/* ==========================================================================
   蒋博个人网站 — 创意工业设计风格设计系统
   Industrial Design Aesthetic: Blueprint Grid + Annotation Lines + Geometry
   ========================================================================== */

/* --- 1. CSS Variables & Design Tokens --- */
:root {
    --font-body: 'Inter', -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-display: 'Outfit', var(--font-body);
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    /* Dark Mode (Default) — Machined Steel */
    --bg-base: #0C0E14;
    --bg-card: rgba(20, 23, 32, 0.7);
    --bg-card-hover: rgba(28, 32, 46, 0.85);
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.16);

    --text-1: #F0F2F5;
    --text-2: #8B92A5;
    --text-3: #4A5068;

    --primary: #00D4AA;
    --primary-glow: rgba(0, 212, 170, 0.15);
    --secondary: #FF6B35;
    --secondary-glow: rgba(255, 107, 53, 0.15);
    --accent: #7B61FF;
    --green: #2ECC71;

    --grid-color: rgba(255, 255, 255, 0.035);
    --annotation: rgba(255, 255, 255, 0.12);

    --gradient: linear-gradient(135deg, var(--primary), var(--accent));
    --gradient-alt: linear-gradient(135deg, var(--secondary), #FFB347);

    --nav-h: 72px;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.5);
    --glass: blur(14px);
}

/* --- Light Mode --- */
[data-theme="light"] {
    --bg-base: #F4F5F7;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --border: rgba(0, 0, 0, 0.07);
    --border-hover: rgba(0, 0, 0, 0.14);

    --text-1: #1A1D26;
    --text-2: #5A6178;
    --text-3: #9BA3B8;

    --primary: #008B6E;
    --primary-glow: rgba(0, 139, 110, 0.1);
    --secondary: #D4520A;
    --secondary-glow: rgba(212, 82, 10, 0.1);
    --accent: #5B3FD4;

    --grid-color: rgba(0, 0, 0, 0.03);
    --annotation: rgba(0, 0, 0, 0.1);
    --shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.12);
}

/* --- 2. Base Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-h);
}

body {
    font-family: var(--font-body);
    background: var(--bg-base);
    color: var(--text-1);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background 0.5s, color 0.5s;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
strong { color: var(--text-1); font-weight: 600; }

.mono { font-family: var(--font-mono); }

/* --- 3. Industrial Design Decorative Layer --- */

/* 3a. Dot Grid Background */
.id-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, var(--grid-color) 1px, transparent 1px);
    background-size: 28px 28px;
}

/* 3b. Section Number Watermark */
.section__number {
    position: absolute;
    top: 40px;
    right: 40px;
    font-family: var(--font-display);
    font-size: clamp(80px, 12vw, 160px);
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1.5px var(--annotation);
    opacity: 0.4;
    pointer-events: none;
    z-index: 0;
    line-height: 1;
    user-select: none;
}

/* 3c. Registration / Crop Marks */
.hero__marks::before,
.hero__marks::after,
.contact-card__marks::before,
.contact-card__marks::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 24px;
    border-color: var(--annotation);
    border-style: solid;
    z-index: 1;
    pointer-events: none;
}
.hero__marks { position: absolute; inset: 0; pointer-events: none; }
.hero__marks::before { top: 24px; left: 24px; border-width: 1.5px 0 0 1.5px; }
.hero__marks::after { top: 24px; right: 24px; border-width: 1.5px 1.5px 0 0; }
.contact-card__marks { position: absolute; inset: 0; pointer-events: none; }
.contact-card__marks::before { bottom: 16px; left: 16px; border-width: 0 0 1.5px 1.5px; }
.contact-card__marks::after { bottom: 16px; right: 16px; border-width: 0 1.5px 1.5px 0; }

/* 3d. Annotation Line */
.id-annotation {
    position: absolute;
    top: -16px;
    right: -40px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--annotation);
    padding-left: 16px;
    border-left: 1px solid var(--annotation);
    pointer-events: none;
}
.id-annotation::before {
    content: '';
    position: absolute;
    left: -3px;
    top: 50%;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--annotation);
    transform: translateY(-50%);
}

