/* 
    VIONN EDU HUB - PREMIUM DESIGN SYSTEM (v4.0)
    Theme: Modern Educational Dashboard
    Main Color: #00a884 (VIONN Teal)
*/

:root {
    /* Color Palette */
    --vionn-teal: #00a884;
    --vionn-teal-dark: #008f6f;
    --vionn-teal-soft: rgba(0, 168, 132, 0.08);
    --vionn-dark: #0f172a; /* Deep Navy for Headings */
    --vionn-slate: #475569; /* Slate for Body Text */
    --vionn-muted: #94a3b8; /* Muted Text */
    --vionn-bg: #f8fafc;   /* Soft Background */
    --vionn-border: #e2e8f0;
    
    /* Layout Constants */
    --radius-full: 50px;
    --radius-lg: 24px;
    --radius-md: 16px;
    --shadow-soft: 0 10px 25px -5px rgba(0, 0, 0, 0.04), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-elevated: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 1. RESET & BASE STYLES */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--vionn-bg);
    color: var(--vionn-slate);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1240px; margin: 0 auto; padding: 0 24px; }

/* 2. PROFESSIONAL NAVBAR */
.navbar {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    height: 85px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-flex { display: flex; justify-content: space-between; align-items: center; width: 100%; }

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--vionn-dark);
    letter-spacing: -1px;
}

.logo span { color: var(--vionn-teal); }

.btn-cta {
    background: var(--vionn-teal);
    color: white;
    padding: 12px 30px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    transition: var(--transition);
    box-shadow: 0 4px 14px 0 rgba(0, 168, 132, 0.25);
}

.btn-cta:hover {
    transform: translateY(-2px);
    background: var(--vionn-teal-dark);
    box-shadow: 0 6px 20px rgba(0, 168, 132, 0.35);
}

/* 3. MODERN HERO SECTION */
.hero-section {
    padding: 100px 0 60px;
    text-align: center;
    background-image: radial-gradient(at 0% 0%, var(--vionn-teal-soft) 0, transparent 50%), 
                      radial-gradient(at 100% 100%, #f1f5f9 0, transparent 50%);
}

.sub-badge {
    background: var(--vionn-teal-soft);
    color: var(--vionn-teal);
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    display: inline-block;
    margin-bottom: 24px;
}

.hero-section h1 {
    font-size: clamp(2.5rem, 6vw, 3.8rem);
    font-weight: 800;
    color: var(--vionn-dark);
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -2px;
}

.hero-section p {
    font-size: 1.2rem;
    color: var(--vionn-slate);
    max-width: 680px;
    margin: 0 auto 50px;
}

/* 4. PREMIUM SEARCH COMPONENT */
.search-wrapper {
    max-width: 720px;
    margin: 0 auto;
    background: white;
    padding: 8px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-elevated);
    border: 1px solid rgba(0,0,0,0.02);
}

.search-input-box {
    display: flex;
    align-items: center;
    padding: 0 20px;
}

.search-input-box i { color: var(--vionn-teal); font-size: 1.2rem; }

.search-input-box input {
    border: none;
    outline: none;
    width: 100%;
    padding: 18px 15px;
    font-size: 1.1rem;
    font-family: inherit;
    font-weight: 500;
    color: var(--vionn-dark);
}

/* 5. DYNAMIC CHIPS BAR */
.filter-bar {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 40px 0 10px;
    overflow-x: auto;
}

.filter-bar::-webkit-scrollbar { display: none; }

.chip {
    white-space: nowrap;
    background: white;
    border: 1px solid var(--vionn-border);
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: var(--vionn-slate);
}

.chip.active {
    background: var(--vionn-teal);
    color: white;
    border-color: var(--vionn-teal);
    box-shadow: 0 10px 15px -3px rgba(0, 168, 132, 0.2);
}

/* 6. CONTENT GRID & PROFESSIONAL CARDS */
.app-content-area { padding-bottom: 100px; }

.vionn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.vionn-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 35px;
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.vionn-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-elevated);
    border-color: var(--vionn-teal-soft);
}

.vionn-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; width: 100%; height: 4px;
    background: var(--vionn-teal);
    transform: scaleX(0);
    transition: var(--transition);
}

.vionn-card:hover::after { transform: scaleX(1); }

.vionn-card h3 {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--vionn-dark);
    margin: 15px 0 12px;
    line-height: 1.3;
}

.vionn-card p {
    color: var(--vionn-slate);
    font-size: 0.95rem;
    margin-bottom: 25px;
}

.card-btn {
    margin-top: auto;
    color: var(--vionn-teal);
    font-weight: 800;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 7. LOADING SKELETON */
.skeleton-card {
    height: 280px;
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: skeleton-pulse 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-pulse {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 8. ANIMATIONS */
.animate-in {
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 9. RESPONSIVE QUERIES */
@media (max-width: 768px) {
    .navbar { height: 75px; }
    .hero-section { padding: 60px 0; }
    .hero-section h1 { font-size: 2.2rem; }
    .vionn-grid { grid-template-columns: 1fr; }
    .nav-actions { display: none; } /* Mobile पर CTA हटाएँ */
}