/* ==========================================
   Login Page - Content Layer Styles
   登入頁面 - 內容層樣式
   
   File: /public/css/pages/auth/login.css
   Version: 5.0 - Redesigned (結構樣式行為分離)
   Date: 2025-10-14
   Author: SuperClaude Framework
   
   職責: 登入頁面特定的局部內容樣式
   依賴: auth-master.css (基礎結構與CSS變數)
   
   設計原則:
   ✓ 只負責內容層樣式 (不定義 layout 結構)
   ✓ 使用 auth-master.css 的 CSS 變數
   ✓ 遵循 BEM 命名規範
   ✓ 專注於互動效果和動畫
   
   架構:
/* ========================================
   1. Login Tabs - 登入方式切換標籤 (FIXED)
   修復: 白色卡片背景下的可見性問題
   ======================================== */

/* ========================================
   1. Login Tabs - 登入方式切換標籤 (FIXED)
   修復: 白色卡片背景下的可見性問題
   ======================================== */

/* Tab Container */
.login-tabs {
    display: flex;
    gap: 12px;
    margin-bottom: var(--auth-space-lg);
    padding: 4px;
    /* 修復: 使用淺灰色背景替代半透明白色 */
    background: #F7FAFC;
    border: 1px solid #E2E8F0;
    border-radius: var(--auth-radius-md);
}

/* Tab Button */
.login-tabs__tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 20px;
    background: transparent;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    /* 修復: 使用深灰色文字替代半透明白色 */
    color: #718096;
    cursor: pointer;
    transition: all var(--auth-transition-normal);
    position: relative;
    overflow: hidden;
}

/* Tab Hover State */
.login-tabs__tab:hover:not(.login-tabs__tab--active) {
    /* 修復: 使用淺灰色背景 */
    background: #EDF2F7;
    color: #4A5568;
    transform: translateY(-1px);
}

/* Tab Active State */
.login-tabs__tab--active {
    /* 保持漸層背景 */
    background: var(--auth-gradient);
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* Tab Focus State (Accessibility) */
.login-tabs__tab:focus-visible {
    outline: 2px solid var(--auth-primary);
    outline-offset: 2px;
}

/* Tab Icon Styling */
.login-tabs__tab svg {
    transition: transform var(--auth-transition-fast);
    stroke-width: 2.5;
}

.login-tabs__tab:hover svg {
    transform: scale(1.1);
}

.login-tabs__tab--active svg {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}
   3. Input Enhancements - 輸入框增強效果
   ======================================== */

/* Enhanced Focus State */
.auth-page__input:focus {
    border-color: var(--auth-focus-border);
    box-shadow: var(--auth-focus-shadow);
    transform: scale(1.01);
    transition: all var(--auth-transition-fast);
}

/* Error State with Shake Animation */
.auth-page__input--error {
    border-color: var(--auth-error);
    background-color: var(--auth-error-bg);
    animation: shake 0.4s ease;
}

/* Success/Valid State */
.auth-page__input--valid {
    border-color: var(--auth-success);
    background-color: var(--auth-success-bg);
}

/* Success Checkmark Icon */
.auth-page__input--valid + .auth-page__input-success-icon {
    display: block;
    position: absolute;
    right: 48px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--auth-success);
    animation: scaleIn 0.3s ease;
}

/* Error Message */
.auth-page__error {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--auth-error);
    font-size: 13px;
    margin-top: var(--auth-space-sm);
    animation: slideDown 0.3s ease;
}

/* Icon Color Theming by Field Type */
.auth-page__input-wrapper:has(#email) .auth-page__input-icon svg,
.auth-page__input-wrapper:has(#verification_email) .auth-page__input-icon svg {
    stroke: #4299E1; /* Blue for email */
}

.auth-page__input-wrapper:has(#password) .auth-page__input-icon svg {
    stroke: var(--auth-primary); /* Purple for password */
}

.auth-page__input-wrapper:has(#verification_code) .auth-page__input-icon svg {
    stroke: var(--auth-success); /* Green for verification */
}

/* ========================================
   4. Button Enhancements - 按鈕增強效果
   ======================================== */

/* Primary Button Enhancement */
.auth-page__button--primary {
    position: relative;
    overflow: hidden;
}

/* Shimmer Effect on Hover */
.auth-page__button--primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    transition: left 0.5s ease;
}

.auth-page__button--primary:hover:not(:disabled)::before {
    left: 100%;
}

/* Active Press Effect */
.auth-page__button--primary:active:not(:disabled) {
    transform: scale(0.98);
}

/* Disabled State */
.auth-page__button--primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading State */
.auth-page__button--loading {
    pointer-events: none;
    opacity: 0.8;
}

/* Outline Button Enhancement */
.auth-page__button--outline {
    transition: all var(--auth-transition-normal);
}

