/* ========================================
   Wenjie Luo — 纸色工作台风
   Palette / tiles / chat craft after Civil-LLM,
   numbers stay checkable (no fake 4318 / 96.4%).
   ======================================== */

:root {
    color-scheme: light;
    --color-bg: #f9f9f7;
    --color-bg-alt: #f3f2ee;
    --color-surface: #fcfcfb;
    --color-text: #0b0b0b;
    --color-text-muted: #52514e;
    --color-text-light: #898781;
    --color-accent: #2a78d6;
    --color-accent-light: #3987e5;
    --color-accent-subtle: rgba(42, 120, 214, 0.10);
    --color-border: #e1e0d9;
    --color-ring: rgba(11, 11, 11, 0.10);
    --color-tag-bg: #f0efea;
    --color-tag-text: #52514e;
    --color-success: #0ca30c;
    --color-warning: #eda100;
    --s1: #2a78d6;
    --s2: #eb6834;
    --s3: #1baf7a;
    --s4: #eda100;
    --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Inter, sans-serif;
    --font-mono: ui-monospace, "JetBrains Mono", "SF Mono", "Fira Code", Consolas, monospace;
    --max-width: 960px;
    --hero-width: 1120px;
    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(11, 11, 11, 0.04);
    --shadow: 0 1px 2px rgba(11, 11, 11, 0.04), 0 4px 16px rgba(11, 11, 11, 0.05);
    --shadow-md: 0 2px 4px rgba(11, 11, 11, 0.06), 0 8px 24px rgba(11, 11, 11, 0.08);
    --transition: 0.15s ease;
}

/* ---- 全局重置 ---- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    min-height: 100vh;
}

/* ---- 排版 ---- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover {
    color: var(--color-accent);
}

p {
    margin-bottom: 1rem;
}
p:last-child { margin-bottom: 0; }

::selection {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

/* ---- 跳过导航（无障碍） ---- */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    z-index: 1001;
    background: var(--color-accent);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: top 0.2s ease;
}
.skip-link:focus {
    top: 0.75rem;
}

/* ---- 导航栏 ---- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(249, 249, 247, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}
.navbar.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--hero-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo-mark {
    width: 14px;
    height: 14px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--s1), var(--s3));
    flex: none;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}
.nav-logo:hover {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}
.nav-links a {
    display: block;
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}
.nav-links a.active {
    font-weight: 600;
}
.nav-links a.nav-lang {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    border: 1px solid var(--color-border);
    margin-left: 0.25rem;
}
.nav-links a.nav-lang:hover {
    border-color: var(--color-accent);
}

/* 移动端汉堡菜单 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
    border-radius: 2px;
}
.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- Hero 头部：左身份 + 右工作台 ---- */
.hero {
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: left;
    padding: 6.25rem 1.5rem 2.75rem;
    position: relative;
    background: var(--color-bg);
}

.hero-container {
    max-width: var(--hero-width);
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
    align-items: center;
}

.hero-copy {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
}

.hero-kicker {
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin: 0;
}

.hero-id {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.hero-avatar {
    width: 72px;
    height: 72px;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--color-ring);
    box-shadow: var(--shadow);
    background: var(--color-accent-subtle);
    flex: none;
}
.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.avatar-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-accent);
    font-family: var(--font-sans);
}

.hero-name {
    font-size: 2.35rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    color: var(--color-text);
    line-height: 1.1;
}
.hero-name-en {
    display: block;
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-light);
    letter-spacing: 0.02em;
    margin-top: 0.2rem;
}

.hero-tagline {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 34rem;
    line-height: 1.7;
    margin: 0;
}

.hero-cta {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.15rem;
    flex-wrap: wrap;
    justify-content: flex-start;
}
.hero-cta-note {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.35rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    border: 1px solid transparent;
    cursor: pointer;
    font-family: var(--font-sans);
    text-decoration: none;
}
.btn-sm {
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
}
.btn-primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}
.btn-primary:hover {
    filter: brightness(1.08);
    color: #fff;
}
.btn-outline {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}
.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}

.hero-social {
    display: flex;
    gap: 0.6rem;
    margin-top: 0.15rem;
}
.hero-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.hero-social a:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

