:root {
    --bg: #030D1A;
    --bg-glass: rgba(255, 255, 255, 0.04);
    --accent: #00BCD4;
    --accent-glow: rgba(0, 188, 212, 0.3);
    --accent-dim: #0097A7;
    --text-primary: #E8F4F8;
    --text-secondary: #7A9BAF;
    --text-dim: #3A5468;
    --border: rgba(0, 188, 212, 0.12);
    --border-hover: rgba(0, 188, 212, 0.45);
    --success: #00E676;
    --font-head: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --radius: 14px;
    --radius-sm: 8px;
    --ease: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background */
.bg-orb {
    position: fixed; border-radius: 50%; filter: blur(130px);
    pointer-events: none; z-index: 0; animation: orbFloat 14s ease-in-out infinite;
}
.bg-orb-1 { width: 700px; height: 700px; background: radial-gradient(circle, rgba(0,188,212,0.07) 0%, transparent 70%); top: -250px; left: -150px; }
.bg-orb-2 { width: 500px; height: 500px; background: radial-gradient(circle, rgba(0,80,160,0.07) 0%, transparent 70%); bottom: -100px; right: -100px; animation-delay: -5s; }
.bg-orb-3 { width: 350px; height: 350px; background: radial-gradient(circle, rgba(0,188,212,0.04) 0%, transparent 70%); top: 50%; left: 50%; transform: translate(-50%,-50%); animation-delay: -9s; }
.bg-grid {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-image: linear-gradient(rgba(0,188,212,0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(0,188,212,0.025) 1px, transparent 1px);
    background-size: 64px 64px; pointer-events: none; z-index: 0;
}
@keyframes orbFloat { 0%, 100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-40px) scale(1.05); } }

/* Layer */
header, section, footer { position: relative; z-index: 1; }

/* Header */
.site-header {
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px);
    background: rgba(3,13,26,0.85);
    position: sticky; top: 0; z-index: 100;
}
.header-inner {
    max-width: 1400px; margin: 0 auto;
    padding: 16px 40px;
    display: flex; justify-content: space-between; align-items: center;
}
.logo-group { display: flex; align-items: center; gap: 14px; }
.logo-icon {
    width: 44px; height: 44px;
    background: rgba(0,188,212,0.08); border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
}
.logo-text { display: flex; flex-direction: column; }
.logo-name { font-family: var(--font-head); font-size: 15px; font-weight: 700; color: var(--accent); letter-spacing: 3px; text-shadow: 0 0 15px var(--accent-glow); }
.logo-sub { font-size: 10px; color: var(--text-secondary); letter-spacing: 1.5px; text-transform: uppercase; margin-top: 3px; }
.header-status {
    display: flex; align-items: center; gap: 8px;
    background: rgba(0,230,118,0.07); border: 1px solid rgba(0,230,118,0.2);
    border-radius: 100px; padding: 6px 14px;
}
.status-dot { width: 7px; height: 7px; background: var(--success); border-radius: 50%; box-shadow: 0 0 6px var(--success); animation: pulseDot 2s ease-in-out infinite; }
.status-text { font-size: 10px; color: var(--success); letter-spacing: 1.5px; font-weight: 600; text-transform: uppercase; }
@keyframes pulseDot { 0%,100% { opacity:1; box-shadow: 0 0 6px var(--success); } 50% { opacity:.5; box-shadow: 0 0 14px var(--success); } }

/* Hero */
.hero { padding: 90px 40px 70px; text-align: center; max-width: 880px; margin: 0 auto; }
.hero-badge {
    display: inline-block; background: rgba(0,188,212,0.1); border: 1px solid var(--border);
    color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: 3px;
    text-transform: uppercase; padding: 6px 20px; border-radius: 100px;
    margin-bottom: 32px; font-family: var(--font-head);
}
.hero-title { font-family: var(--font-head); font-size: clamp(26px,5vw,50px); font-weight: 900; line-height: 1.25; margin-bottom: 16px; letter-spacing: 2px; }
.hero-title-accent { color: var(--accent); text-shadow: 0 0 35px var(--accent-glow); }
.hero-subtitle { font-size: 13px; color: var(--text-secondary); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 20px; font-weight: 500; }
.hero-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.85; margin-bottom: 50px; }
.hero-desc strong { color: var(--accent); font-weight: 600; }
.hero-stats {
    display: flex; justify-content: center; align-items: center;
    background: var(--bg-glass); border: 1px solid var(--border);
    border-radius: var(--radius); backdrop-filter: blur(10px);
    max-width: 460px; margin: 0 auto; overflow: hidden;
}
.stat-item { flex: 1; padding: 22px 16px; text-align: center; }
.stat-number { display: block; font-family: var(--font-head); font-size: 34px; font-weight: 700; color: var(--accent); text-shadow: 0 0 20px var(--accent-glow); }
.stat-label { display: block; font-size: 10px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1.5px; margin-top: 5px; }
.stat-divider { width: 1px; height: 50px; background: var(--border); }

