:root {
    --bg-desk: #F5F0E8;
    --bg-sheet: #FCF9F5;
    --bg-hover: #F8F3EB;
    --text-primary: #5B4A3F;
    --text-secondary: #80756E;
    --text-muted: #A6917C;
    --amber: #D4A853;
    --amber-hover: #C49A45;
    --amber-light: rgba(212, 168, 83, 0.12);
    --amber-glow: rgba(212, 168, 83, 0.25);
    --green: #7A9B6D;
    --green-light: rgba(122, 155, 109, 0.12);
    --red: #C4636A;
    --red-light: rgba(196, 99, 106, 0.12);
    --blue: #5B8FA8;
    --blue-light: rgba(91, 143, 168, 0.12);
    --border: #DED3C5;
    --border-light: #EAE2D6;
    --shadow-warm: rgba(166, 145, 124, 0.15);
    --shadow-warm-md: rgba(166, 145, 124, 0.25);
    --shadow-warm-lg: rgba(166, 145, 124, 0.3);
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-pill: 9999px;
    --font-main: 'Space Grotesk', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --container: 1140px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: var(--font-main);
    background: var(--bg-desk);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }

.text-amber { color: var(--amber); }

.inline-code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--amber-light);
    padding: 2px 10px;
    border-radius: var(--radius-pill);
    color: var(--amber-hover);
}

.section-subtitle {
    margin-top: 12px;
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

/* === NAVBAR === */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(245, 240, 232, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 4px 20px var(--shadow-warm); }

.nav-container {
    max-width: var(--container); margin: 0 auto; padding: 0 24px;
    height: 64px; display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
    display: flex; align-items: center; gap: 10px;
    font-weight: 700; font-size: 1.25rem; color: var(--text-primary);
}
.logo-icon { width: 32px; height: 32px; }

.nav-links { display: flex; gap: 32px; }
.nav-link {
    font-size: 0.875rem; font-weight: 500; color: var(--text-secondary);
    transition: color var(--transition); position: relative;
}
.nav-link:hover { color: var(--text-primary); }
.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--amber);
    border-radius: 1px; transition: width var(--transition);
}
.nav-link:hover::after { width: 100%; }

/* === HERO === */
.hero { padding: 120px 24px 32px; text-align: center; }
.hero-container { max-width: 680px; margin: 0 auto; }

.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; background: var(--amber-light); color: var(--amber-hover);
    font-size: 0.8125rem; font-weight: 600; border-radius: var(--radius-pill);
    margin-bottom: 24px; animation: fadeInUp 0.6s ease;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.25rem); font-weight: 700;
    line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 16px;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-subtitle {
    font-size: 1.0625rem; color: var(--text-secondary); line-height: 1.7;
    max-width: 520px; margin: 0 auto; animation: fadeInUp 0.6s ease 0.2s both;
}

/* === UPLOAD SECTION === */
.upload-section { padding: 16px 24px 64px; }
.upload-container { max-width: 720px; margin: 0 auto; }

.upload-zone {
    background: var(--bg-sheet); border: 2px dashed var(--border);
    border-radius: var(--radius-lg); padding: 48px 32px; text-align: center;
    cursor: pointer; transition: all var(--transition); position: relative;
    overflow: hidden; animation: fadeInUp 0.6s ease 0.3s both;
}
.upload-zone::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent 40%, var(--amber-light) 100%);
    opacity: 0; transition: opacity var(--transition);
}
.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--amber);
    box-shadow: 0 8px 32px var(--shadow-warm-md);
    transform: translateY(-2px);
}
.upload-zone:hover::before, .upload-zone.drag-over::before { opacity: 1; }
.upload-zone-content { position: relative; z-index: 1; }

.upload-icon-wrapper {
    width: 80px; height: 80px; border-radius: 50%;
    background: var(--amber-light); display: flex; align-items: center;
    justify-content: center; margin: 0 auto 20px; color: var(--amber);
    transition: transform var(--transition);
}
.upload-zone:hover .upload-icon-wrapper { transform: scale(1.05); }

.upload-title { font-size: 1.25rem; font-weight: 600; margin-bottom: 4px; }
.upload-subtitle { color: var(--text-secondary); font-size: 0.9375rem; margin-bottom: 16px; }

.upload-info { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.upload-badge {
    padding: 4px 12px; background: var(--bg-desk); border: 1px solid var(--border-light);
    border-radius: var(--radius-pill); font-size: 0.75rem; font-weight: 500; color: var(--text-muted);
}

