62;
    font-feature-settings: 'ss01', 'cv01', 'cv11';
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    background-image:
        radial-gradient(ellipse at 18% 8%,  rgba(255, 69, 0, 0.05) 0%, transparent 55%),
        radial-gradient(ellipse at 82% 92%, rgba(212, 169, 92, 0.04) 0%, transparent 60%);
    transition: opacity 240ms var(--ease-snap);
}

body.lang-transitioning { opacity: 0.04; }

img, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }

[data-lang="zh"] body { letter-spacing: 0.01em; }

/* GRAIN OVERLAY ======================================== */
.grain {
    position: fixed; inset: 0; pointer-events: none; z-index: 999;
    opacity: 0.045;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.95' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.95  0 0 0 0 0.85  0 0 0 0 0.65  0 0 0 0.7 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='0.65'/%3E%3C/svg%3E");
    background-size: 240px 240px;
}

/* HEADER =============================================== */
.proposal-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 22px clamp(20px, 4vw, 56px);
    background: linear-gradient(to bottom, rgba(10,6,4,0.8), rgba(10,6,4,0));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.brand-mark {
    display: inline-flex; align-items: center; gap: 14px;
    text-decoration: none; color: var(--text);
    font-family: var(--font-body);
}
.brand-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 36px; height: 36px;
    border: 1px solid var(--gold);
    border-radius: 2px;
    color: var(--gold);
    font-size: 16px;
    line-height: 1;
}
.brand-stack { display: inline-flex; flex-direction: column; gap: 2px; }
.brand-name {
    display: inline-flex; gap: 8px; align-items: baseline;
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 600;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--text);
}
.brand-name em {
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 500;
    color: var(--gold);
    letter-spacing: 0.04em;
    text-transform: lowercase;
    font-size: 16px;
}
[data-lang="zh"] .brand-name em {
    font-family: var(--font-cn-display);
    font-style: normal;
    font-weight: 500;
    letter-spacing: 0.06em;
}
.brand-attribution {
    font-family: var(--font-body);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.header-actions {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.header-demo-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 9px 16px;
    border: 1px solid rgba(212, 169, 92, 0.42);
    border-radius: 999px;
    background: rgba(14, 10, 6, 0.52);
    color: var(--gold-bright);
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-decoration: none;
    text-transform: uppercase;
    box-shadow: 0 4px 20px rgba(0,0,0,0.32);
    transition: color 220ms var(--ease-snap), border-color 220ms var(--ease-snap), background 220ms var(--ease-snap);
}

.header-demo-link:hover {
    background: rgba(212, 169, 92, 0.12);
    border-color: rgba(242, 203, 124, 0.68);
    color: var(--text);
}

/* LANG SWITCHER — Premium Glassmorphism ================= */
.lang-switcher {
    position: relative;
    display: inline-flex; align-items: center; gap: 0;
    padding: 4px;
    background: var(--glass);
    backdrop-filter: blur(22px) saturate(150%);
    -webkit-backdrop-filter: blur(22px) saturate(150%);
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,0.05),
        inset 0 -1px 0 rgba(0,0,0,0.4),
        0 4px 24px rgba(0,0,0,0.45),
        0 0 32px rgba(212,169,92,0.05);
    overflow: hidden;
}
.lang-switcher::before {
    content: '';
    position: absolute; inset: 0;
    pointer-events: none;
    background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 35%, transparent 65%, rgba(255,255,255,0.03) 100%);
    border-radius: inherit;
}
.lang-glow {
    position: absolute; inset: -2px;
    pointer-events: none;
    border-radius: inherit;
    background: radial-gradient(circle at 50% 50%, rgba(242,203,124,0.18), transparent 70%);
    opacity: 0;
    transition: opacity 280ms var(--ease-snap);
}
.lang-switcher:hover .lang-glow { opacity: 1; }

