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

:root {
    color-scheme: light;
    scroll-padding-top: 68px;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-soft: rgba(37, 99, 235, 0.1);
    --on-primary: #ffffff;
    --bg: #ffffff;
    --bg-secondary: #f7f8f8;
    --bg-tertiary: #eef1f0;
    --surface: #ffffff;
    --text: #191c20;
    --text-secondary: #515862;
    --text-muted: #626b77;
    --border: #dfe4e3;
    --border-strong: #c8d0ce;
    --success: #15803d;
    --danger: #c2413a;
    --shadow-sm: 0 1px 2px rgba(25, 28, 32, 0.06);
    --shadow: 0 2px 8px rgba(25, 28, 32, 0.07);
    --shadow-md: 0 10px 28px rgba(25, 28, 32, 0.09);
    --shadow-lg: 0 18px 42px rgba(25, 28, 32, 0.12);
    --radius: 8px;
    --radius-sm: 6px;
    --transition: 160ms ease;
}

[data-theme="dark"] {
    color-scheme: dark;
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-soft: rgba(59, 130, 246, 0.16);
    --on-primary: #ffffff;
    --bg: #141618;
    --bg-secondary: #1b1e21;
    --bg-tertiary: #25292d;
    --surface: #191c1f;
    --text: #f3f5f5;
    --text-secondary: #b8bec5;
    --text-muted: #89929c;
    --border: #30353a;
    --border-strong: #444b51;
    --success: #86efac;
    --danger: #fca5a5;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.18);
    --shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.38);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.app { display: flex; flex-direction: column; min-height: 100vh; }

.header {
    position: fixed; top: 0; left: 0; right: 0;
    border-bottom: 1px solid var(--border); z-index: 100;
    backdrop-filter: blur(16px); background: rgba(255, 255, 255, 0.92);
}
[data-theme="dark"] .header { background: rgba(20, 22, 24, 0.92); }

.header-inner {
    max-width: 1120px; margin: 0 auto; padding: 0 24px; height: 68px;
    display: flex; align-items: center; justify-content: space-between;
}

.logo { min-width: 0; display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.logo-icon { width: 34px; height: 34px; flex: 0 0 auto; display: grid; place-items: center; border-radius: var(--radius); background: var(--primary-soft); font-size: 19px; }
.logo-text { max-width: 180px; overflow: hidden; font-size: 1rem; font-weight: 600; letter-spacing: 0; text-overflow: ellipsis; white-space: nowrap; }

.nav { display: flex; align-items: center; gap: 2px; }
.nav-link {
    min-height: 36px; padding: 7px 12px; border-radius: var(--radius-sm); color: var(--text-secondary);
    text-decoration: none; font-size: 0.875rem; font-weight: 500; transition: color var(--transition), background-color var(--transition);
    cursor: pointer; border: none; background: transparent;
}
.nav-link:hover { color: var(--text); background: var(--bg-tertiary); }
.nav-link.active { color: var(--primary-dark); background: var(--primary-soft); }
[data-theme="dark"] .nav-link.active { color: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 6px; }

.header-icon-action {
    width: 36px; height: 36px; border-radius: var(--radius-sm); border: 1px solid transparent;
    background: transparent; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
    transition: color var(--transition), background-color var(--transition), border-color var(--transition); color: var(--text-secondary); text-decoration: none;
}
.header-icon-action:hover { border-color: var(--border); background: var(--bg-secondary); color: var(--text); }
.header-icon-action svg { width: 20px; height: 20px; }


.language-switch {
    min-width: 36px; height: 36px; padding: 0 8px; display: inline-flex; align-items: center; justify-content: center;
    border: 1px solid transparent; border-radius: var(--radius-sm); color: var(--text-secondary); background: transparent;
    font-size: 0.75rem; line-height: 1; font-weight: 600; text-decoration: none; transition: color var(--transition), background-color var(--transition), border-color var(--transition);
}
.language-switch:hover { border-color: var(--border); color: var(--primary-dark); background: var(--bg-secondary); }