/* Courses Section */
.courses-section { max-width: 1400px; margin: 0 auto; padding: 20px 40px 100px; }
.section-header { display: flex; align-items: center; gap: 20px; margin-bottom: 40px; }
.section-title { font-family: var(--font-head); font-size: 11px; color: var(--accent); letter-spacing: 4px; white-space: nowrap; }
.section-line { flex: 1; height: 1px; background: linear-gradient(to right, var(--border), transparent); }
.courses-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }

/* Course Card */
.course-card {
    background: var(--bg-glass); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 26px;
    cursor: pointer; transition: var(--ease);
    backdrop-filter: blur(10px); position: relative; overflow: hidden;
    text-decoration: none; display: block;
    animation: fadeUp 0.5s ease forwards; opacity: 0;
}
.course-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(to right, var(--accent), var(--accent-dim), transparent);
    opacity: 0; transition: var(--ease);
}
.course-card:hover { border-color: var(--border-hover); transform: translateY(-5px); box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 30px rgba(0,188,212,0.08); }
.course-card:hover::before { opacity: 1; }

.card-header { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 20px; }
.card-icon { width: 50px; height: 50px; background: rgba(0,188,212,0.1); border: 1px solid var(--border); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; transition: var(--ease); }
.course-card:hover .card-icon { background: rgba(0,188,212,0.2); border-color: var(--accent); box-shadow: 0 0 14px var(--accent-glow); }
.card-index { font-family: var(--font-head); font-size: 9px; color: var(--text-dim); letter-spacing: 2px; margin-bottom: 6px; }
.card-title { font-size: 15px; font-weight: 600; color: var(--text-primary); line-height: 1.4; }

.card-availability { margin-top: 16px; }
.avail-label { font-size: 10px; color: var(--text-dim); margin-bottom: 8px; letter-spacing: 1px; text-transform: uppercase; }
.avail-bar { height: 3px; background: rgba(255,255,255,0.05); border-radius: 100px; overflow: hidden; margin-bottom: 7px; }
.avail-fill { height: 100%; background: linear-gradient(to right, var(--accent-dim), var(--accent)); border-radius: 100px; box-shadow: 0 0 8px var(--accent-glow); transition: width 0.8s ease; }
.avail-text { font-size: 12px; color: var(--accent); font-weight: 600; }
.avail-pending { color: var(--text-dim); }

.card-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.card-action { font-size: 12px; color: var(--accent); font-weight: 600; letter-spacing: 1px; display: flex; align-items: center; gap: 6px; }
.card-arrow { transition: transform 0.3s ease; }
.course-card:hover .card-arrow { transform: translateX(5px); }
.card-badge { font-family: var(--font-head); font-size: 9px; background: rgba(0,188,212,0.1); border: 1px solid var(--border); color: var(--text-secondary); padding: 4px 10px; border-radius: 100px; letter-spacing: 1px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 30px 40px; text-align: center; background: rgba(3,13,26,0.6); backdrop-filter: blur(10px); }
.footer-inner { max-width: 1400px; margin: 0 auto; display: flex; flex-direction: column; gap: 8px; }
.footer-logo { font-family: var(--font-head); font-size: 14px; font-weight: 700; color: var(--accent); letter-spacing: 4px; text-shadow: 0 0 15px var(--accent-glow); }
.footer-copy { font-size: 12px; color: var(--text-secondary); }
.footer-system { font-size: 10px; color: var(--text-dim); letter-spacing: 2px; }

