/* ===================================================================
   DeepCity 深度城市 · 绿色主题样式
   理念层品牌 · 主色：深林绿 + 生机绿 + 克制金
   =================================================================== */

:root {
    --dc-deep:    #0E3B2E;   /* 深林绿 */
    --dc-deep-2:  #0A2A20;   /* 更深 */
    --dc-vibrant: #3DDC84;   /* 生机绿 */
    --dc-gold:    #D4AF37;   /* 克制金 */
    --dc-text:    #EAF2EC;   /* 主文字 */
    --dc-text-dim:#9AA6B8;   /* 弱化文字 */
    --dc-card:    rgba(255,255,255,0.04);
    --dc-border:  rgba(61,220,132,0.18);
    --dc-radius:  18px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--dc-deep-2);
    color: var(--dc-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

em { font-style: normal; color: var(--dc-vibrant); }

/* ============ 背景 ============ */
.dc-bg {
    position: fixed;
    inset: 0;
    z-index: -2;
    background:
        radial-gradient(ellipse 120% 80% at 50% -10%, rgba(61,220,132,0.12) 0%, transparent 55%),
        radial-gradient(ellipse 90% 60% at 100% 100%, rgba(212,175,55,0.06) 0%, transparent 50%),
        linear-gradient(180deg, #0A2A20 0%, #0E3B2E 100%);
}
.dc-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(61,220,132,0.10) 1px, transparent 1px);
    background-size: 38px 38px;
    opacity: 0.5;
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 0%, transparent 75%);
    mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 0%, transparent 75%);
}

.dc-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============ 导航 ============ */
.dc-nav {
    max-width: 1120px;
    margin: 0 auto;
    padding: 26px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.dc-nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    font-family: "Noto Serif SC", serif;
    font-weight: 700;
    color: var(--dc-text);
    font-size: 20px;
    letter-spacing: 0.5px;
}
.dc-nav-brand small {
    display: block;
    font-family: "Noto Sans SC", sans-serif;
    font-size: 10px;
    font-weight: 400;
    letter-spacing: 3px;
    color: var(--dc-vibrant);
    margin-top: -2px;
}
.dc-mark {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--dc-vibrant), #1E9E5A);
    color: #06140E;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 22px;
    font-family: "Noto Serif SC", serif;
    box-shadow: 0 4px 16px rgba(61,220,132,0.35);
}
.dc-nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}
.dc-nav-links a {
    color: var(--dc-text-dim);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.25s;
}
.dc-nav-links a:hover, .dc-nav-links a.active {
    color: var(--dc-vibrant);
}
.dc-nav-links a.cta {
    background: linear-gradient(135deg, var(--dc-vibrant), #1E9E5A);
    color: #06140E;
    padding: 9px 18px;
    border-radius: 999px;
    font-weight: 700;
}
.dc-nav-links a.cta:hover { opacity: 0.9; color: #06140E; }

/* ============ Hero ============ */
.dc-hero {
    text-align: center;
    padding: 60px 0 72px;
}
.dc-hero-badge {
    display: inline-block;
    border: 1px solid var(--dc-border);
    border-radius: 999px;
    padding: 7px 20px;
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--dc-vibrant);
    background: rgba(61,220,132,0.06);
    margin-bottom: 28px;
}
.dc-hero-title {
    font-family: "Noto Serif SC", serif;
    font-weight: 900;
    font-size: clamp(40px, 8vw, 68px);
    line-height: 1.08;
    letter-spacing: 2px;
    background: linear-gradient(180deg, #FFFFFF 0%, #BFE9CE 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.dc-hero-subtitle {
    font-size: clamp(18px, 3vw, 26px);
    color: var(--dc-vibrant);
    font-weight: 500;
    margin-top: 16px;
    letter-spacing: 4px;
}
.dc-hero-tagline {
    font-size: clamp(14px, 2.2vw, 18px);
    color: var(--dc-text-dim);
    margin-top: 22px;
    letter-spacing: 1px;
}
.dc-hero-slogan {
    font-size: clamp(13px, 2vw, 16px);
    color: var(--dc-vibrant);
    margin-top: 14px;
    letter-spacing: 1.5px;
    font-weight: 600;
    opacity: 0.85;
}
.dc-hero-img {
    margin: 40px auto 8px;
    border-radius: 24px;
    box-shadow: 0 24px 70px rgba(0,0,0,0.45);
}
.dc-hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 40px;
}

/* ============ 按钮 ============ */
.dc-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 30px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
    letter-spacing: 0.5px;
}
.dc-btn-primary {
    background: linear-gradient(135deg, var(--dc-vibrant), #1E9E5A);
    color: #06140E;
    box-shadow: 0 10px 30px rgba(61,220,132,0.30);
}
.dc-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px rgba(61,220,132,0.42); }
.dc-btn-ghost {
    border: 1px solid var(--dc-border);
    color: var(--dc-text);
    background: rgba(61,220,132,0.05);
}
.dc-btn-ghost:hover { border-color: var(--dc-vibrant); color: var(--dc-vibrant); }

