:root {
    --bg-color: #f1f5f9;
    --surface-color: #ffffff;
    --primary-color: #049faa;
    --text-color: #0f172a;
    --text-secondary: #64748b;
    --font-family: 'Inter', 'Roboto', 'Noto Sans TC', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--surface-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 1rem;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--primary-color);
}

.lang-switch {
    background: none;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    margin-left: 1rem;
    transition: all 0.3s ease;
}

.lang-switch:hover {
    background-color: var(--primary-color);
    color: var(--bg-color);
}

main {
    flex: 1;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    width: 100%;
}

h1, h2, h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    margin-top: 2rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.hero {
    text-align: center;
    padding: 4rem 1rem;
    background-color: var(--surface-color);
    border-radius: 12px;
    margin-top: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    margin-top: 0;
}

.hero p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.download-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 0.8rem 2rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(4, 159, 170, 0.4);
}

.content-section {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.content-section h2 {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 0.5rem;
}

ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--surface-color);
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: auto;
}

/* 語言切換邏輯 */
.lang-en { display: none; }
html[lang="en"] .lang-en { display: block; }
html[lang="en"] span.lang-en, html[lang="en"] a.lang-en, html[lang="en"] h1.lang-en, html[lang="en"] h2.lang-en, html[lang="en"] p.lang-en { display: inline-block; }
html[lang="en"] .lang-zh { display: none; }

/* 跑馬燈樣式 */
.marquee-container {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--bg-color);
    padding: 10px 0;
    overflow: hidden;
    position: relative;
    font-weight: bold;
    font-size: 1.1em;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.marquee {
    white-space: nowrap;
    display: inline-block;
    animation: marquee 15s linear infinite;
}
@keyframes marquee {
    0% { transform: translateX(100vw); }
    100% { transform: translateX(-100%); }
}

/* 公告彈窗樣式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 20px;
    max-width: 90%;
    width: 400px;
    position: relative;
    text-align: center;
    border: 3px solid var(--primary-color);
    box-shadow: 0 10px 30px rgba(4, 159, 170, 0.2);
}
.close-btn {
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 30px;
    cursor: pointer;
    color: var(--text-color);
    transition: color 0.3s;
}
.close-btn:hover {
    color: var(--primary-color);
}
.visitor-counter {
    margin-top: 10px;
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: bold;
}