.lang-opt {
    appearance: none; background: transparent; border: 0;
    padding: 8px 16px;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0.16em;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 999px;
    position: relative;
    z-index: 1;
    transition: color 220ms var(--ease-snap), background 220ms var(--ease-snap), text-shadow 220ms var(--ease-snap);
}
.lang-opt:hover {
    color: var(--gold-bright);
    text-shadow: 0 0 14px rgba(242,203,124,0.5);
}
.lang-opt.active {
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-bright) 100%);
    color: var(--bg);
    box-shadow:
        0 2px 8px rgba(212,169,92,0.35),
        inset 0 -1px 0 rgba(0,0,0,0.18),
        inset 0 1px 0 rgba(255,255,255,0.35);
    text-shadow: none;
}
.lang-opt[data-lang="zh"] { font-family: var(--font-cn-display); font-weight: 700; letter-spacing: 0.06em; padding: 8px 14px; }

/* NAV BAR =============================================== */
.proposal-nav {
    display: none; /* Hidden by default */
}

@media (max-width: 1024px) {
    .proposal-nav { display: none; }
}

/* HERO ================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex; align-items: center;
    padding: 140px clamp(20px, 4vw, 56px) 80px;
    overflow: hidden;
}
.hero-video { position: absolute; inset: 0; z-index: 0; }
.hero-video video {
    width: 100%; height: 100%; object-fit: cover;
    filter: brightness(0.4) saturate(1.1) contrast(1.08);
}
.hero-overlay {
    position: absolute; inset: 0; z-index: 1;
    background:
        linear-gradient(180deg, rgba(10,6,4,0.55) 0%, rgba(10,6,4,0.35) 35%, rgba(10,6,4,0.95) 100%),
        radial-gradient(ellipse at 50% 60%, rgba(255,69,0,0.18) 0%, transparent 55%);
}
.hero-vignette {
    position: absolute; inset: 0; z-index: 2; pointer-events: none;
    background: radial-gradient(ellipse at 50% 50%, transparent 40%, rgba(10,6,4,0.6) 100%);
}

.hero-content {
    position: relative; z-index: 3;
    max-width: 1080px; margin: 0 auto;
    text-align: center;
}

.eyebrow {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--gold);
    padding: 8px 16px;
    border: 1px solid var(--line-strong);
    border-radius: 2px;
    margin-bottom: 38px;
    background: rgba(10,6,4,0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.hero-tagline {
    display: flex; flex-direction: column; align-items: center;
    font-family: var(--font-display);
    font-size: clamp(56px, 10.5vw, 168px);
    line-height: 0.92;
    letter-spacing: 0.005em;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 36px;
}
[data-lang="vi"] .hero-tagline {
    font-size: clamp(48px, 8.4vw, 132px);
    line-height: 1.04;
    letter-spacing: 0.002em;
    font-weight: 500;
    text-transform: none;
}
.hero-line {
    display: block;
    background: linear-gradient(180deg, #FFEFCF 0%, var(--gold) 55%, var(--gold-deep) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 4px 60px rgba(212, 169, 92, 0.18);
}
.hero-accent {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(18px, 2.4vw, 30px);
    font-weight: 400;
    text-transform: none;
    color: var(--ember-warm);
    letter-spacing: 0.02em;
    margin-top: 22px;
    background: none;
    -webkit-text-fill-color: var(--ember-warm);
}

[data-lang="zh"] .hero-tagline {
    font-size: clamp(54px, 9.5vw, 156px);
    font-weight: 600;
    letter-spacing: 0.05em;
    line-height: 1;
    gap: 6px;
}
[data-lang="zh"] .hero-accent {
    font-family: var(--font-cn-display);
    font-style: normal;
    font-weight: 400;
    letter-spacing: 0.18em;
}

.hero-subtitle {
    max-width: 640px; margin: 0 auto 48px;
    font-size: clamp(15px, 1.4vw, 18px);
    line-height: 1.72;
    color: var(--text);
    opacity: 0.86;
}

