/* ══════════════════════════════════════════════════════
   oh!NO — Anthropic-inspired Design System
   Palette: near-black · warm cream · terracotta accent
   Type: Playfair Display (serif) + Inter (sans)
══════════════════════════════════════════════════════ */

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

:root {
    /* ── Colour Tokens ── */
    --ink:           #100f0e;        /* near-black (warm) */
    --ink-mid:       #2e2b28;
    --ink-light:     #6b6560;
    --cream:         #faf7f2;        /* warm off-white body bg */
    --cream-dark:    #f0ebe2;        /* alternate section bg */
    --parchment:     #e8e1d6;        /* card/border on light */
    --hero-bg:       #0f0e0d;        /* hero dark */
    --hero-text:     #f0ebe2;        /* text on dark */
    --hero-muted:    #8a8278;        /* muted on dark */
    --accent:        #c96442;        /* terracotta / primary CTA */
    --accent-hover:  #a84f32;
    --border-light:  #ddd6ca;
    --border-dark:   rgba(240,235,226,0.10);

    /* ── Typography ── */
    --font-serif:    'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* ── Spacing ── */
    --section-pad:   5.5rem 2rem;
    --max-w:         960px;
    --max-w-wide:    1100px;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--ink);
    background: var(--cream);
    -webkit-font-smoothing: antialiased;
}

/* ──────────────────────────────────────────────────────
   NAVBAR
────────────────────────────────────────────────────── */
.navbar {
    background: var(--hero-bg);
    border-bottom: 1px solid var(--border-dark);
    position: sticky;
    top: 0;
    z-index: 200;
}

.nav-container {
    max-width: var(--max-w-wide);
    margin: 0 auto;
    padding: 0 2rem;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--hero-text);
    letter-spacing: -0.01em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.75rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--hero-muted);
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.01em;
    transition: color 0.2s;
}

.nav-menu a:hover { color: var(--hero-text); }

.nav-twin {
    color: var(--accent) !important;
    font-weight: 500 !important;
}

.btn-login {
    padding: 0.45rem 1.1rem !important;
    background: transparent !important;
    color: var(--hero-text) !important;
    border: 1px solid var(--border-dark) !important;
    border-radius: 4px !important;
    font-size: 0.82rem !important;
    transition: background 0.2s, border-color 0.2s !important;
}

.btn-login:hover {
    background: rgba(240,235,226,0.08) !important;
    border-color: rgba(240,235,226,0.3) !important;
    color: var(--hero-text) !important;
}

.nav-hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--hero-text);
    cursor: pointer;
    padding: 0.25rem;
}

/* ──────────────────────────────────────────────────────
   HERO
────────────────────────────────────────────────────── */
.hero {
    background: var(--hero-bg);
    color: var(--hero-text);
    padding: 8rem 2rem 7rem;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid rgba(201,100,66,0.35);
    border-radius: 2px;
    padding: 0.35rem 0.9rem;
    margin-bottom: 2.5rem;
}

.hero-content {
    max-width: 740px;
    margin: 0 auto;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 3.6rem;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--hero-text);
    margin-bottom: 1.5rem;
}

.hero h1 em {
    font-style: italic;
    font-weight: 500;
    color: #d4c9ba;
}

.hero p {
    font-size: 1.1rem;
    color: var(--hero-muted);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    font-weight: 300;
}

.hero p strong { color: var(--hero-text); font-weight: 500; }

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-footnote {
    margin-top: 1.25rem;
    font-size: 0.78rem;
    color: #5a5550;
    letter-spacing: 0.02em;
    margin-bottom: 0;
}

/* ──────────────────────────────────────────────────────
   BUTTONS
────────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: 0.7rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    border: 1px solid transparent;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--hero-text);
    border-color: var(--border-dark);
}

.btn-secondary:hover {
    background: rgba(240,235,226,0.08);
    border-color: rgba(240,235,226,0.25);
}

.btn-hero {
    padding: 0.85rem 2rem;
    font-size: 0.92rem;
}

/* On light sections, secondary btn adapts */
.light-section .btn-secondary {
    color: var(--ink);
    border-color: var(--border-light);
}
.light-section .btn-secondary:hover {
    background: var(--parchment);
}