.logo:focus-visible, .nav-link:focus-visible, .hero-link:focus-visible, .mobile-nav-link:focus-visible {
    outline: 2px solid var(--primary); outline-offset: 2px;
}

.language-switch:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.header-icon-action:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.main { flex: 1; padding-top: 68px; }

.page { display: none; animation: fadeIn 0.22s ease; }
.page.active { display: block; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.container { max-width: 1120px; margin: 0 auto; padding: 48px 24px 72px; }

.hero { min-height: calc(100svh - 68px - 57px - 72px); padding: 64px 24px 72px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; background: var(--bg); }
.hero-avatar { width: 112px; height: 112px; border-radius: 50%; margin: 0 auto 24px; overflow: hidden; border: 3px solid var(--surface); box-shadow: 0 0 0 1px var(--border), var(--shadow-md); }
.hero-avatar img { width: 100%; height: 100%; object-fit: cover; }
.hero-title { font-size: 2.25rem; line-height: 1.2; font-weight: 700; letter-spacing: 0; margin-bottom: 10px; }
.hero-subtitle { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 14px; }
.hero-slogan { max-width: 620px; font-family: 'Snell Roundhand', 'Segoe Script', 'Brush Script MT', 'Apple Chancery', cursive; font-size: 1.08rem; color: var(--text-muted); font-style: normal; }
.hero-links { display: flex; justify-content: center; gap: 10px; margin-top: 30px; flex-wrap: wrap; }
.hero-link { min-height: 42px; display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: var(--radius-sm); text-decoration: none; font-weight: 600; font-size: 0.86rem; transition: color var(--transition), background-color var(--transition), border-color var(--transition), box-shadow var(--transition); }
.hero-link-primary { background: var(--primary); color: var(--on-primary); }
.hero-link-primary:hover { background: var(--primary-dark); box-shadow: var(--shadow); }
.hero-link-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.hero-link-secondary:hover { border-color: var(--border-strong); background: var(--bg-secondary); }
.hero-link svg { width: 18px; height: 18px; }

.announcement-banner { border-bottom: 1px solid var(--border); background: var(--bg-secondary); }
.announcement-inner { max-width: 1120px; min-height: 57px; margin: 0 auto; padding: 11px 24px; display: flex; align-items: center; gap: 24px; }
.announcement-track { min-width: 0; display: grid; flex: 1; overflow: hidden; }
.announcement-slide { grid-area: 1 / 1; min-width: 0; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 12px; visibility: hidden; opacity: 0; pointer-events: none; transform: translateY(8px); transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s; }
.announcement-slide.is-active { visibility: visible; opacity: 1; pointer-events: auto; transform: translateY(0); }
.announcement-slide.is-leaving { visibility: visible; opacity: 0; transform: translateY(-8px); }
.announcement-icon { font-size: 1.05rem; line-height: 1; }
.announcement-slide p { min-width: 0; color: var(--text-secondary); font-size: 0.84rem; line-height: 1.55; overflow-wrap: anywhere; }
.announcement-slide a { display: inline-flex; align-items: center; gap: 5px; color: var(--primary); font-size: 0.8rem; font-weight: 500; text-decoration: none; white-space: nowrap; }
.announcement-slide a:hover { color: var(--primary-dark); }
.announcement-slide a svg { width: 13px; height: 13px; }
.announcement-dots { max-width: 72px; display: flex; flex: 0 0 auto; flex-wrap: wrap; align-items: center; justify-content: flex-end; }
.announcement-dot { width: 24px; height: 24px; padding: 0; display: grid; place-items: center; border: none; border-radius: 50%; background: transparent; cursor: pointer; }
.announcement-dot::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--text-muted); opacity: 0.5; transition: background var(--transition), opacity var(--transition), transform var(--transition); }
.announcement-dot:hover::before { opacity: 0.9; }
.announcement-dot:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; }
.announcement-dot.is-active::before { background: var(--primary); opacity: 1; transform: scale(1.15); }
.announcement-dot:only-child { display: none; }

