/* ============================================================
   LeDeuxions × Claude Design System
   Warm, minimal, scholarly. Coral accent on cream canvas.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600;9..144,700&family=Inter:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    /* Surface */
    --bg-canvas: #FAF9F5;
    --bg-canvas-soft: #F5F4ED;
    --bg-card: #FFFFFF;
    --bg-sunken: #F0EEE5;
    --bg-inverse: #1F1E1B;

    /* Text */
    --text-primary: #1F1E1B;
    --text-secondary: #5C5B57;
    --text-muted: #8B8A85;
    --text-inverse: #FAF9F5;

    /* Accent — Claude coral */
    --accent: #D97757;
    --accent-hover: #C36648;
    --accent-soft: #F5E6DE;
    --accent-deep: #8B3A1C;

    /* Secondary accents */
    --indigo: #5B5BD6;
    --sage: #6B8E6B;
    --amber: #C99846;

    /* Borders */
    --border: #E8E5DA;
    --border-strong: #D5D1C5;
    --border-focus: var(--accent);

    /* Shadows — soft, paper-like */
    --shadow-xs: 0 1px 2px rgba(31, 30, 27, 0.04);
    --shadow-sm: 0 2px 6px rgba(31, 30, 27, 0.06), 0 1px 2px rgba(31, 30, 27, 0.04);
    --shadow-md: 0 8px 24px rgba(31, 30, 27, 0.08), 0 2px 6px rgba(31, 30, 27, 0.04);
    --shadow-lg: 0 20px 48px rgba(31, 30, 27, 0.12), 0 6px 12px rgba(31, 30, 27, 0.06);

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-pill: 999px;

    /* Type */
    --font-serif: 'Fraunces', 'Times New Roman', serif;
    --font-sans: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

    /* Spacing scale */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;
    --space-9: 96px;

    /* Layout */
    --container-narrow: 720px;
    --container: 1080px;
    --container-wide: 1280px;

    /* Motion */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-canvas);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}
img, svg, video { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; padding: 0; }
a { color: var(--accent); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--accent-hover); }

/* ============================================================
   Typography
   ============================================================ */
.serif { font-family: var(--font-serif); }
.mono { font-family: var(--font-mono); }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin: 0 0 var(--space-4);
    color: var(--text-primary);
}
h1 { font-size: clamp(2.2rem, 4.5vw, 3.6rem); font-weight: 500; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
h3 { font-size: clamp(1.3rem, 2.4vw, 1.6rem); }
h4 { font-size: 1.15rem; }
p { margin: 0 0 var(--space-4); color: var(--text-secondary); }
small { font-size: 0.85rem; color: var(--text-muted); }

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--accent);
    font-weight: 500;
}

.lead {
    font-size: 1.15rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

/* ============================================================
   Layout
   ============================================================ */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--space-5);
}
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 var(--space-5); }
.container-wide { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--space-5); }

.section { padding: var(--space-8) 0; }
.section-lg { padding: var(--space-9) 0; }

/* ============================================================
   Navbar
   ============================================================ */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(250, 249, 245, 0.85);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: var(--space-3) var(--space-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
}
.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-serif);
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.01em;
}
.nav-brand:hover { color: var(--text-primary); }
.nav-brand-mark {
    width: 28px; height: 28px;
    background: var(--accent);
    color: #fff;
    display: grid; place-items: center;
    border-radius: 8px;
    font-weight: 700;
    font-family: var(--font-serif);
    font-size: 0.95rem;
}
.nav-links {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}
.nav-link {
    color: var(--text-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all .15s var(--ease);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-sunken); }
.nav-link.active { color: var(--text-primary); background: var(--bg-sunken); }
.nav-toggle { display: none; }