/* ──────────────────────────────────────────────────────
   SOCIAL PROOF BAR
────────────────────────────────────────────────────── */
.social-proof-bar {
    background: var(--ink);
    border-bottom: 1px solid #2a2724;
    padding: 0.85rem 2rem;
    overflow-x: auto;
}

.social-proof-inner {
    max-width: var(--max-w-wide);
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    font-size: 0.8rem;
    color: var(--hero-muted);
    white-space: nowrap;
    flex-wrap: wrap;
}

.divider { color: #3a3632; }

/* ──────────────────────────────────────────────────────
   SECTION COMMONS
────────────────────────────────────────────────────── */
.section-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: var(--section-pad);
}

.section-inner-wide {
    max-width: var(--max-w-wide);
    margin: 0 auto;
    padding: var(--section-pad);
}

.section-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1rem;
    display: block;
}

.section-sub {
    color: var(--ink-light);
    font-size: 1.02rem;
    font-weight: 300;
    margin-top: -1rem;
    margin-bottom: 3.5rem;
    max-width: 580px;
    line-height: 1.8;
}

h2 {
    font-family: var(--font-serif);
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* ──────────────────────────────────────────────────────
   WHY SECTION  (dark background)
────────────────────────────────────────────────────── */
.why-section {
    background: var(--hero-bg);
    color: var(--hero-text);
}

.why-section .section-inner { max-width: 760px; }

.why-section h2 {
    font-size: 2.4rem;
    line-height: 1.2;
    margin-bottom: 2.5rem;
    color: var(--hero-text);
}

.quote-primary {
    border-left: 2px solid var(--accent);
    padding: 1.5rem 2rem;
    margin: 0 0 3rem;
    background: rgba(240,235,226,0.04);
    border-radius: 0 4px 4px 0;
}

.quote-greek {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-style: italic;
    color: var(--hero-text);
    margin-bottom: 0.6rem;
    opacity: 0.85;
}

.quote-ko {
    font-size: 1rem;
    color: #c8c0b4;
    margin-bottom: 0.5rem;
    font-weight: 300;
    line-height: 1.7;
}

.quote-primary cite,
.quote-secondary cite {
    font-size: 0.78rem;
    color: var(--hero-muted);
    font-style: normal;
    letter-spacing: 0.03em;
}

.why-body {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    margin-bottom: 2.5rem;
    font-size: 1rem;
    color: #c0b8ae;
    font-weight: 300;
    line-height: 1.85;
}

.why-body strong { color: var(--hero-text); font-weight: 500; }
.why-body em { color: #d4ccc0; font-style: italic; }

.why-highlight {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-style: italic;
    color: var(--hero-text) !important;
    font-weight: 500 !important;
    opacity: 0.9;
}

.ohno-promise {
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 2rem 2.25rem;
    margin-bottom: 3rem;
    background: rgba(201,100,66,0.05);
}

.promise-heading {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-style: italic;
    color: var(--hero-text);
    margin-bottom: 1.25rem;
}

.promise-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: #c0b8ae;
    font-weight: 300;
}

.promise-list li::before {
    content: "— ";
    color: var(--accent);
}

.promise-question {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--hero-text) !important;
    font-size: 1.05rem !important;
    font-weight: 500 !important;
}

.promise-question::before { content: "" !important; }

.quote-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1rem;
}

.quote-secondary {
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 1.5rem;
    background: rgba(240,235,226,0.03);
}

.quote-secondary p {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    font-style: italic;
    color: #b0a89e;
    line-height: 1.75;
    margin-bottom: 0.6rem;
    font-weight: 400;
}

.quote-comment {
    text-align: center;
    font-size: 0.8rem;
    color: var(--hero-muted);
    letter-spacing: 0.02em;
}

/* ──────────────────────────────────────────────────────
   BEFORE / AFTER  (warm cream section)
────────────────────────────────────────────────────── */
.before-after-section {
    background: var(--cream);
}

.before-after-section h2 {
    font-size: 2.2rem;
    margin-bottom: 2.5rem;
}

.ba-table-wrap { overflow-x: auto; }

.ba-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.93rem;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    overflow: hidden;
}

