/* ═══════════════════════════════════════
   KSeF Guide — Dark Theme
   Faktura-NT × Sokaris
   ═══════════════════════════════════════ */

:root {
    --bg-primary: #0a0a14;
    --bg-secondary: #12121e;
    --bg-card: #1a1a2e;
    --bg-card-hover: #222240;
    --border: #2a2a45;
    --text: #e4e4f0;
    --text-muted: #8888a8;
    --text-dim: #5c5c7a;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --accent-hover: #60a5fa;
    --green: #22c55e;
    --green-bg: rgba(34, 197, 94, 0.1);
    --yellow: #eab308;
    --yellow-bg: rgba(234, 179, 8, 0.1);
    --red: #ef4444;
    --red-bg: rgba(239, 68, 68, 0.1);
    --blue: #3b82f6;
    --blue-bg: rgba(59, 130, 246, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-hover); text-decoration: underline; }

.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ═══════ HERO ═══════ */
.hero {
    position: relative;
    padding: 80px 0 50px;
    text-align: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 30%, rgba(139,92,246,0.06) 0%, transparent 60%);
}
.hero-content { position: relative; z-index: 1; }
.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--accent-glow);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}
.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -1px;
}
.gradient-text {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-sub {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 550px;
    margin: 0 auto 30px;
}

/* Code Search */
.code-search { max-width: 480px; margin: 0 auto 24px; }
.code-search-inner {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}
.code-search-inner:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.code-search-icon {
    display: flex; align-items: center;
    padding: 0 12px;
    font-size: 18px;
}
.code-search input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 14px 8px;
    color: var(--text);
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    outline: none;
}
.code-search input::placeholder { color: var(--text-dim); }
.code-search button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 14px 24px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}
.code-search button:hover { background: var(--accent-hover); }

.code-result {
    margin-top: 12px;
    text-align: left;
}
.code-result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    animation: slideDown 0.3s ease;
}
.code-result-card.severity-danger { border-left: 4px solid var(--red); }
.code-result-card.severity-warning { border-left: 4px solid var(--yellow); }
.code-result-card.severity-info { border-left: 4px solid var(--accent); }
.code-result-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.code-result-code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 6px;
    background: var(--accent-glow);
    color: var(--accent);
}
.code-result-title { font-weight: 700; font-size: 16px; }
.code-result-problem { color: var(--text-muted); font-size: 14px; margin-bottom: 12px; }
.code-result-solution { font-size: 14px; line-height: 1.8; }
.code-result-solution code {
    background: rgba(59,130,246,0.15);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
}
.code-not-found {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-style: italic;
}

.hero-badges { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.pill {
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-muted);
    transition: var(--transition);
    cursor: pointer;
}
.pill:hover { border-color: var(--accent); color: var(--accent); }

/* ═══════ DEADLINE BANNER ═══════ */
.deadline-banner {
    background: linear-gradient(90deg, rgba(234,179,8,0.1), rgba(239,68,68,0.1));
    border-top: 1px solid rgba(234,179,8,0.2);
    border-bottom: 1px solid rgba(234,179,8,0.2);
    padding: 12px 0;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
}
.deadline-icon { font-size: 16px; margin-right: 6px; }
.deadline-banner strong { color: var(--yellow); }

/* ═══════ SECTION NAV ═══════ */
.section-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10,10,20,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0;
}
.nav-tabs {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 8px 0;
}
.nav-tabs::-webkit-scrollbar { display: none; }
.nav-tab {
    flex-shrink: 0;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    padding: 10px 18px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.nav-tab:hover { color: var(--text); background: var(--bg-card); }
.nav-tab.active {
    color: var(--accent);
    background: var(--accent-glow);
    border-color: rgba(59,130,246,0.3);
}

/* ═══════ MAIN CONTENT ═══════ */
.main-content { padding: 40px 20px 80px; }
.content-section { animation: fadeIn 0.3s ease; }
.section-desc { color: var(--text-muted); margin-bottom: 24px; font-size: 15px; }

