/* ===== GLOBAL STYLES ===== */
:root {
    --primary: #3a5df5;
    --primary-dark: #2947c7;
    --primary-light: #6c8aff;
    --secondary: #ff7b4a;
    --accent: #8d4af2;
    --success: #2acf8b;
    --warning: #ffb443;
    --danger: #ff5e7c;
    --dark: #0b1a33;
    --gray-800: #1e293b;
    --gray-600: #475569;
    --gray-400: #94a3b8;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --white: #ffffff;
    --shadow-sm: 0 4px 6px -1px rgba(0,0,0,0.05);
    --shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
    --shadow-lg: 0 25px 50px -12px rgba(0,0,0,0.15);
    --radius: 32px;
    --radius-sm: 20px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--dark);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: 3.5rem; line-height: 1.1; }
h2 { font-size: 2.5rem; margin-bottom: 1.2rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 36px;
    border-radius: 60px;
    font-weight: 600;
    font-size: 1.05rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    background: var(--white);
    color: var(--dark);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(145deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 12px 28px rgba(58, 93, 245, 0.25);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 35px rgba(58, 93, 245, 0.35);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--gray-200);
    color: var(--dark);
}

.btn-outline:hover {
    border-color: var(--primary);
    background: rgba(58, 93, 245, 0.04);
}

.btn-small {
    padding: 10px 24px;
    font-size: 0.95rem;
}

/* ===== NAVIGATION ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 40px;
    max-width: 1440px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--dark);
    text-decoration: none;
}

.logo i {
    color: var(--primary);
    font-size: 2.2rem;
}

.nav-links {
    display: flex;
    gap: 48px;
    font-weight: 600;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-600);
    transition: var(--transition);
}

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

/* ===== COURSE CARDS ===== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.course-card {
    background: white;
    border-radius: var(--radius-sm);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.course-icon {
    font-size: 2.8rem;
    color: var(--primary);
    margin-bottom: 24px;
}

.course-meta {
    display: flex;
    gap: 20px;
    margin-top: 24px;
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ===== PROGRESS ===== */
.progress-container {
    width: 100%;
    height: 10px;
    background: var(--gray-200);
    border-radius: 60px;
    margin: 16px 0;
}

.progress-fill {
    height: 10px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 60px;
    transition: width 0.3s ease;
}

/* ===== DASHBOARD ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.stat-card {
    background: white;
    padding: 28px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
}

/* ===== FOOTER ===== */
footer {
    background: var(--dark);
    color: white;
    padding: 80px 40px 40px;
    border-radius: 60px 60px 0 0;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    max-width: 1280px;
    margin: 0 auto;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    h1 { font-size: 2.8rem; }
    .nav-links { display: none; }
    .footer-grid { grid-template-columns: 1fr; }
}