/* 工作台预览（右栏） */
.hero-console {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: 14px;
    box-shadow: var(--shadow);
    overflow: hidden;
    animation: fadeUp 0.35s ease both;
}
.console-banner {
    background: var(--color-accent-subtle);
    color: var(--color-text-muted);
    font-size: 12px;
    padding: 8px 16px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.mode-pill {
    font-size: 11px;
    padding: 1px 10px;
    border-radius: 99px;
    border: 1px solid var(--color-success);
    color: var(--color-success);
    white-space: nowrap;
    font-weight: 600;
}
.tiles {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    padding: 14px 14px 0;
}
.tile {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: 12px;
    padding: 12px 14px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.18s, transform 0.18s;
}
.tile:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.tile .lbl {
    font-size: 11.5px;
    color: var(--color-text-light);
}
.tile .val {
    font-size: 24px;
    font-weight: 700;
    margin-top: 2px;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
    line-height: 1.15;
    color: var(--color-text);
}
.tile .val-split {
    font-size: 0.62em;
    font-weight: 600;
    color: var(--color-text-light);
    margin-left: 1px;
}
.tile .sub {
    font-size: 11px;
    color: var(--color-text-muted);
    margin-top: 2px;
    line-height: 1.4;
}
.console-chat {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px 16px 16px;
}
.msg {
    max-width: 92%;
    line-height: 1.65;
    font-size: 13.5px;
    animation: fadeUp 0.28s ease both;
}
.msg.user {
    align-self: flex-end;
    background: var(--color-accent);
    color: #fff;
    padding: 9px 14px;
    border-radius: 14px 14px 3px 14px;
}
.msg.bot {
    align-self: flex-start;
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    padding: 12px 14px;
    border-radius: 14px 14px 14px 3px;
    width: 92%;
    animation-delay: 0.12s;
}
.msg.bot p {
    margin: 0;
    color: var(--color-text);
    font-size: 13.5px;
    line-height: 1.65;
}
.bot-head {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 11.5px;
    color: var(--color-text-light);
    margin-bottom: 8px;
}
.bot-head .dot {
    width: 8px;
    height: 8px;
    border-radius: 3px;
    background: linear-gradient(135deg, var(--s1), var(--s3));
    flex: none;
}
.route-badges {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}
.route-badges span {
    font-size: 11px;
    padding: 2.5px 9px;
    border-radius: 99px;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
}
.cites {
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.cite {
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: 6px;
    padding: 7px 10px;
    font-size: 12px;
    color: inherit;
    display: block;
    text-decoration: none;
    transition: background var(--transition);
}
.cite:hover {
    background: var(--color-accent-subtle);
    color: inherit;
}
.cite .c-head {
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--color-text);
    flex-wrap: wrap;
}
.cite .code {
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 11.5px;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: none; }
}

/* ---- Section 通用 ---- */
.section {
    padding: 4rem 1.5rem;
}
.section-alt {
    background: var(--color-bg-alt);
}
.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-title {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
}
.section-title::before {
    content: '';
    width: 3px;
    height: 16px;
    border-radius: 2px;
    background: var(--color-accent);
    flex: none;
}
.section-title::after {
    display: none;
}

/* ---- About ---- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.about-text p {
    font-size: 1.025rem;
    color: var(--color-text);
    line-height: 1.85;
}

.about-quick-facts {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}
.fact {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.85rem;
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: 99px;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    box-shadow: var(--shadow-sm);
}
.fact-icon {
    font-size: 0.9rem;
}

/* ---- 时间线 (Education & Experience) ---- */
.timeline {
    position: relative;
    padding-left: 2rem;
    border-left: 2px solid var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
    padding-left: 2rem;
}
.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -2.55rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-accent);
}
.section-alt .timeline-dot {
    border-color: var(--color-bg-alt);
}

.timeline-content {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.18s, transform 0.18s;
}
.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}
.timeline-date {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent-light);
    font-family: var(--font-mono);
}
.timeline-badge {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15rem 0.55rem;
    border-radius: 12px;
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}
.badge-pm { background: var(--color-accent-subtle); color: var(--color-accent); }
.badge-supply { background: rgba(237, 161, 0, 0.14); color: #9a6a00; }
.badge-eng { background: rgba(27, 175, 122, 0.12); color: #0f7a54; }
.badge-live { background: rgba(237, 161, 0, 0.18); color: #9a6a00; }