/* Articles */
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
}
.article-card:hover { border-color: rgba(59,130,246,0.3); }
.article-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    cursor: pointer;
    user-select: none;
}
.article-header h3 {
    font-size: 15px;
    font-weight: 600;
    flex: 1;
}
.article-header .subtitle {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 400;
    margin-left: 8px;
}
.article-chevron {
    font-size: 12px;
    color: var(--text-dim);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: 12px;
}
.article-card.open .article-chevron { transform: rotate(180deg); }
.article-body {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}
.article-card.open .article-body {
    padding: 0 20px 20px;
    max-height: 2000px;
}
.article-body h4 { font-size: 14px; font-weight: 700; margin: 16px 0 8px; color: var(--text); }
.article-body ul, .article-body ol { padding-left: 20px; margin-bottom: 12px; }
.article-body li { margin-bottom: 6px; font-size: 14px; }
.article-body p { margin-bottom: 12px; font-size: 14px; }
.article-body code {
    background: rgba(59,130,246,0.15);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--accent);
}

/* Images */
.article-image {
    margin: 12px 0 16px;
    text-align: center;
}
.article-image img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.img-caption {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 8px;
    font-style: italic;
}

/* Alerts */
.alert {
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin: 12px 0;
    font-size: 14px;
    line-height: 1.6;
}
.alert-info { background: var(--blue-bg); border-left: 3px solid var(--blue); }
.alert-success { background: var(--green-bg); border-left: 3px solid var(--green); }
.alert-warning { background: var(--yellow-bg); border-left: 3px solid var(--yellow); }
.alert-danger { background: var(--red-bg); border-left: 3px solid var(--red); }

/* Tables */
.info-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 13px;
}
.info-table th {
    background: rgba(59,130,246,0.1);
    text-align: left;
    padding: 10px 14px;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}
.info-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
}
.info-table tr:last-child td { border-bottom: none; }

/* Timeline */
.timeline { margin: 16px 0; }
.timeline-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    border-left: 3px solid var(--border);
    margin-left: 8px;
}
.timeline-item.active { border-left-color: var(--green); }
.timeline-date {
    font-weight: 700;
    font-size: 14px;
    min-width: 140px;
    color: var(--accent);
}
.timeline-desc { font-size: 14px; }

/* Error cards */
.error-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 20px;
    margin: 12px 0;
}
.error-code {
    display: inline-block;
    background: var(--red-bg);
    color: var(--red);
    font-weight: 800;
    font-size: 18px;
    padding: 4px 12px;
    border-radius: 6px;
    margin-bottom: 6px;
    font-family: 'JetBrains Mono', monospace;
}
.error-title { font-weight: 700; font-size: 15px; margin-bottom: 4px; }
.error-cause { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.error-fix { font-size: 14px; }

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
}
.badge-red { background: var(--red-bg); color: var(--red); }
.badge-green { background: var(--green-bg); color: var(--green); }
.badge-blue { background: var(--blue-bg); color: var(--blue); }

/* Flow diagram */
.flow-diagram {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 16px 0;
    overflow-x: auto;
    padding: 8px 0;
}
.flow-step {
    background: var(--accent-glow);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    text-align: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}
.flow-step small { display: block; font-size: 11px; color: var(--text-muted); font-weight: 400; margin-top: 4px; }
.flow-arrow { font-size: 20px; color: var(--accent); flex-shrink: 0; }

/* Options / Checklist */
.option-list { margin: 12px 0; }
.option {
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    font-size: 14px;
}
.option input[type="checkbox"] { margin-right: 8px; }
.option p { margin: 6px 0 0 26px; font-size: 13px; color: var(--text-muted); }
.checklist { margin: 12px 0; }
.check-item { padding: 8px 0; font-size: 14px; }
.check-item.check-yes { color: var(--green); }
.check-item.check-no { color: var(--text-muted); }