.hero-cta {
    display: inline-flex; align-items: center; gap: 14px;
    padding: 16px 36px;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--bg);
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-bright) 100%);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
    transition: transform 320ms var(--ease-snap), box-shadow 320ms var(--ease-snap);
    box-shadow:
        0 8px 32px -8px rgba(212,169,92,0.55),
        inset 0 1px 0 rgba(255,255,255,0.3),
        inset 0 -1px 0 rgba(0,0,0,0.18);
}
.hero-cta svg { transition: transform 320ms var(--ease-snap); }
.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow:
        0 14px 48px -8px rgba(242,203,124,0.7),
        inset 0 1px 0 rgba(255,255,255,0.35),
        inset 0 -1px 0 rgba(0,0,0,0.18);
}
.hero-cta:hover svg { transform: translateX(4px); }

.scroll-hint {
    position: absolute; bottom: 36px; left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    text-transform: lowercase;
}
[data-lang="zh"] .scroll-hint { font-family: var(--font-cn-display); font-style: normal; }
.scroll-hint::before {
    content: '';
    display: block;
    width: 1px; height: 36px;
    margin: 0 auto 14px;
    background: linear-gradient(to bottom, transparent, var(--gold));
    animation: scrollPulse 2.6s var(--ease-soft) infinite;
}
@keyframes scrollPulse {
    0%, 100% { transform: scaleY(0.35); transform-origin: top; opacity: 0.35; }
    50%      { transform: scaleY(1);    opacity: 1; }
}

/* SHOWCASE STRIP ======================================== */
.showcase {
    padding: clamp(60px, 8vw, 110px) clamp(20px, 4vw, 56px) clamp(40px, 5vw, 70px);
    background:
        linear-gradient(180deg, var(--bg) 0%, #060403 100%);
    position: relative;
}
.showcase-inner { max-width: var(--container); margin: 0 auto; }
.showcase-meta {
    display: flex; align-items: center; gap: 22px;
    margin-bottom: 42px;
    flex-wrap: wrap;
}
.showcase-label {
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--gold);
    white-space: nowrap;
}
.showcase-line {
    flex: 1; min-width: 60px;
    height: 1px;
    background: linear-gradient(to right, var(--gold), transparent);
    opacity: 0.5;
}
.showcase-caption {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 16px;
    color: var(--text-soft);
    letter-spacing: 0.01em;
}
[data-lang="zh"] .showcase-caption {
    font-family: var(--font-cn-display);
    font-style: normal;
    letter-spacing: 0.04em;
}
.showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(14px, 2vw, 28px);
}
.showcase-card {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1 / 1;
    border-radius: 2px;
    background: var(--bg-2);
    box-shadow: var(--shadow-deep);
    transition: transform 600ms var(--ease-soft);
}
.showcase-card::after {
    content: '';
    position: absolute; inset: 0;
    pointer-events: none;
    background: linear-gradient(180deg, transparent 55%, rgba(10,6,4,0.85) 100%);
    transition: opacity 360ms var(--ease-snap);
}
.showcase-card img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 900ms var(--ease-soft), filter 600ms var(--ease-snap);
    filter: saturate(0.92) contrast(1.04);
}
.showcase-card:hover { transform: translateY(-4px); }
.showcase-card:hover img { transform: scale(1.06); filter: saturate(1.08) contrast(1.08); }
.showcase-card figcaption {
    position: absolute;
    left: 18px; right: 18px; bottom: 14px;
    z-index: 2;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--gold-bright);
    text-shadow: 0 2px 12px rgba(0,0,0,0.85);
}
[data-lang="zh"] .showcase-card figcaption {
    font-family: var(--font-cn-display);
    font-style: normal;
    letter-spacing: 0.06em;
}