/* 3e. Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0%;
    background: var(--gradient);
    z-index: 9999;
    transition: width 0.05s linear;
}

/* --- 4. Reusable Components --- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.btn--primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 4px 20px var(--primary-glow);
}
.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--primary-glow);
}
.btn--outline {
    background: transparent;
    color: var(--text-1);
    border: 1.5px solid var(--border-hover);
}
.btn--outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}
.btn--icon svg { flex-shrink: 0; }

.id-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--primary);
    backdrop-filter: var(--glass);
}
.id-badge--alt { color: var(--secondary); }

.tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    font-weight: 500;
    border: 1px solid var(--border);
    color: var(--text-2);
    background: var(--bg-card);
}
.tag--accent { border-color: var(--secondary); color: var(--secondary); }

.text-gradient {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.text-gradient-alt {
    background: var(--gradient-alt);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.text-accent { color: var(--secondary); }
.text-green { color: var(--green); }

.link-icon {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-2);
    font-size: 0.85rem;
    transition: var(--transition);
}
.link-icon:hover { color: var(--primary); }

.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }
.dot--green { background: var(--green); }

/* --- 5. Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-h);
    z-index: 1000;
    transition: var(--transition);
}
.navbar.scrolled {
    background: var(--bg-card);
    backdrop-filter: var(--glass);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; gap: 10px; }
.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--primary);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.8rem;
    color: var(--primary);
    letter-spacing: 1px;
}
.logo-text {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-2);
    letter-spacing: 2px;
}
.nav-menu { display: flex; align-items: center; gap: 6px; }
.nav-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-2);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    letter-spacing: 0.5px;
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: var(--primary-glow); }
.nav-link--cta { border: 1px solid var(--primary); color: var(--primary); margin-left: 8px; }
.nav-link--cta:hover { background: var(--primary); color: #fff; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-download {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-2);
    transition: var(--transition);
    letter-spacing: 0.5px;
}
.nav-download:hover { border-color: var(--primary); color: var(--primary); }
.nav-download svg { flex-shrink: 0; }
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-2);
    transition: var(--transition);
}
.theme-toggle:hover { border-color: var(--primary); color: var(--primary); }
.theme-toggle svg { width: 18px; height: 18px; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle .bar {
    width: 22px;
    height: 2px;
    background: var(--text-2);
    border-radius: 2px;
    transition: var(--transition);
}
.mobile-toggle.open .bar:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.open .bar:nth-child(2) { opacity: 0; }
.mobile-toggle.open .bar:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* --- 6. Section Base --- */
.section {
    position: relative;
    padding: 100px 0;
    z-index: 1;
    overflow: hidden;
}
.section__container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 2;
}
.section__header { margin-bottom: 56px; }
.section__header--center { text-align: center; }
.section__tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 12px;
}
.section__title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.4rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 12px;
}
.section__subtitle {
    font-size: 1rem;
    color: var(--text-2);
    max-width: 650px;
    line-height: 1.8;
}
.section__header--center .section__subtitle { margin: 0 auto; }

/* --- 7. Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--nav-h) + 40px);
}
.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero__title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 800;
    line-height: 1.2;
    margin: 16px 0;
}
.hero__subtitle {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 3vw, 1.6rem);
    font-weight: 500;
    color: var(--text-2);
    margin-bottom: 20px;
    min-height: 2.2em;
}
.cursor { animation: blink 1s step-end infinite; color: var(--primary); }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
.hero__desc {
    font-size: 0.95rem;
    color: var(--text-2);
    max-width: 540px;
    line-height: 1.8;
    margin-bottom: 28px;
}
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
.hero__links { display: flex; gap: 24px; }

