/* 基本設定 */
:root {
    --primary-color: #00f2fe; /* 亮青色 - 象徵年輕與活力 */
    --secondary-color: #4facfe;
    --bg-dark: #0f172a;
    --text-light: #f8fafc;
    --accent-pink: #f472b6;
}

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

body {
    font-family: 'Noto Sans TC', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    overflow-x: hidden;
    line-height: 1.6;
}

/* 背景裝飾 */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 80%);
    z-index: -1;
}

/* 容器佈局 */
.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    text-align: center;
}

/* Logo 設計 */
.logo {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: -1px;
    color: var(--text-light);
}

.logo span {
    color: var(--primary-color);
}

/* 主內容區 */
.content {
    max-width: 800px;
    z-index: 1;
}

h1 {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 900;
    text-transform: uppercase;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.2rem;
    color: var(--accent-pink);
    font-weight: 700;
    margin-bottom: 2rem;
    letter-spacing: 2px;
}

.sub-intro {
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    margin-bottom: 1rem;
    padding: 0 10px;
}

.desc {
    font-size: 1.1rem;
    color: #94a3b8;
    margin-bottom: 3rem;
}

/* 按鈕與進度條 */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 700;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 10px 20px rgba(0, 242, 254, 0.2);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 242, 254, 0.4);
}

.progress-container {
    margin-bottom: 2rem;
    width: 250px;
    margin-inline: auto;
}

.progress-bar {
    background: #1e293b;
    height: 8px;
    border-radius: 10px;
    margin-top: 10px;
    overflow: hidden;
}

.progress-fill {
    width: 20%; /* 模擬進度 */
    height: 100%;
    background: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
}

/* 頁尾 */
footer {
    margin-top: 3rem;
    font-size: 0.9rem;
    color: #64748b;
}

.contact-info a {
    color: var(--text-light);
    text-decoration: none;
    border-bottom: 1px solid var(--secondary-color);
}

.copyright {
    margin-top: 1rem;
}

/* RWD 微調 */
@media (max-width: 600px) {
    .container {
        padding: 1.5rem;
    }
    .desc {
        font-size: 0.95rem;
    }
}