.ba-table th {
    padding: 1rem 1.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.ba-before {
    background: var(--cream-dark);
    color: var(--ink-light);
    text-align: center;
    width: 50%;
}

.ba-after {
    background: var(--ink);
    color: var(--hero-text);
    text-align: center;
    width: 50%;
}

.ba-table tbody tr { border-bottom: 1px solid var(--border-light); }
.ba-table tbody tr:last-child { border-bottom: none; }

.ba-table tbody td {
    padding: 1rem 1.5rem;
    vertical-align: middle;
    line-height: 1.5;
}

.ba-table tbody td:first-child {
    background: var(--cream-dark);
    color: var(--ink-light);
    font-weight: 300;
}

.ba-table tbody td:last-child {
    background: #1a1916;
    color: #c8c0b4;
    font-weight: 400;
}

/* ──────────────────────────────────────────────────────
   FEATURES  (alternate light)
────────────────────────────────────────────────────── */
.features {
    background: var(--cream-dark);
}

.features h2 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.features .section-sub {
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    padding: 2rem;
    background: var(--cream);
    border-radius: 6px;
    border: 1px solid var(--border-light);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(16,15,14,0.08);
}

.feature-icon {
    font-size: 1.75rem;
    margin-bottom: 0.9rem;
}

.feature-card h3 {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.6rem;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 0.88rem;
    color: var(--ink-light);
    line-height: 1.75;
    font-weight: 300;
}

/* ──────────────────────────────────────────────────────
   TWIN PROBLEM — KILLING POINT SPOTLIGHT  (dark premium)
────────────────────────────────────────────────────── */
.twin-section {
    background: var(--hero-bg);
    color: var(--hero-text);
    padding: var(--section-pad);
    border-top: 1px solid var(--border-dark);
    border-bottom: 1px solid var(--border-dark);
}

.twin-section .section-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    text-align: center;
}

.twin-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 0.3rem 0.9rem;
    border-radius: 2px;
    margin-bottom: 1.5rem;
}

.twin-headline {
    font-family: var(--font-serif);
    font-size: clamp(1.9rem, 4vw, 2.8rem);
    font-weight: 600;
    color: var(--hero-text);
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 1.1rem;
}

.twin-headline em {
    font-style: italic;
    color: var(--accent);
}

.twin-sub {
    font-size: 1.05rem;
    color: var(--hero-muted);
    max-width: 560px;
    margin: 0 auto 3rem;
    line-height: 1.75;
}

.twin-sub strong {
    color: var(--hero-text);
}

/* Main feature card */
.twin-main-card {
    display: flex;
    gap: 2.5rem;
    align-items: flex-start;
    background: rgba(240,235,226,0.04);
    border: 1px solid rgba(201,100,66,0.35);
    border-radius: 8px;
    padding: 2.5rem 3rem;
    text-align: left;
    margin-bottom: 3rem;
}

.twin-card-icon {
    font-size: 3rem;
    flex-shrink: 0;
    line-height: 1;
    margin-top: 0.2rem;
}

.twin-card-body h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--hero-text);
    margin-bottom: 0.9rem;
    letter-spacing: -0.01em;
}

.twin-en {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--hero-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-left: 0.5rem;
}

.twin-card-body > p {
    font-size: 0.95rem;
    color: #c8c0b4;
    line-height: 1.8;
    margin-bottom: 1.75rem;
}

.twin-card-body > p strong { color: var(--hero-text); }
.twin-card-body > p em { color: var(--accent); font-style: italic; }

/* Why boxes */
.twin-why {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(0,0,0,0.2);
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
}

.twin-why-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    flex: 1;
}

.twin-why-icon {
    font-size: 1.1rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 0.1rem;
    color: var(--hero-muted);
}

.twin-why-item--good .twin-why-icon {
    color: #6bbf78;
}

.twin-why-item strong {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--hero-text);
    margin-bottom: 0.2rem;
}

.twin-why-item span {
    font-size: 0.8rem;
    color: var(--hero-muted);
    line-height: 1.55;
}

.twin-why-arrow {
    font-size: 1.2rem;
    color: var(--accent);
    font-weight: 300;
    flex-shrink: 0;
}