/* Session Page */
.page-header { max-width: 1000px; margin: 0 auto; padding: 50px 40px 30px; }
.back-link { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: 1px; text-decoration: none; margin-bottom: 32px; transition: var(--ease); }
.back-link:hover { gap: 12px; }
.course-hero-title { font-family: var(--font-head); font-size: clamp(22px,4vw,36px); font-weight: 900; margin-bottom: 10px; }
.course-hero-sub { font-size: 13px; color: var(--text-secondary); letter-spacing: 2px; text-transform: uppercase; }

.sessions-section { max-width: 1000px; margin: 0 auto; padding: 20px 40px 100px; }
.sessions-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }

.session-card {
    background: var(--bg-glass); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 20px;
    transition: var(--ease); position: relative;
    animation: fadeUp 0.4s ease forwards; opacity: 0;
}
.session-card.available { cursor: pointer; text-decoration: none; display: block; }
.session-card.available:hover { border-color: var(--border-hover); transform: translateY(-3px); box-shadow: 0 12px 40px rgba(0,0,0,0.3); }
.session-card.locked { opacity: 0.5; cursor: default; }
.session-card.exam { border-color: rgba(255,179,0,0.2); background: rgba(255,179,0,0.03); }

.session-num { font-family: var(--font-head); font-size: 10px; color: var(--text-dim); letter-spacing: 2px; margin-bottom: 8px; }
.session-title { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 14px; }
.session-tag { display: inline-block; font-size: 10px; font-weight: 600; letter-spacing: 1.5px; padding: 3px 10px; border-radius: 100px; text-transform: uppercase; }
.tag-available { background: rgba(0,188,212,0.1); color: var(--accent); border: 1px solid rgba(0,188,212,0.2); }
.tag-pending { background: rgba(58,84,104,0.3); color: var(--text-dim); border: 1px solid var(--border); }
.tag-exam { background: rgba(255,179,0,0.1); color: #FFB300; border: 1px solid rgba(255,179,0,0.2); }

/* Auth Section */
.auth-section { max-width: 520px; margin: 0 auto; padding: 60px 20px 100px; }
.auth-card { background: var(--bg-glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; backdrop-filter: blur(10px); animation: fadeUp 0.5s ease forwards; }
.auth-header { margin-bottom: 30px; }
.auth-title { font-family: var(--font-head); font-size: 22px; font-weight: 700; color: var(--accent); margin-bottom: 8px; letter-spacing: 1px; }
.auth-subtitle { font-size: 13px; color: var(--text-secondary); }
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 11px; color: var(--text-secondary); letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 6px; font-weight: 600; }
.form-input { width: 100%; padding: 12px 16px; background: rgba(255,255,255,0.04); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-primary); font-family: var(--font-body); font-size: 14px; transition: var(--ease); outline: none; }
.form-input:focus { border-color: var(--accent); box-shadow: 0 0 12px var(--accent-glow); }
.form-input::placeholder { color: var(--text-dim); }
.form-hint { display: block; font-size: 11px; color: #FFB300; margin-top: 5px; }
.form-error { color: #FF5252; font-size: 12px; margin-bottom: 14px; min-height: 18px; }
.form-btn { width: 100%; padding: 14px; background: linear-gradient(135deg, var(--accent-dim), var(--accent)); border: none; border-radius: var(--radius-sm); color: var(--bg); font-family: var(--font-head); font-size: 12px; font-weight: 700; letter-spacing: 2px; cursor: pointer; transition: var(--ease); text-transform: uppercase; text-align: center; text-decoration: none; display: block; }
.form-btn:hover { box-shadow: 0 0 20px var(--accent-glow); transform: translateY(-2px); }
.wa-btn { background: linear-gradient(135deg, #075E54, #128C7E); color: #fff; }
.wa-btn:hover { box-shadow: 0 0 20px rgba(18,140,126,0.4); }
.auth-switch { text-align: center; margin-top: 24px; font-size: 13px; color: var(--text-dim); }
.auth-switch a { color: var(--accent); text-decoration: none; font-weight: 600; }
.auth-switch a:hover { text-decoration: underline; }
.course-checkboxes { display: flex; flex-direction: column; gap: 8px; }
.checkbox-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); cursor: pointer; padding: 6px 10px; border-radius: var(--radius-sm); transition: var(--ease); }
.checkbox-item:hover { background: rgba(0,188,212,0.05); }
.checkbox-item input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.pending-steps { display: flex; flex-direction: column; gap: 16px; margin: 30px 0; }
.pending-step { display: flex; gap: 16px; align-items: flex-start; }
.step-num { width: 32px; height: 32px; background: rgba(0,188,212,0.1); border: 1px solid var(--border); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-family: var(--font-head); font-size: 12px; color: var(--accent); flex-shrink: 0; }
.step-text strong { display: block; color: var(--text-primary); font-size: 14px; margin-bottom: 4px; }
.step-text p { color: var(--text-secondary); font-size: 12px; line-height: 1.5; }

