/* ═══════════════════════════════════════════
   TechTopia 2K26 — Design System
   SVV Senior Secondary School, Koothur, Trichy
   Colors matched to branding: Navy + Orange + Sky
   ═══════════════════════════════════════════ */

:root {
    --navy: #1a3a5c;
    --navy-dark: #0f2640;
    --orange: #e87722;
    --orange-light: #f5943a;
    --sky: #e8f4fd;
    --sky-mid: #bfe0f5;
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f0f2f5;
    --gray-200: #e2e5e9;
    --gray-300: #c4c9d0;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --green: #16a34a;
    --green-bg: #dcfce7;
    --red: #dc2626;
    --red-bg: #fee2e2;
    --yellow: #f59e0b;
    --yellow-bg: #fef3c7;

    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Poppins', sans-serif;
    --radius: 10px;
    --shadow: 0 2px 8px rgba(26,58,92,0.08);
    --shadow-lg: 0 8px 24px rgba(26,58,92,0.12);
}

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

body {
    font-family: var(--font-body);
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--orange); }

/* ─── Navbar ─────────────────────────── */
.navbar {
    background: var(--navy-dark);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    min-height: 56px;
}
.nav-brand {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--white) !important;
    display: flex;
    align-items: baseline;
    gap: 2px;
}
.brand-tech { color: var(--white); font-weight: 700; }
.brand-topia { color: var(--orange); font-weight: 700; }
.brand-year { font-size: 0.65rem; color: var(--sky-mid); margin-left: 4px; }
.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.nav-links a { color: var(--sky-mid); font-size: 0.85rem; font-weight: 500; }
.nav-links a:hover { color: var(--orange-light); }
.nav-user { color: var(--gray-300); font-size: 0.8rem; }
.nav-toggle { display: none; background: none; border: none; color: var(--white); font-size: 1.5rem; cursor: pointer; }

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--navy-dark);
        flex-direction: column;
        padding: 1rem;
        gap: 0.75rem;
    }
    .nav-links.open { display: flex; }
}

/* ─── Layout ─────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }
.container-narrow { max-width: 800px; margin: 0 auto; padding: 1.5rem; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 1.5rem; }

/* ─── Hero Section ───────────────────── */
.hero {
    background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 60%, #2a5a8c 100%);
    color: var(--white);
    padding: 3rem 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(ellipse, rgba(232,119,34,0.15) 0%, transparent 70%);
}
.hero-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 2px;
    margin-bottom: 0.25rem;
    position: relative;
}
.hero-title .orange { color: var(--orange); }
.hero-subtitle {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--sky-mid);
    margin-bottom: 0.5rem;
}
.hero-school {
    font-size: 0.95rem;
    color: var(--gray-300);
    margin-bottom: 1.5rem;
}
.hero-tagline {
    display: inline-block;
    background: rgba(232,119,34,0.2);
    border: 1px solid var(--orange);
    padding: 0.4rem 1.5rem;
    border-radius: 30px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--orange-light);
    margin-bottom: 1.5rem;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}
.hero-stat {
    text-align: center;
}
.hero-stat-num {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--orange);
}
.hero-stat-label {
    font-size: 0.8rem;
    color: var(--gray-300);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.hero-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--sky-mid);
    flex-wrap: wrap;
}
.hero-meta span { display: flex; align-items: center; gap: 0.3rem; }

@media (max-width: 600px) {
    .hero-title { font-size: 1.6rem; }
    .hero-stats { gap: 1rem; }
    .hero-stat-num { font-size: 1.5rem; }
}

/* ─── Cards ──────────────────────────── */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1rem;
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--gray-100);
}
.card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--navy);
}

/* ─── Stat Cards (Dashboard) ─────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--navy);
}
.stat-card.orange { border-left-color: var(--orange); }
.stat-card.green { border-left-color: var(--green); }
.stat-card.sky { border-left-color: var(--sky-mid); }
.stat-label { font-size: 0.8rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.5px; }
.stat-num {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--navy);
    margin-top: 0.25rem;
}
.stat-card.orange .stat-num { color: var(--orange); }
.stat-card.green .stat-num { color: var(--green); }

