/* ========================================
   基础变量与重置（深蓝 · 白 交替主题）
   ======================================== */
:root {
    /* 深蓝品牌色（OKLCH） */
    --navy-950: oklch(21% 0.05 255);   /* 深蓝区块底色 */
    --navy-900: oklch(26% 0.06 255);   /* 卡片面 */
    --navy-850: oklch(30% 0.07 255);
    --navy-800: oklch(35% 0.085 255);
    --blue-600: oklch(50% 0.17 255);   /* 主蓝 */
    --blue-500: oklch(58% 0.19 255);
    --blue-400: oklch(67% 0.15 255);   /* 亮蓝 */
    --blue-300: oklch(77% 0.10 255);

    /* 浅色中性色（带蓝调） */
    --paper: oklch(97.5% 0.006 250);
    --paper-2: oklch(94.5% 0.01 250);
    --ink: oklch(26% 0.035 255);       /* 白底深色文字 */
    --ink-2: oklch(44% 0.03 255);
    --ink-3: oklch(59% 0.02 255);
    --line: oklch(88% 0.02 250);
    --line-strong: oklch(79% 0.035 250);

    /* 语义变量（浅色区块默认值） */
    --bg-section: var(--paper);
    --surface: #ffffff;
    --surface-2: var(--paper-2);
    --text-h: var(--ink);
    --text-b: var(--ink-2);
    --text-m: var(--ink-3);
    --border: var(--line);
    --border-strong: var(--line-strong);
    --accent: var(--blue-600);
    --accent-strong: var(--blue-500);
    --accent-soft: var(--blue-400);
    --accent-tint: oklch(95% 0.03 250);   /* 蓝色浅底色 */

    /* 字体 */
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
    --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

    /* 布局 */
    --container-width: 1120px;
    --container-padding: 24px;

    /* 圆角与阴影 */
    --radius: 14px;
    --radius-sm: 9px;
    --shadow-card: 0 1px 2px rgba(15, 35, 70, 0.05), 0 12px 32px rgba(15, 35, 70, 0.08);
    --shadow-glow: 0 10px 34px rgba(38, 90, 205, 0.35);

    --transition: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    color: var(--text-b);
    background-color: var(--paper);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

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

/* ========================================
   顶部导航（深蓝）
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: transparent;
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: background var(--transition), border-color var(--transition);
}

.site-header.scrolled {
    background: rgba(13, 27, 51, 0.96);
    border-bottom-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 8px 24px rgba(6, 16, 34, 0.35);
}

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

.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-name {
    font-size: 1.22rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.06em;
}

.logo-tag {
    font-size: 0.68rem;
    color: var(--blue-300);
    letter-spacing: 0.12em;
    margin-top: 3px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.92rem;
    color: rgba(255, 255, 255, 0.82);
    position: relative;
    padding: 8px 0;
    transition: color var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--blue-400);
    border-radius: 2px;
    transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: #ffffff;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link-cta {
    color: var(--blue-300);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 22px;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.nav-link-cta::after {
    display: none;
}

.nav-link-cta:hover {
    background: var(--accent-strong);
    border-color: var(--blue-500);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    height: 2px;
    background: #ffffff;
    border-radius: 2px;
    transition: all var(--transition);
}

.menu-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ========================================
   首屏（深蓝）
   ======================================== */
.hero {
    padding: 165px 0 0;
    background:
        radial-gradient(900px 480px at 88% -8%, rgba(58, 120, 255, 0.28), transparent 65%),
        radial-gradient(700px 420px at -8% 22%, rgba(29, 79, 191, 0.35), transparent 65%),
        linear-gradient(180deg, var(--navy-950) 0%, var(--navy-900) 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.07);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    gap: 72px;
    align-items: center;
    position: relative;
    z-index: 1;
    padding-bottom: 84px;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--blue-300);
    letter-spacing: 0.12em;
    margin-bottom: 24px;
    font-weight: 500;
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 999px;
    background: rgba(58, 120, 255, 0.10);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.28;
    color: #ffffff;
    margin-bottom: 18px;
    letter-spacing: 0.01em;
}

