/* ---
    Stone Research - UI/UX Enhancement v7.6 (Final & Polished)
    Theme: Espresso & Gold
    --- */

/* --- 1. 核心變數與全域設定 --- */
:root {
    --color-background: #FDFBF6;
    --color-surface: #FFFFFF;
    --color-subtle-bg: #F5F2ED;
    --color-text: #5c524b; 
    --color-heading: #3A302A;
    --color-primary: #8a796b;
    --color-accent: #B99767;
    --color-border: #EAE2D8;

    --font-en: 'Lato', sans-serif;
    --font-ko: 'Noto Sans KR', sans-serif;
    --font-ja: 'Noto Sans JP', sans-serif;
    --font-zh-TW: 'Noto Sans TC', sans-serif;
    --font-zh-CN: 'Noto Sans SC', sans-serif;
    
    --font-display: 'Playfair Display', serif;
    --font-serif: 'Nanum Myeongjo', serif;

    --font-size-base: 14px;
    --font-size-sm: 0.857rem; /* 12px */
    --font-size-md: 0.928rem; /* 13px */
    --font-size-lg: 1.071rem; /* 15px */

    --shadow-sm: 0 4px 12px rgba(67, 56, 49, 0.05);
    --shadow-md: 0 10px 30px rgba(67, 56, 49, 0.08);
    --border-radius: 12px;
    --transition-fast: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* --- 2. 語言專屬字體設定 --- */
body:lang(ko) { font-family: var(--font-ko); }
body:lang(en) { font-family: var(--font-en); }
body:lang(ja) { font-family: var(--font-ja); }
body:lang(zh-TW) { font-family: var(--font-zh-TW); }
body:lang(zh-CN) { font-family: var(--font-zh-CN); }

h1, h2, h3, h4, h5, h6 { font-family: var(--font-serif); color: var(--color-heading); }
.logo a, .hero-content h1 { font-family: var(--font-display); }

/* --- 3. 基礎樣式重設 --- */
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { background-color: var(--color-background); color: var(--color-text); margin: 0; padding-top: 80px; font-size: var(--font-size-base); line-height: 1.8; -webkit-font-smoothing: antialiased; }
body.mobile-menu-active { overflow: hidden; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
*, *:before, *:after { box-sizing: border-box; }

/* --- 4. Header & 導覽列 --- */
.site-header { background: rgba(253, 251, 246, 0.6); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--color-border); padding: 0; position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; transition: var(--transition-fast); height: 80px; }
.site-header.scrolled { box-shadow: var(--shadow-sm); background: rgba(253, 251, 246, 0.85); }
.site-header .container { display: flex; justify-content: space-between; align-items: center; height: 100%; }
.logo a { font-size: 1.5rem; text-decoration: none; color: var(--color-heading); }
.header-actions { display: flex; align-items: center; gap: 20px; }
.member-actions { display: flex; align-items: center; gap: 16px; }
.member-icon svg { width: 24px; height: 24px; color: var(--color-primary); transition: var(--transition-fast); }
.member-icon:hover svg { color: var(--color-accent); }

/* 桌機版導覽列 */
.main-navigation-menu ul { margin: 0; padding: 0; list-style: none; display: flex; gap: 36px; }
.main-navigation-menu a { color: var(--color-primary); text-decoration: none; font-weight: 700; font-size: var(--font-size-sm); position: relative; padding: 5px 0; transition: var(--transition-fast); letter-spacing: 0.5px; }
.main-navigation-menu a:after { content: ''; position: absolute; bottom: -4px; left: 50%; transform: translateX(-50%); width: 0; height: 2px; background: var(--color-accent); transition: var(--transition-fast); }
.main-navigation-menu a:hover { color: var(--color-heading); }
.main-navigation-menu a:hover:after { width: 100%; }

/* 通用語言選單樣式 (桌機與手機共用) */
.language-selector,
.language-selector-mobile { 
    position: relative; 
}
.lang-dropdown-toggle { 
    background: transparent; 
    border: 1px solid var(--color-border); 
    padding: 8px 12px;
    border-radius: 8px; 
    cursor: pointer; 
    font-weight: 700; 
    color: var(--color-primary); 
    transition: var(--transition-fast); 
    display: flex; 
    align-items: center; 
    justify-content: center;
    width: 100%;
    box-sizing: border-box; /* 確保 padding 不會增加寬度 */
}
.lang-dropdown-toggle:hover { 
    background-color: var(--color-subtle-bg); 
    border-color: var(--color-primary);
}
.lang-dropdown-toggle .arrow-down { 
    border: solid var(--color-primary); 
    border-width: 0 2px 2px 0; 
    display: inline-block; 
    padding: 2.5px; 
    transform: rotate(45deg); 
    margin-left: 8px; 
}
.lang-dropdown-menu { 
    display: none; 
    position: absolute; 
    background-color: var(--color-surface); 
    border-radius: var(--border-radius); 
    box-shadow: var(--shadow-md); 
    list-style: none; 
    padding: 8px; 
    margin: 0; 
    min-width: 150px; 
    z-index: 1100; 
    opacity: 0; 
    transform: translateY(10px); 
    transition: opacity 0.2s ease, transform 0.2s ease; 
    box-sizing: border-box;
}
.lang-dropdown-menu.show { 
    display: block; 
    opacity: 1; 
    transform: translateY(0); 
}
.lang-dropdown-toggle,
.lang-button {
    font-family: var(--font-en);
}
.lang-button { 
    display: block; 
    width: 100%; 
    text-align: center; /* 【修改】語言選項文字置中 */
    background: none; 
    border: none; 
    padding: 10px 16px; 
    font-size: var(--font-size-sm); 
    color: var(--color-text); 
    border-radius: 8px; 
    cursor: pointer; 
}
.lang-button:hover { 
    background-color: var(--color-subtle-bg); 
    color: var(--color-heading); 
}
/* 桌機版特定位置 */
.header-actions .lang-dropdown-menu {
    top: calc(100% + 10px); 
    right: 0;
}

