/**
 * NAKAMA 柔道會網站 - 主要樣式表
 * Bootstrap 5.3.0 自訂與擴充
 */

/* ============================================
   CSS 變數定義
   ============================================ */
:root {
    /* 品牌色彩 */
    --color-primary: #000000;      /* 黑色 */
    --color-secondary: #FFD700;    /* 金色 */
    --color-white: #FFFFFF;        /* 白色 */
    --color-gray-light: #F5F5F5;
    --color-gray: #999999;
    --color-gray-dark: #333333;
    
    /* 字體 */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    --font-chinese: "Microsoft JhengHei", "PingFang TC", "Heiti TC", sans-serif;
    
    /* 間距 */
    --spacing-xs: 0.5rem;    /* 8px */
    --spacing-sm: 1rem;      /* 16px */
    --spacing-md: 2rem;      /* 32px */
    --spacing-lg: 3rem;      /* 48px */
    --spacing-xl: 4rem;      /* 64px */
    
    /* 陰影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    
    /* 轉場 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ============================================
   全域樣式
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary), var(--font-chinese);
    color: var(--color-gray-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 中文字體優化 */
:lang(zh) {
    font-family: var(--font-chinese), var(--font-primary);
}

/* 連結樣式 */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary);
}

/* ============================================
   Bootstrap 覆寫
   ============================================ */

/* 按鈕 */
.btn {
    padding: 0.75rem 2rem;
    font-weight: 600;
    border-radius: 0;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-primary {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-primary);
}

.btn-secondary {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* 卡片 */
.card {
    border: none;
    border-radius: 0;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   導航列
   ============================================ */
.navbar {
    background-color: var(--color-primary);
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-white) !important;
    letter-spacing: 2px;
}

.navbar-brand:hover {
    color: var(--color-secondary) !important;
}

.navbar-nav .nav-link {
    color: var(--color-white) !important;
    padding: 0.5rem 1rem;
    transition: color var(--transition-fast);
    font-weight: 500;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--color-secondary) !important;
}

/* 語言切換按鈕 */
.lang-switcher {
    display: flex;
    gap: 0.5rem;
}

.lang-switcher .btn {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    min-width: 40px;
}

.lang-switcher .btn.active {
    background-color: var(--color-secondary);
    color: var(--color-primary);
}

/* 手機版選單 */
.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 215, 0, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ============================================
   Hero 區塊
   ============================================ */
.hero,
.page-hero {
    position: relative;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-gray-dark) 100%);
    color: var(--color-white);
    padding: 10rem 0 8rem 0;  /* 增加高度 */
    text-align: center;
    overflow: hidden;
    min-height: 450px; /* 確保最小高度 */
}

.hero.hero-home {
    min-height: 600px; /* 首頁更高 */
    padding: 12rem 0 10rem 0;
}

/* 所有頁面都使用背景圖 */
.hero,
.page-hero {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.7) 0%, rgba(26, 26, 26, 0.7) 100%),
                url('../images/slide_00-1.jpg') center/cover no-repeat;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="rgba(255,215,0,0.1)"/></svg>');
    background-size: 200px;
    opacity: 0.3;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(100px, 100px); }
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

.hero .btn {
    position: relative;
    z-index: 1;
}

/* ============================================
   區塊標題
   ============================================ */
.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    display: inline-block;
    /* left: 50%; */
    /* transform: translateX(-50%); */
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--color-secondary);
}

.section-title.text-start {
    left: 0;
    transform: none;
    text-align: left;
}

.section-title.text-start::after {
    left: 0;
    transform: none;
}

/* ============================================
   特色卡片
   ============================================ */
.feature-card {
    text-align: center;
    padding: var(--spacing-md);
    height: 100%;
}

.feature-card i {
    font-size: 3rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   新聞卡片
   ============================================ */
.news-card {
    overflow: hidden;
    position: relative;
}

.news-card[data-detail-url] {
    cursor: pointer;
}

.news-card img {
    width: 100%;
    height: 250px;
    object-fit: contain;
    background-color: #f8f9fa; /* 填充空白區域的背景色 */
    transition: transform var(--transition-slow);
}