.hero-subtitle {
    font-size: 1.22rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: 30px;
    line-height: 1.5;
}

.hero-intro {
    font-size: 0.97rem;
    color: rgba(255, 255, 255, 0.72);
    line-height: 1.9;
    margin-bottom: 16px;
    max-width: 560px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-top: 36px;
    flex-wrap: wrap;
}

/* 首屏数据条 */
.hero-stats-wrap {
    position: relative;
    z-index: 1;
    border-top: 1px solid rgba(255, 255, 255, 0.10);
    background: rgba(6, 16, 34, 0.25);
}

.hero-stats {
    display: flex;
    gap: 56px;
    padding: 30px 0;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-num {
    font-family: var(--font-serif);
    font-size: 2.1rem;
    font-weight: 700;
    color: #ffffff;
    line-height: 1;
    letter-spacing: 0.02em;
}

.stat-label {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 0.05em;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 30px;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-light {
    background: #ffffff;
    color: var(--navy-950);
    border-color: #ffffff;
    box-shadow: 0 4px 18px rgba(6, 16, 34, 0.25);
}

.btn-light:hover {
    background: var(--blue-100, #eaf1ff);
    transform: translateY(-1px);
}

.btn-outline-light {
    background: transparent;
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.35);
}

.btn-outline-light:hover {
    border-color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

/* 浅色区块按钮 */
.btn-solid {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-600));
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 18px rgba(38, 90, 205, 0.25);
}

.btn-solid:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-outline {
    background: transparent;
    color: var(--text-h);
    border-color: var(--border-strong);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* 头像占位 */
.hero-photo {
    display: flex;
    justify-content: center;
}

.photo-placeholder {
    background: rgba(13, 27, 51, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: var(--radius);
    overflow: hidden;
}

.photo-portrait {
    width: 100%;
    max-width: 350px;
    aspect-ratio: 4 / 5;
}

.photo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ========================================
   通用 Section（深浅交替）
   ======================================== */
.section {
    padding: 100px 0;
}

.section-light {
    background: var(--bg-section);
    color: var(--text-b);
}

.section-dark {
    background:
        radial-gradient(1100px 560px at 92% 0%, rgba(58, 120, 255, 0.16), transparent 60%),
        linear-gradient(180deg, var(--navy-950), var(--navy-900));
    color: rgba(255, 255, 255, 0.78);
}

/* 深蓝区块内语义覆盖 */
.section-dark {
    --surface: var(--navy-900);
    --surface-2: var(--navy-850);
    --text-h: #ffffff;
    --text-b: rgba(255, 255, 255, 0.78);
    --text-m: rgba(255, 255, 255, 0.52);
    --border: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.24);
    --accent: var(--blue-400);
    --accent-strong: var(--blue-300);
    --accent-soft: var(--blue-300);
    --accent-tint: rgba(58, 120, 255, 0.12);
}

.section-head {
    margin-bottom: 56px;
    max-width: 720px;
}

.section-head-center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-number {
    display: inline-block;
    font-size: 0.82rem;
    color: var(--accent);
    letter-spacing: 0.2em;
    margin-bottom: 12px;
    font-weight: 600;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.1rem;
    font-weight: 700;
    color: var(--text-h);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: 0.01em;
}

.section-desc {
    font-size: 1rem;
    color: var(--text-b);
    line-height: 1.8;
}

/* ========================================
   服务能力（白）
   ======================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 34px 30px;
    border-radius: var(--radius);
    transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-card);
}

.service-card:hover {
    border-color: var(--blue-400);
    transform: translateY(-3px);
    box-shadow: 0 16px 40px rgba(15, 35, 70, 0.12);
}

.card-icon {
    display: inline-flex;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--accent-tint);
    color: var(--accent);
    margin-bottom: 20px;
}