/* SERVICE INTRO (text + visual) ========================= */
.service-intro {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: clamp(40px, 6vw, 80px);
    align-items: center;
    margin-bottom: 24px;
}
.service-intro-text { display: flex; flex-direction: column; }
.service-intro-text .section-body { margin-top: 8px; }
.service-visual {
    position: relative;
    border-radius: 2px;
    overflow: hidden;
    background: var(--bg-3);
    box-shadow:
        0 30px 80px -20px rgba(0,0,0,0.85),
        0 0 0 1px var(--line),
        inset 0 0 0 1px rgba(255,255,255,0.02);
}
.service-visual::before {
    content: '';
    position: absolute; inset: 0;
    pointer-events: none;
    background:
        linear-gradient(180deg, rgba(10,6,4,0) 60%, rgba(10,6,4,0.8) 100%),
        radial-gradient(ellipse at 50% 50%, transparent 60%, rgba(10,6,4,0.5) 100%);
    z-index: 1;
}
.service-visual img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    filter: saturate(0.96);
}
.service-visual figcaption {
    position: absolute;
    left: 22px; right: 22px; bottom: 18px;
    z-index: 2;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 14px;
    color: var(--gold-bright);
    letter-spacing: 0.02em;
    text-shadow: 0 2px 12px rgba(0,0,0,0.85);
}
[data-lang="zh"] .service-visual figcaption {
    font-family: var(--font-cn-display);
    font-style: normal;
    letter-spacing: 0.06em;
}

/* PARTNER HEAD (text + visual) ========================== */
.partner-head {
    display: grid;
    grid-template-columns: 1.3fr 0.9fr;
    gap: clamp(40px, 6vw, 80px);
    align-items: center;
}
.partner-head-text .section-body {
    margin-top: 14px;
    max-width: 56ch;
}
.partner-visual {
    position: relative;
    border-radius: 2px;
    overflow: hidden;
    aspect-ratio: 4 / 5;
    background: var(--bg-3);
    box-shadow:
        0 30px 80px -20px rgba(0,0,0,0.85),
        0 0 0 1px var(--line);
}
.partner-visual::before {
    content: '';
    position: absolute; inset: 0;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(10,6,4,0) 50%, rgba(10,6,4,0.85) 100%);
    z-index: 1;
}
.partner-visual img {
    width: 100%; height: 100%; object-fit: cover;
    filter: saturate(0.94) contrast(1.06);
}
.partner-visual-badge {
    position: absolute;
    z-index: 2;
    top: 22px; left: 22px;
    padding: 8px 14px;
    background: linear-gradient(135deg, var(--gold) 0%, var(--gold-bright) 100%);
    color: var(--bg);
    font-family: var(--font-body);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    border-radius: 2px;
    box-shadow:
        0 6px 20px -4px rgba(212,169,92,0.5),
        inset 0 1px 0 rgba(255,255,255,0.35);
}

/* SECTION BASE ========================================== */
.section {
    padding: var(--pad-y-section) clamp(20px, 4vw, 56px);
    position: relative;
}
.section-darker { background: rgba(20, 16, 10, 0.4); }
.section-darker::before {
    content: '';
    position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: min(80%, 800px); height: 1px;
    background: linear-gradient(to right, transparent, var(--line-strong), transparent);
}
.section-darker::after {
    content: '';
    position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
    width: min(80%, 800px); height: 1px;
    background: linear-gradient(to right, transparent, var(--line-strong), transparent);
}

.section-inner { max-width: var(--container); margin: 0 auto; }

.section-eyebrow {
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 28px;
    display: flex; align-items: center; gap: 16px;
}
.section-eyebrow::before {
    content: '';
    width: 36px; height: 1px;
    background: var(--gold);
}

.section-heading {
    font-family: var(--font-display);
    font-size: clamp(38px, 5.8vw, 78px);
    line-height: 1.04;
    letter-spacing: 0.008em;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 36px;
    max-width: 18ch;
    background: linear-gradient(180deg, var(--text) 0%, var(--text-soft) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
[data-lang="vi"] .section-heading {
    font-size: clamp(30px, 4.0vw, 56px);
    line-height: 1.18;
    letter-spacing: 0.005em;
    font-weight: 500;
    text-transform: none;
    max-width: 24ch;
}
[data-lang="zh"] .section-heading {
    font-family: var(--font-cn-display);
    font-weight: 600;
    letter-spacing: 0.025em;
    text-transform: none;
    font-size: clamp(34px, 5.4vw, 68px);
    line-height: 1.18;
}