@media (prefers-reduced-motion: reduce) {
    .announcement-slide, .announcement-dot { transition: none; }
}

.resume-container { max-width: 960px; margin: 0 auto; padding: 56px 24px 80px; }
.resume-heading { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.resume-pdf-download { min-height: 32px; padding: 5px 9px; display: inline-flex; align-items: center; justify-content: center; gap: 5px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-secondary); background: var(--surface); font: inherit; font-size: 0.74rem; line-height: 1.25; font-weight: 600; cursor: pointer; transition: color var(--transition), background-color var(--transition), border-color var(--transition); }
.resume-pdf-download:hover { border-color: var(--primary); color: var(--primary-dark); background: var(--primary-soft); }
.resume-pdf-download:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.resume-pdf-download:disabled { cursor: wait; opacity: 0.65; }
.resume-pdf-download.is-unavailable { border-color: var(--border); color: var(--text-muted); background: var(--bg-tertiary); }
.resume-pdf-download svg { width: 14px; height: 14px; flex: 0 0 auto; }
.resume-profile { display: grid; grid-template-columns: minmax(0, 1fr) 104px; gap: 44px; align-items: start; padding-bottom: 44px; border-bottom: 1px solid var(--border); }
.resume-profile-content { min-width: 0; }
.resume-name { font-size: 1.8rem; line-height: 1.25; font-weight: 700; letter-spacing: 0; }
.resume-contacts { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; margin-top: 12px; color: var(--text-secondary); }
.resume-contact { display: inline-flex; align-items: center; gap: 6px; max-width: 100%; color: inherit; font-size: 0.84rem; line-height: 1.5; text-decoration: none; }
a.resume-contact:hover { color: var(--primary); }
.resume-contact svg { width: 15px; height: 15px; flex: 0 0 auto; }
.resume-contact span { overflow-wrap: anywhere; }
.resume-email-group { max-width: 100%; display: inline-flex; align-items: center; gap: 3px; }
.resume-copy-button { width: 27px; height: 27px; flex: 0 0 auto; display: inline-flex; align-items: center; justify-content: center; border: none; border-radius: var(--radius-sm); color: var(--text-muted); background: transparent; cursor: pointer; transition: color var(--transition), background-color var(--transition); }
.resume-copy-button:hover { color: var(--primary); background: var(--bg-tertiary); }
.resume-copy-button:focus-visible { outline: 2px solid var(--primary); outline-offset: 1px; }
.resume-copy-button svg { width: 15px; height: 15px; }
.resume-copy-success-icon { display: none; }
.resume-copy-button.is-copied { color: var(--success); background: color-mix(in srgb, var(--success) 12%, transparent); }
.resume-copy-button.is-copied .resume-copy-icon { display: none; }
.resume-copy-button.is-copied .resume-copy-success-icon { display: block; }
.resume-introduction { max-width: 700px; margin-top: 20px; color: var(--text-secondary); font-size: 0.96rem; line-height: 1.8; }
.research-interests { max-width: 720px; margin-top: 16px; display: flex; flex-wrap: wrap; gap: 7px; }
.research-interests span { padding: 4px 8px; border: 1px solid var(--border); border-radius: 4px; color: var(--text-secondary); background: var(--bg-secondary); font-size: 0.75rem; line-height: 1.4; }
.resume-avatar { width: 104px; height: 104px; overflow: hidden; border: 3px solid var(--surface); border-radius: 50%; box-shadow: 0 0 0 1px var(--border), var(--shadow); }
.resume-avatar img { width: 100%; height: 100%; object-fit: cover; }
.resume-section { margin-top: 48px; }
.resume-section-title { margin-bottom: 22px; font-size: 1.25rem; line-height: 1.3; font-weight: 600; letter-spacing: 0; }