.card-icon svg {
    width: 22px;
    height: 22px;
}

.service-title {
    font-family: var(--font-serif);
    font-size: 1.22rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.service-text {
    font-size: 0.92rem;
    color: var(--text-b);
    line-height: 1.85;
    margin-bottom: 16px;
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.service-list li {
    font-size: 0.9rem;
    color: var(--text-b);
    padding-left: 18px;
    position: relative;
    line-height: 1.6;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 8px;
    height: 2px;
    background: var(--accent-strong);
    border-radius: 2px;
}

/* ========================================
   AI落地实践（深蓝）
   ======================================== */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 44px;
}

.platform-item {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 32px 30px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    transition: border-color var(--transition), transform var(--transition);
}

.platform-item:hover {
    border-color: rgba(122, 175, 255, 0.5);
    transform: translateY(-3px);
}

.platform-tag {
    display: inline-block;
    align-self: flex-start;
    font-size: 0.72rem;
    color: var(--blue-300);
    letter-spacing: 0.1em;
    padding: 5px 12px;
    border-radius: 999px;
    border: 1px solid rgba(122, 175, 255, 0.4);
    background: rgba(58, 120, 255, 0.12);
    margin-bottom: 18px;
    font-weight: 500;
}

.platform-title {
    font-family: var(--font-serif);
    font-size: 1.32rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 8px;
}

.platform-sub {
    font-size: 0.84rem;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 14px;
    letter-spacing: 0.03em;
}

.platform-text {
    font-size: 0.92rem;
    color: rgba(255, 255, 255, 0.74);
    line-height: 1.85;
    margin-bottom: 18px;
    flex: 1;
}

.platform-meta {
    font-size: 0.82rem;
    color: var(--blue-300);
    padding-top: 16px;
    border-top: 1px solid var(--border);
    line-height: 1.7;
}

.platform-screens {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.screen-placeholder {
    background: rgba(13, 27, 51, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: var(--radius);
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.screen-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ========================================
   从想法到产品：0到1（白）
   ======================================== */
.process-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.process-step {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 26px 22px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    transition: border-color var(--transition), transform var(--transition);
}

.process-step:hover {
    border-color: var(--blue-400);
    transform: translateY(-3px);
}

.process-index {
    display: inline-block;
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 14px;
    letter-spacing: 0.04em;
}

.process-title {
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 10px;
}

.process-text {
    font-size: 0.88rem;
    color: var(--text-b);
    line-height: 1.8;
}

.method-note {
    margin-top: 40px;
    padding: 26px 30px;
    background: var(--accent-tint);
    border-left: 3px solid var(--accent-strong);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.method-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 8px;
}

.method-text {
    font-size: 0.94rem;
    color: var(--text-b);
    line-height: 1.85;
}

/* ========================================
   代表项目（深蓝）
   ======================================== */
.project-list {
    display: flex;
    flex-direction: column;
}

.project-row {
    padding: 36px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.project-row:first-child {
    padding-top: 8px;
}

.project-row:last-child {
    border-bottom: none;
}

.project-head {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.project-index {
    flex-shrink: 0;
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.1;
}

.project-title {
    font-family: var(--font-serif);
    font-size: 1.18rem;
    font-weight: 600;
    color: var(--text-h);
    line-height: 1.4;
}

.project-meta {
    font-size: 0.84rem;
    color: var(--accent);
    margin-top: 4px;
    letter-spacing: 0.03em;
}

.project-text {
    font-size: 0.95rem;
    color: var(--text-b);
    line-height: 1.85;
    max-width: 860px;
}

.project-role {
    font-size: 0.85rem;
    color: var(--text-m);
    font-style: italic;
}

/* ========================================
   核心技能与资质（深蓝）
   ======================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.skill-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 30px 26px;
    border-radius: var(--radius);
    transition: border-color var(--transition);
}