.section-body {
    max-width: 660px;
    font-size: 17px;
    line-height: 1.74;
    color: var(--text);
    opacity: 0.86;
}

/* PROBLEM — STATS ======================================= */
#problem .stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(24px, 4vw, 56px);
    margin-top: 96px;
    padding-top: 60px;
    border-top: 1px solid var(--line);
}
.stat { display: flex; flex-direction: column; gap: 18px; }
.stat-value {
    font-family: var(--font-display);
    font-size: clamp(72px, 9.8vw, 138px);
    line-height: 0.92;
    background: linear-gradient(180deg, #FFEFCF 0%, var(--gold) 60%, var(--gold-deep) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 600;
    letter-spacing: 0;
}
.stat-divider {
    width: 32px; height: 1px;
    background: var(--gold);
    opacity: 0.6;
}
.stat-label {
    font-size: 14px;
    line-height: 1.55;
    color: var(--text-muted);
    max-width: 24ch;
    letter-spacing: 0.01em;
}

/* SERVICE — FEATURE GRID ================================ */
#service .features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    margin-top: 96px;
    background: var(--line);
    border: 1px solid var(--line);
}
.feature {
    background: var(--bg-2);
    padding: clamp(36px, 4vw, 60px);
    display: flex; flex-direction: column; gap: 18px;
    position: relative;
    transition: background 360ms var(--ease-snap);
}
.feature:hover { background: var(--bg-3); }
.feature::before {
    content: '';
    position: absolute; top: 0; left: 0;
    width: 36px; height: 2px;
    background: var(--gold);
    transition: width 320ms var(--ease-snap);
}
.feature:hover::before { width: 80px; }
.feature-title {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(22px, 2vw, 30px);
    font-weight: 500;
    color: var(--gold-bright);
    letter-spacing: 0.005em;
}
[data-lang="vi"] .feature-title {
    font-family: var(--font-body);
    font-style: normal;
    font-weight: 500;
    font-size: clamp(19px, 1.7vw, 24px);
    line-height: 1.4;
    letter-spacing: 0.002em;
}
[data-lang="zh"] .feature-title {
    font-family: var(--font-cn-display);
    font-style: normal;
    font-weight: 600;
    letter-spacing: 0.025em;
}
.feature-desc {
    font-size: 15px;
    line-height: 1.72;
    color: var(--text);
    opacity: 0.84;
}

/* PROCESS — TIMELINE ==================================== */
#process .steps {
    list-style: none;
    margin-top: 96px;
    border-top: 1px solid var(--line);
}
.step {
    display: grid;
    grid-template-columns: 120px 1.4fr 2.2fr;
    gap: clamp(24px, 4vw, 56px);
    padding: 36px 0;
    border-bottom: 1px solid var(--line);
    align-items: baseline;
    transition: background 320ms var(--ease-snap);
    position: relative;
}
.step::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to right, transparent, rgba(212,169,92,0.05), transparent);
    opacity: 0;
    transition: opacity 320ms var(--ease-snap);
    pointer-events: none;
}
.step:hover::before { opacity: 1; }
.step-num {
    font-family: var(--font-display);
    font-size: clamp(40px, 4.2vw, 60px);
    color: var(--gold);
    line-height: 1;
    letter-spacing: 0.02em;
    font-weight: 500;
}
[data-lang="zh"] .step-num {
    font-family: var(--font-cn-display);
    font-weight: 600;
}
.step-title {
    font-family: var(--font-display);
    font-size: clamp(22px, 2.4vw, 32px);
    letter-spacing: 0.02em;
    color: var(--text);
    text-transform: uppercase;
    font-weight: 500;
}
[data-lang="vi"] .step-title {
    font-family: var(--font-body);
    font-size: clamp(19px, 1.9vw, 24px);
    text-transform: none;
    letter-spacing: 0.005em;
    font-weight: 500;
}
[data-lang="zh"] .step-title {
    font-family: var(--font-cn-display);
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0.04em;
}
.step-desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-muted);
}