/* Profile Card */
.profile-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    backdrop-filter: var(--glass);
    transition: var(--transition);
}
.profile-card:hover { border-color: var(--border-hover); transform: translateY(-4px); box-shadow: var(--shadow); }
.profile-card__glow {
    position: absolute;
    top: -40%;
    left: -20%;
    width: 160%;
    height: 160%;
    background: radial-gradient(circle at 30% 30%, var(--primary-glow), transparent 60%);
    pointer-events: none;
    z-index: -1;
}
.profile-card__header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.profile-card__avatar { position: relative; width: 72px; height: 72px; flex-shrink: 0; }
.avatar-img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
    filter: grayscale(15%);
    transition: filter 0.5s;
}
.profile-card:hover .avatar-img { filter: grayscale(0%); }
.avatar-ring {
    position: absolute;
    inset: -5px;
    border-radius: 50%;
    border: 1.5px solid var(--primary);
    opacity: 0.4;
    animation: ring-pulse 3s infinite ease-in-out;
}
@keyframes ring-pulse {
    0%, 100% { transform: scale(0.96); opacity: 0.5; }
    50% { transform: scale(1.06); opacity: 0.1; }
}
.profile-card__info h3 { font-family: var(--font-display); font-size: 1.15rem; font-weight: 700; }
.profile-card__info p { font-size: 0.8rem; color: var(--text-2); }
/* Profile Card — Contact Info */
.profile-card__contact {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 20px;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.profile-card__contact-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 0;
    font-size: 0.82rem;
    color: var(--text-2);
}
.profile-card__contact-row + .profile-card__contact-row {
    border-top: 1px solid var(--border);
}
.profile-card__contact-row svg {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    color: var(--primary);
}
.profile-card__contact-label {
    font-size: 0.7rem;
    color: var(--text-3);
    white-space: nowrap;
}
.profile-card__contact-value {
    font-weight: 500;
    color: var(--text-1);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}
.profile-card__contact-row--link {
    cursor: pointer;
    transition: var(--transition);
}
.profile-card__contact-row--link:hover {
    color: var(--primary);
}
.profile-card__qr-thumb {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
    flex-shrink: 0;
    margin-left: auto;
}
.profile-card__qr-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.btn-reveal--sm {
    padding: 3px 10px;
    font-size: 0.65rem;
    margin-left: auto;
}
.profile-card__download {
    width: 100%;
    justify-content: center;
    padding: 10px 20px;
    font-size: 0.85rem;
}

/* --- 8. AI Coach --- */
.ai-coach { background: linear-gradient(180deg, transparent, var(--primary-glow) 50%, transparent); }
.ai-coach__intro { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: start; margin-bottom: 60px; }
.ai-coach__overview { display: flex; flex-direction: column; }
.project-detail__header { margin-bottom: 20px; }
.project-detail__header .mono-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 8px;
    display: inline-block;
}
.project-detail__header h3 { font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; margin: 4px 0 8px; }
.project-detail__header p { color: var(--text-2); font-size: 0.88rem; }
.project-detail__desc { font-size: 0.9rem; color: var(--text-2); line-height: 1.7; margin-bottom: 30px; }
.feature-list { display: flex; flex-direction: column; gap: 20px; }
.feature-item { display: flex; gap: 14px; align-items: flex-start; }
.feature-item__icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--primary-glow);
    color: var(--primary);
}
.feature-item h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 2px; }
.feature-item p { font-size: 0.82rem; color: var(--text-2); line-height: 1.6; }
.project-detail__footer { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.git-stats { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-3); }
.git-stats span { display: flex; align-items: center; gap: 4px; }

/* AI Coach — Diagram Center Container */
.ai-coach__diagram-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-top: 20px;
}
.diagram-section-header {
    text-align: center;
    margin-bottom: 24px;
}
.diagram-section-header span {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 4px;
    display: block;
}
.diagram-section-header h4 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-1);
    font-family: var(--font-display);
}

/* --- 9. Projects --- */
.projects__grid {
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.project-card {
    display: grid;
    grid-template-columns: 100px 1fr;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}
.project-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow);
}

/* Sidebar with number + category */
.project-card__sidebar {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    padding: 28px 12px;
    background: var(--primary-glow);
    border-right: 2px solid var(--primary);
}
.project-card__sidebar--alt {
    background: var(--secondary-glow);
    border-right-color: var(--secondary);
}
.project-card__sidebar--accent {
    background: rgba(123,97,255,0.08);
    border-right-color: var(--accent);
}
.project-card__num {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    color: var(--primary);
}
.project-card__sidebar--alt .project-card__num { color: var(--secondary); }
.project-card__sidebar--accent .project-card__num { color: var(--accent); }
.project-card__pill {
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    text-transform: uppercase;
    text-align: center;
    white-space: nowrap;
}

