/* === FONTS === */
@font-face { font-family: 'KHTeka'; src: url('../../fonts/KHTeka-Regular.otf') format('opentype'); font-weight: 400; font-display: swap; }
@font-face { font-family: 'KHTeka'; src: url('../../fonts/KHTeka-Medium.otf') format('opentype'); font-weight: 500; font-display: swap; }
@font-face { font-family: 'KHTeka'; src: url('../../fonts/KHTeka-Bold.otf') format('opentype'); font-weight: 700; font-display: swap; }

/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'KHTeka', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #0d1117;
    color: #c9d1d9;
    line-height: 1.6;
    min-height: 100vh;
}
a { color: #4df4a4; text-decoration: none; }
a:hover { text-decoration: underline; }

/* === NAV === */
nav {
    background: #161b22;
    border-bottom: 1px solid #30363d;
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: #e6edf3;
}
.logo:hover { text-decoration: none; }
.ex-hex { flex-shrink: 0; }
.nav-links { display: flex; gap: 24px; }
.nav-links a {
    color: #8b949e;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: #4df4a4; text-decoration: none; }
.hamburger {
    display: none;
    background: none;
    border: none;
    color: #e6edf3;
    font-size: 1.5rem;
    cursor: pointer;
}

/* === HERO === */
.hero {
    background: linear-gradient(135deg, #0d1117 0%, #161b22 50%, #0d1117 100%);
    border-bottom: 1px solid #30363d;
    padding: 60px 24px 50px;
    text-align: center;
}
.hero-content { max-width: 700px; margin: 0 auto; }
.hero h1 {
    font-size: 2.2rem;
    color: #e6edf3;
    margin-bottom: 16px;
    font-weight: 700;
}
.hero-sub {
    font-size: 1.05rem;
    color: #8b949e;
    margin-bottom: 24px;
    line-height: 1.7;
}
.trust-badges { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.badge {
    background: rgba(77, 244, 164, 0.08);
    border: 1px solid rgba(77, 244, 164, 0.2);
    border-radius: 20px;
    padding: 6px 16px;
    font-size: 0.85rem;
    color: #4df4a4;
    font-weight: 500;
}

/* === SCANNER === */
.scanner-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* Upload zone */
.upload-zone {
    border: 2px dashed #30363d;
    border-radius: 16px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: #161b22;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color: #4df4a4;
    background: rgba(77, 244, 164, 0.04);
}
.upload-icon { font-size: 3rem; margin-bottom: 16px; }
.upload-text { font-size: 1.2rem; color: #e6edf3; font-weight: 600; margin-bottom: 8px; }
.upload-sub { color: #8b949e; margin-bottom: 16px; }
.upload-formats { font-size: 0.8rem; color: #6e7681; }

/* Processing */
.processing {
    text-align: center;
    padding: 40px;
}
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #30363d;
    border-top-color: #4df4a4;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Results */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.results-header h2 { color: #e6edf3; font-size: 1.4rem; }
.results-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Buttons */
.btn {
    background: #4df4a4;
    color: #1a2535;
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}
.btn:hover { background: #3dd492; transform: translateY(-1px); }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-secondary { background: #30363d; color: #c9d1d9; }
.btn-secondary:hover { background: #3d444d; }
.btn-danger { background: #f85149; color: #fff; }
.btn-danger:hover { background: #da3633; }

/* Confidence bar */
.confidence-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 20px;
}
.confidence-label { font-size: 0.85rem; color: #8b949e; white-space: nowrap; }
.confidence-meter {
    flex: 1;
    height: 8px;
    background: #21262d;
    border-radius: 4px;
    overflow: hidden;
}
.confidence-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
    background: #4df4a4;
}
.confidence-fill.medium { background: #d29922; }
.confidence-fill.low { background: #f85149; }
.confidence-pct { font-weight: 700; font-size: 0.9rem; min-width: 40px; text-align: right; }

