/* ==========================================================================
   FineLink 共用樣式表
   兩支 HTML (index.html, 3d-profiler.html) 共用的設計 token、reset、
   header / nav、section 標題、footer 與圖片保護等基底樣式。
   頁面專屬樣式（hero、case-card、gallery-item 等）仍寫在各頁面的 <style>。
   ========================================================================== */

:root {
    --bg-color: #050b14;
    --text-color: #e0e6ed;
    --primary-color: #00e5ff;
    --secondary-color: #4da6ff;
    --accent-color: #7b2cbf;
    --card-bg: rgba(16, 32, 56, 0.6);
    --glass-bg: rgba(5, 11, 20, 0.85);
    --glass-border: rgba(255, 255, 255, 0.08);
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Accessibility: skip-to-content link，僅在鍵盤聚焦時可見 */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-color);
    color: var(--bg-color);
    padding: 12px 20px;
    font-weight: 700;
    text-decoration: none;
    z-index: 2000;
    border-radius: 0 0 8px 0;
    transition: top var(--transition-speed);
}

.skip-link:focus {
    top: 0;
    outline: 2px solid #fff;
    outline-offset: 2px;
}

/* Image protection — 行動裝置不可加入 pointer-events: none，會讓圖片無法顯示 */
img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

h1,
h2,
h3,
h4 {
    color: #ffffff;
    font-weight: 700;
}

.gradient-text {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header (Glassmorphism) */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1.2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: all var(--transition-speed) ease;
}

header h1 {
    font-size: 1.5rem;
    letter-spacing: 2px;
    font-weight: 900;
    margin: 0;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 30px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: color var(--transition-speed);
    position: relative;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-speed);
}

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

nav a:hover::after {
    width: 100%;
}

/* Section base */
section {
    padding: 100px 5%;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* Footer */
footer {
    background: #03060a;
    padding: 30px 5%;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

footer p {
    color: #6c8299;
    font-size: 0.9rem;
}

/* Shared responsive header */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        padding: 15px;
        gap: 15px;
    }
}