/* css/style.css - Final Version */

:root {
    /* 核心綠色 (User Specified RGB) */
    --primary-green: rgb(57, 124, 45);
    --dark-green: rgb(40, 90, 30);
    --accent-green: #6EBF5E;

    /* 背景與色彩變數 */
    --bg-color: #F3F5F3;  /* 極淡灰綠色背景 */
    --card-bg: #FFFFFF;
    --text-main: #333333;
    --text-white: #FFFFFF;
    --text-light: #666666;

    /* Layout tokens */
    --max-width: 1200px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --transition: 0.3s ease;
}

/* --- Accessibility: Skip Link --- */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--primary-green);
    color: var(--text-white);
    padding: 10px 16px;
    z-index: 1100;
    text-decoration: none;
}
.skip-link:focus {
    left: 10px;
    top: 10px;
    outline: 2px solid var(--text-white);
    outline-offset: 2px;
}

/* Visible focus for keyboard users */
.hamburger:focus-visible,
.nav-links a:focus-visible,
.card a:focus-visible,
.skip-link:focus-visible {
    outline: 2px solid var(--accent-green);
    outline-offset: 3px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: "Helvetica Neue", Arial, "PingFang TC", "Microsoft JhengHei", sans-serif;
    line-height: 1.7; /* 增加行高，閱讀更舒適 */
    color: var(--text-main);
    background-color: var(--bg-color);
}

a { text-decoration: none; color: inherit; transition: color var(--transition), background-color var(--transition); }
ul { list-style: none; }

img { max-width: 100%; height: auto; display: block; }

/* --- Header & Navigation --- */
header {
    background: var(--primary-green); /* 滿版綠色 */
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 15px 20px;
}

.logo img {
    height: 45px; 
    width: auto;
    display: block;
    border: none; /* 移除白框，確保與背景融合 */
}

.nav-links { display: flex; gap: 30px; }

.nav-links li a {
    font-weight: 500;
    color: var(--text-white);
    padding: 8px 0;
    font-size: 1rem;
    text-transform: uppercase;
    position: relative;
    letter-spacing: 1px;
}

/* 導航連結 Hover 動畫 */
.nav-links li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--text-white);
    transition: 0.3s;
}

.nav-links li a:hover::after,
.nav-links li a.active::after {
    width: 100%;
}

.hamburger { display: none; cursor: pointer; font-size: 1.5rem; color: var(--text-white); }

/* --- Hero Section (首頁大圖) --- */
.hero {
    width: 100%;
    height: clamp(320px, 65vh, 640px);
    /* JPEG fallback for older browsers */
    background-image: url('../images/hero.jpg');
    /* WebP with type negotiation for modern browsers */
    background-image: image-set(
        url('../images/hero.webp') type('image/webp'),
        url('../images/hero.jpg') type('image/jpeg')
    );
    background-size: cover;
    background-position: center;
    position: relative;
}

/* Screen-reader-only utility for headings/labels we don't want visible */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Content Layout --- */
.container {
    max-width: var(--max-width);
    margin: 50px auto;
    padding: 0 20px;
    min-height: 50vh;
}

section { margin-bottom: 60px; }

.page-title {
    color: var(--primary-green);
    border-left: 8px solid var(--primary-green);
    padding-left: 15px;
    margin-bottom: 30px;
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

p { 
    margin-bottom: 20px; 
    color: #444; 
    font-size: 1.05rem;
    /* 修正排版：強制靠左對齊，避免單字間距過大 */
    text-align: left; 
}

/* --- Grid System & Cards --- */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.card {
    background: var(--card-bg);
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05); 
    border-radius: 4px;
    border-top: 5px solid var(--primary-green);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.card h2 {
    color: var(--dark-green);
    font-size: 1.4rem;
    margin-bottom: 15px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

.card strong { color: var(--text-main); }

/* --- Engagement Model (scoped so it doesn't affect .consultant-title) --- */
#engagement-model h3 {
    color: var(--dark-green);
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

/* --- About Us List Style --- */
.sector-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.sector-list li {
    font-size: 1rem;
    color: var(--text-main);
    padding: 10px 14px;
    background: #f9f9f9;
    border-left: 4px solid var(--primary-green);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* --- Consultants Page --- */
.consultant-title {
    display: block;
    color: var(--text-light);
    font-weight: bold;
    margin: 0 0 15px 0;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.consultant-contact {
    margin-top: 10px;
    font-weight: bold;
}

.consultant-contact a {
    color: var(--primary-green);
    text-decoration: underline;
}

/* --- Contact Page Layout --- */
.contact-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
}

.contact-info .card + .card {
    margin-top: 20px;
}

.contact-info h2 {
    color: var(--primary-green);
    font-size: 1.3rem;
    border-bottom: none;
    padding-bottom: 0;
}

.contact-info a {
    color: var(--primary-green);
    text-decoration: underline;
}

.map-container iframe,
.contact-map {
    border: 0;
    min-height: 450px;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* --- Footer --- */
footer {
    background: #1a1a1a;
    color: #ccc;
    text-align: center;
    padding: 40px 20px;
    border-top: 5px solid var(--primary-green);
}

footer p {
    color: #888;
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 0;
}

/* --- RWD 手機版設定 (更強壯的版本) --- */
@media (max-width: 768px) {
    /* 1. 導航列調整 */
    .navbar {
        padding: 15px 20px;
        position: relative; /* 確保子元素定位正確 */
    }

    /* 2. 讓漢堡按鈕現身 */
    .hamburger {
        display: block;
        font-size: 2rem; /* 字變大一點 */
        color: var(--text-white);
        cursor: pointer;
        line-height: 1; /* 避免行高導致位置跑掉 */
    }

    /* 3. 手機版選單 (預設隱藏) */
    .nav-links {
        display: none; /* 平常隱藏 */
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%; /* 剛好接在 Header 下方 */
        left: 0;
        background-color: var(--primary-green); /* 確保背景色是綠色 */
        border-top: 1px solid rgba(255,255,255,0.2);
        box-shadow: 0 5px 10px rgba(0,0,0,0.2);
    }

    /* 4. 當被加上 active 類別時 (顯示出來) */
    .nav-links.active {
        display: flex; /* 變成彈性盒子顯示 */
    }

    /* 5. 選單項目樣式 */
    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links li a {
        display: block;
        padding: 20px; /* 增加點擊範圍 */
        color: var(--text-white);
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .nav-links li a:hover {
        background-color: rgba(0,0,0,0.1);
    }

    .container {
        margin: 30px auto;
    }

    .page-title {
        font-size: 1.6rem;
    }
}

/* --- RWD: very small phones --- */
@media (max-width: 480px) {
    .navbar {
        padding: 12px 15px;
    }

    .logo img {
        height: 38px;
    }

    .card {
        padding: 22px;
    }

    .grid-container {
        gap: 20px;
    }
}

/* --- RWD: tablets (769px - 1024px) --- */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        margin: 40px auto;
        padding: 0 30px;
    }

    .grid-container {
        gap: 24px;
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    }

    .card {
        padding: 26px;
    }

    section {
        margin-bottom: 48px;
    }
}

/* --- RWD: large desktops --- */
@media (min-width: 1440px) {
    :root {
        --max-width: 1320px;
    }
}

/* --- Reduced motion preference --- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
    }

    .card:hover {
        transform: none;
    }
}