/* ═══════ CODES SECTION ═══════ */
.codes-filter { margin-bottom: 20px; }
.codes-filter input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    outline: none;
    margin-bottom: 12px;
    transition: var(--transition);
}
.codes-filter input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.codes-cats { display: flex; gap: 6px; flex-wrap: wrap; }
.cat-pill {
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}
.cat-pill:hover { border-color: var(--accent); color: var(--text); }
.cat-pill.active { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }

#codesGrid { display: grid; gap: 12px; }

/* ═══════ FAQ ═══════ */
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    overflow: hidden;
    transition: var(--transition);
}
.faq-item:hover { border-color: rgba(59,130,246,0.3); }
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    user-select: none;
}
.faq-toggle {
    font-size: 18px;
    color: var(--text-dim);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: 12px;
}
.faq-item.open .faq-toggle { transform: rotate(45deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 20px;
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
}
.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 20px 16px;
}

/* ═══════ QUICK ARTICLES ═══════ */
.qa-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
}
.qa-card:hover {
    border-color: rgba(59,130,246,0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(59,130,246,0.1);
}
.qa-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.qa-card-id {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--accent-glow);
    color: var(--accent);
}
.qa-card-date {
    font-size: 12px;
    color: var(--text-dim);
}
.qa-card-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}
.qa-card-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.qa-tag {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    background: rgba(139,92,246,0.1);
    color: #a78bfa;
    font-weight: 500;
}

/* Article View */
.qa-back {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 20px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
}
.qa-back:hover { color: var(--accent); border-color: var(--accent); }

.qa-article {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}
.qa-article-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
}
.qa-article h2 {
    font-size: 22px;
    margin-bottom: 24px;
}
.qa-article-body h4 { font-size: 15px; font-weight: 700; margin: 20px 0 8px; color: var(--text); }
.qa-article-body p { margin-bottom: 12px; font-size: 14px; line-height: 1.8; }
.qa-article-body code {
    background: rgba(59,130,246,0.15);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--accent);
}

/* YouTube embed */
.qa-youtube {
    margin: 16px 0;
    text-align: center;
}
.qa-youtube iframe {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

/* Divider */
.qa-divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}

/* Share button */
.qa-share {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    text-align: center;
}
.qa-share-btn {
    background: var(--accent-glow);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: var(--radius-sm);
    padding: 10px 20px;
    color: var(--accent);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
}
.qa-share-btn:hover {
    background: var(--accent);
    color: white;
}

/* ═══════ FOOTER ═══════ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
    margin-top: 40px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}
.footer-brand { font-weight: 700; font-size: 16px; margin-bottom: 8px; }
.footer-desc { color: var(--text-muted); font-size: 13px; }
.footer h4 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 12px; color: var(--text-muted); }
.footer ul { list-style: none; }
.footer li { margin-bottom: 8px; font-size: 14px; }
.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-dim);
}

/* ═══════ ANIMATIONS ═══════ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ═══════ RESPONSIVE ═══════ */
@media (max-width: 768px) {
    .hero { padding: 50px 0 30px; }
    .hero h1 { font-size: 2rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .timeline-item { flex-direction: column; align-items: flex-start; gap: 4px; }
    .flow-diagram { flex-direction: column; }
    .flow-arrow { transform: rotate(90deg); }
    .info-table { font-size: 12px; }
    .info-table th, .info-table td { padding: 8px 10px; }
}

/* ═══════ PRINT ═══════ */
@media print {
    body { background: white; color: #222; }
    .hero-bg, .deadline-banner, .section-nav, .code-search, .hero-badges, .footer { display: none; }
    .article-card, .faq-item { border: 1px solid #ddd; }
    .article-body { max-height: none !important; padding: 0 16px 16px !important; }
    .faq-answer { max-height: none !important; padding: 0 16px 12px !important; }
    a { color: #3b82f6; }
}