/* --- 5. Hero Section --- */
.hero { position: relative; height: auto; min-height: 600px; display: flex; align-items: center; justify-content: center; text-align: center; overflow: hidden; padding: 60px 0; }
.hero-svg-background { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none; }
.hero-svg-background .svg-shape { animation: svg-float 12s ease-in-out infinite alternate; }
.hero-svg-background .shape2 { animation-direction: alternate-reverse; animation-duration: 15s; }
@keyframes svg-float { from { transform: translate(0, -20px) rotate(-2deg); } to { transform: translate(0, 20px) rotate(2deg); } }
.hero-content { position: relative; z-index: 2; }
.hero-content h1 { font-size: 3.5rem; line-height: 1.25; margin: 0 0 20px; font-weight: 700; }
.hero-content .hero-subtitle { font-family: var(--font-serif); font-size: 1.05rem; color: var(--color-primary); margin-bottom: 32px; }
.button.primary-button { background-color: var(--color-heading); color: white; padding: 12px 32px; border-radius: 50px; text-decoration: none; font-weight: 700; transition: var(--transition-fast); box-shadow: var(--shadow-sm); font-size: var(--font-size-md); }
.button.primary-button:hover { background-color: var(--color-accent); transform: translateY(-3px); box-shadow: var(--shadow-md); }

/* --- 6. 區塊通用樣式 --- */
.section-title { font-size: 2rem; margin-bottom: 16px; text-align: center; }
.section-subtitle { font-family: var(--font-body); font-size: var(--font-size-md); color: var(--color-primary); max-width: 600px; text-align: center; margin: 0 auto 70px auto; line-height: 1.7; }
.about-section { background-color: var(--color-surface); padding: 120px 0; position: relative; overflow: hidden; }
.about-content-wrapper { display: grid; grid-template-columns: 1.2fr 1fr; gap: 70px; align-items: center; position: relative; z-index: 2; }
.about-svg-display { display: flex; align-items: center; justify-content: center; height: 100%; min-height: 400px; }
.about-svg-display svg { width: 100%; max-width: 450px; height: auto; animation: svg-breathe 20s ease-in-out infinite alternate; }
.about-text .section-title { text-align: left; }
.about-text p { font-size: var(--font-size-md); margin-bottom: 20px; }
@keyframes svg-breathe { from { transform: scale(0.95) rotate(-5deg); } to { transform: scale(1.05) rotate(5deg); } }
.all-tests-section { background-color: var(--color-subtle-bg); padding: 120px 0; }
.test-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.test-card { text-decoration: none; color: inherit; background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--border-radius); overflow: hidden; box-shadow: var(--shadow-sm); transition: var(--transition-fast); display: flex; flex-direction: column; }
.test-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-md); border-color: var(--color-accent); }
.card-image-container { width: 100%; padding-top: 60%; position: relative; overflow: hidden; }
.card-image-container img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.test-card:hover .card-image-container img { transform: scale(1.05); }
.card-content { padding: 24px; flex-grow: 1; display: flex; flex-direction: column; }
.card-content h3 { font-size: 1.2rem; margin: 0 0 12px; }
.card-content .description { font-size: var(--font-size-sm); color: var(--color-primary); flex-grow: 1; margin-bottom: 20px; }
.card-link { font-weight: 700; font-size: var(--font-size-sm); color: var(--color-accent); align-self: flex-start; transition: var(--transition-fast); }
.test-card:hover .card-link { color: var(--color-heading); padding-left: 8px; }
[data-aos="card-enter"] { transform: translateY(40px) rotate(2deg); opacity: 0; transition-property: transform, opacity; }
[data-aos="card-enter"].aos-animate { transform: translateY(0) rotate(0); opacity: 1; }
[data-aos="zoom-in-title"] { transform: scale(0.9); opacity: 0; transition-property: transform, opacity; }
[data-aos="zoom-in-title"].aos-animate { transform: scale(1); opacity: 1; }

/* --- 7. Footer --- */
.site-footer { background-color: var(--color-background); color: var(--color-primary); padding: 40px 0; text-align: center; font-size: var(--font-size-sm); border-top: 1px solid var(--color-border); }