/* ─── Event Cards ────────────────────── */
.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}
.event-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    border-top: 4px solid var(--orange);
    transition: transform 0.2s, box-shadow 0.2s;
}
.event-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}
.event-card-num {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--orange);
    letter-spacing: 2px;
    margin-bottom: 0.25rem;
}
.event-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 0.5rem;
}
.event-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}
.event-tag {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.tag-class { background: var(--sky); color: var(--navy); }
.tag-duration { background: var(--yellow-bg); color: #92400e; }
.tag-team { background: var(--green-bg); color: #166534; }
.event-card-desc {
    font-size: 0.85rem;
    color: var(--gray-500);
    line-height: 1.5;
}

/* ─── Status Badges ──────────────────── */
.badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-pending { background: var(--yellow-bg); color: #92400e; }
.badge-approved { background: var(--green-bg); color: #166534; }
.badge-rejected { background: var(--red-bg); color: #991b1b; }
.badge-upcoming { background: var(--sky); color: var(--navy); }
.badge-live { background: var(--red); color: var(--white); animation: pulse 1.5s infinite; }
.badge-completed { background: var(--green-bg); color: #166534; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* ─── Tables ─────────────────────────── */
.table-wrap { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
th {
    background: var(--navy);
    color: var(--white);
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--gray-200);
}
tr:hover td { background: var(--sky); }

/* ─── Forms ──────────────────────────── */
.form-group { margin-bottom: 1rem; }
.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.3rem;
}
.form-input, .form-select {
    width: 100%;
    padding: 0.6rem 0.9rem;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-size: 0.9rem;
    font-family: var(--font-body);
    transition: border-color 0.2s;
}
.form-input:focus, .form-select:focus {
    outline: none;
    border-color: var(--orange);
}
.form-input-sm { padding: 0.4rem 0.6rem; font-size: 0.82rem; }
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}
.form-section {
    margin: 1.5rem 0;
    padding: 1.25rem;
    background: var(--gray-50);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}
.form-section-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--orange);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ─── Buttons ────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}
.btn-primary { background: var(--orange); color: var(--white); }
.btn-primary:hover { background: var(--orange-light); color: var(--white); }
.btn-navy { background: var(--navy); color: var(--white); }
.btn-navy:hover { background: var(--navy-dark); color: var(--white); }
.btn-green { background: var(--green); color: var(--white); }
.btn-green:hover { background: #15803d; color: var(--white); }
.btn-red { background: var(--red); color: var(--white); }
.btn-red:hover { background: #b91c1c; color: var(--white); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--gray-300);
    color: var(--gray-700);
}
.btn-outline:hover { border-color: var(--orange); color: var(--orange); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.78rem; }
.btn-lg { padding: 0.8rem 2rem; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }
.btn-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ─── Alerts ─────────────────────────── */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1rem;
}
.alert-success { background: var(--green-bg); color: #166534; border: 1px solid #86efac; }
.alert-error { background: var(--red-bg); color: #991b1b; border: 1px solid #fca5a5; }
.alert-warning { background: var(--yellow-bg); color: #92400e; border: 1px solid #fcd34d; }
.alert-info { background: var(--sky); color: var(--navy); border: 1px solid var(--sky-mid); }

/* ─── Section Headers ────────────────── */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}
.section-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--navy);
}
.page-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--navy);
    margin: 1rem 0;
}

/* ─── Filter Tabs ────────────────────── */
.filter-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.filter-tab {
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 2px solid var(--gray-200);
    background: var(--white);
    color: var(--gray-500);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}
.filter-tab:hover, .filter-tab.active {
    border-color: var(--orange);
    color: var(--orange);
    background: rgba(232,119,34,0.05);
}

/* ─── Registration Form Event Blocks ── */
.event-reg-block {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 0.75rem;
    transition: border-color 0.2s;
}
.event-reg-block:focus-within { border-color: var(--orange); }
.event-reg-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}
.event-reg-title {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--navy);
}
.participant-row {
    display: grid;
    grid-template-columns: auto 1fr 120px;
    gap: 0.5rem;
    align-items: center;
    margin-bottom: 0.4rem;
}
.participant-row .slot-num {
    font-size: 0.8rem;
    color: var(--gray-500);
    font-weight: 600;
    width: 20px;
}