/* === UPLOAD PROGRESS === */
.upload-progress-area { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }

.progress-item {
    background: var(--bg-sheet); border: 1px solid var(--border-light);
    border-radius: var(--radius-md); padding: 14px 18px; animation: slideIn 0.3s ease;
}
.progress-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.progress-filename { font-size: 0.875rem; font-weight: 500; display: flex; align-items: center; gap: 8px; }
.progress-size { font-size: 0.75rem; color: var(--text-muted); }
.progress-bar-track { width: 100%; height: 6px; background: var(--border-light); border-radius: 3px; overflow: hidden; }
.progress-bar-fill { height: 100%; background: var(--amber); border-radius: 3px; transition: width 0.3s ease; }
.progress-bar-fill.complete { background: var(--green); }
.progress-bar-fill.error { background: var(--red); }
.progress-status { font-size: 0.75rem; margin-top: 6px; color: var(--text-muted); }
.progress-status.error { color: var(--red); }

/* === UPLOAD RESULTS === */
.upload-results-area { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }

.result-item {
    background: var(--bg-sheet); border: 1px solid var(--border-light);
    border-radius: var(--radius-md); padding: 16px 18px;
    animation: slideIn 0.3s ease; box-shadow: 0 2px 8px var(--shadow-warm);
}
.result-item.success { border-left: 3px solid var(--green); }
.result-item.error { border-left: 3px solid var(--red); }

.result-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.result-filename { font-weight: 600; font-size: 0.9375rem; display: flex; align-items: center; gap: 8px; }
.result-meta { display: flex; gap: 12px; font-size: 0.75rem; color: var(--text-muted); }

.result-link-group { display: flex; gap: 8px; align-items: center; }
.result-link {
    flex: 1; padding: 8px 14px; background: var(--bg-desk); border: 1px solid var(--border);
    border-radius: var(--radius-pill); font-family: var(--font-mono); font-size: 0.75rem;
    color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.result-link a { color: var(--amber); text-decoration: underline; text-underline-offset: 2px; }

.btn-copy-link {
    padding: 8px 16px; background: var(--text-primary); color: var(--amber);
    border: none; border-radius: var(--radius-pill); font-size: 0.75rem; font-weight: 600;
    display: flex; align-items: center; gap: 6px; transition: all var(--transition); white-space: nowrap;
}
.btn-copy-link:hover { background: #4A3D33; }
.btn-copy-link.copied { background: var(--green); color: #fff; }

/* === SECTIONS === */
.section-container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-label {
    display: inline-block; font-size: 0.75rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.08em; color: var(--amber); margin-bottom: 12px;
}
.section-title {
    font-size: clamp(1.75rem, 3.5vw, 2.25rem); font-weight: 700;
    letter-spacing: -0.02em; line-height: 1.2;
}

/* === FEATURES === */
.features { padding: 64px 24px 80px; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.feature-card {
    background: var(--bg-sheet); border: 1px solid var(--border-light);
    border-radius: var(--radius-lg); padding: 28px 24px;
    transition: all var(--transition); position: relative;
}
.feature-card::after {
    content: ''; position: absolute; bottom: -4px; left: 8px; right: 8px; height: 4px;
    background: var(--border-light); border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: -1; transition: all var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px var(--shadow-warm-md); }
.feature-card:hover::after { bottom: -6px; }

.feature-icon-wrapper {
    width: 52px; height: 52px; border-radius: var(--radius-md);
    background: var(--amber-light); display: flex; align-items: center;
    justify-content: center; color: var(--amber); margin-bottom: 16px;
}
.feature-title { font-size: 1.0625rem; font-weight: 600; margin-bottom: 8px; }
.feature-desc { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; }

/* === HOW IT WORKS === */
.how-it-works { padding: 64px 24px 80px; }
.steps-flow { display: flex; align-items: center; justify-content: center; gap: 16px; }

.step-card {
    flex: 1; max-width: 280px; background: var(--bg-sheet); border: 1px solid var(--border-light);
    border-radius: var(--radius-lg); padding: 32px 24px; text-align: center;
    position: relative; transition: all var(--transition);
}
.step-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px var(--shadow-warm-md); }

