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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

/* Auth Wrapper */
.auth-wrapper {
    display: flex;
    position: relative;
    width: 100%;
    max-width: 900px;
    min-height: 600px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.auth-card {
    flex: 1;
    padding: 45px 35px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

/* Header */
.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
    font-size: 24px;
    font-weight: 700;
    color: #4f46e5;
}

.logo i {
    font-size: 32px;
}

.auth-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 8px;
}

.auth-header p {
    color: #6b7280;
    font-size: 16px;
}

/* Forms */
.auth-form {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.auth-form.active {
    display: block;
}

.input-group {
    margin-bottom: 18px;
    position: relative;
}

.input-group label {
    display: block;
    font-weight: 500;
    color: #374151;
    margin-bottom: 6px;
    font-size: 14px;
}

.input-group input {
    width: 100%;
    padding: 14px 18px 14px 48px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    font-size: 15px;
    background: #f9fafb;
    transition: all 0.3s ease;
    outline: none;
}

.input-group input:focus {
    border-color: #4f46e5;
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #9ca3af;
    font-size: 15px;
}

.input-group input:focus + .input-icon,
.input-icon {
    color: #4f46e5;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #6b7280;
}

.checkbox input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid #d1d5db;
    border-radius: 4px;
    margin-right: 8px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox input:checked + .checkmark {
    background: #4f46e5;
    border-color: #4f46e5;
}

.checkbox input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.forgot-link {
    color: #4f46e5;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.forgot-link:hover {
    color: #3730a3;
}

.auth-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.auth-btn.primary {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.auth-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
}

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

.auth-btn:disabled:hover {
    transform: none;
}

/* OAuth Section */
.oauth-section {
    margin-top: 40px;
}

.divider {
    text-align: center;
    position: relative;
    margin-bottom: 24px;
    color: #9ca3af;
    font-size: 14px;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: #e5e7eb;
    z-index: 1;
}

.divider span {
    background: #ffffff;
    padding: 0 16px;
    position: relative;
    z-index: 2;
}

.oauth-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.oauth-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s ease;
    background: #ffffff;
    gap: 8px;
}

.oauth-btn:hover {
    transform: translateY(-2px);
    border-color: #d1d5db;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.oauth-btn i {
    font-size: 20px;
}

.oauth-btn span {
    font-size: 12px;
    font-weight: 500;
    color: #374151;
}

.oauth-btn.google:hover i {
    color: #db4437;
}

.oauth-btn.facebook:hover i {
    color: #1877f2;
}

.oauth-btn.twitter:hover i {
    color: #1da1f2;
}

/* Footer */
.auth-footer {
    text-align: center;
    margin-top: 30px;
}

.auth-footer p {
    color: #6b7280;
    font-size: 14px;
}

.auth-footer a {
    color: #4f46e5;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.auth-footer a:hover {
    color: #3730a3;
}

/* Background Design */
.auth-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.background-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, rgba(79, 70, 229, 0.1), rgba(124, 58, 237, 0.1));
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 300px;
    height: 300px;
    top: -150px;
    right: -150px;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    bottom: -100px;
    left: -100px;
    animation-delay: 2s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    top: 50%;
    left: -75px;
    animation-delay: 4s;
}

.shape-4 {
    width: 250px;
    height: 250px;
    top: 20%;
    right: -125px;
    animation-delay: 1s;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

/* Loading */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e5e7eb;
    border-top: 4px solid #4f46e5;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

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

/* Messages */
.message {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    animation: slideDown 0.3s ease-out;
}

.message div {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.message.success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.message.error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.message i {
    font-size: 16px;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.link {
    color: #4f46e5;
    text-decoration: none;
}

.link:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .auth-wrapper {
        max-width: 100%;
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
    }

    .auth-card {
        padding: 40px 20px;
    }

    .oauth-buttons {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .auth-header h2 {
        font-size: 28px;
    }

    .input-group input {
        padding: 14px 16px 14px 44px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .auth-card {
        padding: 30px 16px;
    }

    .form-options {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

    .auth-header h2 {
        font-size: 24px;
    }
}

/* Animations and Transitions */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    75% {
        transform: translateX(5px);
    }
}

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

/* Button Animations */
.btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Loading Animation */
.btn.loading {
    pointer-events: none;
}

.btn.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Form Animations */
.form-group {
    animation: fadeIn 0.6s ease-out;
}

.form-group:nth-child(1) { animation-delay: 0.1s; }
.form-group:nth-child(2) { animation-delay: 0.2s; }
.form-group:nth-child(3) { animation-delay: 0.3s; }
.form-group:nth-child(4) { animation-delay: 0.4s; }

/* Input Focus Animations */
.input-group input:focus {
    transform: scale(1.02);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-group input.error {
    animation: shake 0.5s ease-in-out;
    border-color: #ef4444;
}

/* Message Animations */
.message {
    animation: slideIn 0.5s ease-out;
}

.message.success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.message.error {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

/* Rate Limit Warning */
.rate-limit-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    animation: pulse 2s infinite;
}

/* Success Checkmark Animation */
.success-checkmark {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #10b981;
    position: relative;
    margin-right: 8px;
    animation: pulse 1s ease-in-out;
}

.success-checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
    font-size: 12px;
}

/* Error Icon Animation */
.error-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #ef4444;
    position: relative;
    margin-right: 8px;
    animation: shake 0.5s ease-in-out;
}

.error-icon::after {
    content: '✕';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
    font-size: 12px;
}

/* Smooth Transitions */
* {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Disable transitions during loading */
.loading * {
    transition: none !important;
}