.skill-card:hover {
    border-color: rgba(122, 175, 255, 0.5);
}

.skill-index {
    display: inline-block;
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--accent);
    padding: 5px 10px;
    border: 1px solid rgba(38, 90, 205, 0.28);
    border-radius: 8px;
    background: var(--accent-tint);
    margin-bottom: 16px;
}

.skill-title {
    font-family: var(--font-serif);
    font-size: 1.12rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 18px;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.skill-list li {
    font-size: 0.9rem;
    color: var(--text-b);
    padding-left: 18px;
    position: relative;
    line-height: 1.6;
}

.skill-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 8px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.certs {
    background: var(--accent-tint);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 32px;
}

.certs-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
}

.cert-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.cert-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.cert-badge {
    flex-shrink: 0;
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    padding: 4px 8px;
    border-radius: 6px;
    background: var(--accent-tint);
    margin-top: 2px;
}

.cert-item p {
    font-size: 0.92rem;
    color: var(--text-h);
    line-height: 1.6;
}

.cert-item p em {
    font-style: normal;
    font-size: 0.8rem;
    color: var(--text-m);
    display: block;
    margin-top: 4px;
}

/* ========================================
   工作经历（白）
   ======================================== */
.timeline {
    position: relative;
    margin-bottom: 64px;
}

.tl-item {
    position: relative;
    padding: 0 0 40px 40px;
    border-left: 1px solid var(--border);
}

.tl-item:last-child {
    padding-bottom: 0;
}

.tl-dot {
    position: absolute;
    left: -6px;
    top: 6px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--accent-strong);
    box-shadow: 0 0 0 4px rgba(38, 90, 205, 0.12);
}

.tl-head {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
}

.tl-company {
    font-family: var(--font-serif);
    font-size: 1.22rem;
    font-weight: 600;
    color: var(--text-h);
}

.tl-role {
    font-size: 0.9rem;
    color: var(--accent);
    font-weight: 500;
}

.tl-date {
    font-size: 0.82rem;
    color: var(--text-m);
    margin-left: auto;
    letter-spacing: 0.04em;
}

.tl-intro {
    font-size: 0.95rem;
    color: var(--text-b);
    line-height: 1.85;
    margin-bottom: 14px;
}

.tl-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tl-list li {
    font-size: 0.9rem;
    color: var(--text-b);
    padding-left: 18px;
    position: relative;
    line-height: 1.7;
}

.tl-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 8px;
    height: 2px;
    background: var(--accent-strong);
    border-radius: 2px;
}

/* 个人亮点 */
.highlights {
    padding-top: 48px;
    border-top: 1px solid var(--border);
}

.highlights-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 28px;
    letter-spacing: 0.05em;
}

.highlight-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.highlight-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 26px 24px;
    border-radius: var(--radius);
    transition: border-color var(--transition), transform var(--transition);
    box-shadow: var(--shadow-card);
}

.highlight-card:hover {
    border-color: var(--blue-400);
    transform: translateY(-3px);
}

.hl-index {
    display: block;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.14em;
    margin-bottom: 14px;
}

.hl-title {
    font-family: var(--font-serif);
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--text-h);
    margin-bottom: 10px;
}

.hl-text {
    font-size: 0.9rem;
    color: var(--text-b);
    line-height: 1.8;
}

/* ========================================
   合作方式 + CTA（深蓝）
   ======================================== */
.steps {
    display: flex;
    flex-direction: column;
    margin-bottom: 56px;
}

.step-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 40px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
    align-items: start;
}

.step-item:last-child {
    border-bottom: none;
}

.step-number {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    letter-spacing: 0.02em;
}

.step-title {
    font-family: var(--font-serif);
    font-size: 1.22rem;
    font-weight: 600;
    color: ##16243b;
    margin-bottom: 12px;
}

.step-text {
    font-size: 0.95rem;
    color: rgba(36, 34, 34, 0.72);
    line-height: 1.85;
    max-width: 720px;
}

