/* Elegant Portfolio Login Form - Complete & Self-Contained */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    line-height: 1.6;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.05)"/><circle cx="50" cy="10" r="1" fill="rgba(255,255,255,0.08)"/><circle cx="10" cy="60" r="1" fill="rgba(255,255,255,0.06)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
    z-index: 0;
}

.login-container {
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 48px 40px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.card-accent {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #FF6B6B, #4ECDC4, #45B7D1, #96CEB4);
    background-size: 200% 100%;
    animation: gradientSlide 3s ease infinite;
}

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

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    margin-bottom: 24px;
    display: flex;
    justify-content: center;
    animation: logoFloat 4s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.login-header h1 {
    color: #2d3748;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.login-header p {
    color: #718096;
    font-size: 15px;
    font-weight: 400;
}

/* Form Fields */
.form-field {
    position: relative;
    margin-bottom: 32px;
}

.form-field input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 2px solid #e2e8f0;
    padding: 12px 0;
    color: #2d3748;
    font-size: 16px;
    font-weight: 400;
    outline: none;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-field input:focus {
    border-bottom-color: transparent;
}

.form-field label {
    position: absolute;
    left: 0;
    top: 12px;
    color: #a0aec0;
    font-size: 16px;
    font-weight: 400;
    pointer-events: none;
    transition: all 0.3s ease;
    transform-origin: left;
}

.form-field input:focus + label,
.form-field input:not(:placeholder-shown) + label {
    top: -8px;
    font-size: 12px;
    font-weight: 600;
    color: #4a5568;
    transform: translateY(0);
}

.field-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
    transition: width 0.3s ease;
}

.form-field input:focus ~ .field-line {
    width: 100%;
}

/* Password Field */
.form-field:has(.password-reveal) input {
    padding-right: 48px;
}

.password-reveal {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #a0aec0;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-reveal:hover {
    color: #4a5568;
    background: rgba(0, 0, 0, 0.05);
}

.eye-hide {
    display: none;
}

.password-reveal.reveal-active .eye-show {
    display: none;
}

.password-reveal.reveal-active .eye-hide {
    display: block;
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 36px;
    flex-wrap: wrap;
    gap: 16px;
}

.remember-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #4a5568;
    font-weight: 500;
}

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

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e0;
    border-radius: 4px;
    margin-right: 10px;
    position: relative;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: transparent;
}

.remember-checkbox input[type="checkbox"]:checked + .checkbox-custom {
    background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
    border-color: transparent;
    color: white;
}

.forgot-password {
    color: #4a5568;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
}

.forgot-password::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
    transition: width 0.3s ease;
}

.forgot-password:hover::after {
    width: 100%;
}

.forgot-password:hover {
    color: #2d3748;
}

/* Sign In Button */
.signin-button {
    width: 100%;
    background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
    color: #ffffff;
    border: none;
    border-radius: 12px;
    padding: 16px 24px;
    cursor: pointer;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    position: relative;
    margin-bottom: 32px;
    transition: all 0.3s ease;
    overflow: hidden;
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.signin-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.signin-button:hover::before {
    left: 100%;
}

.signin-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
}

.signin-button:active {
    transform: translateY(0);
}

.signin-button:disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.button-text {
    transition: opacity 0.2s ease;
}

.button-loader {
    position: absolute;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.loader-circle {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.signin-button.loading .button-text {
    opacity: 0;
}

.signin-button.loading .button-loader {
    opacity: 1;
}

/* Auth Divider */
.auth-divider {
    text-align: center;
    margin: 32px 0;
    position: relative;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #e2e8f0, transparent);
}

.auth-divider span {
    background: rgba(255, 255, 255, 0.95);
    color: #718096;
    padding: 0 20px;
    font-size: 13px;
    font-weight: 500;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Social Auth */
.social-auth {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
}

.social-button {
    flex: 1;
    background: #ffffff;
    color: #4a5568;
    border: 1.5px solid #e2e8f0;
    border-radius: 10px;
    padding: 12px 16px;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
    min-height: 46px;
    position: relative;
    overflow: hidden;
}

.social-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.02), transparent);
    transition: left 0.3s ease;
}

.social-button:hover::before {
    left: 100%;
}

.social-button:hover {
    border-color: #cbd5e0;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.social-button:active {
    transform: translateY(0);
}

/* Signup Prompt */
.signup-prompt {
    text-align: center;
    font-size: 14px;
    color: #718096;
}

.signup-link {
    color: #4a5568;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    position: relative;
}

.signup-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
    transition: width 0.3s ease;
}

.signup-link:hover::after {
    width: 100%;
}

.signup-link:hover {
    color: #2d3748;
}

/* Error States */
.error-message {
    color: #e53e3e;
    font-size: 12px;
    font-weight: 500;
    margin-top: 8px;
    opacity: 0;
    transform: translateY(-4px);
    transition: all 0.2s ease;
}

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

.form-field.error input {
    border-bottom-color: #e53e3e;
}

.form-field.error .field-line {
    background: #e53e3e;
    width: 100%;
}

.form-field.error label {
    color: #e53e3e;
}

/* Success State */
.success-state {
    display: none;
    text-align: center;
    padding: 40px 20px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
}

.success-state.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.success-visual {
    margin: 0 auto 20px;
    animation: successFloat 0.6s ease-out;
}

@keyframes successFloat {
    0% { transform: scale(0) rotate(0deg); }
    50% { transform: scale(1.1) rotate(180deg); }
    100% { transform: scale(1) rotate(360deg); }
}

.success-state h3 {
    color: #2d3748;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.success-state p {
    color: #718096;
    font-size: 14px;
}

/* Mobile Responsive */
@media (max-width: 480px) {
    body {
        padding: 16px;
    }
    
    .login-card {
        padding: 36px 28px;
        border-radius: 16px;
    }
    
    .login-header h1 {
        font-size: 1.75rem;
    }
    
    .form-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .social-auth {
        flex-direction: column;
    }
}
/* === Accessibility: keyboard focus indicators === */
/* Restores visible focus rings for keyboard users without affecting mouse interaction. */
:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Reduced motion: respect user preference. Animations defined per form will tone down. */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}