/* Body */
.project-card__body { padding: 24px; }
.project-card__head { margin-bottom: 16px; }
.project-card__head h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 4px;
}
.project-card__company {
    font-size: 0.72rem;
    color: var(--text-3);
    letter-spacing: 0.5px;
}

/* Block grid — description items */
.project-card__blocks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 12px;
}
.project-card__block {
    padding: 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: rgba(255,255,255,0.02);
    transition: var(--transition);
}
[data-theme="light"] .project-card__block {
    background: rgba(0,0,0,0.02);
}
.project-card__block:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}
.project-card__block h4 {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 6px;
    letter-spacing: 0.3px;
}
.project-card__block p {
    font-size: 0.82rem;
    color: var(--text-2);
    line-height: 1.7;
}

/* --- 10. Timeline --- */
.timeline { position: relative; padding-left: 40px; }
.timeline__line { position: absolute; left: 12px; top: 0; bottom: 0; width: 2px; background: linear-gradient(180deg, var(--primary), var(--accent)); opacity: 0.3; }
.timeline__item { position: relative; margin-bottom: 48px; }
.timeline__item:last-child { margin-bottom: 0; }
.timeline__marker { position: absolute; left: -40px; }
.timeline__dot { width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--primary); background: var(--bg-base); position: relative; }
.timeline__dot::after { content: ''; position: absolute; inset: 5px; border-radius: 50%; background: var(--primary); }
.timeline__date { font-size: 0.78rem; color: var(--primary); margin-bottom: 10px; letter-spacing: 1px; }
.timeline__card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 24px; transition: var(--transition); }
.timeline__card:hover { border-color: var(--border-hover); box-shadow: var(--shadow); }
.timeline__card h3 { font-family: var(--font-display); font-size: 1.1rem; font-weight: 700; margin-bottom: 2px; }
.timeline__card h4 { font-size: 0.9rem; font-weight: 500; color: var(--text-2); margin-bottom: 4px; }
.timeline__loc { font-size: 0.72rem; color: var(--text-3); margin-bottom: 14px; }
.timeline__card ul { display: flex; flex-direction: column; gap: 10px; }
.timeline__card li { font-size: 0.85rem; color: var(--text-2); line-height: 1.7; padding-left: 14px; position: relative; }
.timeline__card li::before { content: ''; position: absolute; left: 0; top: 10px; width: 5px; height: 5px; border-radius: 50%; background: var(--primary); opacity: 0.5; }

/* --- 12. Education --- */
.education__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.edu-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 28px; position: relative; overflow: hidden; transition: var(--transition); }
.edu-card:hover { border-color: var(--border-hover); transform: translateY(-3px); box-shadow: var(--shadow); }
.edu-card__badge { position: absolute; top: 16px; right: 16px; padding: 4px 12px; border-radius: 50px; font-family: var(--font-mono); font-size: 0.65rem; font-weight: 600; letter-spacing: 1px; border: 1px solid var(--primary); color: var(--primary); }
.edu-card h3 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 700; margin-bottom: 4px; }
.edu-card__major { font-size: 0.78rem; color: var(--text-3); margin-bottom: 16px; }
.edu-card ul { display: flex; flex-direction: column; gap: 8px; }
.edu-card li { font-size: 0.85rem; color: var(--text-2); line-height: 1.6; padding-left: 14px; position: relative; }
.edu-card li::before { content: ''; position: absolute; left: 0; top: 9px; width: 5px; height: 5px; border-radius: 50%; background: var(--primary); opacity: 0.5; }