.education-list { display: flex; flex-direction: column; }
.education-item { display: grid; grid-template-columns: 124px 20px minmax(0, 1fr); column-gap: 16px; min-height: 112px; }
.education-date { padding-top: 1px; color: var(--text-muted); font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.education-rail { position: relative; display: flex; justify-content: center; }
.education-rail::after { content: ''; position: absolute; top: 18px; bottom: 0; width: 1px; background: var(--border); }
.education-item:last-child .education-rail::after { display: none; }
.education-rail span { position: relative; z-index: 1; width: 10px; height: 10px; margin-top: 6px; border: 2px solid var(--primary); border-radius: 50%; background: var(--surface); }
.education-content { padding-bottom: 32px; }
.education-content h3 { font-size: 1rem; line-height: 1.4; font-weight: 600; }
.education-degree { margin-top: 4px; color: var(--text-secondary); font-size: 0.9rem; }
.education-description { margin-top: 8px; color: var(--text-muted); font-size: 0.86rem; line-height: 1.65; }

.awards-list { border-top: 1px solid var(--border); }
.award-item { display: grid; grid-template-columns: 124px minmax(0, 1fr); gap: 36px; padding: 20px 0; border-bottom: 1px solid var(--border); }
.award-date { color: var(--text-muted); font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.award-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; }
.award-heading h3 { font-size: 0.96rem; font-weight: 600; }
.award-heading span { flex: 0 0 auto; color: var(--text-muted); font-size: 0.8rem; }
.award-content p { margin-top: 6px; color: var(--text-secondary); font-size: 0.86rem; line-height: 1.6; }

.works-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.work-card { min-height: 270px; padding: 20px; display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); transition: border-color var(--transition), box-shadow var(--transition); }
.work-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow); }
.work-card-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.work-type { padding: 3px 8px; border-radius: 4px; font-size: 0.72rem; line-height: 1.4; font-weight: 600; }
.work-card-project .work-type { color: var(--primary-dark); background: var(--primary-soft); }
.work-card-paper .work-type { color: var(--success); background: color-mix(in srgb, var(--success) 12%, transparent); }
[data-theme="dark"] .work-card-project .work-type { color: var(--primary); }
.work-meta { color: var(--text-muted); font-size: 0.78rem; font-weight: 500; }
.work-card h3 { margin-top: 18px; font-size: 1.08rem; line-height: 1.5; font-weight: 600; overflow-wrap: anywhere; }
.work-context { margin-top: 8px; color: var(--text-muted); font-size: 0.82rem; line-height: 1.55; }
.work-description { margin-top: 14px; color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; }
.work-card-footer { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-top: auto; padding-top: 24px; }
.work-keywords { display: flex; flex-wrap: wrap; gap: 6px; }
.work-keywords span { padding: 3px 7px; border-radius: 4px; color: var(--text-secondary); background: var(--bg-tertiary); font-size: 0.7rem; line-height: 1.4; }
.work-links { display: flex; flex: 0 0 auto; gap: 12px; }
.work-links a { display: inline-flex; align-items: center; gap: 5px; color: var(--primary); font-size: 0.8rem; font-weight: 500; text-decoration: none; }
.work-links a:hover { color: var(--primary-dark); }
.work-links svg { width: 13px; height: 13px; }

.section-title { font-size: 1.4rem; font-weight: 600; margin-bottom: 24px; letter-spacing: 0; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }

.bookmark-search { margin-bottom: 24px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.bookmark-search-field { position: relative; width: min(100%, 560px); }
.bookmark-search-icon { position: absolute; top: 50%; left: 14px; width: 18px; height: 18px; color: var(--text-muted); pointer-events: none; transform: translateY(-50%); }
.bookmark-search-icon svg { width: 100%; height: 100%; }
.bookmark-search-field input { width: 100%; height: 42px; padding: 0 44px 0 42px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); background: var(--surface); font: inherit; font-size: 0.88rem; outline: none; transition: border-color var(--transition), box-shadow var(--transition); }
.bookmark-search-field input::placeholder { color: var(--text-muted); }
.bookmark-search-field input::-webkit-search-cancel-button { appearance: none; }
.bookmark-search-field input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.bookmark-search-clear { position: absolute; top: 50%; right: 8px; width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center; border: none; border-radius: 6px; color: var(--text-muted); background: transparent; cursor: pointer; transform: translateY(-50%); }
.bookmark-search-clear:hover { color: var(--text); background: var(--bg-tertiary); }
.bookmark-search-clear:focus-visible { outline: 2px solid var(--primary); outline-offset: 1px; }
.bookmark-search-clear svg { width: 16px; height: 16px; }
.bookmark-search-clear[hidden] { display: none; }
.bookmark-search-status { flex: 0 0 auto; color: var(--text-muted); font-size: 0.82rem; }
.bookmark-search-empty { padding: 56px 16px; color: var(--text-muted); text-align: center; }
.bookmark-search-empty[hidden], .bookmark-category[hidden], .bookmark-link[hidden] { display: none; }
.bookmark-tag-filter { margin: -4px 0 28px; display: flex; flex-wrap: wrap; gap: 8px; }
.bookmark-tag-filter-button { min-height: 30px; padding: 5px 10px; display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-secondary); background: var(--surface); font: inherit; font-size: 0.76rem; line-height: 1.2; cursor: pointer; transition: color var(--transition), background-color var(--transition), border-color var(--transition); }
.bookmark-tag-filter-button:hover { border-color: var(--text-muted); color: var(--text); background: var(--bg-secondary); }
.bookmark-tag-filter-button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.bookmark-tag-filter-button.is-active { border-color: var(--primary); color: var(--primary-dark); background: var(--primary-soft); }
[data-theme="dark"] .bookmark-tag-filter-button.is-active { color: var(--primary); }
.bookmark-tag-filter-button span { color: var(--text-muted); font-size: 0.68rem; font-variant-numeric: tabular-nums; }
.bookmark-categories { display: flex; flex-direction: column; gap: 36px; }
.bookmark-category { min-width: 0; }
.category-header {
    width: 100%; display: flex; align-items: center; justify-content: space-between; padding: 0 0 12px;
    border: none; border-bottom: 1px solid var(--border); color: var(--text); background: transparent; font: inherit; text-align: left; cursor: pointer; transition: color var(--transition), border-color var(--transition);
}
.category-header:hover { color: var(--primary); }
.category-header:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.category-title { display: flex; align-items: center; gap: 12px; font-weight: 600; }
.category-count { min-width: 24px; padding: 2px 7px; border-radius: 10px; color: var(--text-muted); background: var(--bg-tertiary); font-size: 0.7rem; line-height: 1.4; font-weight: 500; text-align: center; }
.category-toggle { width: 20px; height: 20px; color: var(--text-muted); transition: var(--transition); }
.category-toggle.expanded { transform: rotate(180deg); }
.bookmark-links { display: none; padding-top: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.bookmark-links.show { display: grid; }
.bookmark-link {
    min-width: 0; min-height: 128px; padding: 14px; display: flex; flex-direction: column;
    border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); background: var(--surface);
    text-decoration: none; transition: border-color var(--transition), background-color var(--transition), box-shadow var(--transition);
}
.bookmark-link:hover { border-color: var(--border-strong); background: var(--bg-secondary); box-shadow: var(--shadow-sm); }
.bookmark-link:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.bookmark-link-heading { min-width: 0; display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; font-size: 0.9rem; line-height: 1.45; font-weight: 600; }
.bookmark-link-heading > span { min-width: 0; overflow-wrap: anywhere; }
.bookmark-link-heading svg { width: 14px; height: 14px; flex: 0 0 auto; margin-top: 2px; color: var(--text-muted); }
.bookmark-link-description { margin-top: 7px; display: -webkit-box; overflow: hidden; color: var(--text-secondary); font-size: 0.77rem; line-height: 1.55; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.bookmark-link-tags { margin-top: auto; padding-top: 12px; display: flex; flex-wrap: wrap; gap: 5px; }
.bookmark-link-tags > span { padding: 2px 6px; border-radius: 4px; color: var(--text-secondary); background: var(--bg-tertiary); font-size: 0.66rem; line-height: 1.4; }