/* PARTNERSHIP TWO COLUMNS =============================== */
#partner .columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    margin-top: 96px;
    background: var(--line);
    border: 1px solid var(--line);
}
.col {
    background: var(--bg-2);
    padding: clamp(36px, 4vw, 60px);
}
.col-title {
    font-family: var(--font-display);
    font-size: 18px;
    letter-spacing: 0.28em;
    color: var(--gold);
    margin-bottom: 32px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
    text-transform: uppercase;
    font-weight: 500;
}
[data-lang="zh"] .col-title {
    font-family: var(--font-cn-display);
    font-weight: 700;
    text-transform: none;
    letter-spacing: 0.16em;
}
.col-list { list-style: none; }
.col-list li {
    position: relative;
    padding: 18px 0 18px 36px;
    font-size: 15px;
    line-height: 1.66;
    border-bottom: 1px solid var(--line);
    color: var(--text);
}
.col-list li:last-child { border-bottom: 0; }
.col-list li::before {
    content: '◇';
    position: absolute; left: 0; top: 18px;
    color: var(--gold);
    font-size: 14px;
}

/* CTA TRIPTYCH ========================================== */
#cta {
    background:
        radial-gradient(ellipse at 50% 0%, rgba(255,69,0,0.07) 0%, transparent 50%),
        var(--bg);
}
#cta .triptych {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr;
    gap: 1px;
    margin-top: 96px;
    background: var(--line-strong);
    border: 1px solid var(--line-strong);
}
.cta-card {
    background: var(--bg-2);
    padding: clamp(32px, 3.6vw, 48px);
    display: flex; flex-direction: column; gap: 18px;
    transition: background 320ms var(--ease-snap);
}
.cta-card:hover { background: var(--bg-3); }
.cta-card-title {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(22px, 2vw, 28px);
    color: var(--gold-bright);
    font-weight: 500;
}
[data-lang="zh"] .cta-card-title {
    font-family: var(--font-cn-display);
    font-style: normal;
    font-weight: 600;
}
.cta-card-desc { font-size: 14px; color: var(--text-muted); line-height: 1.62; }

.cta-card-btn {
    align-self: flex-start;
    padding: 13px 26px;
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--gold-bright);
    background: transparent;
    border: 1px solid var(--gold);
    border-radius: 2px;
    text-decoration: none;
    cursor: pointer;
    transition: all 240ms var(--ease-snap);
    margin-top: 6px;
}
.cta-card-btn:hover {
    background: var(--gold);
    color: var(--bg);
    box-shadow: 0 0 28px rgba(212,169,92,0.35);
}