/* ─── Success Page ───────────────────── */
.success-card {
    text-align: center;
    padding: 3rem 2rem;
    max-width: 500px;
    margin: 2rem auto;
}
.success-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.reg-id-display {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--orange);
    background: var(--sky);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    display: inline-block;
    margin: 1rem 0;
    letter-spacing: 2px;
}

/* ─── Footer ─────────────────────────── */
.footer {
    background: var(--navy-dark);
    color: var(--gray-300);
    text-align: center;
    padding: 1.25rem;
    font-size: 0.8rem;
    margin-top: 2rem;
}
.footer-sub { margin-top: 0.3rem; font-size: 0.7rem; }
.footer-sub a { color: var(--orange-light); }

/* ─── Live Display ───────────────────── */
.live-container {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--navy-dark) 0%, #0a1929 100%);
    color: var(--white);
    padding: 2rem;
    overflow: hidden;
}
.live-header {
    text-align: center;
    margin-bottom: 2rem;
}
.live-title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 4px;
}
.live-title .orange { color: var(--orange); }
.live-school {
    font-size: 1rem;
    color: var(--sky-mid);
    margin-top: 0.25rem;
}
.live-stats-row {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}
.live-stat {
    text-align: center;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 16px;
    padding: 1.5rem 2.5rem;
}
.live-stat-num {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--orange);
}
.live-stat-label {
    font-size: 0.85rem;
    color: var(--gray-300);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 0.25rem;
}
.live-events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}
.live-event-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    padding: 1.25rem;
    transition: all 0.3s;
}
.live-event-card.live {
    border-color: var(--orange);
    background: rgba(232,119,34,0.1);
    animation: glow 2s infinite;
}
.live-event-card.completed {
    opacity: 0.6;
}
@keyframes glow {
    0%, 100% { box-shadow: 0 0 10px rgba(232,119,34,0.2); }
    50% { box-shadow: 0 0 20px rgba(232,119,34,0.4); }
}
.live-event-name {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.3rem;
}
.live-event-meta {
    font-size: 0.8rem;
    color: var(--gray-300);
}
.live-event-count {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--orange);
    margin-top: 0.5rem;
}
.live-checkin-feed {
    margin-top: 2rem;
    text-align: center;
}
.live-checkin-title {
    font-size: 0.85rem;
    color: var(--gray-300);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.75rem;
}
.live-checkin-item {
    display: inline-block;
    background: rgba(22,163,74,0.15);
    border: 1px solid rgba(22,163,74,0.3);
    color: #86efac;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin: 0.25rem;
    font-weight: 500;
}
.live-timestamp {
    text-align: center;
    color: var(--gray-500);
    font-size: 0.75rem;
    margin-top: 2rem;
}

/* ─── Print Styles ───────────────────── */
@media print {
    .navbar, .footer, .btn, .no-print { display: none !important; }
    body { background: white; font-size: 11pt; }
    .card { box-shadow: none; border: 1px solid #ddd; }
    .container { max-width: 100%; padding: 0; }
}

/* ─── Print Event List ───────────────── */
.print-header {
    text-align: center;
    margin-bottom: 1.5rem;
    border-bottom: 3px solid var(--navy);
    padding-bottom: 1rem;
}
.print-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--navy);
}
.print-subtitle { font-size: 0.9rem; color: var(--gray-500); }

/* ─── Checkbox styling ───────────────── */
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.82rem;
    cursor: pointer;
    padding: 0.3rem 0.6rem;
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    transition: all 0.2s;
}
.checkbox-label:hover { border-color: var(--orange); }
.checkbox-label input:checked + span { color: var(--orange); font-weight: 600; }

/* ─── Misc ───────────────────────────── */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--gray-500); }
.text-sm { font-size: 0.82rem; }
.text-orange { color: var(--orange); }
.text-navy { color: var(--navy); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: 0.5rem; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.inline-form { display: inline-flex; align-items: center; gap: 0.5rem; }
.hidden { display: none; }