.app-directory { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.app-directory-link { min-height: 132px; padding: 18px; display: grid; grid-template-columns: 40px minmax(0, 1fr) 18px; align-items: start; gap: 14px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); background: var(--surface); text-decoration: none; transition: border-color var(--transition), background-color var(--transition), box-shadow var(--transition); }
.app-directory-link:hover { border-color: var(--border-strong); background: var(--bg-secondary); box-shadow: var(--shadow-sm); }
.app-directory-link:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.app-directory-icon { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-sm); color: var(--primary-dark); background: var(--primary-soft); }
[data-theme="dark"] .app-directory-icon { color: var(--primary); }
.app-directory-icon svg { width: 21px; height: 21px; }
.app-directory-copy { min-width: 0; }
.app-directory-copy strong { display: block; font-size: 0.92rem; font-weight: 600; }
.app-directory-copy span { display: block; margin-top: 7px; color: var(--text-secondary); font-size: 0.77rem; line-height: 1.55; }
.app-directory-arrow { width: 17px; height: 17px; margin-top: 2px; color: var(--text-muted); transform: rotate(180deg); }


.ai-chat[hidden] { display: none; }
.ai-chat { position: fixed; inset: 0; z-index: 240; display: flex; align-items: flex-end; justify-content: flex-end; padding: 24px; background: rgba(15, 23, 42, 0.34); backdrop-filter: blur(4px); }
.ai-chat-panel { width: min(420px, 100%); max-height: min(620px, calc(100vh - 48px)); display: flex; flex-direction: column; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-lg); }
.ai-chat-header { min-height: 54px; padding: 10px 14px 10px 18px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--border); }
.ai-chat-header h2 { margin: 0; font-size: 0.95rem; font-weight: 600; }
.ai-chat-close { width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; border: none; border-radius: var(--radius-sm); color: var(--text-secondary); background: transparent; cursor: pointer; }
.ai-chat-close:hover { color: var(--text); background: var(--bg-tertiary); }
.ai-chat-close:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.ai-chat-close svg { width: 17px; height: 17px; }
.ai-chat-messages { min-height: 0; flex: 1 1 auto; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.ai-chat-message { max-width: 88%; padding: 9px 11px; border-radius: var(--radius-sm); color: var(--text); background: var(--bg-tertiary); font-size: 0.86rem; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere; }
.ai-chat-message-user { align-self: flex-end; color: var(--on-primary); background: var(--primary); }
.ai-chat-form { padding: 10px; display: flex; align-items: flex-end; gap: 8px; border-top: 1px solid var(--border); }
.ai-chat-form textarea { min-width: 0; min-height: 40px; max-height: 112px; flex: 1; resize: vertical; padding: 9px 10px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); background: var(--surface); font: inherit; font-size: 0.84rem; outline: none; }
.ai-chat-form textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.ai-chat-send { min-height: 40px; padding: 0 13px; border: 1px solid var(--primary); border-radius: var(--radius-sm); color: var(--on-primary); background: var(--primary); font: inherit; font-size: 0.82rem; cursor: pointer; }
.ai-chat-send:disabled { opacity: 0.55; cursor: wait; }


.footer { border-top: 1px solid var(--border); padding: 24px; text-align: center; color: var(--text-muted); background: var(--bg-secondary); font-size: 0.8rem; }
.footer p { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 4px 8px; }
.footer-segment { display: inline-flex; align-items: center; }
.footer-segment + .footer-segment::before { content: '·'; margin-right: 8px; color: var(--text-muted); }
.footer a { color: var(--text-secondary); text-decoration: none; }
.footer a:hover { color: var(--primary); }
.visitor-counter strong { margin-left: 4px; color: var(--text-secondary); font-weight: 600; font-variant-numeric: tabular-nums; }

