:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #10B981;
    --bg-color: #0F172A;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background: var(--bg-color);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(79, 70, 229, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.15), transparent 25%);
    color: var(--text-main);
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

/* Authentication Container */
.auth-wrapper {
    display: flex;
    flex: 1;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    height: 100%;
    width: 100%;
}

/* Background animated blobs */
.blob {
    position: absolute;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.6;
}
.blob-1 {
    top: -10%; left: -10%;
    width: 500px; height: 500px;
    background: #4F46E5;
    animation: float 10s ease-in-out infinite;
}
.blob-2 {
    bottom: -10%; right: -10%;
    width: 400px; height: 400px;
    background: #10B981;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -50px) rotate(10deg); }
    66% { transform: translate(-20px, 20px) rotate(-10deg); }
    100% { transform: translate(0, 0) rotate(0deg); }
}

/* Glassmorphism Card */
.auth-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    padding: 2.5rem;
    position: relative;
    z-index: 10;
}

.brand-header {
    text-align: center;
    margin-bottom: 2rem;
}
.brand-logo {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, #fff, #a5b4fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}
.brand-tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Toggle Switch */
.role-toggle {
    display: flex;
    background: rgba(0,0,0,0.2);
    border-radius: 12px;
    padding: 0.3rem;
    margin-bottom: 2rem;
    position: relative;
}
.role-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.8rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
    z-index: 1;
}
.role-btn.active {
    color: #fff;
}
.role-slider {
    position: absolute;
    top: 0.3rem;
    left: 0.3rem;
    width: calc(50% - 0.3rem);
    height: calc(100% - 0.6rem);
    background: var(--primary-color);
    border-radius: 8px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
}
.role-toggle[data-active="teacher"] .role-slider {
    transform: translateX(100%);
}

/* Forms */
.auth-form {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}
.auth-form.active {
    display: block;
}

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

.form-group {
    margin-bottom: 1.5rem;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}
.form-control {
    width: 100%;
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 0.9rem 1rem;
    border-radius: 10px;
    font-size: 1rem;
    transition: var(--transition);
}
.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
    background: rgba(0,0,0,0.3);
}

.btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.btn-primary {
    background: var(--primary-color);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
}

/* Responsive Scaling */
@media screen and (max-width: 600px) {
    .auth-wrapper {
        padding: 1rem;
    }
    .auth-card {
        padding: 1.5rem;
        border-radius: 16px;
    }
    .brand-logo {
        font-size: 1.3rem !important;
    }
    .btn {
        padding: 0.8rem;
    }
    .form-control {
        padding: 0.8rem 1rem;
    }
}

/* Alert Messages */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    display: none;
}
.alert.success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #34d399;
    display: block;
}
.alert.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #f87171;
    display: block;
}

/* Dashboard Specifics */
.dashboard-nav {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.dashboard-content {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(0,0,0,0.2);
    border-radius: 12px;
    overflow: hidden;
}
.data-table th, .data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.data-table th {
    background: rgba(255,255,255,0.05);
    color: var(--text-muted);
    font-weight: 500;
}

/* Blinking Animation */
.blinking-text {
    animation: blinker 1.5s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes blinker {
    50% { opacity: 0.3; }
}