* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 440px;
    padding: 48px 40px;
    position: relative;
    overflow: hidden;
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #2563eb, #93c5fd, #60a5fa);
    background-size: 300% 100%;
    animation: gradient 3s ease infinite;
}

@keyframes gradient {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.form-header {
    text-align: center;
    margin-bottom: 36px;
}

.form-title {
    font-size: 28px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 8px;
}

.form-subtitle {
    color: #6b7280;
    font-size: 16px;
}

.form-toggle {
    display: flex;
    background: #f8fafc;
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 32px;
    position: relative;
}

.toggle-btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: #6b7280;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    z-index: 2;
}

.toggle-btn.active {
    color: #3b82f6;
}

.toggle-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toggle-slider.signup {
    transform: translateX(100%);
}

.form-group {
    margin-bottom: 20px;
    position: relative;
}

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

.form-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #fff;
}

.form-input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-input.error {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-input.success {
    border-color: #10b981;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Password toggle */
.password-wrapper {
    position: relative;
}

.password-wrapper .form-input {
    padding-right: 48px;
}

.password-toggle {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #9ca3af;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.password-toggle:hover {
    color: #3b82f6;
}

.error-message {
    color: #ef4444;
    font-size: 14px;
    margin-top: 6px;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.error-message.show {
    opacity: 1;
    transform: translateY(0);
}

.phone-input-wrapper {
    display: flex;
    gap: 8px;
}

.country-code {
    width: 80px;
    flex-shrink: 0;
}

.forgot-password {
    text-align: right;
    margin-bottom: 24px;
}

.forgot-password a {
    color: #3b82f6;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.forgot-password a:hover {
    text-decoration: underline;
}

.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.4);
}

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

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.divider {
    margin: 24px 0;
    position: relative;
    text-align: center;
    color: #6b7280;
    font-size: 14px;
}

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

.divider span {
    background: rgba(255, 255, 255, 0.95);
    padding: 0 16px;
}

.google-btn {
    width: 100%;
    padding: 14px;
    border: 2px solid #e5e7eb;
    background: white;
    color: #374151;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.google-btn:hover {
    background: #f9fafb;
    border-color: #d1d5db;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.google-icon {
    width: 20px;
    height: 20px;
}

.signup-form {
    display: none;
}

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

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

.login-form {
    display: none;
}

.success-message {
    background: #ecfdf5;
    border: 1px solid #d1fae5;
    color: #065f46;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    display: none;
}

.success-message.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.success-message.error {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}

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

/* Tablet Responsive */
@media (max-width: 768px) {
    body {
        padding: 15px;
        padding-top: 100px;
    }
    
    .container {
        padding: 36px 28px;
        margin-top: 20px;
    }
    
    .form-title {
        font-size: 24px;
    }
    
    .form-subtitle {
        font-size: 14px;
    }
    
    .form-input {
        padding: 12px 14px;
        font-size: 16px; /* Prevent zoom on iOS */
    }
    
    .submit-btn {
        padding: 14px;
    }
}

/* Mobile Responsive */
@media (max-width: 480px) {
    body {
        padding: 10px;
        padding-top: 140px;
    }
    
    .container {
        padding: 24px 18px;
        margin: 10px 5px;
        border-radius: 18px;
    }
    
    .form-header {
        margin-bottom: 24px;
    }
    
    .form-title {
        font-size: 22px;
    }
    
    .form-subtitle {
        font-size: 13px;
    }
    
    .form-group {
        margin-bottom: 16px;
    }
    
    .form-label {
        font-size: 13px;
    }
    
    .form-input {
        padding: 12px;
        border-radius: 10px;
    }
    
    .toggle-btn {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .submit-btn {
        padding: 14px;
        font-size: 15px;
        border-radius: 10px;
    }
    
    .form-text {
        font-size: 12px;
    }
}