/* Certificate card */
.cert-card {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 12px;
    overflow: hidden;
}
.cert-card-header {
    background: rgba(77, 244, 164, 0.06);
    border-bottom: 1px solid #30363d;
    padding: 20px 24px;
}
.cert-card-header h3 { color: #e6edf3; font-size: 1.1rem; margin-bottom: 4px; }
.cert-card-header .cert-number { color: #4df4a4; font-size: 1.3rem; font-weight: 700; font-family: monospace; }
.cert-card-header .cert-type-badge {
    display: inline-block;
    background: #4df4a4;
    color: #1a2535;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 4px;
    margin-left: 8px;
    vertical-align: middle;
}

.cert-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
}
.cert-field {
    padding: 14px 24px;
    border-bottom: 1px solid #21262d;
}
.cert-field:nth-child(odd) { border-right: 1px solid #21262d; }
.cert-field-label {
    font-size: 0.75rem;
    color: #6e7681;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}
.cert-field-value {
    color: #e6edf3;
    font-weight: 500;
    font-size: 0.95rem;
}
.cert-field-value.highlight { color: #4df4a4; font-weight: 700; }
.cert-field-value.not-found { color: #6e7681; font-style: italic; }
.cert-field.full-width {
    grid-column: 1 / -1;
    border-right: none;
}

/* Raw text */
.raw-text-section { margin-top: 20px; }
.raw-text-section summary {
    cursor: pointer;
    color: #8b949e;
    font-size: 0.85rem;
    padding: 8px 0;
}
.raw-text {
    background: #0d1117;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 16px;
    font-size: 0.8rem;
    color: #8b949e;
    max-height: 300px;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

/* === HISTORY === */
.history-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
}
.history-section h2 { color: #e6edf3; margin-bottom: 8px; }
.history-info { color: #8b949e; font-size: 0.9rem; margin-bottom: 20px; }
.history-actions { margin-bottom: 20px; display: flex; gap: 8px; }
.history-list { display: flex; flex-direction: column; gap: 8px; }
.empty-state { color: #6e7681; font-style: italic; text-align: center; padding: 40px; }

.history-item {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: border-color 0.2s;
}
.history-item:hover { border-color: #4df4a4; }
.history-item-left h4 { color: #e6edf3; font-size: 0.95rem; margin-bottom: 4px; }
.history-item-left p { color: #8b949e; font-size: 0.8rem; }
.history-item-right { text-align: right; }
.history-item-marking { color: #4df4a4; font-family: monospace; font-size: 0.9rem; font-weight: 600; }
.history-item-date { color: #6e7681; font-size: 0.75rem; }

/* === ABOUT === */
.about-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
}
.about-section h2 { color: #e6edf3; margin-bottom: 24px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.about-card {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 12px;
    padding: 24px;
}
.about-card h3 { color: #e6edf3; margin-bottom: 12px; font-size: 1.05rem; }
.about-card p { color: #8b949e; font-size: 0.9rem; }
.about-card ul { color: #8b949e; font-size: 0.9rem; padding-left: 20px; }
.about-card li { margin-bottom: 4px; }

/* === FOOTER === */
footer {
    border-top: 1px solid #30363d;
    text-align: center;
    padding: 30px 24px;
    color: #6e7681;
    font-size: 0.8rem;
}
footer p + p { margin-top: 4px; }

/* === MOBILE === */
@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-links {
        display: none;
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background: #161b22;
        border-bottom: 1px solid #30363d;
        flex-direction: column;
        padding: 16px 24px;
        gap: 12px;
    }
    .nav-links.open { display: flex; }
    .hero { padding: 40px 16px 30px; }
    .hero h1 { font-size: 1.6rem; }
    .trust-badges { flex-direction: column; align-items: center; }
    .cert-grid { grid-template-columns: 1fr; }
    .cert-field:nth-child(odd) { border-right: none; }
    .about-grid { grid-template-columns: 1fr; }
    .upload-zone { padding: 40px 20px; }
    .results-header { flex-direction: column; align-items: flex-start; }
}

/* === TOAST === */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: #4df4a4;
    color: #1a2535;
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    z-index: 1000;
    animation: slideUp 0.3s ease, fadeOut 0.3s ease 2s forwards;
}
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } }
@keyframes fadeOut { to { opacity: 0; transform: translateY(-10px); } }