.timeline-featured {
    border-left: 4px solid var(--color-accent);
}
.exp-summary {
    font-size: 0.92rem;
    color: var(--color-text-muted);
    line-height: 1.65;
    margin: 0.5rem 0 0.85rem;
}
.exp-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.9rem;
}
.exp-tags span {
    font-size: 0.72rem;
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-family: var(--font-mono);
}

/* ---- 实习整合块（方法 + 交付） ---- */
.exp-integrated {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.35rem 1.25rem;
    margin-bottom: 2.5rem;
    border-left: 4px solid var(--color-accent);
    box-shadow: var(--shadow);
}
.exp-integrated-header h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0.35rem 0 0.15rem;
}
.exp-layer {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--color-border);
}
.exp-layer-title {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0 0 0.35rem;
    color: var(--color-text);
}
.exp-layer-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.6rem;
    height: 1.6rem;
    padding: 0 0.35rem;
    border-radius: 6px;
    font-size: 0.72rem;
    font-family: var(--font-mono);
    font-weight: 700;
    background: var(--color-accent);
    color: #fff;
}
.exp-layer-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0 0 0.9rem;
    line-height: 1.55;
}
.pillar-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.85rem;
}
.pillar-card {
    background: var(--color-bg);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.18s, transform 0.18s;
}
.pillar-card:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.pillar-card:target {
    outline: 2px solid var(--color-accent-light);
    outline-offset: 2px;
}
.pillar-top {
    display: flex;
    gap: 0.65rem;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}
.pillar-top h5 {
    font-size: 0.98rem;
    font-weight: 600;
    margin: 0.25rem 0 0;
}
.pillar-card > p {
    font-size: 0.86rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    margin: 0 0 0.5rem;
}
.deliver-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}
.deliver-card {
    background: var(--color-bg);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 0.95rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.18s, transform 0.18s;
}
.deliver-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.deliver-card h5 {
    font-size: 0.92rem;
    font-weight: 600;
    margin: 0;
}
.deliver-card p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0;
    flex: 1;
}
.deliver-via {
    font-size: 0.7rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--color-accent);
    letter-spacing: 0.02em;
}
.exp-subheading {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 1.25rem;
    color: var(--color-text-muted);
    letter-spacing: -0.01em;
}
.timeline-compact {
    margin-top: 0;
}
.timeline-compact .timeline-content {
    padding: 1.15rem 1.25rem;
}
.timeline-compact .exp-list {
    margin-top: 0.4rem;
}
.workstream-icon {
    font-size: 1.5rem;
    line-height: 1;
    flex-shrink: 0;
}
.workstream-tag {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.12rem 0.5rem;
    border-radius: 999px;
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}
.workstream-points {
    list-style: none;
    margin: 0.2rem 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.22rem;
}
.workstream-points li {
    font-size: 0.8rem;
    color: var(--color-text);
    padding-left: 0.9rem;
    position: relative;
    line-height: 1.45;
}
.workstream-points li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.45em;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-accent-light);
    opacity: 0.75;
}
.workstream-footnote {
    text-align: left;
    font-size: 0.78rem;
    color: var(--color-text-light);
    margin: 1.25rem 0 0;
}
@media (min-width: 640px) {
    .pillar-grid { grid-template-columns: repeat(2, 1fr); }
    .deliver-grid { grid-template-columns: repeat(2, 1fr); }
    .exp-integrated { padding: 1.75rem 1.6rem 1.4rem; }
}
[data-theme="dark"] .exp-integrated,
[data-theme="dark"] .pillar-card,
[data-theme="dark"] .deliver-card {
    background: var(--color-surface);
    border-color: var(--color-border);
}
[data-theme="dark"] .pillar-card,
[data-theme="dark"] .deliver-card {
    background: var(--color-bg-alt);
}

.timeline-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.text-muted {
    color: var(--color-text-muted);
    font-weight: 400;
}
.timeline-degree {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 0.2rem;
}
.timeline-meta {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.75rem;
}