.twin-cta {
    margin-top: 0.25rem;
}

/* Mini steps */
.twin-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 1rem;
    max-width: 700px;
    margin: 0 auto;
}

.twin-step {
    flex: 1;
    background: rgba(240,235,226,0.03);
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 1.5rem 1.25rem;
    text-align: center;
}

.twin-step-num {
    width: 1.8rem;
    height: 1.8rem;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 600;
    margin: 0 auto 0.9rem;
}

.twin-step p {
    font-size: 0.82rem;
    color: var(--hero-muted);
    line-height: 1.65;
}

.twin-step p strong {
    color: var(--hero-text);
}

.twin-step-arrow {
    color: var(--hero-muted);
    font-size: 1.2rem;
    margin-top: 1.5rem;
    flex-shrink: 0;
}

/* feature card highlight variant */
.feature-card--highlight {
    border-color: var(--accent);
    background: #fdf6f3;
    position: relative;
}

.badge-pro {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #fff;
    background: var(--accent);
    padding: 0.18rem 0.5rem;
    border-radius: 3px;
    vertical-align: middle;
    margin-left: 0.4rem;
}

/* pricing highlight row */
.pricing-highlight {
    color: var(--accent) !important;
    font-weight: 600;
}

/* ── responsive ── */
@media (max-width: 768px) {
    .twin-main-card {
        flex-direction: column;
        padding: 1.75rem 1.5rem;
    }
    .twin-card-icon {
        font-size: 2.2rem;
    }
    .twin-why {
        flex-direction: column;
    }
    .twin-why-arrow {
        transform: rotate(90deg);
        align-self: center;
    }
    .twin-steps {
        flex-direction: column;
    }
    .twin-step-arrow {
        transform: rotate(90deg);
        align-self: center;
        margin-top: 0;
    }
}

/* ──────────────────────────────────────────────────────
   HOW — Apple-style  (dark)
────────────────────────────────────────────────────── */
.how-section {
    background: var(--hero-bg);
    color: var(--hero-text);
    padding: var(--section-pad);
}

/* Big Apple-style statement */
.how-statement {
    text-align: center;
    margin-bottom: 4rem;
}

.how-trigger {
    font-family: var(--font-serif);
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 700;
    color: var(--hero-text);
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 0.6rem;
}

.how-trigger-sub {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--hero-muted);
    font-weight: 300;
    letter-spacing: -0.01em;
}

/* Cascade list — what one photo unlocks */
.how-cascade {
    max-width: 640px;
    margin: 0 auto 3.5rem;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.how-cascade-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.4rem 0;
    border-bottom: 1px solid var(--border-dark);
    transition: background 0.2s;
}

.how-cascade-item:first-child {
    border-top: 1px solid var(--border-dark);
}

.how-cascade-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 2rem;
    text-align: center;
    margin-top: 0.1rem;
}

.how-cascade-text {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.how-cascade-text strong {
    font-size: 1rem;
    font-weight: 600;
    color: var(--hero-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.how-cascade-text span {
    font-size: 0.88rem;
    color: var(--hero-muted);
    line-height: 1.7;
    font-weight: 300;
}

.how-cascade-item--pro .how-cascade-text strong {
    color: var(--accent);
}

/* CTA block */
.how-bottom {
    text-align: center;
}

.how-time {
    font-size: 1rem;
    color: var(--hero-muted);
    margin-bottom: 1.5rem;
    letter-spacing: 0.02em;
}

.how-time strong {
    color: var(--hero-text);
    font-size: 1.15rem;
}

/* ── responsive ── */
@media (max-width: 768px) {
    .how-trigger {
        font-size: 2.6rem;
    }
    .how-cascade-item {
        gap: 1rem;
    }
}

/* ──────────────────────────────────────────────────────
   SCIENCE  (warm cream)
────────────────────────────────────────────────────── */
.science-section {
    background: var(--cream);
}

.science-section h2 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.science-section .section-sub {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    display: block;
    margin-bottom: 3rem;
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 1.5rem;
}

.science-card {
    background: var(--cream-dark);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    padding: 2rem;
    transition: transform 0.2s;
}

.science-card:hover { transform: translateY(-3px); }

.science-icon {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.science-card h3 {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    letter-spacing: -0.01em;
}

