/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #5e72e4;
    --primary-dark: #4c63d2;
    --primary-light: #7b8ff7;
    --secondary: #f4f5f7;
    --text-primary: #32325d;
    --text-secondary: #525f7f;
    --text-light: #8898aa;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --border: #e9ecef;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-logo i {
    font-size: 1.75rem;
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-back:hover {
    color: var(--primary);
    background: var(--gray-100);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 1100px;
    width: 100%;
    background: var(--white);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    min-height: 600px;
}

/* Login Container */
.login-container {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.icon-container {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--white);
    box-shadow: 0 8px 24px rgba(94, 114, 228, 0.25);
}

.login-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.login-header p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Form Styles */
.login-form {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 1rem;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--white);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(94, 114, 228, 0.1);
}

.form-input::placeholder {
    color: var(--text-light);
}

.toggle-password {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1rem;
    transition: var(--transition);
    border-radius: 6px;
}

.toggle-password:hover {
    color: var(--primary);
    background: var(--gray-100);
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 2rem;
}

.submit-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(94, 114, 228, 0.3);
}

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

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-icon {
    transition: transform 0.3s ease;
}

.submit-btn:hover .btn-icon {
    transform: translateX(4px);
}

/* Divider */
.divider {
    text-align: center;
    margin: 2rem 0;
    position: relative;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border);
}

.divider span {
    background: var(--white);
    padding: 0 1rem;
    color: var(--text-light);
    font-size: 0.875rem;
    position: relative;
}

/* Alternative Actions */
.alternative-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.alt-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.875rem;
    transition: var(--transition);
}

.alt-link:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(94, 114, 228, 0.05);
}

.alt-link strong {
    font-weight: 600;
    color: var(--primary);
}

/* Info Panel */
.info-panel {
    background: var(--gradient);
    padding: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.info-panel::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.info-content {
    position: relative;
    z-index: 1;
    color: var(--white);
    max-width: 400px;
}

.info-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.info-content > p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.features-list {
    list-style: none;
    margin-bottom: 2rem;
}

.features-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.features-list i {
    font-size: 1.25rem;
    margin-top: 0.1rem;
    opacity: 0.9;
}

.info-footer {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
    font-size: 0.875rem;
    opacity: 0.8;
}

.info-footer i {
    color: #ff6b6b;
    margin: 0 0.25rem;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 2rem;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--white);
    border-radius: 20px;
    padding: 3rem;
    max-width: 450px;
    width: 100%;
    text-align: center;
    transform: scale(0.9) translateY(20px);
    transition: var(--transition);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.modal-overlay.show .modal-container {
    transform: scale(1) translateY(0);
}

.modal-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--white);
    transition: var(--transition);
}

.modal-icon.admin {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.modal-icon.teacher {
    background: var(--gradient);
}

.modal-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.modal-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.modal-message {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.modal-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.modal-loading.completed .loading-spinner {
    border-color: #10b981;
    animation: none;
    position: relative;
}

.modal-loading.completed .loading-spinner::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #10b981;
    font-size: 0.875rem;
    font-weight: bold;
}

.loading-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.modal-loading.completed .loading-text {
    color: #10b981;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.modal-btn {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: 0.875rem 2rem;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.6;
}

.modal-btn.ready {
    opacity: 1;
}

.modal-btn.ready:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(94, 114, 228, 0.3);
}

/* Error Message */
.error-message {
    background: #fee;
    border: 1px solid #fcc;
    color: #c33;
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    text-align: center;
    font-size: 0.875rem;
    animation: fadeIn 0.3s ease-out;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .login-wrapper {
        grid-template-columns: 1fr;
        max-width: 500px;
    }

    .info-panel {
        display: none;
    }

    .login-container {
        padding: 2.5rem;
    }
}

@media (max-width: 640px) {
    .nav-container {
        padding: 1rem;
    }

    .nav-logo span {
        display: none;
    }

    .nav-back span {
        display: none;
    }

    .main-content {
        padding: 1rem;
    }

    .login-container {
        padding: 2rem 1.5rem;
    }

    .login-header h1 {
        font-size: 1.75rem;
    }

    .icon-container {
        width: 70px;
        height: 70px;
        font-size: 2rem;
    }

    .form-input {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .modal-container {
        padding: 2rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --gray-50: #1f2937;
        --gray-100: #374151;
        --white: #111827;
        --text-primary: #f3f4f6;
        --text-secondary: #d1d5db;
        --text-light: #9ca3af;
        --border: #374151;
    }

    .nav-back:hover {
        background: var(--gray-100);
    }

    .form-input {
        background: var(--gray-50);
    }

    .toggle-password:hover {
        background: var(--gray-100);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
.nav-back:focus,
.form-input:focus,
.toggle-password:focus,
.submit-btn:focus,
.alt-link:focus,
.modal-btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .info-panel,
    .modal-overlay {
        display: none;
    }
}