/* --- 13. Hobbies --- */
.hobbies__content { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hobbies__icon { width: 64px; height: 64px; border-radius: var(--radius-md); background: var(--secondary-glow); color: var(--secondary); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.hobbies__main h3 { font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; margin-bottom: 12px; }
.hobbies__main p { font-size: 0.9rem; color: var(--text-2); line-height: 1.8; }
.hobbies__main a { font-weight: 600; }
.hobbies__stats { display: flex; flex-direction: column; gap: 16px; }
.race-stat { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 24px; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; transition: var(--transition); }
.race-stat:hover { border-color: var(--border-hover); transform: translateX(8px); }
.race-stat__num { font-family: var(--font-display); font-size: 2.8rem; font-weight: 800; color: var(--primary); line-height: 1; }
.race-stat__unit { font-size: 1rem; color: var(--text-2); margin-right: 8px; }
.race-stat__label { font-size: 1rem; font-weight: 600; }
.race-stat__sub { font-size: 0.72rem; color: var(--text-3); margin-left: auto; }
.race-stat--total { border-color: var(--primary); background: var(--primary-glow); }
.race-stat--total .race-stat__num { color: var(--secondary); }

/* --- 14. Contact --- */
.contact-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 48px; position: relative; backdrop-filter: var(--glass); overflow: hidden; }
.contact-card__glow { position: absolute; bottom: -30%; right: -10%; width: 60%; height: 80%; background: radial-gradient(circle, var(--secondary-glow), transparent 60%); pointer-events: none; }
.contact-card__layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; position: relative; z-index: 2; }
.contact-card__info h2 { font-family: var(--font-display); font-size: 1.8rem; font-weight: 700; margin: 14px 0; }
.contact-card__info p { font-size: 0.9rem; color: var(--text-2); margin-bottom: 8px; }
.contact-card__points { margin: 12px 0 16px; display: flex; flex-direction: column; gap: 8px; }
.contact-card__points li { font-size: 0.88rem; color: var(--text-2); padding-left: 20px; position: relative; line-height: 1.6; }
.contact-card__points li::before { content: '>'; position: absolute; left: 0; color: var(--primary); font-family: var(--font-mono); font-weight: 700; }
.contact-card__sub { font-size: 0.78rem; color: var(--text-3); }
.contact-card__actions { display: flex; flex-direction: column; gap: 12px; }
.contact-item { display: flex; align-items: center; gap: 14px; padding: 14px 18px; border-radius: var(--radius-md); border: 1px solid var(--border); background: var(--bg-card); transition: var(--transition); }
.contact-item:hover { border-color: var(--border-hover); background: var(--bg-card-hover); }
.contact-item--link { cursor: pointer; }
.contact-item__icon { width: 40px; height: 40px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-item__icon--phone { background: rgba(0,212,170,0.1); color: var(--primary); }
.contact-item__icon--email { background: rgba(255,107,53,0.1); color: var(--secondary); }
.contact-item__icon--github { background: rgba(123,97,255,0.1); color: var(--accent); }
.contact-item__icon--wechat { background: rgba(46,204,113,0.1); color: var(--green); }
.contact-item__body { flex: 1; min-width: 0; }
.contact-item__label { display: block; font-size: 0.68rem; color: var(--text-3); margin-bottom: 2px; letter-spacing: 0.5px; }
.contact-item__value { font-size: 0.9rem; font-weight: 500; }
.btn-reveal { padding: 6px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: transparent; color: var(--primary); font-family: var(--font-mono); font-size: 0.7rem; cursor: pointer; transition: var(--transition); white-space: nowrap; }
.btn-reveal:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.contact-item__arrow { color: var(--text-3); transition: var(--transition); }
.contact-item--link:hover .contact-item__arrow { color: var(--primary); transform: translate(2px, -2px); }
.contact-item__qr-thumb { width: 44px; height: 44px; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border); flex-shrink: 0; }
.contact-item__qr-thumb img { width: 100%; height: 100%; object-fit: cover; }