/* --- 8. Modal --- */
.modal { display: none; position: fixed; z-index: 2000; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgba(0,0,0,0.6); }
.modal-content { position: relative; background-color: #fefefe; margin: 5% auto; padding: 0; border: 1px solid #888; width: 90%; max-width: 960px; box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19); animation-name: animatetop; animation-duration: 0.4s; border-radius: var(--border-radius); overflow: hidden; }
@keyframes animatetop { from {top: -300px; opacity: 0} to {top: 0; opacity: 1} }
.modal-header { padding: 16px 24px; background-color: var(--color-surface); color: var(--color-heading); display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--color-border); }
.modal-header h2 { margin: 0; font-size: 1.25rem; }
.modal-close { color: #aaa; font-size: 28px; font-weight: bold; background: none; border: none; cursor: pointer; }
.modal-close:hover, .modal-close:focus { color: black; }
.modal-body { padding: 0; }
.modal-body iframe { width: 100%; height: 70vh; display: block; border: 0; }

/* --- 9. 響應式設計 --- */
.mobile-menu-trigger, .mobile-nav-menu { display: none; }

@media (max-width: 992px) {
    .main-navigation-menu, .header-actions { display: none; }
    
    .mobile-menu-trigger { display: block; width: 30px; height: 24px; background: none; border: none; padding: 0; cursor: pointer; position: relative; z-index: 1002; }
    .mobile-menu-trigger span { display: block; width: 100%; height: 2.5px; background-color: var(--color-heading); position: absolute; left: 0; transition: all 0.3s ease; border-radius: 2px; }
    .mobile-menu-trigger span:nth-child(1) { top: 0; }
    .mobile-menu-trigger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
    .mobile-menu-trigger span:nth-child(3) { bottom: 0; }
    .mobile-menu-trigger.active span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
    .mobile-menu-trigger.active span:nth-child(2) { opacity: 0; }
    .mobile-menu-trigger.active span:nth-child(3) { top: 50%; transform: translateY(-50%) rotate(-45deg); }
    
    .mobile-nav-menu { display: block; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.4); z-index: 1000; opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s; }
    .mobile-nav-menu.active { opacity: 1; visibility: visible; }
    /* 【修改】選單寬度 */
    .mobile-nav-menu nav { position: absolute; top: 0; right: -250px; width: 250px; height: 100%; background: var(--color-surface); box-shadow: -5px 0 15px rgba(0,0,0,0.1); transition: right 0.4s ease; display: flex; flex-direction: column; padding: 24px; }
    .mobile-nav-menu.active nav { right: 0; }

    .mobile-nav-close {
        position: absolute;
        top: 16px;
        right: 20px;
        font-size: 36px;
        color: var(--color-primary);
        background: none;
        border: none;
        cursor: pointer;
        line-height: 1;
        padding: 0;
    }

    .mobile-nav-menu nav ul { list-style: none; padding: 0; margin: 0; flex-grow: 1; padding-top: 60px; text-align: center; }
    .mobile-nav-menu nav ul li a { display: block; padding: 16px 20px; text-decoration: none; color: var(--color-heading); font-size: 20px; font-weight: 700; transition: background-color 0.2s; }
    .mobile-nav-menu nav ul li a:hover { background-color: var(--color-subtle-bg); }
    
    .mobile-nav-footer { padding-top: 24px; border-top: 1px solid var(--color-border); display: flex; flex-direction: column; gap: 16px; width: 100%; }
    
    .mobile-nav-footer .lang-dropdown-menu {
        bottom: calc(100% + 8px);
        left: 0;
        right: 0;
        transform: translateY(0);
        width: 100%; /* 確保選單與觸發按鈕同寬 */
    }
    .mobile-nav-footer .lang-dropdown-menu.show {
        transform: translateY(0);
    }

    /* 【修改】統一手機版底部按鈕樣式 */
    .mobile-nav-footer .lang-dropdown-toggle,
    .member-action-button {
        padding: 14px;
        font-size: 1rem;
        font-weight: 700;
        border-radius: 8px;
        text-decoration: none;
        transition: var(--transition-fast);
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .member-action-button:active { 
        transform: scale(0.98); 
    }
    .member-action-button.login { 
        background-color: var(--color-heading); 
        color: white; 
    }
    .member-action-button.login:hover { 
        background-color: var(--color-accent); 
    }
    .member-action-button.logout { 
        background-color: #777; 
        color: #fff; 
    }
    .member-action-button.logout:hover { 
        background-color: #999; 
    }
    
    .about-content-wrapper { grid-template-columns: 1fr; gap: 40px; }
    .about-svg-display { position: absolute; top: 0px; left: 50%; transform: translateX(-50%); width: 120%; max-width: 600px; z-index: 1; opacity: 0.03; pointer-events: none; }
    .about-text { position: relative; z-index: 2; }
    .about-text .section-title { text-align: center; }
    .test-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.5rem; }
    .section-title { font-size: 1.8rem; }
    .test-grid { grid-template-columns: 1fr; }
}