.step-number { font-size: 0.75rem; font-weight: 700; color: var(--amber); letter-spacing: 0.05em; margin-bottom: 16px; }
.step-icon {
    width: 64px; height: 64px; border-radius: 50%; background: var(--amber-light);
    display: flex; align-items: center; justify-content: center; color: var(--amber); margin: 0 auto 16px;
}
.step-title { font-size: 1.125rem; font-weight: 600; margin-bottom: 8px; }
.step-desc { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; }
.step-connector { color: var(--border); flex-shrink: 0; }

/* === API DOCS === */
.api-docs { padding: 64px 24px 80px; }
.api-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 32px; }

.api-card {
    background: var(--bg-sheet); border: 1px solid var(--border-light);
    border-radius: var(--radius-lg); padding: 24px; transition: all var(--transition);
}
.api-card:hover { box-shadow: 0 8px 24px var(--shadow-warm-md); transform: translateY(-2px); }

.api-method {
    display: inline-block; padding: 4px 14px; border-radius: var(--radius-pill);
    font-size: 0.6875rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.05em; margin-bottom: 8px;
}
.api-method.post { background: var(--amber-light); color: var(--amber-hover); }
.api-method.get { background: var(--green-light); color: var(--green); }
.api-method.head { background: var(--blue-light); color: var(--blue); }

.api-endpoint { font-family: var(--font-mono); font-size: 1rem; font-weight: 600; margin-bottom: 8px; }
.api-desc { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.5; }

.api-code-block { background: #2A2420; border-radius: var(--radius-md); overflow: hidden; }
.code-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 14px; background: rgba(255,255,255,0.05);
    font-size: 0.6875rem; font-weight: 600; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.05em;
}
.btn-copy {
    background: transparent; border: none; color: var(--text-muted);
    padding: 4px; border-radius: 4px; transition: color var(--transition); cursor: pointer;
}
.btn-copy:hover { color: var(--amber); }

.api-code-block pre { padding: 14px; overflow-x: auto; margin: 0; }
.api-code-block code { font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.7; color: #DED3C5; }

/* === ERROR TABLE === */
.error-table-wrapper {
    background: var(--bg-sheet); border: 1px solid var(--border-light);
    border-radius: var(--radius-lg); padding: 24px;
}
.error-table-title { font-size: 1rem; font-weight: 600; margin-bottom: 16px; }
.error-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.error-table th {
    text-align: left; padding: 10px 16px; font-weight: 600; font-size: 0.75rem;
    text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted);
    border-bottom: 2px solid var(--border);
}
.error-table td { padding: 12px 16px; border-bottom: 1px solid var(--border-light); color: var(--text-secondary); }
.error-code {
    display: inline-block; padding: 2px 10px; background: var(--red-light); color: var(--red);
    border-radius: var(--radius-pill); font-family: var(--font-mono); font-size: 0.8125rem; font-weight: 600;
}

/* === FOOTER === */
.footer { border-top: 1px solid var(--border-light); padding: 24px 24px 20px; }
.footer-container { max-width: var(--container); margin: 0 auto; }
.footer-row {
    display: flex; align-items: center; justify-content: space-between;
    padding-bottom: 16px; border-bottom: 1px solid var(--border-light);
}
.footer-nav { display: flex; gap: 24px; }
.footer-nav a { font-size: 0.8125rem; color: var(--text-secondary); transition: color var(--transition); }
.footer-nav a:hover { color: var(--amber); }
.footer-bottom { padding-top: 16px; text-align: center; font-size: 0.8125rem; color: var(--text-muted); }

/* === TOAST === */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 200; display: flex; flex-direction: column; gap: 8px; }
.toast {
    padding: 12px 20px; border-radius: var(--radius-pill); font-size: 0.8125rem; font-weight: 500;
    box-shadow: 0 8px 24px var(--shadow-warm-lg); animation: toastIn 0.3s ease;
    display: flex; align-items: center; gap: 8px;
}
.toast.success { background: var(--green); color: #fff; }
.toast.error { background: var(--red); color: #fff; }
.toast.info { background: var(--text-primary); color: var(--amber); }
.toast.fade-out { animation: toastOut 0.3s ease forwards; }

/* === ANIMATIONS === */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }
@keyframes toastOut { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(40px); } }

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .features-grid { grid-template-columns: 1fr; }
    .steps-flow { flex-direction: column; }
    .step-connector { transform: rotate(90deg); }
    .footer-row { flex-direction: column; gap: 16px; }
    .upload-zone { padding: 32px 20px; }
    .result-link-group { flex-direction: column; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .upload-info { flex-direction: column; align-items: center; }
}