:root {
    --color-primary: #0f766e;
    --color-primary-dark: #0b3b38;
    --color-accent: #f59e0b;
    --color-surface: #faf5eb;
    --color-text: #14211e;
    --rgb-primary: 15,118,110;
    --rgb-accent: 245,158,11;
    --radius-sm: 2px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --shadow-sm: 0 1px 2px rgba(15,118,110,.06), 0 2px 6px rgba(15,118,110,.04);
    --shadow-md: 0 2px 4px rgba(15,118,110,.06), 0 12px 24px -8px rgba(15,118,110,.14), 0 0 0 1px rgba(245,158,11,.06);
    --shadow-lg: 0 4px 8px rgba(15,118,110,.08), 0 24px 48px -12px rgba(15,118,110,.22), 0 0 0 1px rgba(245,158,11,.12), 0 32px 64px -16px rgba(11,59,56,.18);
    --space-section: 5.5rem;
    --space-card: 1.75rem;
    --space-gap: 1.75rem;
    --transition: all .55s cubic-bezier(.22, 1, .36, 1);
    --heading-weight: 600;
    --body-line-height: 1.75;
    accent-color: var(--color-accent);
    caret-color: var(--color-primary);
}

/* 基础覆盖 */
body {
    color: var(--color-text);
    line-height: var(--body-line-height);
    background-color: var(--color-surface);
    background-image: repeating-linear-gradient(180deg,
        #ffffff 0,
        #ffffff 160px,
        rgba(250,245,235,.9) 160px,
        rgba(250,245,235,.9) 300px,
        rgba(11,59,56,.08) 300px,
        rgba(11,59,56,.08) 308px,
        rgba(231,239,236,.8) 308px,
        rgba(231,239,236,.8) 480px,
        #ffffff 480px,
        #ffffff 640px);
}

h1, h2, h3, h4 {
    font-weight: var(--heading-weight);
    text-shadow: 0 1px 2px rgba(255,255,255,.8);
}

section, .section {
    padding-top: var(--space-section);
    padding-bottom: var(--space-section);
    background:
        linear-gradient(to bottom, var(--color-accent) 0, var(--color-accent) 3px, transparent 3px) top left / 100% 100% no-repeat,
        linear-gradient(to top, var(--color-primary) 0, var(--color-primary) 3px, transparent 3px) bottom left / 100% 100% no-repeat,
        linear-gradient(135deg, rgba(15,118,110,.05), rgba(245,158,11,.06)) center / 100% 100% no-repeat;
}

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-card);
    transition: var(--transition);
    background:
        linear-gradient(145deg, rgba(255,255,255,.94), rgba(255,250,240,.88)) padding-box,
        linear-gradient(135deg, rgba(15,118,110,.45), rgba(245,158,11,.5), rgba(15,118,110,.35)) border-box;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: var(--transition);
    background-image: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fffdf8;
    box-shadow: 0 10px 20px -8px rgba(15,118,110,.48), inset 0 1px 0 rgba(255,255,255,.22);
    text-shadow: 0 1px 2px rgba(11,59,56,.4);
}

a:not([class]) {
    color: var(--color-primary);
    transition: var(--transition);
    text-decoration-color: rgba(15,118,110,.35);
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

/* ========== Section Layout Variants ========== */

/* news: masonry-2 */
/* 两列瀑布流 */
.news-grid {
    column-count: 2;
    column-gap: var(--space-gap);
    background: linear-gradient(120deg, rgba(255,255,255,.6), rgba(250,245,235,.4));
    border-radius: var(--radius-lg);
}

.news-grid .card {
    break-inside: avoid;
    margin-bottom: var(--space-gap);
}

/* features: centered */
/* 居中大卡片 */
.feature-list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--space-gap) * 2);
    max-width: 720px;
    margin: 0 auto;
    background: linear-gradient(180deg, rgba(255,255,255,.35), rgba(15,118,110,.04));
    border-radius: var(--radius-xl);
}

/* hero: split */
/* 左文右图 */
.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
    background: radial-gradient(circle at 0% 50%, rgba(15,118,110,.12), transparent 55%), linear-gradient(135deg, rgba(255,255,255,.55), rgba(250,245,235,.35));
    border-radius: var(--radius-xl);
}

/* testimonials: carousel */
/* 单条轮播 */
.testimonial-list {
    display: flex;
    overflow: hidden;
    background: linear-gradient(90deg, rgba(255,255,255,.7), rgba(245,158,11,.08));
    border-radius: var(--radius-xl);
}

/* partners: grid-4 */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: calc(var(--space-gap) * 1.5);
    align-items: center;
    background: linear-gradient(145deg, rgba(255,255,255,.7), rgba(231,239,236,.4));
    border-radius: var(--radius-lg);
}

/* faq: two-column */
.faq-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-gap);
    background: linear-gradient(180deg, rgba(255,255,255,.45), rgba(255,255,255,.1));
    border-radius: var(--radius-lg);
}

/* stats: grid-4 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-gap);
    text-align: center;
    background: linear-gradient(135deg, rgba(15,118,110,.08), rgba(245,158,11,.1));
    border-radius: var(--radius-xl);
}

/* cta: centered */
.cta-inner {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    background: radial-gradient(circle at 50% 0%, rgba(245,158,11,.12), rgba(15,118,110,.06) 70%);
    border-radius: var(--radius-xl);
}

/* Page Layout: wide */
/* 超宽 */
.page-main {
    max-width: 1400px;
    margin: 0 auto;
    background: linear-gradient(180deg, rgba(255,255,255,0), rgba(250,245,235,.35));
    border-radius: var(--radius-xl);
}

/* 条件性装饰 */
a:not([class]):hover {
    color: var(--color-accent);
    text-shadow: 0 2px 8px rgba(245,158,11,.35);
}

.card {
    border: 1px solid transparent;
    box-shadow: var(--shadow-lg);
}

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; }
}

@media (max-width: 640px) {
    :root {
        --space-section: 2.25rem;
        --space-card: 1rem;
        --space-gap: .875rem;
    }
    .news-grid { grid-template-columns: 1fr !important; }
    .feature-list { grid-template-columns: 1fr !important; }
    .faq-list { grid-template-columns: 1fr !important; }
    .testimonial-list { column-count: 1 !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .cta-inner { grid-template-columns: 1fr !important; }
}