.science-en {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.science-card p {
    font-size: 0.88rem;
    color: var(--ink-light);
    line-height: 1.8;
    font-weight: 300;
}

/* ──────────────────────────────────────────────────────
   TESTIMONIALS  (dark)
────────────────────────────────────────────────────── */
.testimonials-section {
    background: var(--hero-bg);
    color: var(--hero-text);
}

.testimonials-section h2 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    text-align: center;
    color: var(--hero-text);
}

.testimonials-disclaimer {
    font-size: 0.76rem;
    color: var(--hero-muted);
    text-align: center;
    margin-bottom: 3rem !important;
    letter-spacing: 0.01em;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.testimonial-card {
    background: rgba(240,235,226,0.04);
    border: 1px solid var(--border-dark);
    border-radius: 6px;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    transition: background 0.2s;
}

.testimonial-card:hover {
    background: rgba(240,235,226,0.07);
}

.testimonial-stars {
    font-size: 0.85rem;
    color: var(--accent);
}

.testimonial-card blockquote {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-style: italic;
    font-weight: 500;
    color: var(--hero-text);
    line-height: 1.45;
    margin: 0;
}

.testimonial-card p {
    font-size: 0.87rem;
    color: #948d84;
    line-height: 1.75;
    font-weight: 300;
    flex: 1;
}

.testimonial-author {
    font-size: 0.75rem;
    color: var(--hero-muted);
    border-top: 1px solid var(--border-dark);
    padding-top: 0.85rem;
    margin-top: auto;
    letter-spacing: 0.02em;
}

/* ──────────────────────────────────────────────────────
   FAQ  (warm cream)
────────────────────────────────────────────────────── */
.faq-section {
    background: var(--cream);
}

.faq-section h2 {
    font-size: 2.2rem;
    margin-bottom: 2.5rem;
    text-align: center;
}

.faq-list {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.faq-item {
    border-bottom: 1px solid var(--border-light);
}

.faq-item:first-child { border-top: 1px solid var(--border-light); }

.faq-item summary {
    padding: 1.2rem 0;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--ink);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: color 0.2s;
}

.faq-item summary:hover { color: var(--accent); }

.faq-item summary::after {
    content: "+";
    font-size: 1.3rem;
    color: var(--ink-light);
    flex-shrink: 0;
    line-height: 1;
    transition: transform 0.2s, color 0.2s;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
    color: var(--accent);
}

.faq-item p {
    padding: 0 0 1.25rem;
    font-size: 0.9rem;
    color: var(--ink-light);
    line-height: 1.8;
    font-weight: 300;
}

.faq-item p strong {
    color: var(--ink);
    font-weight: 500;
}

/* ──────────────────────────────────────────────────────
   PRICING  (dark alternate)
────────────────────────────────────────────────────── */
.pricing {
    background: var(--cream-dark);
    padding: 0;
}

.pricing h2 {
    font-size: 2.2rem;
    margin-bottom: 3rem;
    text-align: center;
}

.pricing-grid {
    max-width: 700px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 1.5rem;
}

.pricing-card {
    background: var(--cream);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    padding: 2.25rem 2rem;
    text-align: left;
    position: relative;
    transition: box-shadow 0.2s;
}

.pricing-card:hover {
    box-shadow: 0 8px 30px rgba(16,15,14,0.1);
}

.pricing-card.featured {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--hero-text);
}

.pricing-card h3 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.pricing-card.featured h3 { color: var(--hero-text); }

.badge-popular {
    display: inline-block;
    background: var(--accent);
    color: white;
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.2rem 0.6rem;
    border-radius: 2px;
    margin-bottom: 0.75rem;
}

.price {
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 600;
    color: var(--ink);
    margin: 1rem 0 1.5rem;
    letter-spacing: -0.03em;
}

.pricing-card.featured .price { color: var(--hero-text); }

.price span {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--ink-light);
    letter-spacing: 0;
}

.pricing-card.featured .price span { color: var(--hero-muted); }

.pricing-card ul {
    list-style: none;
    margin-bottom: 2rem;
}

.pricing-card li {
    padding: 0.45rem 0;
    font-size: 0.88rem;
    color: var(--ink-light);
    font-weight: 300;
    border-bottom: 1px solid var(--border-light);
}