/* ============ 区块通用 ============ */
.dc-section {
    padding: 72px 32px;
    border-top: 1px solid rgba(255,255,255,0.05);
    border-radius: var(--dc-radius);
    margin: 24px 0;
}
.dc-section-head {
    text-align: center;
    margin-bottom: 52px;
}
.dc-section-eyebrow {
    font-size: 12px;
    letter-spacing: 4px;
    color: var(--dc-gold);
    font-weight: 700;
}
.dc-section-title {
    font-family: "Noto Serif SC", serif;
    font-weight: 700;
    font-size: clamp(30px, 5vw, 46px);
    margin: 14px 0 18px;
    letter-spacing: 1px;
}
.dc-section-desc {
    max-width: 720px;
    margin: 0 auto;
    color: var(--dc-text-dim);
    font-size: 16px;
    line-height: 1.95;
}

/* ============ 五条理念 ============ */
.dc-principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 22px;
}
.dc-principle {
    background: var(--dc-card);
    border: 1px solid var(--dc-border);
    border-radius: var(--dc-radius);
    padding: 32px 28px;
    transition: transform 0.25s, border-color 0.25s;
}
.dc-principle:hover { transform: translateY(-5px); border-color: var(--dc-vibrant); }
.dc-principle-num {
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--dc-vibrant);
    font-weight: 700;
    margin-bottom: 14px;
}
.dc-principle h3 {
    font-size: 21px;
    font-family: "Noto Serif SC", serif;
    margin-bottom: 12px;
    color: #fff;
}
.dc-principle p {
    color: var(--dc-text-dim);
    font-size: 15px;
    line-height: 1.85;
}

/* ============ 深度三层 ============ */
.dc-depth {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
}
.dc-depth-card {
    background: linear-gradient(160deg, rgba(61,220,132,0.08), rgba(255,255,255,0.02));
    border: 1px solid var(--dc-border);
    border-radius: var(--dc-radius);
    padding: 34px 28px;
    text-align: center;
    transition: transform 0.25s;
}
.dc-depth-card:hover { transform: translateY(-5px); }
.dc-depth-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--dc-vibrant), #1E9E5A);
    color: #06140E;
    font-size: 26px;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Noto Serif SC", serif;
}
.dc-depth-card h3 {
    font-size: 22px;
    font-family: "Noto Serif SC", serif;
    margin-bottom: 12px;
    color: #fff;
}
.dc-depth-card p {
    color: var(--dc-text-dim);
    font-size: 15px;
    line-height: 1.85;
}
.dc-depth-vs {
    margin-top: 16px;
    font-size: 13px;
    color: var(--dc-gold);
    font-style: italic;
    padding-top: 14px;
    border-top: 1px dashed rgba(212,175,55,0.25);
}

/* ============ 分发网络 ============ */
.dc-network {
    background: var(--dc-card);
    border: 1px solid var(--dc-border);
    border-radius: var(--dc-radius);
    padding: 44px 32px;
}
.dc-network-grid {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 18px;
    flex-wrap: wrap;
}
.dc-network-node {
    flex: 1 1 240px;
    min-height: 130px;
    border: 1px solid var(--dc-border);
    border-radius: 14px;
    padding: 24px;
    background: rgba(255,255,255,0.03);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.dc-network-node h4 {
    font-size: 16px;
    margin-bottom: 10px;
    color: #fff;
    letter-spacing: 1px;
}
.dc-network-node p {
    font-size: 14px;
    color: var(--dc-text-dim);
    line-height: 1.7;
}
.dc-network-node.terminal h4 { color: var(--dc-vibrant); }
.dc-network-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: var(--dc-gold);
    font-weight: 700;
    padding: 8px 0;
}
.dc-network-stack {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ============ 道与术 ============ */
.dc-tao-shu {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.dc-tao, .dc-shu {
    border-radius: var(--dc-radius);
    padding: 36px 32px;
}
.dc-tao {
    background: linear-gradient(160deg, rgba(61,220,132,0.10), rgba(255,255,255,0.02));
    border: 1px solid var(--dc-border);
}
.dc-shu {
    background: linear-gradient(160deg, rgba(212,175,55,0.08), rgba(255,255,255,0.02));
    border: 1px solid rgba(212,175,55,0.22);
}
.dc-tao-label, .dc-shu-label {
    display: inline-block;
    font-size: 12px;
    letter-spacing: 2px;
    font-weight: 700;
    margin-bottom: 14px;
}
.dc-tao-label { color: var(--dc-vibrant); }
.dc-shu-label { color: var(--dc-gold); }
.dc-tao h3, .dc-shu h3 {
    font-family: "Noto Serif SC", serif;
    font-size: 26px;
    margin-bottom: 22px;
    color: #fff;
}
.dc-tao p, .dc-shu p {
    font-size: 14.5px;
    color: var(--dc-text-dim);
    margin-bottom: 9px;
    line-height: 1.7;
}

