:root {
    /* 核心主题色 - 您只需修改这里 */
    --primary-h: 250; /* 色相范围通常是 0-360 */
    --primary-s: 83%;
    --primary-l: 53%;
    
    /* 自动生成的变量 */
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-soft: hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.1);
    --primary-border: hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.2);
    --primary-rgb: 37, 99, 235; /* 用于旧版兼容或特定场景 */

    --text: rgba(15, 23, 42, 0.9);
    --text-light: rgba(100, 116, 139, 0.8);
    --bg: #ffffff;
    --radius: 16px;
    --max-w: 1100px;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    color: var(--text);
    /* 全局背景从上到下渐变：主题色淡色 -> 白色 */
    background: linear-gradient(180deg, 
        hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.12) 0%, 
        hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.05) 15%, 
        rgba(255, 255, 255, 1) 40%
    );
    background-attachment: fixed;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* Header */
header {
    position: sticky; top: 0; z-index: 100;
    /* 加深页眉背景色，以衬托白色 Logo */
    background: hsla(var(--primary-h), var(--primary-s), 30%, 0.5);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.3);
}

.header-content { height: 72px; display: flex; align-items: center; justify-content: space-between; }

.logo { height: 40px; width: auto; display: block; }

.nav-btn {
    padding: 0.6rem 1.25rem;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: 0.3s;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.4);
}

/* Hero */
.hero { padding: 8rem 0; background: radial-gradient(circle at top right, rgba(var(--primary-rgb), 0.05), transparent); }

.hero-content { display: flex; align-items: center; gap: 4rem; }

.hero-title { font-size: 3.5rem; line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -0.02em; }

.hero-desc { font-size: 1.25rem; color: var(--text-light); margin-bottom: 2.5rem; max-width: 500px; }

.hero-img {
    width: 100%;
    max-width: 500px;
    height: 400px;
    object-fit: contain;
    filter: drop-shadow(0 20px 40px rgba(var(--primary-rgb), 0.15));
}

.btn-primary {
    display: inline-block; background: var(--primary); color: #fff;
    padding: 1rem 2.5rem; border-radius: 12px;
    font-size: 1.1rem; font-weight: 600; text-decoration: none;
    box-shadow: 0 10px 20px rgba(var(--primary-rgb), 0.2);
    transition: 0.2s;
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 15px 30px rgba(var(--primary-rgb), 0.3); }

/* Sections */
section { padding: 6rem 0; }

.section-title { 
    text-align: center; 
    font-size: 2.25rem; 
    margin-bottom: 4rem; 
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
}

/* Cards UI (Unified for highlights & comments) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px);
    padding: 2.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--primary-border);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 12px 24px hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.12);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.card-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-soft);
    color: var(--primary);
    border-radius: 10px; /* 改为圆角矩形更有现代感 */
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-icon svg { width: 20px; height: 20px; }

.card-title { font-weight: 600; font-size: 1.1rem; color: var(--text); }
.card-desc { color: var(--text-light); font-size: 1rem; line-height: 1.7; }

/* Section Specific Overrides */
.highlights { padding: 6rem 0; }
.comments { padding: 6rem 0; }

/* Gallery Section */
.gallery { padding: 6rem 0; }

.gallery-wrapper { display: flex; align-items: center; gap: 2rem; }

.gallery-viewport { flex: 1; overflow: hidden; border-radius: var(--radius); }

.gallery-track { display: flex; gap: 2rem; transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1); }

.gallery-item { flex: 0 0 calc(33.333% - 1.34rem); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--primary-border); }

.gallery-item img { width: 100%; height: auto; display: block; transition: transform 0.3s; }
.gallery-item:hover img { transform: scale(1.05); }

.gallery-btn {
    width: 48px; height: 48px; border-radius: 50%;
    border: 1px solid var(--primary-border);
    background: #fff; color: var(--primary);
    cursor: pointer; transition: 0.3s;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem;
}

.gallery-btn:hover:not(:disabled) { 
    background: var(--primary); 
    color: #fff; 
    border-color: var(--primary);
    box-shadow: 0 4px 12px hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.3);
}

.gallery-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* Footer */
footer { 
    padding: 4rem 0; 
    background: var(--primary-soft); 
    border-top: 1px solid var(--primary-border); 
    text-align: center; 
}

footer p { color: var(--text-light); font-size: 0.9rem; }

@media (max-width: 768px) {
    .hero-content { flex-direction: column; text-align: center; }
    .hero-title { font-size: 2.5rem; }
    .gallery-item { flex: 0 0 100%; }
    .gallery-wrapper { position: relative; }
    .gallery-btn { position: absolute; top: 50%; transform: translateY(-50%); z-index: 2; }
    .gallery-btn.prev { left: 0; }
    .gallery-btn.next { right: 0; }
}