/* Root Variables & Premium Color Palette */
:root {
    --bg-dark: #0f111a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
    --secondary-gradient: linear-gradient(135deg, #10b981, #3b82f6);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --input-bg: rgba(15, 17, 26, 0.6);
    --font-main: 'Outfit', sans-serif;
    --transition-fast: 0.2s ease;
}

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

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

/* Background Blobs for Aesthetics */
.blob {
    position: absolute;
    filter: blur(80px);
    z-index: -1;
    border-radius: 50%;
    animation: float 10s infinite alternate;
}

.blob-1 { top: -100px; left: -100px; width: 400px; height: 400px; background: rgba(99, 102, 241, 0.3); }
.blob-2 { bottom: -100px; right: -100px; width: 500px; height: 500px; background: rgba(139, 92, 246, 0.3); animation-delay: 2s; }
.blob-3 { top: 40%; left: 50%; transform: translate(-50%, -50%); width: 300px; height: 300px; background: rgba(16, 185, 129, 0.2); animation-delay: 4s; }

@keyframes float {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(30px) scale(1.05); }
}

/* Typography & Utilities */
h1, h2, h3, h4 { font-weight: 700; margin-bottom: 0.5rem; }
.subtitle { color: var(--text-secondary); margin-bottom: 2rem; }
.gradient-text { background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hidden { display: none !important; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.w-100 { width: 100%; }

/* Glassmorphism Classes */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* Navbar */
.glass-navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background: rgba(15, 17, 26, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}
.btn-primary { background: var(--primary-gradient); color: white; }
.btn-primary:hover { box-shadow: 0 0 15px rgba(99, 102, 241, 0.6); transform: translateY(-2px); }
.btn-secondary { background: var(--secondary-gradient); color: white; }
.btn-secondary:hover { box-shadow: 0 0 15px rgba(16, 185, 129, 0.6); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--text-primary); border: 1px solid var(--glass-border); }
.btn-ghost:hover { background: var(--glass-bg); }
.btn-large { padding: 1rem 2rem; font-size: 1.1rem; }
.btn-small { padding: 0.4rem 0.8rem; font-size: 0.85rem; }

/* Inputs */
.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; margin-bottom: 0.5rem; color: var(--text-secondary); font-size: 0.9rem; }
.input-group input, .input-group textarea, .input-group select {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    transition: var(--transition-fast);
}
.input-group input:focus, .input-group textarea:focus, .input-group select:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* App Container */
#app { padding: 2rem 5%; max-width: 1400px; margin: 0 auto; }
.view { animation: fadeIn 0.4s ease forwards; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Auth Section */
.auth-container { max-width: 450px; margin: 3rem auto; }
.role-selector { display: flex; gap: 1rem; margin-bottom: 2rem; }
.role-btn {
    flex: 1; background: transparent; color: var(--text-secondary); border: 1px solid var(--glass-border);
    padding: 0.8rem; border-radius: 8px; cursor: pointer; font-weight: 600; transition: var(--transition-fast);
}
.role-btn.active { background: var(--glass-bg); color: var(--text-primary); border-color: #6366f1; }

/* Dashboard Sections */
.dashboard-header { margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid var(--glass-border); }

/* Grid systems */
.course-grid, .admin-grid { display: grid; gap: 2rem; }
.course-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.admin-grid { grid-template-columns: 1fr 1fr; }
@media (max-width: 900px) { .admin-grid, .learning-layout { flex-direction: column; } .learning-main, .learning-sidebar { width: 100%; } }

/* Course Cards (Udemy style) */
.course-card { cursor: pointer; transition: var(--transition-fast); border: 1px solid var(--glass-border); padding: 1rem; border-radius: 12px; background: rgba(255,255,255,0.02); }
.course-card:hover { transform: translateY(-5px); border-color: rgba(99, 102, 241, 0.5); background: rgba(255,255,255,0.05); }
.course-thumb { width: 100%; height: 160px; background: #1e293b; border-radius: 8px; margin-bottom: 1rem; display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; background-size: cover; background-position: center; border: 1px solid rgba(255,255,255,0.1); }
.course-thumb::after { content: "▶"; position: absolute; font-size: 2rem; color: rgba(255, 255, 255, 0.8); background: rgba(0, 0, 0, 0.5); width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; border-radius: 50%; backdrop-filter: blur(4px); }
.course-category { font-size: 0.75rem; background: rgba(99,102,241,0.2); color: #818cf8; padding: 2px 8px; border-radius: 12px; display: inline-block; margin-bottom: 0.5rem; text-transform: uppercase; font-weight: 600; }

/* Progress Bar */
.progress-wrapper { margin-top: 1rem; }
.progress-text { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 4px; }
.progress-bar { width: 100%; height: 6px; background: rgba(255,255,255,0.1); border-radius: 4px; overflow: hidden; }
.progress-fill { height: 100%; background: #10b981; width: 0%; transition: width 0.5s ease; box-shadow: 0 0 10px rgba(16,185,129,0.5); }

/* Learning Player Interface (Udemy style split-pane) */
.learning-layout { display: flex; gap: 1.5rem; margin-top: 1rem; height: 75vh; }
.learning-main { flex: 7; display: flex; flex-direction: column; background: #000; border-radius: 12px; overflow: hidden; border: 1px solid var(--glass-border); box-shadow: 0 10px 40px rgba(0,0,0,0.5); }
.learning-sidebar { flex: 3; background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 12px; display: flex; flex-direction: column; overflow: hidden; }

.video-wrapper { flex: 1; background: #000; display: flex; justify-content: center; align-items: center; position: relative; }
.video-wrapper video { width: 100%; height: 100%; object-fit: contain; }

.learning-sidebar-header { padding: 1.5rem; border-bottom: 1px solid var(--glass-border); background: rgba(0,0,0,0.2); }
.learning-sidebar-content { flex: 1; overflow-y: auto; }

.lecture-item { display: flex; align-items: center; gap: 10px; padding: 1rem 1.5rem; border-bottom: 1px solid rgba(255,255,255,0.05); cursor: pointer; transition: background 0.2s; }
.lecture-item:hover { background: rgba(255,255,255,0.03); }
.lecture-item.active { background: rgba(99, 102, 241, 0.15); border-left: 3px solid #8b5cf6; }
.lecture-icon { color: var(--text-secondary); }
.lecture-title { flex: 1; font-size: 0.95rem; }
.lecture-check { color: #10b981; font-size: 1.2rem; opacity: 0; transition: 0.2s; }
.lecture-item.completed .lecture-check { opacity: 1; }

/* Admin Builders */
.builder-section { background: rgba(0,0,0,0.2); padding: 1.5rem; border-radius: 12px; border: 1px dashed rgba(255,255,255,0.2); margin-top: 1rem; }
.admin-video-item { background: rgba(255, 255, 255, 0.02); border: 1px solid var(--glass-border); border-radius: 8px; padding: 1rem; margin-bottom: 1rem; display: flex; justify-content: space-between; align-items: center; }