:root {
    --bg-main: #0b0f19;
    --primary: #00d2ff;
    --secondary: #3a7bd5;
    --text-light: #e0e6ed;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(0, 210, 255, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-light);
    background-image: radial-gradient(circle at top right, #112240, #0b0f19);
    min-height: 100vh;
    overflow-x: hidden;
}

h1, h2, h3, .logo {
    font-family: 'Orbitron', sans-serif;
}

#navbar {
    display: flex;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo { color: var(--primary); font-weight: bold; font-size: 1.2rem; }

.page { display: none; padding: 2rem; animation: fadeIn 0.5s ease; }
.page.active { display: flex; flex-direction: column; align-items: center; }

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

.hidden { display: none !important; }

/* Glassmorphism Cards */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 800px;
}

.card { max-width: 400px; text-align: center; }

.form-group { margin-bottom: 1.5rem; text-align: left; }
.form-group label { display: block; margin-bottom: 0.5rem; font-size: 0.9rem; color: var(--primary); }
input[type="text"], input[type="password"], textarea {
    width: 100%;
    padding: 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--glass-border);
    background: rgba(0,0,0,0.3);
    color: white;
    font-family: 'Inter', sans-serif;
}
input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 10px rgba(0, 210, 255, 0.5); }

/* Buttons */
button {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}
.btn-primary { background: linear-gradient(45deg, var(--secondary), var(--primary)); color: white; width: 100%; }
.btn-primary:hover { box-shadow: 0 0 15px var(--primary); transform: translateY(-2px); }
.btn-secondary { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-secondary:hover { background: rgba(0, 210, 255, 0.1); }

/* Dashboard Guru */
.teacher-mode { border-color: #ff3366; }
table { width: 100%; border-collapse: collapse; margin-top: 1.5rem; }
th, td { padding: 1rem; text-align: left; border-bottom: 1px solid rgba(255,255,255,0.1); }
th { color: var(--primary); }

.pwd-container { display: flex; gap: 10px; }
#toggle-pwd { padding: 0.8rem; background: var(--glass-bg); color: var(--primary); border: 1px solid var(--glass-border); }

/* Responsive */
@media (max-width: 600px) {
    .page { padding: 1rem; }
    .glass { padding: 1.5rem; }
}