/* 
 * Silkflex Login Page - Standalone CSS
 * เฉพาะสำหรับหน้า login.html ไม่มี dependency กับ styles.css
 * Version: 2.0 - Complete Isolation
 */

/* ========================
   LOGIN PAGE WRAPPER
   ======================== */
.silkflex-login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    margin-top: 80px;
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
}

/* ========================
   LOGIN CONTAINER
   ======================== */
.silkflex-login-page .login-container {
    width: 100%;
    max-width: 450px;
    position: relative;
    z-index: 100;
}

.silkflex-login-page .login-box {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(10px);
}

/* ========================
   LOGIN HEADER
   ======================== */
.silkflex-login-page .login-header {
    background: linear-gradient(135deg, #ff8c42, #ffa726);
    color: white;
    padding: 2.5rem 2rem 2rem;
    text-align: center;
    position: relative;
}

.silkflex-login-page .login-header::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(135deg, #ff8c42, #ffa726);
    border-radius: 0 0 50% 50%;
    transform: scaleX(1.2);
}

.silkflex-login-page .login-logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.silkflex-login-page .login-logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: transform 0.3s ease;
}

.silkflex-login-page .login-logo-img:hover {
    transform: scale(1.05);
}

.silkflex-login-page .login-logo p {
    opacity: 0.95;
    font-size: 0.95rem;
    margin: 0;
    font-weight: 400;
    position: relative;
    z-index: 2;
}

/* ========================
   TAB NAVIGATION
   ======================== */
.silkflex-login-page .tab-navigation {
    display: flex;
    background: white;
    border-bottom: 1px solid #f0f0f0;
    position: relative;
    z-index: 200;
}

.silkflex-login-page .tab-btn {
    flex: 1;
    padding: 1.25rem 1rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
    color: #666;
    transition: all 0.3s ease;
    position: relative;
    outline: none;
    user-select: none;
    text-transform: none;
    letter-spacing: normal;
}

.silkflex-login-page .tab-btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: #ff8c42;
    transition: width 0.3s ease;
}

.silkflex-login-page .tab-btn:hover {
    background: rgba(255, 140, 66, 0.05);
    color: #333;
}

.silkflex-login-page .tab-btn.active {
    color: #ff8c42;
    background: rgba(255, 140, 66, 0.08);
    font-weight: 600;
}

.silkflex-login-page .tab-btn.active::before {
    width: 60%;
}

/* ========================
   TAB CONTENT
   ======================== */
.silkflex-login-page .tab-content {
    display: none;
    padding: 2.5rem 2rem;
    background: white;
    animation: fadeIn 0.4s ease-out;
}

.silkflex-login-page .tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(15px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* ========================
   FORM STYLES
   ======================== */
.silkflex-login-page .auth-form {
    margin: 0 0 1.5rem 0;
}

.silkflex-login-page .form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.silkflex-login-page .form-group label {
    display: block;
    margin-bottom: 0.6rem;
    font-weight: 500;
    color: #444;
    font-size: 0.95rem;
}

.silkflex-login-page .form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #e8e8e8;
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: #fafafa;
    box-sizing: border-box;
    outline: none;
}

.silkflex-login-page .form-group input::placeholder {
    color: #999;
    opacity: 1;
}

.silkflex-login-page .form-group input:focus {
    border-color: #ff8c42;
    background: white;
    box-shadow: 0 0 0 4px rgba(255, 140, 66, 0.1);
    transform: translateY(-1px);
}

.silkflex-login-page .form-group input:valid {
    border-color: #27ae60;
}

/* ========================
   PASSWORD INPUT
   ======================== */
.silkflex-login-page .password-input {
    position: relative;
}

.silkflex-login-page .password-input input {
    padding-right: 3rem;
}

.silkflex-login-page .password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    cursor: pointer;
    color: #888;
    transition: color 0.3s ease;
    padding: 0.25rem;
    border-radius: 6px;
    outline: none;
}