/* ============ 时间线 ============ */
.dc-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}
.dc-timeline-item {
    background: var(--dc-card);
    border: 1px solid var(--dc-border);
    border-radius: var(--dc-radius);
    padding: 32px 28px;
    position: relative;
    transition: transform 0.25s, border-color 0.25s;
}
.dc-timeline-item:hover { transform: translateY(-5px); border-color: var(--dc-vibrant); }
.dc-timeline-dot {
    font-size: 30px;
    margin-bottom: 14px;
}
.dc-timeline-stage {
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--dc-gold);
    font-weight: 700;
    margin-bottom: 8px;
}
.dc-timeline-item h3 {
    font-size: 21px;
    font-family: "Noto Serif SC", serif;
    margin-bottom: 10px;
    color: #fff;
}
.dc-timeline-item p {
    color: var(--dc-text-dim);
    font-size: 14.5px;
    line-height: 1.8;
}

/* ============ 价值强调（合作模式） ============ */
.dc-value-emph {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 22px;
}
.dc-value-item {
    background: var(--dc-card);
    border: 1px solid var(--dc-border);
    border-radius: var(--dc-radius);
    padding: 32px 26px;
    text-align: center;
}
.dc-value-mark {
    font-size: 34px;
    margin-bottom: 14px;
}
.dc-value-item h3 {
    font-size: 20px;
    font-family: "Noto Serif SC", serif;
    margin-bottom: 10px;
    color: #fff;
}
.dc-value-item p {
    color: var(--dc-text-dim);
    font-size: 14.5px;
    line-height: 1.8;
}

/* ============ 案例 ============ */
.dc-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 22px;
}
.dc-case {
    background: var(--dc-card);
    border: 1px solid var(--dc-border);
    border-radius: var(--dc-radius);
    padding: 28px 24px;
    transition: transform 0.25s, border-color 0.25s;
}
.dc-case:hover { transform: translateY(-5px); border-color: var(--dc-vibrant); }
.dc-case-cat {
    display: inline-block;
    font-size: 12px;
    color: #06140E;
    background: var(--dc-vibrant);
    padding: 4px 12px;
    border-radius: 999px;
    font-weight: 700;
    margin-bottom: 14px;
}
.dc-case h3 {
    font-size: 19px;
    font-family: "Noto Serif SC", serif;
    margin-bottom: 10px;
    color: #fff;
}
.dc-case p {
    color: var(--dc-text-dim);
    font-size: 14px;
    line-height: 1.78;
}

/* ============ 适配度列表 ============ */
.dc-fit {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
}
.dc-fit-item {
    background: var(--dc-card);
    border: 1px solid var(--dc-border);
    border-radius: 14px;
    padding: 20px 24px;
    font-size: 15.5px;
    color: var(--dc-text);
    line-height: 1.7;
}
.dc-fit-item:hover { border-color: var(--dc-vibrant); }

/* ============ Footer ============ */
.dc-footer {
    text-align: center;
    padding: 64px 24px 80px;
    border-top: 1px solid rgba(255,255,255,0.06);
    margin-top: 40px;
}
.dc-footer-brand {
    font-family: "Noto Serif SC", serif;
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 3px;
    margin-bottom: 14px;
}
.dc-footer p { color: var(--dc-text-dim); font-size: 14px; line-height: 1.9; }
.dc-footer a { color: var(--dc-vibrant); text-decoration: none; }
.dc-footer a:hover { color: var(--dc-gold); }

/* ============ 响应式 ============ */
@media (max-width: 760px) {
    .dc-nav { flex-direction: column; gap: 16px; padding: 20px; }
    .dc-nav-links { gap: 16px; flex-wrap: wrap; justify-content: center; }
    .dc-tao-shu { grid-template-columns: 1fr; }
    .dc-network-grid { flex-direction: column; }
    .dc-network-arrow { transform: none; }
    .dc-section { padding: 52px 18px; }
    .dc-hero { padding: 30px 0 48px; }
}

/* ============ 置顶横幅 ============ */
.dc-banner {
    background: var(--dc-vibrant);
    color: #0A2A20;
    text-align: center;
    padding: 10px 20px;
    font-size: 14px;
    line-height: 1.5;
}
.dc-banner a {
    color: #0A2A20;
    text-decoration: underline;
}
.dc-banner a:hover {
    opacity: 0.8;
}