/* --- 15. QR Modal --- */
.qr-modal { position: fixed; inset: 0; z-index: 10000; display: flex; align-items: center; justify-content: center; opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s; }
.qr-modal.active { opacity: 1; visibility: visible; }
.qr-modal__overlay { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(8px); }
.qr-modal__card { position: relative; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; text-align: center; max-width: 360px; width: 90%; transform: scale(0.9); transition: transform 0.3s; }
.qr-modal.active .qr-modal__card { transform: scale(1); }
.qr-modal__close { position: absolute; top: 12px; right: 16px; background: none; border: none; font-size: 1.8rem; color: var(--text-3); cursor: pointer; line-height: 1; transition: color 0.2s; }
.qr-modal__close:hover { color: var(--text-1); }
.qr-modal__img { width: 100%; max-width: 280px; border-radius: var(--radius-md); margin: 8px auto 16px; }
.qr-modal__hint { font-size: 0.82rem; color: var(--text-2); }

/* --- 16. Footer --- */
.footer { text-align: center; padding: 32px 24px; border-top: 1px solid var(--border); position: relative; z-index: 1; }
.footer__container { max-width: 1200px; margin: 0 auto; }
.footer p { font-size: 0.78rem; color: var(--text-3); margin-bottom: 4px; }

/* --- 17. Toast --- */
.toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px); padding: 10px 24px; border-radius: 50px; background: var(--primary); color: #fff; font-size: 0.82rem; font-weight: 600; opacity: 0; visibility: hidden; transition: all 0.3s; z-index: 10001; pointer-events: none; }
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* --- 18. Scroll Animations --- */
[data-animate] { opacity: 0; transform: translateY(30px); transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
[data-animate].visible { opacity: 1; transform: translateY(0); }

/* --- 19. Responsive --- */
@media (max-width: 1024px) {
    .hero__container { grid-template-columns: 1fr; gap: 40px; }
    .hero__visual { order: -1; }
    .ai-coach__intro { grid-template-columns: 1fr; gap: 40px; }
    .contact-card__layout { grid-template-columns: 1fr; gap: 32px; }
    .hobbies__content { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .section { padding: 72px 0; }
    .section__number { font-size: 80px; top: 20px; right: 16px; }
    .navbar.menu-open { background: var(--bg-base) !important; border-bottom: none; }
    .nav-menu {
        position: fixed;
        top: var(--nav-h);
        left: 0;
        right: 0;
        background: var(--bg-base);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
        transform: translateY(-120%);
        transition: transform 0.4s;
        z-index: 999;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    }
    .nav-menu.open { transform: translateY(0); }
    .nav-link { padding: 10px 16px; width: 100%; }
    .nav-link--cta { margin-left: 0; text-align: center; }
    .mobile-toggle { display: flex; }
    .project-card { grid-template-columns: 72px 1fr; }
    .project-card__num { font-size: 1.5rem; }
    .project-card__blocks { grid-template-columns: 1fr; }
    .education__grid { grid-template-columns: 1fr; }
    .contact-card { padding: 28px 20px; }
    .contact-item { padding: 12px 14px; gap: 10px; }
    .contact-item__value { font-size: 0.82rem; word-break: break-all; }
    .btn-reveal { padding: 5px 10px; font-size: 0.65rem; }
    .hero__marks::before, .hero__marks::after { display: none; }
    .timeline { padding-left: 32px; }
    .timeline__line { left: 8px; }
    .timeline__marker { left: -32px; }
    .timeline__dot { width: 18px; height: 18px; }
    .timeline__dot::after { inset: 4px; }
}
@media (max-width: 480px) {
    .section__container { padding: 0 16px; }
    .hero__cta { flex-direction: column; }
    .hero__cta .btn { width: 100%; justify-content: center; }
    .profile-card__contact { gap: 8px; }
    .hobbies__stats { gap: 12px; }
    .race-stat { padding: 16px; }
    .race-stat__num { font-size: 2rem; }
    .contact-card { padding: 24px 14px; }
}

/* ==========================================================================
   20. ARCHITECTURE DIAGRAM WIDGET (AI RUNNING COACH)
   ========================================================================== */

/* Outer Poster Container */
.arch-poster {
    position: relative;
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
    background: #0B1221;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    padding: 36px 24px 28px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7), 0 0 100px rgba(6, 182, 212, 0.05);
    background-image: 
        linear-gradient(to right, rgba(30, 41, 59, 0.25) 1px, transparent 1px), 
        linear-gradient(to bottom, rgba(30, 41, 59, 0.25) 1px, transparent 1px);
    background-size: 24px 24px;
    overflow: hidden;
    transition: var(--transition);
}