.news-card:hover img {
    transform: scale(1.1);
}

.news-card .card-body {
    padding: var(--spacing-md);
}

.news-card .badge {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    padding: 0.5rem 1rem;
    font-weight: 600;
}

/* ============================================
   時間表
   ============================================ */
.schedule-table {
    width: 100%;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.schedule-table thead {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.schedule-table th,
.schedule-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

.schedule-table tbody tr:hover {
    background-color: var(--color-gray-light);
}

/* ============================================
   頁尾
   ============================================ */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer h5 {
    color: var(--color-secondary);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.footer a {
    color: var(--color-white);
    display: block;
    padding: 0.25rem 0;
}

.footer a:hover {
    color: var(--color-secondary);
    padding-left: 5px;
}


.footer .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-white);
    color: var(--color-primary);
    border-radius: 50%;
    margin-right: 0.5rem;
    transition: all var(--transition-fast);
}

.footer .social-links svg {
    width: 18px;
    height: 18px;
}

.footer .social-links a:hover {
    background-color: var(--color-secondary);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    text-align: center;
    font-size: 0.875rem;
}

/* ============================================
   表單樣式
   ============================================ */
.form-control,
.form-select {
    border-radius: 0;
    padding: 0.75rem;
    border: 2px solid #dee2e6;
    transition: border-color var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-secondary);
    box-shadow: none;
}

textarea.form-control {
    min-height: 150px;
}

/* ============================================
   響應式設計
   ============================================ */

/* 平板 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* 手機 */
@media (max-width: 768px) {
    .hero,
    .page-hero {
        padding: 6rem 0 4rem 0;  /* 手機版保持上方間距 */
    }
    
    .hero h1,
    .page-hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .section {
        padding: var(--spacing-md) 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .btn {
        padding: 0.5rem 1.5rem;
        font-size: 0.875rem;
    }
    
    .footer {
        text-align: center;
        padding: 2rem 0 1rem 0;
    }
    
    .footer .col-md-4 {
        margin-bottom: 1.5rem;
    }
    
    .footer h5 {
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }
    
    .footer p {
        font-size: 0.85rem;
        line-height: 1.4;
    }
    
    .footer a {
        font-size: 0.85rem;
        padding: 0.25rem 0;
    }
    
    .footer .social-links {
        justify-content: center;
        margin-top: 0.75rem !important;
    }
    
    .footer .social-links a {
        width: 36px;
        height: 36px;
    }
    
    .footer-bottom {
        padding-top: 1rem;
        margin-top: 1.5rem;
        font-size: 0.75rem;
    }
}

/* Footer 聯絡資訊對齊 */
.footer .col-md-4 p {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.footer .col-md-4 p .icon-inline {
    flex-shrink: 0;
}

/* ============================================
   工具類別
   ============================================ */
.text-gold {
    color: var(--color-secondary) !important;
}

.icon-inline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    vertical-align: middle;
}

.icon-inline svg {
    width: 100%;
    height: 100%;
    display: block;
}

.social-icon-btn {
    width: 50px;
    height: 50px;
    border: 1px solid var(--color-gray-dark);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-dark);
    transition: all var(--transition-normal);
}

.social-icon-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.social-icon-btn svg {
    width: 20px;
    height: 20px;
}

.contact-submit-btn {
    text-transform: none;
    letter-spacing: 0;
    padding: 0.65rem 1.5rem;
    font-size: 1rem;
}

.placeholder-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.placeholder-icon svg {
    width: 64px;
    height: 64px;
}

.bg-gold {
    background-color: var(--color-secondary) !important;
}

.bg-light-gray {
    background-color: var(--color-gray-light);
}

/* 載入動畫 */
.loading {
    text-align: center;
    padding: var(--spacing-lg);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 50px;
    height: 50px;
    border: 5px solid var(--color-gray-light);
    border-top-color: var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 返回頂部按鈕 */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-secondary);
    color: var(--color-primary);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

#backToTop.show {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}