:root {
    --bg: #f6f6f6;
    --surface: #ffffff;
    --border: #d9d9d9;
    --border-soft: #e8e8e8;
    --text: #111111;
    --muted: #666666;
    --primary: #111111;
    --valid: #eaf7ef;
    --valid-border: #b8e0c7;
    --valid-text: #256548;
    --expired: #fff6e6;
    --expired-border: #f2d4a3;
    --expired-text: #8c5a11;
    --revoked: #fff0f0;
    --revoked-border: #ebbbbb;
    --revoked-text: #8f2f2f;
    --neutral: #f8f8f8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.5;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-shell, .reference-page { max-width: 1180px; margin: 0 auto; }
.site-main { padding: 32px 20px 72px; }
.site-header { background: var(--surface); border-bottom: 1px solid var(--border-soft); }
.site-header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.site-brand, .brand-link {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    font-weight: 700;
}
.brand-logo { width: 42px; height: 42px; object-fit: cover; border-radius: 10px; }
.site-nav, .admin-nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.site-nav a, .admin-nav a, .logout-button {
    color: var(--muted);
    font-size: 0.95rem;
}
.site-nav a:hover, .admin-nav a:hover, .logout-button:hover { color: var(--text); }
.site-footer { border-top: 1px solid var(--border-soft); background: var(--surface); }
.site-footer-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 24px 20px;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-section {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 32px;
    padding: 48px 0 24px;
    align-items: center;
}
.hero-copy h1, .reference-title, .reference-subtitle, .reference-section-title, .auth-card h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.02;
    font-weight: 800;
    margin: 8px 0 16px;
}
.hero-text, .prose-copy { max-width: 700px; font-size: 1.05rem; color: var(--muted); }
.hero-stat-card, .info-card, .step-card, .admin-panel, .metric-card, .auth-card, .certificate-sheet {
    background: var(--surface);
    border: 1px solid var(--border-soft);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}
.hero-stat-card { padding: 24px; min-height: 180px; display: grid; align-content: center; gap: 8px; }
.content-section { padding: 32px 0; }
.section-heading h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); margin: 6px 0 12px; }
.eyebrow { margin: 0; text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; color: var(--muted); font-weight: 700; }
.cards-section .info-grid, .steps-grid, .contact-grid, .dashboard-grid, .admin-panel-grid {
    display: grid;
    gap: 20px;
}
.info-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.steps-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.info-card, .step-card, .metric-card, .admin-panel { padding: 24px; }
.step-card span {
    display: inline-grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 999px;
    background: #111111;
    color: #ffffff;
    margin-bottom: 16px;
    font-weight: 700;
}
.split-section { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 24px; align-items: start; }

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: 12px 18px;
    font-weight: 700;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    cursor: pointer;
}
.button:hover { transform: translateY(-1px); }
.button-primary { background: var(--primary); color: #ffffff; border-color: var(--primary); }
.button-secondary, .button-search { background: var(--surface); color: var(--text); }
.full-width { width: 100%; }
.button-row, .quick-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.reference-body .site-header, .reference-body .site-footer { display: none; }
.reference-page { padding: 28px 20px 72px; }
.reference-title, .reference-subtitle, .reference-section-title {
    font-size: clamp(2rem, 4vw, 3.35rem);
    margin: 0 0 22px;
}
.reference-subtitle { margin-top: 36px; }
.reference-section-title { font-size: clamp(1.8rem, 3vw, 2.8rem); margin-top: 12px; }
.reference-panel {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: transparent;
    padding: 28px 24px 18px;
}
.search-form { max-width: 960px; }
.form-label { display: block; font-size: 1rem; margin-bottom: 10px; font-weight: 500; }
.form-input, .form-select, .form-textarea {
    width: 100%;
    border: 1px solid #cfcfcf;
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 1rem;
    background: #ffffff;
    color: var(--text);
}
.form-input:focus, .form-select:focus, .form-textarea:focus, .logout-button:focus, .button:focus {
    outline: 2px solid #111111;
    outline-offset: 2px;
}
.search-row {
    display: flex;
    gap: 12px;
    align-items: end;
    margin-top: 12px;
}
.search-col { flex: 1; }
.captcha-panel { margin-top: 16px; max-width: 360px; }

.table-wrap { overflow-x: auto; }
.certificate-table, .admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
}
.certificate-table th, .certificate-table td, .admin-table th, .admin-table td {
    border: 1px solid var(--border);
    padding: 14px 16px;
    text-align: left;
    vertical-align: top;
}
.certificate-table th { width: 230px; font-size: 1.02rem; }

.status {
    margin-top: 18px;
    border-radius: 14px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    display: grid;
    gap: 6px;
}
.status p { margin: 0; color: var(--muted); }
.status-valid { background: var(--valid); border-color: var(--valid-border); color: var(--valid-text); }
.status-expired { background: var(--expired); border-color: var(--expired-border); color: var(--expired-text); }
.status-revoked { background: var(--revoked); border-color: var(--revoked-border); color: var(--revoked-text); }
.status-neutral { background: var(--neutral); }
.compact { display: inline-flex; padding: 6px 10px; margin: 0; border-radius: 999px; font-size: 0.85rem; }