.pricing-card li:last-child { border-bottom: none; }
.pricing-card.featured li { color: #948d84; border-color: var(--border-dark); }

/* ──────────────────────────────────────────────────────
   FINAL CTA  (dark)
────────────────────────────────────────────────────── */
.final-cta {
    background: var(--ink);
    color: var(--hero-text);
    text-align: center;
}

.final-cta h2 {
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    line-height: 1.25;
    color: var(--hero-text);
}

.final-cta p {
    font-size: 1rem;
    color: var(--hero-muted);
    font-weight: 300;
    margin-bottom: 2.5rem;
    line-height: 1.9;
}

.final-cta p strong { color: var(--hero-text); font-weight: 500; }

.cta-footnote {
    display: block;
    margin-top: 1rem;
    font-size: 0.76rem;
    color: #4a4540;
    letter-spacing: 0.03em;
}

/* ──────────────────────────────────────────────────────
   CONTACT
────────────────────────────────────────────────────── */
.contact {
    background: var(--cream-dark);
    text-align: center;
    padding: 4rem 2rem;
}

.contact h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
}

.contact p {
    font-size: 0.95rem;
    color: var(--ink-light);
    margin-bottom: 1.75rem;
    font-weight: 300;
}

.contact .btn-primary {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--hero-text);
}

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

/* ──────────────────────────────────────────────────────
   FOOTER
────────────────────────────────────────────────────── */
.footer {
    background: var(--hero-bg);
    border-top: 1px solid var(--border-dark);
    padding: 1.75rem 2rem;
    text-align: center;
    font-size: 0.78rem;
    color: #4a4540;
    letter-spacing: 0.02em;
}

/* ──────────────────────────────────────────────────────
   FADE-UP ANIMATION
────────────────────────────────────────────────────── */
.fade-up {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ──────────────────────────────────────────────────────
   RESPONSIVE
────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    :root { --section-pad: 3.5rem 1.25rem; }

    .nav-hamburger { display: block; }

    .nav-menu {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--hero-bg);
        flex-direction: column;
        padding: 1.25rem 1.75rem;
        gap: 0.85rem;
        border-bottom: 1px solid var(--border-dark);
        z-index: 199;
    }

    .nav-menu.open { display: flex; }
    .navbar { position: relative; }

    .hero { padding: 5.5rem 1.5rem 4.5rem; }

    .hero h1 { font-size: 2.4rem; }
    .hero p  { font-size: 0.97rem; }

    .hero-buttons { flex-direction: column; align-items: center; }
    .hero-buttons .btn { width: 100%; max-width: 300px; text-align: center; }

    .why-section h2,
    .before-after-section h2,
    .features h2,
    .how-section h2,
    .science-section h2,
    .testimonials-section h2,
    .faq-section h2,
    .pricing h2,
    .final-cta h2 {
        font-size: 1.9rem;
    }

