/* ============================================
   LOGIN SCREEN STYLES
   ============================================ */

#login-screen {
    min-height: 100vh;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 40%, #312E81 100%);
}

/* === Animated Background === */
.login-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.08;
    animation: floatShape 20s ease-in-out infinite;
}

.shape-1 {
    width: 500px; height: 500px;
    background: var(--gradient-primary);
    top: -10%; left: -5%;
    animation-delay: 0s;
    animation-duration: 25s;
}

.shape-2 {
    width: 350px; height: 350px;
    background: var(--gradient-accent);
    top: 50%; right: -8%;
    animation-delay: -5s;
    animation-duration: 20s;
}

.shape-3 {
    width: 250px; height: 250px;
    background: var(--gradient-warm);
    bottom: -5%; left: 30%;
    animation-delay: -10s;
    animation-duration: 22s;
}

.shape-4 {
    width: 180px; height: 180px;
    background: var(--gradient-danger);
    top: 20%; right: 25%;
    animation-delay: -3s;
    animation-duration: 18s;
}

/* === Login Container === */
.login-container {
    position: relative;
    z-index: 1;
    display: flex;
    min-height: 100vh;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-8);
    gap: var(--space-16);
    align-items: center;
}

/* === Left Panel === */
.login-left {
    flex: 1;
    color: #fff;
    padding-right: var(--space-8);
}

.login-brand {
    margin-bottom: var(--space-12);
}

.brand-icon {
    width: 72px;
    height: 72px;
    color: var(--primary-400);
    margin-bottom: var(--space-6);
    animation: pulse-glow 3s ease-in-out infinite;
}

.login-brand h1 {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--primary-300) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    margin-bottom: var(--space-3);
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--gray-400);
    font-weight: 400;
    letter-spacing: 0.5px;
}

.login-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.feature-item {
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
    padding: var(--space-5);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(8px);
    transition: all var(--duration-normal) var(--ease-smooth);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(8px);
}

.feature-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.feature-item h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: #fff;
}

.feature-item p {
    font-size: var(--font-size-sm);
    color: var(--gray-400);
    line-height: 1.5;
}

/* === Right Panel — Login Card === */
.login-right {
    width: 440px;
    flex-shrink: 0;
}

.login-card {
    padding: var(--space-10);
    border-radius: var(--radius-xl);
    animation: slideUp 0.6s var(--ease-smooth);
}

.glass-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-2xl), 0 0 40px rgba(99, 102, 241, 0.1);
}

.login-card h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
}

.login-subtitle {
    color: var(--gray-500);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-8);
}

/* === Form Elements === */
.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--space-3);
    width: 18px;
    height: 18px;
    color: var(--gray-400);
    pointer-events: none;
    z-index: 1;
}

.input-wrapper input {
    padding-left: 42px;
    height: 48px;
    font-size: var(--font-size-base);
    border-radius: var(--radius-md);
}

.toggle-password {
    position: absolute;
    right: var(--space-3);
    padding: var(--space-1);
    color: var(--gray-400);
    transition: color var(--duration-fast);
    z-index: 1;
}

.toggle-password:hover { color: var(--gray-600); }
.toggle-password svg { width: 18px; height: 18px; }

/* === Form Options === */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    user-select: none;
}

.checkbox-wrapper input { display: none; }

.checkmark {
    width: 18px; height: 18px;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    position: relative;
    transition: all var(--duration-fast);
    flex-shrink: 0;
}

.checkbox-wrapper input:checked + .checkmark {
    background: var(--primary-500);
    border-color: var(--primary-500);
}

.checkbox-wrapper input:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 5px; top: 2px;
    width: 4px; height: 8px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* === Login Button === */
.btn-login {
    width: 100%;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: #fff;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    border: none;
    transition: all var(--duration-normal) var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.btn-login::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--duration-normal);
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-login:hover::before { opacity: 1; }

.btn-login:active {
    transform: translateY(0);
}

.btn-login svg {
    width: 18px; height: 18px;
    transition: transform var(--duration-normal);
}

.btn-login:hover svg { transform: translateX(4px); }

.btn-login.loading span { opacity: 0; }
.btn-login.loading::after {
    content: '';
    width: 22px; height: 22px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    position: absolute;
    animation: spin 0.6s linear infinite;
}

/* === Error Message === */
.error-message {
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--danger-50);
    color: var(--danger-600);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    border-left: 3px solid var(--danger-500);
    animation: shake 0.4s ease;
}

/* === Demo Accounts === */
.demo-accounts {
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

.demo-title {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-3);
}

.demo-chips {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.demo-chip {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    border: 1.5px solid var(--gray-200);
    transition: all var(--duration-fast) var(--ease-smooth);
    text-align: left;
}

.demo-chip:hover {
    border-color: var(--primary-300);
    background: var(--primary-50);
    transform: translateX(4px);
}

.demo-chip.admin:hover { border-color: var(--danger-300); background: var(--danger-50); }
.demo-chip.teacher:hover { border-color: var(--accent-300); background: var(--accent-50); }
.demo-chip.student:hover { border-color: var(--info-300); background: var(--info-50); }

.chip-role {
    font-size: var(--font-size-xs);
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    min-width: 70px;
    text-align: center;
}

.admin .chip-role { background: var(--danger-100); color: var(--danger-600); }
.teacher .chip-role { background: var(--accent-100); color: var(--accent-700); }
.student .chip-role { background: var(--info-100); color: var(--info-500); }

.chip-email {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    font-family: monospace;
}

/* === Responsive === */
@media (max-width: 900px) {
    .login-container {
        flex-direction: column;
        justify-content: center;
        gap: var(--space-8);
        padding: var(--space-6);
    }
    .login-left {
        text-align: center;
        padding-right: 0;
    }
    .login-features { display: none; }
    .login-right { width: 100%; max-width: 440px; }
    .login-brand { margin-bottom: var(--space-6); }
    .brand-icon { margin: 0 auto var(--space-4); }
    .login-brand h1 { font-size: var(--font-size-2xl); }
}