/* Physics Learning Theme */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700&family=Poppins:wght@400;500;600&display=swap');

:root {
    --primary: #6C5CE7;
    --secondary: #00CEC9;
    --accent: #FDCB6E;
    --blue: #0984E3;
    --red: #D63031;
    --green: #00B894;
    --orange: #E17055;
    --bg: #DFE6E9;
    --dark: #2D3436;
    --light: #FFFFFF;
}

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

body { font-family: 'Poppins', sans-serif; background: var(--bg); color: var(--dark); line-height: 1.7; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

header { background: linear-gradient(135deg, var(--primary), var(--blue)); padding: 15px 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 4px 15px rgba(108,92,231,0.3); }
header .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.logo { font-size: 28px; color: white; text-decoration: none; font-weight: bold; font-family: 'Orbitron', sans-serif; text-shadow: 2px 2px 4px rgba(0,0,0,0.2); }
nav { display: flex; gap: 15px; flex-wrap: wrap; }
nav a { color: white; text-decoration: none; padding: 8px 16px; border-radius: 25px; background: rgba(255,255,255,0.2); font-weight: 500; transition: all 0.3s; }
nav a:hover, nav a.active { background: white; color: var(--primary); transform: translateY(-2px); }

.hero { background: linear-gradient(135deg, var(--dark), var(--primary)); padding: 60px 20px; text-align: center; color: white; }
.hero h1 { font-size: 48px; margin-bottom: 15px; font-family: 'Orbitron', sans-serif; }
.hero p { font-size: 20px; opacity: 0.95; }

.main { padding: 40px 20px; }
.breadcrumb { padding: 15px 0; font-size: 14px; color: #666; }
.breadcrumb a { color: var(--blue); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 25px; margin: 30px 0; }

.card { background: white; border-radius: 20px; overflow: hidden; box-shadow: 0 8px 25px rgba(0,0,0,0.08); transition: all 0.3s; border: 3px solid transparent; }
.card:hover { transform: translateY(-8px); box-shadow: 0 15px 35px rgba(0,0,0,0.15); border-color: var(--accent); }

.card-icon { height: 150px; display: flex; align-items: center; justify-content: center; font-size: 70px; background: linear-gradient(135deg, var(--primary), var(--secondary)); }
.card:nth-child(2n) .card-icon { background: linear-gradient(135deg, var(--blue), var(--green)); }
.card:nth-child(3n) .card-icon { background: linear-gradient(135deg, var(--red), var(--orange)); }
.card:nth-child(4n) .card-icon { background: linear-gradient(135deg, var(--accent), var(--primary)); }

.card-body { padding: 20px; }
.card-body h3 { font-size: 18px; margin-bottom: 10px; }
.card-body h3 a { color: var(--dark); text-decoration: none; }
.card-body h3 a:hover { color: var(--primary); }
.card-body p { font-size: 14px; color: #666; }

.list { display: flex; flex-direction: column; gap: 15px; }
.list-item { background: white; padding: 20px; border-radius: 15px; display: flex; align-items: center; gap: 20px; box-shadow: 0 3px 10px rgba(0,0,0,0.05); transition: all 0.3s; }
.list-item:hover { transform: scale(1.02); }
.list-icon { width: 60px; height: 60px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; }

.game-container { background: white; border-radius: 20px; padding: 30px; margin: 20px 0; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }
.game-area { background: white; border-radius: 20px; padding: 40px; margin: 30px auto; max-width: 700px; text-align: center; }

footer { background: var(--dark); color: white; padding: 30px 0; text-align: center; margin-top: 50px; }
footer a { color: var(--accent); text-decoration: none; margin: 0 10px; }
footer a:hover { text-decoration: underline; }

.btn { display: inline-block; padding: 12px 30px; background: linear-gradient(135deg, var(--primary), var(--blue)); color: white; text-decoration: none; border-radius: 30px; font-weight: bold; transition: all 0.3s; border: none; cursor: pointer; }
.btn:hover { transform: scale(1.05); box-shadow: 0 5px 20px rgba(108,92,231,0.4); }
.btn-secondary { background: linear-gradient(135deg, var(--secondary), var(--green)); }

.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

@media (max-width: 768px) { .hero h1 { font-size: 32px; } .grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); } }

.search-box { max-width: 600px; margin: 30px auto; display: flex; gap: 10px; }
.search-box input { flex: 1; padding: 15px 20px; border: 3px solid var(--secondary); border-radius: 30px; font-size: 16px; outline: none; }
.search-box input:focus { border-color: var(--primary); }

.about-section { background: white; border-radius: 20px; padding: 40px; margin: 20px 0; box-shadow: 0 5px 20px rgba(0,0,0,0.08); }
.about-section h2 { color: var(--primary); margin-bottom: 20px; font-size: 28px; }
.about-section p { margin-bottom: 15px; line-height: 2; color: #555; }

.legal-content { background: white; padding: 40px; border-radius: 20px; line-height: 2; }
.legal-content h2 { color: var(--primary); margin: 30px 0 15px; }

a { color: var(--blue); }
img { max-width: 100%; height: auto; }