/* Modern Login Page Design */

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent-color: #0ea5e9;
    --success-color: #10b981;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    line-height: 1.6;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
    z-index: -1;
}

/* Login Container */
.login-container {
    width: 100%;
    max-width: 460px;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Login Card */
.login-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 3rem 2.5rem;
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

/* Logo and Header */
.login-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.login-logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    box-shadow: var(--shadow-md);
}

.login-logo svg {
    width: 36px;
    height: 36px;
    color: white;
}

.login-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.login-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Form Styles */
.login-form {
    margin-bottom: 2rem;
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 0.95rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.2s ease;
    outline: none;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* Remember Me Checkbox */
.remember-me-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.remember-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
    margin: 0;
}

.checkbox-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    margin: 0;
}

.forgot-password {
    font-size: 0.875rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.forgot-password:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Submit Button */
.btn-submit {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(37, 99, 235, 0.3);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(37, 99, 235, 0.4);
}

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

/* Divider */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 2rem 0 1.5rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

/* OAuth Buttons */
.oauth-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    margin-bottom: 2rem;
}

.btn-oauth {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 0.95rem;
    font-weight: 500;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    position: relative;
}

.btn-oauth:hover {
    border-color: var(--text-secondary);
    background: var(--bg-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-oauth svg,
.btn-oauth img {
    width: 20px;
    height: 20px;
}

/* Individual OAuth button styles */
.btn-google {
    border-color: #ea4335;
}

.btn-google:hover {
    background: #ea4335;
    color: white;
    border-color: #ea4335;
}

.btn-microsoft {
    border-color: #00a4ef;
}

.btn-microsoft:hover {
    background: #00a4ef;
    color: white;
    border-color: #00a4ef;
}

.btn-github {
    border-color: #24292e;
}

.btn-github:hover {
    background: #24292e;
    color: white;
    border-color: #24292e;
}

/* Footer */
.login-footer {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.login-footer a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s ease;
}

.login-footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Error Messages */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}

.alert-danger {
    background: #fee2e2;
    border-left: 4px solid #ef4444;
    color: #991b1b;
}

.alert-success {
    background: #d1fae5;
    border-left: 4px solid #10b981;
    color: #065f46;
}

/* Help Text */
.help-block {
    font-size: 0.8rem;
    color: #ef4444;
    margin-top: 0.375rem;
}

/* Responsive */
@media (max-width: 640px) {
    .login-card {
        padding: 2rem 1.5rem;
    }

    .login-title {
        font-size: 1.5rem;
    }

    body {
        padding: 1rem;
    }
}

/* Loading State */
.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-submit.loading {
    position: relative;
    color: transparent;
}

.btn-submit.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* Field Icons */
.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

.input-group .form-control {
    padding-left: 3rem;
}