/* Admin Dashboard */
.admin-container { max-width: 1400px; margin: 0 auto; padding: 40px; }
.admin-header-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }
.admin-main-title { font-family: var(--font-head); font-size: 18px; color: var(--accent); letter-spacing: 2px; }
.admin-logout-btn { padding: 8px 20px; background: transparent; border: 1px solid rgba(255,82,82,0.3); color: #FF5252; border-radius: var(--radius-sm); font-size: 12px; cursor: pointer; transition: var(--ease); }
.admin-logout-btn:hover { background: rgba(255,82,82,0.1); }
.admin-stats { display: flex; gap: 18px; margin-bottom: 30px; }
.admin-stat-card { flex: 1; background: var(--bg-glass); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; text-align: center; }
.admin-stat-num { display: block; font-family: var(--font-head); font-size: 32px; font-weight: 700; color: var(--accent); }
.admin-stat-label { display: block; font-size: 10px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1.5px; margin-top: 4px; }
.admin-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.admin-tab { padding: 8px 18px; background: var(--bg-glass); border: 1px solid var(--border); color: var(--text-secondary); border-radius: 100px; font-size: 12px; cursor: pointer; transition: var(--ease); }
.admin-tab.active, .admin-tab:hover { background: rgba(0,188,212,0.1); border-color: var(--accent); color: var(--accent); }
.admin-table-wrap { background: var(--bg-glass); border: 1px solid var(--border); border-radius: var(--radius); overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th { font-family: var(--font-head); font-size: 9px; color: var(--text-dim); letter-spacing: 2px; text-transform: uppercase; text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.admin-table td { font-size: 13px; padding: 14px 16px; border-bottom: 1px solid rgba(0,188,212,0.05); color: var(--text-secondary); }
.admin-table tr:hover td { background: rgba(0,188,212,0.02); }
.courses-cell { font-size: 11px; max-width: 180px; }
.wa-link { color: var(--success); text-decoration: none; font-weight: 600; }
.wa-link:hover { text-decoration: underline; }
.status-badge { font-size: 10px; font-weight: 600; padding: 4px 10px; border-radius: 100px; letter-spacing: 1px; }
.badge-pending { background: rgba(255,179,0,0.1); color: #FFB300; border: 1px solid rgba(255,179,0,0.2); }
.badge-approved { background: rgba(0,230,118,0.1); color: var(--success); border: 1px solid rgba(0,230,118,0.2); }
.action-cell { white-space: nowrap; }
.action-btn { padding: 6px 14px; border: none; border-radius: var(--radius-sm); font-size: 11px; font-weight: 600; cursor: pointer; transition: var(--ease); margin-right: 6px; }
.approve-btn { background: rgba(0,230,118,0.15); color: var(--success); }
.approve-btn:hover { background: rgba(0,230,118,0.3); }
.reject-btn { background: rgba(255,82,82,0.15); color: #FF5252; }
.reject-btn:hover { background: rgba(255,82,82,0.3); }
.admin-empty { text-align: center; padding: 50px; color: var(--text-dim); font-size: 14px; }

/* Animations */
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

/* Responsive */
@media (max-width: 768px) {
    .header-inner { padding: 14px 20px; }
    .hero { padding: 60px 20px 50px; }
    .courses-section, .sessions-section, .page-header { padding-left: 20px; padding-right: 20px; }
    .courses-grid, .sessions-grid { grid-template-columns: 1fr; }
    .admin-stats { flex-direction: column; }
    .admin-container { padding: 20px; }
}