.cta-block {
    text-align: center;
    padding: 48px 32px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
}

.cta-intro {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-h);
    line-height: 2;
    margin-bottom: 16px;
}

.cta-note {
    font-size: 0.92rem;
    color: var(--text-m);
    line-height: 1.85;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* ========================================
   联系方式（白）
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-name {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-h);
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.contact-role {
    font-size: 1rem;
    color: var(--text-b);
    margin-bottom: 40px;
}

.contact-list {
    margin-bottom: 32px;
}

.contact-row {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 24px;
    padding: 18px 0;
    border-bottom: 1px solid var(--border);
    align-items: center;
}

.contact-row:last-child {
    border-bottom: none;
}

.contact-row dt {
    font-size: 0.85rem;
    color: var(--text-m);
    letter-spacing: 0.08em;
}

.contact-row dd {
    font-size: 0.98rem;
    color: var(--text-h);
}

.contact-row dd a:hover {
    color: var(--accent);
}

.contact-tip {
    font-size: 0.88rem;
    color: var(--text-m);
    line-height: 1.7;
    padding: 20px 24px;
    background: var(--surface-2);
    border-left: 3px solid var(--accent-strong);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
}

.contact-qr {
    display: flex;
    justify-content: center;
}

.qr-placeholder {
    width: 240px;
    height: 240px;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.qr-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

/* ========================================
   页脚（深蓝）
   ======================================== */
.site-footer {
    background: var(--navy-950);
    color: rgba(255, 255, 255, 0.55);
    padding: 32px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-left {
    display: flex;
    align-items: baseline;
    gap: 16px;
}

.footer-name {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: #ffffff;
    font-weight: 600;
}

.footer-tag {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.45);
}

.footer-copy {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.45);
}

.footer-site {
    color: var(--blue-300);
}

.footer-site:hover {
    text-decoration: underline;
}

/* ========================================
   滚动出现动画
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 960px) {
    .hero {
        padding: 135px 0 0;
    }

    .hero-grid {
        grid-template-columns: 1fr;
        gap: 44px;
        padding-bottom: 64px;
    }

    .hero-title {
        font-size: 2.4rem;
    }

    .hero-subtitle {
        font-size: 1.12rem;
    }

    .hero-photo {
        order: -1;
    }

    .photo-portrait {
        max-width: 280px;
    }

    .hero-stats {
        gap: 36px;
    }

    .section {
        padding: 72px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .services-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .platform-grid {
        grid-template-columns: 1fr;
    }

    .platform-screens {
        grid-template-columns: 1fr;
    }

    .highlight-grid {
        grid-template-columns: 1fr;
    }

    .cert-list {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 720px) {
    :root {
        --container-padding: 20px;
    }

    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(13, 27, 51, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        gap: 0;
        padding: 16px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: transform var(--transition), opacity var(--transition);
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-link {
        padding: 14px 24px;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    }

    .nav-link::after {
        display: none;
    }

    .nav-link-cta {
        margin: 12px 24px 0;
        width: calc(100% - 48px);
        text-align: center;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 115px 0 0;
    }

    .hero-title {
        font-size: 1.9rem;
    }

    .hero-subtitle {
        font-size: 1.02rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 26px;
        padding: 24px 0;
    }

    .stat {
        min-width: 42%;
    }

    .stat-num {
        font-size: 1.6rem;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .section-head {
        margin-bottom: 40px;
    }

    .service-card,
    .skill-card,
    .platform-item,
    .highlight-card {
        padding: 26px 22px;
    }

    .step-item {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 26px 0;
    }

    .step-number {
        font-size: 1.6rem;
    }

    .tl-item {
        padding-left: 24px;
    }

    .tl-date {
        margin-left: 0;
        width: 100%;
    }

    .cta-block {
        padding: 36px 20px;
    }

    .contact-row {
        grid-template-columns: 80px 1fr;
        gap: 16px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .cta-buttons .btn {
        width: 100%;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}