.auth-page__button--outline:hover:not(:disabled) {
    background: rgba(102, 126, 234, 0.1);
    border-color: var(--auth-primary);
    transform: translateY(-1px);
}

/* Google Button Specific Styling */
.auth-page__button--google {
    transition: all var(--auth-transition-normal);
}

.auth-page__button--google:hover {
    box-shadow: var(--auth-shadow-md);
    transform: translateY(-2px);
}

.auth-page__button--google svg {
    transition: transform var(--auth-transition-fast);
}

.auth-page__button--google:hover svg {
    transform: rotate(5deg) scale(1.1);
}

/* Button Focus State */
.auth-page__button:focus-visible {
    outline: 2px solid var(--auth-primary);
    outline-offset: 2px;
}

/* ========================================
   5. UI Elements - UI元素樣式
   ======================================== */

/* Divider Enhancement */
.auth-page__divider {
    position: relative;
    margin: var(--auth-space-xl) 0;
}

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

.auth-page__divider-text {
    position: relative;
    display: inline-block;
    padding: 0 var(--auth-space-md);
    background: var(--auth-bg-card);
    color: var(--auth-text-muted);
    font-size: 14px;
}

/* Link Enhancement */
.auth-page__link {
    position: relative;
    transition: color var(--auth-transition-fast);
}

.auth-page__link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: var(--auth-primary);
    transition: width var(--auth-transition-normal);
}

.auth-page__link:hover::after {
    width: 100%;
}

.auth-page__link:hover {
    color: var(--auth-primary);
}

.auth-page__link:focus-visible {
    outline: 2px solid var(--auth-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Checkbox Custom Styling */
.auth-page__checkbox-input:checked + .auth-page__checkbox-label::before {
    background: var(--auth-primary);
    border-color: var(--auth-primary);
    animation: checkBounce 0.3s ease;
}

/* Logo Enhancement (if needed in login page) */
.auth-page__logo {
    animation: fadeIn 0.6s ease;
}

/* Spinner for Loading States */
.auth-page__spinner {
    animation: spin 1s linear infinite;
}

/* ========================================
   6. Animations - 關鍵幀動畫
   ======================================== */

/* Shake Animation for Errors */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
    20%, 40%, 60%, 80% { transform: translateX(8px); }
}

/* Scale In Animation for Success Icons */
@keyframes scaleIn {
    0% {
        transform: translateY(-50%) scale(0);
        opacity: 0;
    }
    50% {
        transform: translateY(-50%) scale(1.2);
    }
    100% {
        transform: translateY(-50%) scale(1);
        opacity: 1;
    }
}

/* Slide Down Animation for Error Messages */
@keyframes slideDown {
    0% {
        opacity: 0;
        transform: translateY(-8px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade In Animation for Content */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Spin Animation for Spinners */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Check Bounce Animation for Checkboxes */
@keyframes checkBounce {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* ========================================
   7. Responsive - 響應式調整
   ======================================== */

/* Mobile Devices (< 768px) */
@media (max-width: 767px) {
    .login-tabs {
        gap: 8px;
        padding: 3px;
    }
    
    .login-tabs__tab {
        padding: 12px 16px;
        font-size: 14px;
        gap: 8px;
    }
    
    /* Reduce animation intensity on mobile */
    .auth-page__input:focus {
        transform: none; /* 移除 scale 效果避免移動端輸入問題 */
    }
    
    .auth-page__button--primary:hover:not(:disabled)::before {
        animation: none; /* 移動端不顯示 shimmer 效果 */
    }
}

/* Tablet Devices (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .login-tabs {
        gap: 10px;
    }
    
    .login-tabs__tab {
        padding: 13px 18px;
    }
}

/* Desktop Devices (> 1024px) */
@media (min-width: 1025px) {
    /* Enhanced hover effects for desktop */
    .login-tabs__tab:hover:not(.login-tabs__tab--active) {
        transform: translateY(-2px);
    }
    
    .auth-page__button--google:hover {
        transform: translateY(-3px);
        box-shadow: var(--auth-shadow-lg);
    }
}

/* Accessibility: Reduce Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms;
        animation-iteration-count: 1;
        transition-duration: 0.01ms;
    }
}

/* Dark Mode Support (Future Enhancement) */
@media (prefers-color-scheme: dark) {
    /* 預留深色模式支援 */
    /* 目前登入頁使用固定漸層背景，暫不啟用 */
}

/* Print Styles */
@media print {
    .login-tabs,
    .auth-page__button--google,
    .auth-page__divider {
        display: none;
    }
}

/* ========================================
   End of Login Page Content Styles
   ======================================== */

/* ========================================
   Google Button Full Width Fix
   ======================================== */

/* 確保Google登入按鈕為全寬 */
.auth-page__button--google {
    width: 100%;
}

/* 社交登入區塊確保按鈕全寬 */
.auth-page__social .auth-page__button {
    width: 100%;
}