.timeline-courses {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.75rem;
}
.course-tag {
    font-size: 0.78rem;
    padding: 0.2rem 0.6rem;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    border-radius: 4px;
    font-weight: 500;
    white-space: nowrap;
}

/* 经历列表 */
.exp-list {
    list-style: none;
    padding: 0;
}
.exp-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.45rem;
    font-size: 0.925rem;
    color: var(--color-text);
    line-height: 1.55;
}
.exp-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent-light);
    opacity: 0.6;
}

/* ---- 项目卡片 ---- */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.project-card {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.18s, transform 0.18s;
}
.project-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.project-featured {
    border-left: 4px solid var(--color-accent);
}
.project-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--color-border);
}
.project-meta-note {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}
.project-card:target {
    outline: 2px solid var(--color-accent-light);
    outline-offset: 3px;
}

/* ---- 关键数字条 ---- */
.metrics-section {
    padding: 0 1.5rem 2rem;
    margin-top: -1rem;
}
.metrics-grid {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1rem;
    box-shadow: var(--shadow);
}
.metric-item {
    text-align: center;
    padding: 0.5rem;
}
.metric-value {
    display: block;
    font-size: 1.65rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-accent);
    letter-spacing: -0.02em;
    line-height: 1.2;
}
.metric-label {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.section-lead {
    text-align: left;
    color: var(--color-text-muted);
    font-size: 0.92rem;
    margin: -1.15rem 0 1.5rem;
    max-width: 40rem;
}

.run-box {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.95rem 1.1rem;
    overflow-x: auto;
    line-height: 1.55;
    color: var(--color-text);
    max-width: 40rem;
    margin: 1.25rem auto 0;
}
#product .deliver-grid {
    margin-top: 0.5rem;
}
#product code {
    font-family: var(--font-mono);
    font-size: 0.86em;
}

/* Insights 可点击卡片 */
a.insight-card {
    display: block;
    color: inherit;
    text-decoration: none;
    cursor: pointer;
}
a.insight-card:hover {
    color: inherit;
    border-color: var(--color-accent-light);
    box-shadow: var(--shadow-md);
}
.insight-link {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent-light);
}
.status-meta {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.project-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}
.project-year {
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--color-accent-light);
}
.project-type {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    padding: 0.15rem 0.5rem;
    background: var(--color-bg-alt);
    border-radius: 4px;
}

.project-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    line-height: 1.4;
}
.project-affil {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.85rem;
}
.project-tech span {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    border-radius: 4px;
    font-family: var(--font-mono);
}

.project-details {
    list-style: none;
    padding: 0;
}
.project-details li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.35rem;
    font-size: 0.875rem;
    color: var(--color-text);
    line-height: 1.55;
}
.project-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-text-light);
    font-size: 0.75rem;
    top: 0.1rem;
}

.project-highlight {
    margin-top: 0.85rem;
    padding: 0.65rem 0.9rem;
    background: rgba(237, 161, 0, 0.12);
    border-radius: var(--radius);
    font-size: 0.84rem;
    color: #713f12;
    display: flex;
    gap: 0.5rem;
    align-items: flex-start;
}
.highlight-label {
    font-weight: 600;
    white-space: nowrap;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ---- 技能 ---- */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.skill-category {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.35rem;
    box-shadow: var(--shadow);
}
.skill-category h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.85rem;
    color: var(--color-text);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.skill-tag {
    font-size: 0.82rem;
    padding: 0.3rem 0.7rem;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    border-radius: 6px;
    font-weight: 500;
    transition: all var(--transition);
}
.skill-tag:hover {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

/* ---- 校园经历 ---- */
.campus-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

.campus-card {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.18s, transform 0.18s;
}
.campus-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.campus-icon {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}
.campus-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.campus-date {
    font-size: 0.8rem;
    color: var(--color-text-light);
    font-family: var(--font-mono);
    display: block;
    margin-bottom: 0.65rem;
}
.campus-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ---- Blog 文章 ---- */
.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.blog-card {
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.35rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.18s, transform 0.18s;
}
.blog-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.insights-grid .insight-card:nth-child(1) { border-top: 3px solid var(--s1); }
.insights-grid .insight-card:nth-child(2) { border-top: 3px solid var(--s2); }
.insights-grid .insight-card:nth-child(3) { border-top: 3px solid var(--s3); }
.insights-grid .insight-card:nth-child(4) { border-top: 3px solid var(--s4); }

