:root {
    --bg-primary: #0A0E17;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(56, 189, 248, 0.3);
    --text-main: #F3F4F6;
    --text-muted: #9CA3AF;
    --accent-blue: #38BDF8;
    --accent-indigo: #818CF8;
    --accent-amber: #F59E0B;
    --accent-emerald: #10B981;
    --gradient-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.15) 0%, transparent 70%);
}

html {
    scroll-behavior: smooth;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: var(--gradient-glow);
    background-attachment: fixed;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Nav */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.85rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s, transform 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent-blue);
}

/* Hero Section */
.hero {
    padding: 5rem 0 3.5rem;
    text-align: center;
    position: relative;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.9rem;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: 9999px;
    color: var(--accent-blue);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    letter-spacing: -0.5px;
}

.gradient-text {
    background: linear-gradient(135deg, #38BDF8 0%, #818CF8 50%, #C084FC 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 750px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    color: #fff;
    box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-blue);
}

/* Stats Counter */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.stat-item h3 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--accent-blue);
    margin-bottom: 0.25rem;
}

.stat-item {
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.stat-item:hover {
    transform: translateY(-3px);
}

.stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Sections */
.section {
    padding: 5rem 0;
    border-top: 1px solid var(--border-color);
    scroll-margin-top: 90px;
}

.hero {
    scroll-margin-top: 90px;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem;
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Cards & Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.75rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.25s ease;
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.card-lab-featured {
    border-color: rgba(56, 189, 248, 0.35);
    background: linear-gradient(180deg, rgba(17, 24, 39, 0.85) 0%, rgba(15, 23, 42, 0.95) 100%);
    box-shadow: 0 4px 20px rgba(56, 189, 248, 0.08);
}

.card-tag {
    align-self: flex-start;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1rem;
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent-blue);
    border: 1px solid rgba(56, 189, 248, 0.2);
}

.card-tag.lab-tag {
    background: rgba(56, 189, 248, 0.18);
    color: #38BDF8;
    border-color: rgba(56, 189, 248, 0.45);
    font-weight: 800;
}

.card-tag.interactive {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
    border-color: rgba(16, 185, 129, 0.3);
}

.card-tag.hotmart {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-amber);
    border-color: rgba(245, 158, 11, 0.3);
}

.card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
    flex-grow: 1;
}

.card-meta {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.card-actions .btn {
    flex: 1;
    justify-content: center;
    font-size: 0.85rem;
    padding: 0.6rem 1rem;
}

/* Category Filter Pills */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.filter-btn {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    padding: 0.4rem 1.1rem;
    font-size: 0.85rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.filter-btn:hover, .filter-btn.active {
    background: var(--accent-blue);
    color: #0A0E17;
    font-weight: 700;
    border-color: var(--accent-blue);
}

/* Audio Player Widget */
.podcast-player-card {
    background: linear-gradient(145deg, #131B2E, #0F172A);
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

.player-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.player-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
    background: linear-gradient(135deg, #F59E0B, #EF4444);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: #fff;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

.player-info h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.player-info p {
    color: var(--accent-blue);
    font-size: 0.9rem;
}

audio {
    width: 100%;
    outline: none;
    border-radius: 8px;
    filter: invert(1) hue-rotate(180deg);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 950px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    padding: 2rem;
}

.modal-close {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-main);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.modal-close:hover {
    background: rgba(239, 68, 68, 0.7);
}

/* Footer */
footer {
    background: #06090F;
    border-top: 1px solid var(--border-color);
    padding: 3.5rem 0 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer p {
    margin-bottom: 0.75rem;
}

.footer-credit {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.1rem; }
    .nav-links { display: none; }
    .cards-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}

/* Spotify & Enhancements */
:root {
    --spotify-green: #1DB954;
}

.spotify-card {
    background: linear-gradient(145deg, rgba(29, 185, 84, 0.08), rgba(17, 24, 39, 0.85));
    border: 1px solid rgba(29, 185, 84, 0.25);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.25s ease;
}

.spotify-card:hover {
    border-color: var(--spotify-green);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(29, 185, 84, 0.2);
}

.btn-spotify {
    background: #1DB954;
    color: #000;
    font-weight: 700;
    box-shadow: 0 4px 14px rgba(29, 185, 84, 0.35);
}

.btn-spotify:hover {
    background: #1ed760;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(29, 185, 84, 0.5);
}

/* Visitor Counter Pill */
.counter-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.85rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.counter-pill strong {
    color: var(--accent-blue);
    font-family: monospace;
    font-size: 0.95rem;
}

/* Student Banner & Unlocking */
.student-banner {
    background: linear-gradient(135deg, rgba(129, 140, 248, 0.15), rgba(56, 189, 248, 0.15));
    border: 1px solid rgba(129, 140, 248, 0.3);
    border-radius: 14px;
    padding: 1.25rem 1.75rem;
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.code-input-group {
    display: flex;
    gap: 0.5rem;
    width: 100%;
    max-width: 420px;
}

.code-input {
    flex: 1;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.65rem 1rem;
    color: #fff;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.code-input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.unlocked-tag {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-emerald);
    border: 1px solid rgba(16, 185, 129, 0.4);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
}