/* ── ChainTrack -- Industrial Blue/Gray Theme ──────────────────────────── */

:root {
    --primary: #1a5276;
    --primary-light: #2980b9;
    --primary-dark: #0e2f44;
    --accent: #2ecc71;
    --accent-warn: #e74c3c;
    --accent-amber: #f39c12;
    --bg: #f0f3f6;
    --bg-card: #ffffff;
    --bg-dark: #1b2838;
    --text: #2c3e50;
    --text-light: #7f8c8d;
    --text-inverse: #ecf0f1;
    --border: #d5dce4;
    --border-light: #e8edf2;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
    --radius: 8px;
    --radius-sm: 4px;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Navbar ────────────────────────────────────────────────────────────── */

.navbar {
    background: var(--bg-dark);
    color: var(--text-inverse);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-inverse);
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.chain-icon { font-size: 1.5rem; }

.nav-links {
    display: flex;
    gap: 0.25rem;
}

.nav-link {
    color: var(--text-inverse);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    opacity: 0.8;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active { border-bottom: 2px solid var(--accent); }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-inverse);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ── Main Layout ───────────────────────────────────────────────────────── */

.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
}

/* ── Page Header ───────────────────────────────────────────────────────── */

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    color: var(--primary-dark);
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.05rem;
}

/* ── Cards ─────────────────────────────────────────────────────────────── */

.section-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-light);
}

.section-title {
    font-size: 1.2rem;
    color: var(--primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-light);
}

.section-desc {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.7;
}

/* ── Stats Grid ────────────────────────────────────────────────────────── */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--border-light);
    transition: transform var(--transition);
}

.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.stat-icon {
    font-size: 2rem;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.products-icon { background: #eaf2f8; }
.blocks-icon { background: #fef9e7; }
.shipments-icon { background: #fdf2e9; }
.integrity-icon { background: #eafaf1; }

.stat-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1.2;
}

.stat-label {
    display: block;
    color: var(--text-light);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.integrity-card .stat-value { color: var(--accent); }

/* ── Stage Bars ────────────────────────────────────────────────────────── */

.stage-bar-container { display: flex; flex-direction: column; gap: 0.75rem; }

.stage-bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 0.2rem;
}

.stage-count { font-weight: 600; color: var(--primary); }

.stage-bar {
    height: 8px;
    background: var(--border-light);
    border-radius: 4px;
    overflow: hidden;
}

.stage-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.6s ease;
    min-width: 2px;
}

.stage-manufactured { background: var(--primary); }
.stage-quality_check { background: #8e44ad; }
.stage-shipped { background: var(--accent-amber); }
.stage-customs { background: #e67e22; }
.stage-warehouse { background: var(--primary-light); }
.stage-out_for_delivery { background: #3498db; }
.stage-delivered { background: var(--accent); }

/* ── Data Table ────────────────────────────────────────────────────────── */

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th {
    background: var(--bg);
    color: var(--primary);
    font-weight: 600;
    text-align: left;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

.data-table td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.data-table tr:hover td { background: #f8fafc; }

.tracking-link {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.tracking-link:hover { text-decoration: underline; }

.hash-code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: var(--bg);
    padding: 0.15rem 0.4rem;
    border-radius: var(--radius-sm);
    color: var(--primary);
}

.timestamp { color: var(--text-light); font-size: 0.85rem; white-space: nowrap; }

/* ── Event Badges ──────────────────────────────────────────────────────── */

.event-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: capitalize;
    white-space: nowrap;
}

.badge-manufactured { background: #d4e6f1; color: #1a5276; }
.badge-quality_check { background: #e8daef; color: #6c3483; }
.badge-shipped { background: #fdebd0; color: #935116; }
.badge-customs { background: #fadbd8; color: #922b21; }
.badge-warehouse { background: #d5f5e3; color: #1e8449; }
.badge-out_for_delivery { background: #d6eaf8; color: #2471a3; }
.badge-delivered { background: #abebc6; color: #196f3d; }

/* ── Forms ─────────────────────────────────────────────────────────────── */

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text);
    margin-bottom: 0.3rem;
}

.form-input {
    width: 100%;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font);
    transition: border-color var(--transition);
    background: #fff;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.15);
}

.input-group {
    display: flex;
    gap: 0.5rem;
}

.input-group .form-input { flex: 1; }

/* ── Buttons ───────────────────────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover { background: var(--primary-light); }

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline:hover { background: var(--primary); color: white; }

.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8rem; }

/* ── Chain Visualization ───────────────────────────────────────────────── */

.chain-visualization {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1rem 0;
}

.chain-block {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    width: 100%;
    max-width: 520px;
    transition: var(--transition);
    position: relative;
}

.chain-block:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
}

.block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.block-index {
    font-weight: 700;
    color: var(--primary);
    font-size: 0.95rem;
}

.block-body { margin-bottom: 0.75rem; }

.block-field {
    display: flex;
    gap: 0.5rem;
    font-size: 0.85rem;
    padding: 0.15rem 0;
}

.field-label { color: var(--text-light); font-weight: 600; min-width: 70px; }
.field-value { color: var(--text); }