[data-theme="light"] .arch-poster {
    background: #f8fafc;
    border-color: rgba(0, 0, 0, 0.05);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08), 0 0 60px rgba(6, 182, 212, 0.02);
    background-image: 
        linear-gradient(to right, rgba(0, 0, 0, 0.03) 1px, transparent 1px), 
        linear-gradient(to bottom, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
}

/* Cyberpunk Corner Marks */
.arch-corner {
    position: absolute;
    width: 48px;
    height: 48px;
    pointer-events: none;
    transition: var(--transition);
}
.arch-corner--tl {
    top: 0; left: 0;
    border-top: 3px solid var(--primary);
    border-left: 3px solid var(--primary);
    border-top-left-radius: 24px;
}
.arch-corner--tr {
    top: 0; right: 0;
    border-top: 1px solid var(--text-3);
    border-right: 1px solid var(--text-3);
    border-top-right-radius: 24px;
    opacity: 0.5;
}
.arch-corner--bl {
    bottom: 0; left: 0;
    border-bottom: 1px solid var(--text-3);
    border-left: 1px solid var(--text-3);
    border-bottom-left-radius: 24px;
    opacity: 0.5;
}
.arch-corner--br {
    bottom: 0; right: 0;
    border-bottom: 3px solid var(--secondary);
    border-right: 3px solid var(--secondary);
    border-bottom-right-radius: 24px;
}

.arch-poster:hover .arch-corner--tl { transform: translate(-2px, -2px); }
.arch-poster:hover .arch-corner--br { transform: translate(2px, 2px); }

/* Header Section */
.arch-header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    z-index: 10;
}
.arch-badge {
    display: inline-block;
    background: linear-gradient(90deg, #ea580c, #f43f5e, #ea580c);
    background-size: 200% auto;
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 6px 20px;
    border-radius: 50px;
    box-shadow: 0 4px 20px rgba(244, 63, 94, 0.45);
    margin-bottom: 16px;
    letter-spacing: 1px;
    animation: gradientShift 4s linear infinite;
}
@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.arch-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}
[data-theme="light"] .arch-title {
    color: #0f172a;
}
.arch-subtitle {
    font-size: 0.85rem;
    color: var(--text-3);
    letter-spacing: 4px;
    text-transform: uppercase;
    opacity: 0.9;
}
[data-theme="light"] .arch-subtitle {
    color: #64748b;
}

/* Layer Layout */
.arch-layer-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
}
.arch-layer {
    position: relative;
    width: 100%;
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 18px;
    padding: 36px 20px 20px;
    margin-bottom: 0;
    transition: var(--transition);
}

[data-theme="light"] .arch-layer {
    background: rgba(255, 255, 255, 0.7);
}

/* Theme Rings for Layers */
.arch-layer--cyan {
    border: 2px solid rgba(6, 182, 212, 0.45);
    box-shadow: inset 0 0 25px rgba(6, 182, 212, 0.05), 0 0 15px rgba(6, 182, 212, 0.05);
}
.arch-layer--purple {
    border: 2px solid rgba(168, 85, 247, 0.45);
    box-shadow: inset 0 0 25px rgba(168, 85, 247, 0.05), 0 0 15px rgba(168, 85, 247, 0.05);
}
.arch-layer--orange {
    border: 2px solid rgba(249, 115, 22, 0.45);
    box-shadow: inset 0 0 25px rgba(249, 115, 22, 0.05), 0 0 15px rgba(249, 115, 22, 0.05);
}

[data-theme="light"] .arch-layer--cyan {
    border-color: rgba(6, 182, 212, 0.35);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.06);
}
[data-theme="light"] .arch-layer--purple {
    border-color: rgba(168, 85, 247, 0.35);
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.06);
}
[data-theme="light"] .arch-layer--orange {
    border-color: rgba(249, 115, 22, 0.35);
    box-shadow: 0 10px 30px rgba(249, 115, 22, 0.06);
}