.silkflex-login-page .password-toggle:hover {
    color: #ff8c42;
    background: rgba(255, 140, 66, 0.1);
}

.silkflex-login-page .password-toggle:focus {
    outline: 2px solid #ff8c42;
    outline-offset: 2px;
}

/* ========================
   FORM OPTIONS
   ======================== */
.silkflex-login-page .form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.silkflex-login-page .checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.9rem;
    color: #666;
    user-select: none;
}

.silkflex-login-page .checkbox-label input[type="checkbox"] {
    display: none;
}

.silkflex-login-page .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #ddd;
    border-radius: 6px;
    margin-right: 0.6rem;
    position: relative;
    transition: all 0.3s ease;
    flex-shrink: 0;
    background: white;
}

.silkflex-login-page .checkbox-label:hover .checkmark {
    border-color: #ff8c42;
    background: rgba(255, 140, 66, 0.05);
}

.silkflex-login-page .checkbox-label input:checked + .checkmark {
    background: #ff8c42;
    border-color: #ff8c42;
    transform: scale(1.1);
}

.silkflex-login-page .checkbox-label input:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.silkflex-login-page .forgot-password,
.silkflex-login-page .link {
    color: #ff8c42;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.25rem 0;
    border-radius: 4px;
}

.silkflex-login-page .forgot-password:hover,
.silkflex-login-page .link:hover {
    color: #e67e22;
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* ========================
   AUTH BUTTON
   ======================== */
.silkflex-login-page .auth-btn {
    width: 100%;
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    outline: none;
    font-family: inherit;
    user-select: none;
}

.silkflex-login-page .auth-btn.primary {
    background: linear-gradient(135deg, #ff8c42, #ffa726);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 140, 66, 0.3);
}

.silkflex-login-page .auth-btn.primary::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;
}

.silkflex-login-page .auth-btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 140, 66, 0.4);
}

.silkflex-login-page .auth-btn.primary:hover::before {
    left: 100%;
}

.silkflex-login-page .auth-btn.primary:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(255, 140, 66, 0.3);
}

.silkflex-login-page .auth-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ========================
   DIVIDER
   ======================== */
.silkflex-login-page .divider {
    text-align: center;
    margin: 2rem 0;
    position: relative;
}

.silkflex-login-page .divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, #ddd, transparent);
}

.silkflex-login-page .divider span {
    background: white;
    padding: 0 1.5rem;
    color: #888;
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

/* ========================
   SOCIAL LOGIN
   ======================== */
.silkflex-login-page .social-login {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
}

.silkflex-login-page .social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.875rem;
    padding: 1rem 1.5rem;
    border: 2px solid #e8e8e8;
    border-radius: 12px;
    background: white;
    color: #444;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    outline: none;
    font-family: inherit;
    user-select: none;
}

.silkflex-login-page .social-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: #ccc;
}

.silkflex-login-page .social-btn.google:hover {
    border-color: #4285F4;
    background: rgba(66, 133, 244, 0.05);
    color: #4285F4;
}

.silkflex-login-page .social-btn.facebook:hover {
    border-color: #1877F2;
    background: rgba(24, 119, 242, 0.05);
    color: #1877F2;
}

.silkflex-login-page .social-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.silkflex-login-page .social-btn svg {
    flex-shrink: 0;
}

/* ========================
   SUCCESS MESSAGE
   ======================== */
.silkflex-login-page .success-message {
    text-align: center;
    padding: 3rem 2rem;
    animation: slideUp 0.6s ease-out;
    background: white;
    border-radius: 0 0 20px 20px;
}

@keyframes slideUp {
    from { 
        opacity: 0; 
        transform: translateY(30px) scale(0.95); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1); 
    }
}

.silkflex-login-page .success-icon {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
}

.silkflex-login-page .success-icon svg {
    filter: drop-shadow(0 4px 8px rgba(39, 174, 96, 0.3));
}