.block-hashes {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem;
}

.hash-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    padding: 0.15rem 0;
}

.hash-label {
    color: var(--text-light);
    font-weight: 600;
    min-width: 40px;
}

.hash-value {
    font-family: var(--font-mono);
    color: var(--primary);
    font-size: 0.78rem;
    word-break: break-all;
}

.current-hash { color: var(--accent); font-weight: 600; }

.chain-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.25rem 0;
    color: var(--primary-light);
}

.link-line {
    width: 3px;
    height: 16px;
    background: var(--primary-light);
    border-radius: 2px;
}

.link-arrow { font-size: 0.9rem; line-height: 1; margin-top: -4px; }

/* ── Timeline ──────────────────────────────────────────────────────────── */

.timeline {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 1rem 0;
    position: relative;
    overflow-x: auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 28px;
    right: 28px;
    height: 3px;
    background: var(--border);
    z-index: 0;
}

.timeline-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    z-index: 1;
    min-width: 80px;
    flex: 1;
}

.timeline-marker {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border-light);
    border: 3px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition);
}

.timeline-marker.completed {
    background: var(--accent);
    border-color: var(--accent);
}

.timeline-step.current .timeline-marker {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(26, 82, 118, 0.2);
}

.timeline-label {
    font-size: 0.75rem;
    text-align: center;
    color: var(--text-light);
    max-width: 90px;
}

/* ── Verification ──────────────────────────────────────────────────────── */

.verification-banner {
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.verification-banner.valid {
    background: #d5f5e3;
    color: #1e8449;
    border: 1px solid #abebc6;
}

.verification-banner.invalid {
    background: #fadbd8;
    color: #922b21;
    border: 1px solid #f1948a;
}

.verify-animation { text-align: center; padding: 1.5rem; }

.verify-progress {
    height: 6px;
    background: var(--border-light);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.verify-progress-bar {
    height: 100%;
    background: var(--primary-light);
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s ease;
}

.verify-status-text { color: var(--text-light); font-style: italic; }

.verify-details {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
}

/* ── Product Detail ────────────────────────────────────────────────────── */

.product-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
}

.product-info h2 { color: var(--primary-dark); margin-bottom: 0.5rem; }

.product-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

.current-stage { font-size: 0.95rem; }

.qr-thumb {
    width: 120px;
    height: 120px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
}

/* ── Modal ─────────────────────────────────────────────────────────────── */

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    text-align: center;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 0.5rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.qr-image {
    max-width: 250px;
    margin: 1rem auto;
    display: block;
    border: 2px solid var(--border);
    border-radius: var(--radius);
}

.qr-instructions { color: var(--text-light); font-size: 0.9rem; }

/* ── How It Works ──────────────────────────────────────────────────────── */

.how-it-works { display: flex; flex-direction: column; gap: 1.25rem; }

.how-step {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.how-step-number {
    width: 36px;
    height: 36px;
    min-width: 36px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
}

.how-step-content h3 {
    color: var(--primary-dark);
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

.how-step-content p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ── Features Grid ─────────────────────────────────────────────────────── */

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

.feature-card {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 1.25rem;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.feature-icon { font-size: 2rem; margin-bottom: 0.5rem; }

.feature-card h3 {
    color: var(--primary);
    margin-bottom: 0.4rem;
    font-size: 1rem;
}

.feature-card p { color: var(--text-light); font-size: 0.9rem; }

/* ── Tech Stack ────────────────────────────────────────────────────────── */

.tech-stack {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.75rem;
}

.tech-item {
    padding: 0.65rem 1rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

/* ── API Endpoints ─────────────────────────────────────────────────────── */

.api-endpoints { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 1rem; }

.endpoint {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
}

.method {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    min-width: 50px;
    text-align: center;
}

.method.get { background: #d5f5e3; color: #1e8449; }
.method.post { background: #d6eaf8; color: #2471a3; }

.path {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text);
}

.endpoint .desc { color: var(--text-light); }

/* ── Result Panel ──────────────────────────────────────────────────────── */

.result-panel {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.result-panel.success { border-color: var(--accent); background: #eafaf1; }
.result-panel.error { border-color: var(--accent-warn); background: #fdedec; }

/* ── Empty State ───────────────────────────────────────────────────────── */

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-light);
}

.empty-state h3 { color: var(--text); margin-bottom: 0.5rem; }
.empty-state a { color: var(--primary-light); }

/* ── Footer ────────────────────────────────────────────────────────────── */

.footer {
    background: var(--bg-dark);
    color: var(--text-inverse);
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
}

.footer p { font-size: 0.85rem; opacity: 0.8; }
.footer-tech { margin-top: 0.25rem; font-size: 0.8rem; opacity: 0.6; }

/* ── Responsive ────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
    .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--bg-dark); padding: 1rem; }
    .nav-links.open { display: flex; }
    .nav-toggle { display: block; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .product-header { flex-direction: column; }
    .timeline { gap: 0; }
    .timeline-label { font-size: 0.65rem; }
    .form-grid { grid-template-columns: 1fr; }
    .input-group { flex-direction: column; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .page-header h1 { font-size: 1.5rem; }
    .main-content { padding: 1rem; }
}