/* Layer Header Label */
.arch-layer-header {
    position: absolute;
    top: 0; left: 50%;
    transform: translate(-50%, -50%);
    background: #0B1221;
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 20px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 12px;
    white-space: nowrap;
    z-index: 10;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
}

[data-theme="light"] .arch-layer-header {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.06);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.arch-layer-decor {
    color: #475569;
    font-size: 0.7rem;
    font-family: var(--font-mono);
}
.arch-layer-title {
    font-size: 0.92rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 0.5px;
}
.arch-layer--cyan .arch-layer-title { color: #22d3ee; }
.arch-layer--purple .arch-layer-title { color: #c084fc; }
.arch-layer--orange .arch-layer-title { color: #fb923c; }

.arch-layer-badge {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 1px solid currentColor;
    font-size: 0.65rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
}

/* Sub Grid */
.arch-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

/* Info Card inside Grid */
.arch-card {
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
    transition: var(--transition);
}

[data-theme="light"] .arch-card {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.06);
}

.arch-card:hover {
    transform: translateY(-4px);
    background: rgba(30, 41, 59, 0.7);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

[data-theme="light"] .arch-card:hover {
    background: #ffffff;
    border-color: rgba(0,0,0,0.1);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

/* Card Icon Box */
.arch-card__icon-box {
    width: 100%;
    height: 54px;
    border-radius: 8px;
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.4), rgba(15, 23, 42, 0.4));
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .arch-card__icon-box {
    background: linear-gradient(180deg, rgba(241, 245, 249, 0.6), rgba(226, 232, 240, 0.6));
    border-color: rgba(0, 0, 0, 0.04);
    box-shadow: none;
}

/* Color Variables for Text */
.text-cyan { color: #06b6d4; }
.text-purple { color: #a855f7; }
.text-orange { color: #f97316; }
.text-white { color: #ffffff; }

[data-theme="light"] .text-white { color: #475569; }

/* Card Text */
.arch-card__content h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: #f1f5f9;
    margin-bottom: 4px;
    white-space: nowrap;
}
[data-theme="light"] .arch-card__content h4 {
    color: #1e293b;
}

.arch-card__content p {
    font-size: 0.72rem;
    color: var(--text-3);
    line-height: 1.3;
}
[data-theme="light"] .arch-card__content p {
    color: #64748b;
}

/* Arrow between layers */
.arch-arrow {
    display: flex;
    justify-content: center;
    margin: -10px 0;
    z-index: 20;
    position: relative;
    pointer-events: none;
}
.arch-arrow svg {
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
    animation: arrowPulse 2s ease-in-out infinite;
}
.arch-arrow--cyan svg { fill: #22d3ee; }
.arch-arrow--purple svg { fill: #c084fc; }

@keyframes arrowPulse {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.9; }
    50% { transform: translateY(3px) scale(0.96); opacity: 0.7; }
}

/* Diagram Footer */
.arch-footer {
    text-align: center;
    margin-top: 24px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-3);
    opacity: 0.5;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-top: 1px dashed rgba(255, 255, 255, 0.05);
    padding-top: 14px;
}
[data-theme="light"] .arch-footer {
    border-top-color: rgba(0, 0, 0, 0.05);
    color: #94a3b8;
}

.arch-footer-split {
    color: var(--text-3);
}
.arch-footer-link {
    color: var(--text-3);
    transition: var(--transition);
}
.arch-footer-link:hover {
    color: var(--primary);
}

/* Responsive adjustment for Widget Grid */
@media (max-width: 768px) {
    .arch-poster {
        padding: 28px 16px 20px;
    }
    .arch-title {
        font-size: 1.5rem;
    }
    .arch-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .arch-card {
        flex-direction: row;
        align-items: center;
        text-align: left;
        padding: 12px;
        gap: 14px;
    }
    .arch-card__icon-box {
        width: 48px;
        height: 48px;
        flex-shrink: 0;
    }
    .arch-card__content {
        flex: 1;
    }
    .arch-card__content h4 {
        margin-bottom: 2px;
        white-space: normal;
    }
    .arch-layer {
        padding-top: 28px;
    }
}