    .final-cta h2 { font-size: 2rem; }

    .world-tree-section { padding: 5rem 0; }
    .tree-pillars-mobile { grid-template-columns: 1fr; gap: 2rem; }
    .tree-ascii { font-size: 0.7rem !important; padding: 1rem !important; }
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   World Tree Section — 지식의 나무
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.world-tree-section {
    background: #0a0a0a;
    color: #f5f1ea;
    padding: 9rem 0;
    position: relative;
}
.world-tree-section .section-label {
    color: #888;
    border-color: #333;
}
.tree-statement {
    text-align: center;
    margin: 2.5rem 0 2rem;
}
.tree-trigger {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.2rem, 6vw, 4rem);
    font-weight: 500;
    line-height: 1.05;
    color: #f5f1ea;
    margin: 0;
}
.tree-trigger-sub {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: clamp(2.2rem, 6vw, 4rem);
    font-weight: 500;
    color: #d4af6b;
    margin: 0;
}
.tree-lede {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 3rem;
    font-size: 1.05rem;
    line-height: 1.85;
    color: #c4bdaf;
}
.tree-lede em {
    color: #f5f1ea;
    font-style: italic;
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
}
.tree-visual {
    display: flex;
    justify-content: center;
    margin: 3rem 0 4rem;
}
.tree-ascii {
    font-family: ui-monospace, 'JetBrains Mono', monospace;
    color: #8a8270;
    font-size: 0.95rem;
    line-height: 1.5;
    padding: 2rem;
    border: 1px solid #2a2a2a;
    border-radius: 4px;
    background: #0e0e0e;
    white-space: pre;
    overflow-x: auto;
}
.tree-pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 980px;
    margin: 0 auto 3rem;
}
.tree-pillar {
    border-top: 1px solid #333;
    padding-top: 1.5rem;
}
.tree-pillar-num {
    font-family: 'Playfair Display', serif;
    font-size: 1rem;
    color: #d4af6b;
    letter-spacing: 0.08em;
    display: block;
    margin-bottom: 0.75rem;
}
.tree-pillar strong {
    display: block;
    font-size: 1.15rem;
    color: #f5f1ea;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}
.tree-pillar span {
    display: block;
    font-size: 0.93rem;
    color: #9a927f;
    line-height: 1.7;
}
.tree-footnote {
    text-align: center;
    color: #d4af6b;
    font-size: 0.92rem;
    font-style: italic;
    margin-top: 2rem;
}
@media (max-width: 768px) {
    .world-tree-section { padding: 5rem 0; }
    .tree-pillars { grid-template-columns: 1fr; gap: 2rem; }
    .tree-ascii { font-size: 0.72rem; padding: 1rem; }
}

/* Twin format note (LaTeX) */
.twin-format-note {
    margin-top: 1.25rem;
    padding: 1rem 1.25rem;
    border-left: 2px solid #d4af6b;
    background: rgba(212, 175, 107, 0.06);
    font-size: 0.93rem;
    line-height: 1.7;
    color: #555;
}
.twin-format-note strong { color: #0a0a0a; }
.twin-format-note em {
    font-family: 'Playfair Display', serif;
    font-style: italic;
}

@media (max-width: 768px) {
    .quote-row { grid-template-columns: 1fr; }

    .steps {
        flex-direction: column;
        align-items: stretch;
    }

    .step-arrow {
        text-align: center;
        padding: 0;
        transform: rotate(90deg);
        font-size: 1rem;
    }

    .ba-table { font-size: 0.82rem; }
    .ba-table th,
    .ba-table tbody td { padding: 0.75rem 1rem; }

    .pricing-card.featured { transform: none; }
}

/* ──────────────────────────────────────────────────────
   SCREENSHOTS — 기능 둘러보기 (placeholder for future video/gif swap)
────────────────────────────────────────────────────── */
.screenshots-section {
    background: var(--cream);
    padding: var(--section-pad);
    border-top: 1px solid var(--border-light);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.shot-card {
    background: #fff;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.25s, box-shadow 0.25s;
    display: flex;
    flex-direction: column;
}

.shot-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(16,15,14,0.10);
}

.shot-frame {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--cream-deep, #f4efe6);
    border-bottom: 1px solid var(--border-light);
}

.shot-frame img,
.shot-frame video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

.shot-num {
    position: absolute;
    top: 0.7rem;
    left: 0.85rem;
    font-family: var(--font-serif);
    font-size: 0.78rem;
    color: var(--ink-light);
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--border-light);
    border-radius: 999px;
    padding: 0.15rem 0.55rem;
    letter-spacing: 0.04em;
}

.shot-body {
    padding: 1.1rem 1.25rem 1.35rem;
}

.shot-body h3 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.35rem;
    letter-spacing: -0.01em;
}

.shot-body p {
    font-size: 0.84rem;
    color: var(--ink-light);
    line-height: 1.65;
    font-weight: 300;
}

.shot-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    color: #8b6f3a;
    background: #f6eccc;
    border-radius: 3px;
    padding: 0.1rem 0.4rem;
    margin-left: 0.35rem;
    letter-spacing: 0.05em;
    vertical-align: middle;
}

.screenshots-note {
    text-align: center;
    margin-top: 2.5rem;
    font-size: 0.78rem;
    color: var(--ink-light);
    font-style: italic;
    opacity: 0.7;
}

@media (max-width: 900px) {
    .screenshots-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .screenshots-grid { grid-template-columns: 1fr; gap: 1.25rem; }
}