.blog-card-date {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-accent-light);
    font-family: var(--font-mono);
    margin-bottom: 0.5rem;
}
.blog-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}
.blog-card p {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 0.75rem;
}
.blog-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}
.blog-card-tags span {
    font-size: 0.73rem;
    padding: 0.15rem 0.5rem;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    border-radius: 4px;
}

.blog-more {
    text-align: center;
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* ---- 联系 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.contact-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
}
.contact-item strong {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-light);
    margin-bottom: 0.15rem;
}
.contact-item span, .contact-item a {
    font-size: 0.925rem;
    color: var(--color-text);
}

.status-card {
    background: var(--color-accent-subtle);
    border: 1px solid var(--color-ring);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    box-shadow: var(--shadow);
}
.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-success);
    flex-shrink: 0;
    margin-top: 0.3rem;
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.status-card p {
    font-size: 0.9rem;
    color: var(--color-text);
    line-height: 1.7;
}

/* ---- 页脚 ---- */
.footer {
    text-align: center;
    padding: 2.5rem 1.5rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.85rem;
}
.footer-sub {
    font-size: 0.78rem;
    color: var(--color-text-light);
    margin-top: 0.3rem;
}

/* ---- 返回顶部按钮 ---- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-accent);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(16px);
    pointer-events: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}
.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.back-to-top:hover {
    filter: brightness(1.08);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ---- 动画 ---- */
.fade-in {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.35s ease, transform 0.35s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .fade-in,
    .hero-console,
    .msg {
        opacity: 1;
        transform: none;
        animation: none;
        transition: none;
    }
    .project-card:hover,
    .career-card:hover,
    .blog-card:hover,
    .tile:hover,
    .timeline-content:hover,
    .deliver-card:hover,
    .campus-card:hover {
        transform: none;
    }
}

/* ---- 响应式 ---- */
@media (min-width: 640px) {
    .hero-name { font-size: 2.75rem; }
    .tiles { grid-template-columns: repeat(4, 1fr); }
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .project-featured { grid-column: 1 / -1; }
    .skills-grid { grid-template-columns: repeat(2, 1fr); }
    .campus-grid { grid-template-columns: repeat(3, 1fr); }
    .blog-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    .nav-links.active { display: flex; }
    .nav-links a { padding: 0.6rem 0.75rem; }
    .nav-toggle { display: flex; }

    .hero { min-height: auto; padding-top: 5.25rem; padding-bottom: 2rem; }
    .hero-name { font-size: 2rem; }
    .hero-tagline { font-size: 0.98rem; }
    .msg.bot { width: 100%; max-width: 100%; }
    .section { padding: 3rem 1rem; }
    .section-title { font-size: 1.25rem; }
    .timeline { padding-left: 1.25rem; }
    .timeline-item { padding-left: 1.25rem; }
    .timeline-dot { left: -1.8rem; width: 10px; height: 10px; }
}

@media (min-width: 960px) {
    .hero-container {
        grid-template-columns: 0.92fr 1.08fr;
        gap: 2.5rem;
        align-items: center;
    }
}
@media (min-width: 1024px) {
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
    .project-featured { grid-column: 1 / -1; }
}

/* ---- 暗色模式切换按钮 ---- */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: transparent;
    cursor: pointer;
    color: var(--color-text-muted);
    margin-left: 0.25rem;
    transition: all var(--transition);
}
.theme-toggle:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}
.theme-toggle .moon-icon { display: none; }
.theme-toggle .sun-icon { display: block; }

/* ---- 项目配图 ---- */
.project-image {
    margin-bottom: 0.85rem;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}
.project-image img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
    max-height: 320px;
}
.project-featured .project-image img {
    max-height: 400px;
}

/* ---- 岗位能力匹配 ---- */
.career-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
.career-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: all var(--transition);
    position: relative;
}
.career-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.career-card-highlight {
    border-left: 4px solid var(--color-accent);
}
.career-icon {
    font-size: 1.5rem;
    margin-bottom: 0.4rem;
}
.career-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}
.career-card p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    margin-bottom: 0.6rem;
}
.career-match {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15rem 0.55rem;
    border-radius: 12px;
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