@media (max-width: 720px) {
    .nav-links {
        position: absolute;
        top: 100%; left: 0; right: 0;
        flex-direction: column;
        align-items: stretch;
        background: var(--bg-canvas);
        border-bottom: 1px solid var(--border);
        padding: var(--space-3);
        gap: var(--space-1);
        display: none;
    }
    .nav-links.open { display: flex; }
    .nav-link { padding: var(--space-3); }
    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 40px; height: 40px;
        border-radius: var(--radius-md);
        color: var(--text-primary);
    }
    .nav-toggle:hover { background: var(--bg-sunken); }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 12px 22px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1;
    letter-spacing: -0.005em;
    transition: all .2s var(--ease);
    border: 1px solid transparent;
    text-decoration: none;
    white-space: nowrap;
    min-height: 44px;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: var(--shadow-xs);
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-strong);
}
.btn-secondary:hover { background: var(--bg-sunken); color: var(--text-primary); }
.btn-ghost {
    background: transparent;
    color: var(--text-primary);
}
.btn-ghost:hover { background: var(--bg-sunken); color: var(--text-primary); }
.btn-dark {
    background: var(--bg-inverse);
    color: var(--text-inverse);
}
.btn-dark:hover { background: #2A2926; color: var(--text-inverse); }
.btn-sm { padding: 8px 14px; font-size: 0.85rem; min-height: 36px; }
.btn-lg { padding: 16px 28px; font-size: 1.05rem; min-height: 52px; }
.btn-block { width: 100%; }
.btn:disabled,
.btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ============================================================
   Cards
   ============================================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all .2s var(--ease);
}
.card-hover:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.card-flat { background: var(--bg-sunken); border-color: transparent; }
.card-feature {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    height: 100%;
    transition: all .25s var(--ease);
}
.card-feature:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}
.card-icon {
    width: 56px; height: 56px;
    background: var(--accent-soft);
    color: var(--accent-deep);
    border-radius: var(--radius-md);
    display: grid;
    place-items: center;
    font-size: 1.6rem;
}

/* ============================================================
   Grid
   ============================================================ */
.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ============================================================
   Forms / Inputs
   ============================================================ */
.input,
.select,
.textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-strong);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.input:focus,
.select:focus,
.textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

/* ============================================================
   Dropzone
   ============================================================ */
.dropzone {
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius-lg);
    padding: var(--space-7) var(--space-5);
    text-align: center;
    background: var(--bg-canvas-soft);
    transition: all .2s var(--ease);
    cursor: pointer;
}
.dropzone:hover,
.dropzone.is-active {
    border-color: var(--accent);
    background: var(--accent-soft);
}
.dropzone-icon {
    font-size: 2.4rem;
    color: var(--accent);
    margin-bottom: var(--space-3);
}
.dropzone-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================================
   Badges / Pills
   ============================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: var(--accent-soft);
    color: var(--accent-deep);
    border-radius: var(--radius-pill);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.01em;
}
.badge-neutral { background: var(--bg-sunken); color: var(--text-secondary); }
.badge-sage { background: rgba(107,142,107,.12); color: #3F5C3F; }
.badge-indigo { background: rgba(91,91,214,.1); color: #3938A8; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
    padding: var(--space-9) 0 var(--space-8);
    text-align: center;
    position: relative;
}
.hero-eyebrow { margin-bottom: var(--space-4); }
.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 6vw, 4.4rem);
    line-height: 1.05;
    letter-spacing: -0.025em;
    margin-bottom: var(--space-5);
    font-weight: 500;
}
.hero-title em {
    font-style: italic;
    color: var(--accent);
    font-weight: 500;
}
.hero-lead {
    max-width: 640px;
    margin: 0 auto var(--space-6);
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.6;
}
.hero-cta { display: inline-flex; gap: var(--space-3); flex-wrap: wrap; justify-content: center; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    background: var(--bg-sunken);
    border-top: 1px solid var(--border);
    padding: var(--space-7) 0 var(--space-5);
    margin-top: var(--space-9);
    color: var(--text-secondary);
}
.site-footer-inner {
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-5);
}
.site-footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}
.site-footer h4 {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    margin-bottom: var(--space-3);
    font-weight: 600;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: var(--space-2); }
.site-footer a { color: var(--text-secondary); font-size: 0.92rem; }
.site-footer a:hover { color: var(--accent); }
.site-footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-muted);
}
@media (max-width: 720px) {
    .site-footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-5); }
}

/* ============================================================
   Misc utilities
   ============================================================ */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent); }
.hidden { display: none !important; }
.divider { height: 1px; background: var(--border); border: none; margin: var(--space-6) 0; }
.spinner {
    width: 18px; height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin .8s linear infinite;
    display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

.fade-in { animation: fadeIn .5s var(--ease-out) both; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
}

/* Korean text rendering */
:lang(ko), [lang="ko"] { font-family: 'Noto Sans KR', var(--font-sans); }
:lang(ko) h1, :lang(ko) h2, :lang(ko) h3,
[lang="ko"] h1, [lang="ko"] h2, [lang="ko"] h3 {
    font-family: var(--font-serif), 'Noto Sans KR';
    font-weight: 600;
}

/* Print friendliness */
@media print {
    .nav, .site-footer, .no-print { display: none !important; }
    body { background: #fff; color: #000; }
}