.admin-shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
.admin-sidebar {
    background: #111111;
    color: #ffffff;
    padding: 28px 20px;
    position: sticky;
    top: 0;
    height: 100vh;
}
.admin-sidebar .brand-link { color: #ffffff; margin-bottom: 24px; }
.admin-nav { flex-direction: column; align-items: flex-start; gap: 6px; }
.admin-nav a, .logout-button {
    color: rgba(255, 255, 255, 0.82);
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    background: transparent;
    border: 0;
    text-align: left;
}
.admin-nav a:hover, .logout-button:hover { background: rgba(255, 255, 255, 0.08); color: #ffffff; }
.logout-form { width: 100%; }
.admin-main { padding: 24px 24px 48px; }
.admin-topbar {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
    margin-bottom: 24px;
}
.admin-topbar h1 { margin: 6px 0 0; font-size: 2.1rem; }
.admin-user-card { background: var(--surface); border: 1px solid var(--border-soft); border-radius: 16px; padding: 14px 18px; display: grid; }
.dashboard-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); margin-bottom: 24px; }
.metric-card span { color: var(--muted); display: block; }
.metric-card strong { font-size: 2rem; margin-top: 12px; display: block; }
.admin-panel-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: 24px; }
.panel-heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 18px;
}
.panel-heading h2 { margin: 0; font-size: 1.35rem; }
.trend-list, .record-grid, .details-grid-form, .filters-grid { display: grid; gap: 16px; }
.trend-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-soft);
}
.record-grid, .details-grid-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.full-span { grid-column: 1 / -1; }
.filters-grid { grid-template-columns: repeat(7, minmax(0, 1fr)); }
.stack-form { display: grid; gap: 14px; }
.profile-form { max-width: 640px; }
.helper-text, .auth-note { color: var(--muted); font-size: 0.92rem; }
.validation-list {
    margin: 0;
    padding-left: 20px;
    display: grid;
    gap: 8px;
}
.import-errors {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-soft);
}
.pagination-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 20px;
}
.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 42px;
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
}
.pagination-link.is-active {
    background: #111111;
    color: #ffffff;
    border-color: #111111;
}
.table-link, .table-button {
    color: #0f4f8a;
    background: transparent;
    border: 0;
    padding: 0;
    font: inherit;
    cursor: pointer;
}
.table-button-danger { color: #a12b2b; }
.actions-cell, .inline-action { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.form-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.alert {
    border-radius: 14px;
    padding: 14px 16px;
    margin-bottom: 18px;
    border: 1px solid var(--border);
    background: var(--surface);
}
.alert-success { background: var(--valid); border-color: var(--valid-border); color: var(--valid-text); }
.alert-danger { background: var(--revoked); border-color: var(--revoked-border); color: var(--revoked-text); }
.alert-warning { background: var(--expired); border-color: var(--expired-border); color: var(--expired-text); }

.auth-section {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}
.auth-card { width: min(100%, 520px); padding: 32px; }

.certificate-view { padding: 28px 0 56px; }
.certificate-sheet { padding: 30px; }
.certificate-sheet-header {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: start;
    border-bottom: 1px solid var(--border-soft);
    padding-bottom: 20px;
    margin-bottom: 24px;
}
.certificate-sheet-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.certificate-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.qr-code { width: 180px; height: 180px; }
.qr-panel { display: grid; gap: 12px; justify-items: start; }

@media (max-width: 992px) {
    .hero-section, .split-section, .admin-panel-grid, .dashboard-grid, .info-grid, .steps-grid, .contact-grid, .record-grid, .details-grid-form, .certificate-sheet-grid {
        grid-template-columns: 1fr 1fr;
    }
    .filters-grid { grid-template-columns: 1fr 1fr 1fr; }
    .admin-shell { grid-template-columns: 1fr; }
    .admin-sidebar { position: static; height: auto; }
}

@media (max-width: 720px) {
    .site-header-inner, .site-footer-inner, .admin-topbar, .certificate-sheet-header, .search-row,
    .hero-section, .split-section, .admin-panel-grid, .dashboard-grid, .info-grid, .steps-grid,
    .contact-grid, .record-grid, .details-grid-form, .filters-grid, .certificate-sheet-grid {
        grid-template-columns: 1fr;
        display: grid;
    }
    .search-row { gap: 0; }
    .button, .button-search { width: 100%; margin-top: 12px; }
    .site-nav { width: 100%; justify-content: flex-start; }
    .reference-page { padding-inline: 16px; }
    .reference-panel { padding: 20px 16px 16px; }
    .certificate-table, .certificate-table tbody, .certificate-table tr, .certificate-table th, .certificate-table td {
        display: block;
        width: 100%;
    }
    .certificate-table tr { border-bottom: 1px solid var(--border); }
    .certificate-table th { border-bottom: 0; background: #fafafa; }
}

@media print {
    .site-header, .site-footer, .certificate-actions, .admin-sidebar, .admin-topbar { display: none !important; }
    body { background: #ffffff; }
    .certificate-sheet, .admin-panel { box-shadow: none; border-color: #dddddd; }
}