@media (min-width: 640px) {
    .career-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .career-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ========================================
   暗色模式 (data-theme="dark")
   ======================================== */
[data-theme="dark"] {
    color-scheme: dark;
    --color-bg: #0d0d0d;
    --color-bg-alt: #121211;
    --color-surface: #1a1a19;
    --color-text: #ffffff;
    --color-text-muted: #c3c2b7;
    --color-text-light: #898781;
    --color-accent: #3987e5;
    --color-accent-light: #5aa0f0;
    --color-accent-subtle: rgba(57, 135, 229, 0.14);
    --color-border: #2c2c2a;
    --color-ring: rgba(255, 255, 255, 0.10);
    --color-tag-bg: #222220;
    --color-tag-text: #c3c2b7;
    --s1: #3987e5;
    --s2: #d95926;
    --s3: #199e70;
    --s4: #c98500;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.28);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.28), 0 8px 24px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] .hero {
    background: var(--color-bg);
}

[data-theme="dark"] .navbar {
    background: rgba(13, 13, 13, 0.82);
}

[data-theme="dark"] .theme-toggle .sun-icon { display: none; }
[data-theme="dark"] .theme-toggle .moon-icon { display: block; }

[data-theme="dark"] .project-highlight {
    background: #2d2410;
    color: #fbbf24;
}

[data-theme="dark"] .hero-console,
[data-theme="dark"] .tile,
[data-theme="dark"] .msg.bot,
[data-theme="dark"] .project-card,
[data-theme="dark"] .timeline-content,
[data-theme="dark"] .blog-card,
[data-theme="dark"] .campus-card,
[data-theme="dark"] .skill-category,
[data-theme="dark"] .career-card,
[data-theme="dark"] .contact-item,
[data-theme="dark"] .metrics-grid,
[data-theme="dark"] .cite {
    background: var(--color-surface);
    border-color: var(--color-ring);
}

[data-theme="dark"] .status-card {
    background: var(--color-accent-subtle);
    border-color: var(--color-ring);
}

[data-theme="dark"] .cite {
    border-left-color: var(--color-accent);
}

[data-theme="dark"] .timeline-dot {
    border-color: var(--color-bg);
}
[data-theme="dark"] .section-alt .timeline-dot {
    border-color: var(--color-bg-alt);
}

[data-theme="dark"] .badge-pm { background: var(--color-accent-subtle); color: var(--color-accent-light); }
[data-theme="dark"] .badge-supply { background: rgba(201, 133, 0, 0.18); color: #eda100; }
[data-theme="dark"] .badge-eng { background: rgba(25, 158, 112, 0.18); color: #1baf7a; }
[data-theme="dark"] .badge-live { background: rgba(201, 133, 0, 0.22); color: #eda100; }
[data-theme="dark"] .workstream-card {
    background: var(--color-surface);
    border-color: var(--color-border);
}

[data-theme="dark"] .project-type {
    background: var(--color-bg-alt);
}

[data-theme="dark"] .project-image {
    border-color: var(--color-border);
    background: var(--color-bg-alt);
}

[data-theme="dark"] .btn-primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
}
[data-theme="dark"] .btn-outline {
    border-color: var(--color-border);
    color: var(--color-text);
    background: var(--color-surface);
}
[data-theme="dark"] .btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent-light);
    background: var(--color-accent-subtle);
}

[data-theme="dark"] img {
    opacity: 0.92;
}
[data-theme="dark"] .hero-avatar img,
[data-theme="dark"] img:hover {
    opacity: 1;
}

/* ---- 打印样式 ---- */
@media print {
    .navbar, .hero-scroll, .nav-toggle, .theme-toggle, .back-to-top { display: none !important; }
    .hero { min-height: auto; padding: 2rem 0; }
    .hero-container { display: block; }
    .hero-console { box-shadow: none; border: 1px solid #ccc; }
    .section { padding: 1.5rem 0; break-inside: avoid; }
    body { font-size: 12pt; color: #000; background: #fff; }
    .section-alt { background: none; }
    .project-card, .timeline-content, .blog-card, .campus-card, .skill-category, .contact-item, .metrics-grid, .career-card {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
    a[href]::after { content: none !important; }
}