.silkflex-login-page .success-message h3 {
    color: #27ae60;
    margin: 0 0 0.75rem 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.silkflex-login-page .success-message p {
    color: #666;
    margin: 0;
    font-size: 1rem;
}

/* ========================
   ERROR STATES
   ======================== */
.silkflex-login-page .form-group.error input {
    border-color: #e74c3c;
    background: rgba(231, 76, 60, 0.05);
    box-shadow: 0 0 0 4px rgba(231, 76, 60, 0.1);
}

.silkflex-login-page .error-message {
    color: #e74c3c;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    display: none;
    font-weight: 500;
}

.silkflex-login-page .form-group.error .error-message {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* ========================
   LOADING STATES
   ======================== */
.silkflex-login-page .loading {
    position: relative;
    pointer-events: none;
}

.silkflex-login-page .loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ========================
   RESPONSIVE DESIGN
   ======================== */
@media (max-width: 768px) {
    .silkflex-login-page {
        padding: 1rem 0.5rem;
        margin-top: 80px;
    }
    
    .silkflex-login-page .login-container {
        max-width: 100%;
    }
    
    .silkflex-login-page .login-box {
        border-radius: 16px;
        margin: 0 0.5rem;
    }
    
    .silkflex-login-page .login-header {
        padding: 2rem 1.5rem 1.5rem;
    }
    
    .silkflex-login-page .login-logo-img {
        height: 50px;
    }
    
    .silkflex-login-page .tab-content {
        padding: 2rem 1.5rem;
    }
    
    .silkflex-login-page .tab-btn {
        padding: 1rem 0.75rem;
        font-size: 0.95rem;
    }
    
    .silkflex-login-page .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.875rem;
    }
    
    .silkflex-login-page .social-login {
        gap: 0.75rem;
    }
    
    .silkflex-login-page .social-btn {
        font-size: 0.9rem;
        padding: 0.875rem 1.25rem;
    }
}

@media (max-width: 480px) {
    .silkflex-login-page {
        padding: 0.5rem 0.25rem;
    }
    
    .silkflex-login-page .login-box {
        border-radius: 12px;
        margin: 0 0.25rem;
    }
    
    .silkflex-login-page .tab-content {
        padding: 1.5rem 1rem;
    }
    
    .silkflex-login-page .login-header {
        padding: 1.5rem 1rem 1rem;
    }
    
    .silkflex-login-page .login-logo-img {
        height: 42px;
    }
    
    .silkflex-login-page .login-logo p {
        font-size: 0.9rem;
    }
    
    .silkflex-login-page .tab-btn {
        padding: 0.875rem 0.5rem;
        font-size: 0.9rem;
    }
    
    .silkflex-login-page .form-group input {
        padding: 0.75rem 0.875rem;
        font-size: 0.95rem;
    }
    
    .silkflex-login-page .auth-btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .silkflex-login-page .social-btn {
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
        gap: 0.75rem;
    }
    
    .silkflex-login-page .success-message {
        padding: 2rem 1rem;
    }
    
    .silkflex-login-page .success-message h3 {
        font-size: 1.25rem;
    }
}

/* ========================
   ACCESSIBILITY
   ======================== */
.silkflex-login-page .tab-btn:focus,
.silkflex-login-page .auth-btn:focus,
.silkflex-login-page .social-btn:focus,
.silkflex-login-page .form-group input:focus {
    outline: 3px solid #ff8c42;
    outline-offset: 2px;
}

.silkflex-login-page .checkbox-label:focus-within .checkmark {
    outline: 2px solid #ff8c42;
    outline-offset: 2px;
}

/* ========================
   PRINT STYLES
   ======================== */
@media print {
    .silkflex-login-page {
        background: white;
        margin: 0;
        padding: 0;
    }
    
    .silkflex-login-page .login-box {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .silkflex-login-page .login-header {
        background: #f5f5f5;
        color: #333;
    }
    
    .silkflex-login-page .social-login {
        display: none;
    }
}