#partnerForm {
    display: flex; flex-direction: column; gap: 12px;
    margin-top: 6px;
}
#partnerForm input {
    appearance: none;
    background: var(--bg);
    border: 1px solid var(--line);
    border-bottom: 1px solid var(--line-strong);
    padding: 13px 14px;
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--text);
    border-radius: 2px;
    transition: all 220ms var(--ease-snap);
}
#partnerForm input::placeholder { color: var(--text-dim); }
#partnerForm input:focus {
    outline: none;
    border-color: var(--gold);
    background: var(--bg-3);
    box-shadow: 0 0 0 1px rgba(212,169,92,0.25);
}
#partnerForm button {
    margin-top: 8px;
    padding: 14px 24px;
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--bg);
    background: linear-gradient(135deg, var(--gold), var(--gold-bright));
    border: 0;
    border-radius: 2px;
    cursor: pointer;
    transition: transform 240ms var(--ease-snap), box-shadow 240ms var(--ease-snap);
    box-shadow:
        0 8px 24px -8px rgba(212,169,92,0.45),
        inset 0 1px 0 rgba(255,255,255,0.3);
}
#partnerForm button:hover {
    transform: translateY(-2px);
    box-shadow:
        0 12px 32px -6px rgba(242,203,124,0.55),
        inset 0 1px 0 rgba(255,255,255,0.35);
}
.form-success {
    display: none;
    padding: 14px 16px;
    background: rgba(212,169,92,0.06);
    border: 1px solid var(--gold);
    border-radius: 2px;
    font-size: 13px;
    color: var(--gold-bright);
    margin-top: 8px;
    line-height: 1.55;
}
.form-success.visible {
    display: block;
    animation: fadeIn 360ms var(--ease-soft);
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* FOOTER ================================================ */
.proposal-footer {
    padding: 72px clamp(20px, 4vw, 56px) 48px;
    border-top: 1px solid var(--line);
    display: flex; flex-direction: column; gap: 14px;
    align-items: center;
    text-align: center;
    background: linear-gradient(to bottom, var(--bg), #050302);
}
.footer-tagline {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 17px;
    color: var(--gold-bright);
    letter-spacing: 0.01em;
    font-weight: 500;
}
[data-lang="zh"] .footer-tagline {
    font-family: var(--font-cn-display);
    font-style: normal;
    font-weight: 500;
    letter-spacing: 0.08em;
}
.footer-contact {
    font-family: var(--font-body);
    font-size: 13px;
    color: var(--text);
    letter-spacing: 0.1em;
}
.footer-contact a {
    color: var(--gold);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 220ms;
}
.footer-contact a:hover { border-bottom-color: var(--gold); }
.footer-copy {
    font-size: 11px;
    color: var(--text-dim);
    letter-spacing: 0.16em;
    text-transform: uppercase;
}
[data-lang="zh"] .footer-copy { text-transform: none; letter-spacing: 0.12em; }

/* SCROLL REVEAL ========================================= */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 760ms var(--ease-soft), transform 760ms var(--ease-soft);
}
[data-reveal].visible {
    opacity: 1;
    transform: translateY(0);
}
[data-reveal-delay="1"] { transition-delay: 80ms; }
[data-reveal-delay="2"] { transition-delay: 180ms; }
[data-reveal-delay="3"] { transition-delay: 280ms; }

/* RESPONSIVE ============================================ */
@media (max-width: 920px) {
    .proposal-header { padding: 16px 20px; }
    .brand-attribution { display: none; }
    .brand-name { font-size: 15px; letter-spacing: 0.16em; }
    #problem .stats { grid-template-columns: 1fr; gap: 48px; }
    #service .features { grid-template-columns: 1fr; }
    .step {
        grid-template-columns: 80px 1fr;
        grid-template-rows: auto auto;
        gap: 12px 20px;
    }
    .step-num { grid-row: 1 / span 2; }
    .step-title { grid-column: 2; }
    .step-desc { grid-column: 2; }
    #partner .columns { grid-template-columns: 1fr; }
    #cta .triptych { grid-template-columns: 1fr; }

    .showcase-grid { grid-template-columns: repeat(2, 1fr); }
    .service-intro { grid-template-columns: 1fr; gap: 36px; }
    .partner-head { grid-template-columns: 1fr; gap: 36px; }
    .partner-visual { aspect-ratio: 16 / 11; max-width: 520px; }
}
@media (max-width: 560px) {
    body { font-size: 16px; }
    .hero { padding-top: 120px; }
    .hero-tagline { font-size: clamp(48px, 14vw, 72px); }
    [data-lang="vi"] .hero-tagline { font-size: clamp(36px, 10vw, 56px); }
    [data-lang="zh"] .hero-tagline { font-size: clamp(44px, 12vw, 68px); }
    .section-heading { font-size: clamp(34px, 9vw, 44px); max-width: 100%; }
    [data-lang="vi"] .section-heading { font-size: clamp(26px, 7vw, 36px); max-width: 100%; }
    [data-lang="zh"] .section-heading { font-size: clamp(28px, 7.5vw, 38px); }
    .header-actions { gap: 8px; }
    .header-demo-link {
        min-height: 36px;
        padding: 8px 10px;
        font-size: 9px;
        letter-spacing: 0.1em;
    }
    .lang-opt { padding: 7px 12px; font-size: 11px; }
    .stat-value { font-size: clamp(64px, 18vw, 96px); }
}

