/* ===================================
   雙行導航欄設計
   第一行：Logo + 語言切換 + 登入/註冊
   第二行：頁面導航連結
   =================================== */

/* 覆蓋原有導航欄樣式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 0;
    transition: all 0.3s ease;
    border-bottom: 2px solid rgba(16, 185, 129, 0.3);
}

/* 導航容器改為雙行布局 */
.nav-container {
    width: 100%;
    padding: 0;
    display: flex;
    flex-direction: column;
}

/* 第一行：Logo + 語言 + 認證 */
.nav-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-top-left {
    display: flex;
    align-items: center;
}

.nav-top-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Logo 樣式 */
.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    transition: transform 0.3s ease;
    white-space: nowrap;
}

.logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    font-size: 2rem;
}

/* 第二行：頁面導航 */
.nav-bottom-row {
    display: flex;
    justify-content: center;
    padding: 0 2rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.3rem;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.7rem 1rem;
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-green);
    transition: width 0.3s ease;
}

.nav-link:hover::before {
    width: 80%;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* 語言切換器 */
.language-switcher {
    position: relative;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: all 0.3s;
    font-family: var(--font-main);
    font-size: 0.9rem;
}

.lang-toggle:hover {
    background: rgba(255,255,255,0.15);
    border-color: var(--stage1-color);
}

.lang-toggle i {
    font-size: 1rem;
}

.current-lang {
    font-weight: 500;
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: rgba(15,23,42,0.98);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    min-width: 180px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    overflow: hidden;
}

.lang-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1.2rem;
    color: white;
    text-decoration: none;
    transition: all 0.3s;
}

.lang-option:hover {
    background: rgba(255,255,255,0.1);
}

.lang-option.active {
    background: rgba(16,185,129,0.2);
    color: var(--stage1-color);
}

.lang-flag {
    font-size: 1.2rem;
}

/* 認證按鈕組 */
.auth-buttons {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.btn-login,
.btn-register {
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-login {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
}

.btn-login:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.4);
}

.btn-register {
    background: var(--stage1-color);
    color: white;
}

.btn-register:hover {
    background: #0D9668;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(16,185,129,0.3);
}

/* 用戶菜單 */
.user-menu {
    position: relative;
}

.user-toggle {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 1rem 0.4rem 0.4rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 25px;
    color: white;
    cursor: pointer;
    transition: all 0.3s;
}

.user-toggle:hover {
    background: rgba(255,255,255,0.15);
    border-color: var(--stage1-color);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(255,255,255,0.3);
}

.user-name {
    font-weight: 500;
    font-size: 0.9rem;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: rgba(15,23,42,0.98);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 10px;
    min-width: 220px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s;
    overflow: hidden;
}

.user-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown-header {
    padding: 1rem 1.2rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.user-dropdown-name {
    font-weight: 600;
    color: white;
    margin-bottom: 0.3rem;
}

.user-dropdown-email {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
}

.user-dropdown-menu {
    padding: 0.5rem 0;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 1.2rem;
    color: white;
    text-decoration: none;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-family: var(--font-main);
    font-size: 0.9rem;
}

.user-dropdown-item:hover {
    background: rgba(255,255,255,0.1);
    color: var(--stage1-color);
}

.user-dropdown-item i {
    width: 20px;
    text-align: center;
    opacity: 0.7;
}

.user-dropdown-divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 0.5rem 0;
}

/* 手機菜單切換按鈕 */
.mobile-menu-toggle {
    display: none;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.mobile-menu-toggle:hover {
    background: rgba(255,255,255,0.2);
}

/* 響應式設計 */
@media (max-width: 1200px) {
    .nav-link {
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
    }
    
    .logo {
        font-size: 1.3rem;
    }
}

@media (max-width: 1024px) {
    .nav-top-row,
    .nav-bottom-row {
        padding: 0.6rem 1rem;
    }
    
    .nav-link {
        padding: 0.5rem 0.7rem;
        font-size: 0.8rem;
    }
    
    .user-name {
        display: none; /* 在平板上隱藏用戶名稱 */
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-top-right {
        gap: 0.8rem;
    }
    
    /* 隱藏桌面版語言切換器 */
    .language-switcher {
        display: none;
    }
    
    /* 隱藏桌面版認證按鈕 */
    .auth-buttons {
        display: none;
    }
    
    /* 隱藏桌面版導航菜單 */
    .nav-bottom-row {
        display: none;
    }
    
    /* 顯示手機菜單 */
    .nav-bottom-row.show {
        display: flex;
        flex-direction: column;
        padding: 1rem;
        border-top: 1px solid rgba(255,255,255,0.1);
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: 0.5rem;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        width: 100%;
        justify-content: flex-start;
        padding: 1rem;
    }
    
    /* 手機版用戶菜單 */
    .user-menu {
        width: 100%;
    }
    
    .user-toggle {
        width: 100%;
        justify-content: space-between;
        padding: 0.6rem 1rem;
        border-radius: 8px;
    }
    
    .user-dropdown {
        position: static;
        width: 100%;
        margin-top: 0.5rem;
        border-radius: 8px;
    }
}

/* 階段標籤樣式保持不變 */
.stage-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.2rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 12px;
    margin-right: 0.3rem;
}

.stage-1 .stage-badge {
    background: rgba(16,185,129,0.2);
    color: var(--stage1-color);
}

.stage-2 .stage-badge {
    background: rgba(59,130,246,0.2);
    color: var(--stage2-color);
}

.stage-3 .stage-badge {
    background: rgba(139,92,246,0.2);
    color: var(--stage3-color);
}

.stage-4 .stage-badge {
    background: rgba(245,158,11,0.2);
    color: var(--stage4-color);
}

/* 確保頁面內容不被導航欄遮擋 */
body {
    padding-top: 120px; /* 調整以適應雙行導航欄 */
}

@media (max-width: 768px) {
    body {
        padding-top: 70px; /* 手機版單行導航欄 */
    }
}