/* ============================================================
   #opportunity — the killer pitch section (5 benefit cards)
   ============================================================ */
.section-pitch {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(ellipse at 18% 0%, rgba(255, 69, 0, 0.10), transparent 55%),
        radial-gradient(ellipse at 82% 100%, rgba(212, 169, 92, 0.08), transparent 60%),
        rgba(20, 16, 10, 0.5);
}
.section-pitch::before,
.section-pitch::after {
    content: '';
    position: absolute; left: 50%; transform: translateX(-50%);
    width: min(80%, 800px); height: 1px;
    background: linear-gradient(to right, transparent, var(--gold), transparent);
    opacity: 0.5;
}
.section-pitch::before { top: 0; }
.section-pitch::after  { bottom: 0; }
.pitch-bg {
    position: absolute; inset: 0;
    pointer-events: none;
    background:
        repeating-linear-gradient(
            115deg,
            transparent 0,
            transparent 80px,
            rgba(212, 169, 92, 0.025) 80px,
            rgba(212, 169, 92, 0.025) 81px
        );
    mask-image: radial-gradient(ellipse at 50% 50%, black 30%, transparent 75%);
}

.pitch-grid {
    margin-top: clamp(48px, 6vw, 72px);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(16px, 1.5vw, 22px);
    position: relative;
    z-index: 1;
}
.pitch-card-wide { grid-column: 1 / -1; }

.pitch-card {
    position: relative;
    background: linear-gradient(140deg, rgba(20, 16, 10, 0.85), rgba(14, 10, 6, 0.7));
    border: 1px solid var(--line);
    padding: clamp(32px, 3.5vw, 52px) clamp(28px, 3vw, 48px);
    display: flex; flex-direction: column; gap: 16px;
    transition: border-color 360ms var(--ease-snap), transform 480ms var(--ease-snap), background 360ms var(--ease-snap);
    overflow: hidden;
}
.pitch-card::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255, 69, 0, 0) 0%, rgba(255, 69, 0, 0.06) 100%);
    opacity: 0;
    transition: opacity 360ms var(--ease-snap);
    pointer-events: none;
}
.pitch-card:hover {
    border-color: rgba(212, 169, 92, 0.5);
    transform: translateY(-3px);
}
.pitch-card:hover::before { opacity: 1; }

.pitch-num {
    font-family: var(--font-display);
    font-size: clamp(40px, 4.5vw, 64px);
    font-weight: 600;
    line-height: 1;
    color: transparent;
    background: linear-gradient(135deg, var(--gold-bright) 0%, var(--ember) 80%);
    -webkit-background-clip: text;
            background-clip: text;
    letter-spacing: 0.02em;
    margin-bottom: 4px;
    opacity: 0.95;
}

.pitch-title {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(22px, 2vw, 30px);
    font-weight: 500;
    color: var(--text);
    letter-spacing: 0.005em;
    line-height: 1.25;
}
[data-lang="vi"] .pitch-title {
    font-family: var(--font-body);
    font-style: normal;
    font-weight: 500;
    font-size: clamp(19px, 1.7vw, 24px);
    line-height: 1.4;
    letter-spacing: 0.002em;
}
[data-lang="zh"] .pitch-title {
    font-family: var(--font-cn-display);
    font-style: normal;
    font-weight: 600;
    letter-spacing: 0.025em;
}
[data-lang="en"] .pitch-title {
    font-style: italic;
}

.pitch-desc {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-soft);
    max-width: 60ch;
}
[data-lang="zh"] .pitch-desc {
    font-family: var(--font-cn-body);
    line-height: 1.85;
}

@media (max-width: 820px) {
    .pitch-grid { grid-template-columns: 1fr; }
    .pitch-card-wide { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    [data-reveal] { opacity: 1; transform: none; }
}