.back-to-top {
    position: fixed; right: 24px; bottom: 24px; z-index: 90;
    width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
    border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-secondary);
    background: var(--surface); box-shadow: var(--shadow); cursor: pointer;
    animation: backToTopIn 0.2s ease; transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.back-to-top[hidden] { display: none; }
.back-to-top:hover { color: var(--primary); background: var(--bg-secondary); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.back-to-top:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
.back-to-top-progress { position: absolute; inset: 0; width: 44px; height: 44px; fill: none; transform: rotate(-90deg); }
.back-to-top-track { stroke: var(--border); stroke-width: 2; }
.back-to-top-value { stroke: var(--primary); stroke-width: 2; stroke-linecap: round; stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset 0.12s linear; }
.back-to-top-icon { position: relative; width: 18px; height: 18px; }
@keyframes backToTopIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
    .page, .announcement-slide, .announcement-dot { animation: none; transition: none; }
    .back-to-top { animation: none; transition: none; }
    .back-to-top-value { transition: none; }
}

@media (max-width: 768px) {
    .header-inner { height: 60px; padding: 0 14px; }
    :root { scroll-padding-top: 60px; }
    .main { padding-top: 60px; }
    .nav { display: none; }
    .hero { min-height: calc(100svh - 60px - 72px - 70px); padding: 48px 16px 52px; }
    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .hero-links { margin-top: 26px; }
    .announcement-inner { min-height: 72px; padding: 12px 16px; gap: 16px; }
    .announcement-slide { grid-template-columns: auto minmax(0, 1fr); gap: 7px 10px; }
    .announcement-slide a { grid-column: 2; justify-self: start; }
    .container { padding: 36px 16px 96px; }
    .bookmark-search { align-items: stretch; flex-direction: column; gap: 10px; }
    .bookmark-search-field { width: 100%; }
    .bookmark-search-status { align-self: flex-start; }
    .bookmark-tag-filter { gap: 6px; }
    .bookmark-links { grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); gap: 8px; }
    .bookmark-link { min-height: 126px; padding: 11px; }
    .bookmark-link-heading { gap: 7px; font-size: 0.82rem; }
    .bookmark-link-description { margin-top: 6px; font-size: 0.7rem; }
    .bookmark-link-tags { padding-top: 9px; gap: 4px; }
    .bookmark-link-tags > span { padding: 2px 5px; font-size: 0.62rem; }
    .app-directory { grid-template-columns: 1fr; gap: 8px; }
    .app-directory-link { min-height: 112px; padding: 14px; }
    .resume-container { padding: 40px 16px 96px; }
    .resume-profile { grid-template-columns: 1fr; gap: 20px; padding-bottom: 36px; }
    .resume-profile-content { grid-row: 2; }
    .resume-name { font-size: 1.65rem; }
    .resume-avatar { grid-row: 1; width: 88px; height: 88px; }
    .resume-introduction { font-size: 0.94rem; }
    .resume-contacts { gap: 8px 16px; }
    .resume-section { margin-top: 42px; }
    .education-item { grid-template-columns: 18px minmax(0, 1fr); column-gap: 12px; min-height: 0; }
    .education-date { grid-column: 2; grid-row: 1; padding: 0 0 5px; }
    .education-rail { grid-column: 1; grid-row: 1 / span 2; }
    .education-content { grid-column: 2; grid-row: 2; padding-bottom: 30px; }
    .award-item { grid-template-columns: 1fr; gap: 7px; }
    .award-heading { align-items: flex-start; flex-direction: column; gap: 4px; }
    .works-grid { grid-template-columns: 1fr; }
    .work-card { min-height: 0; }
    .back-to-top { right: 16px; bottom: calc(96px + env(safe-area-inset-bottom)); }
    .footer { padding: 20px 16px calc(88px + env(safe-area-inset-bottom)); font-size: 0.78rem; }
}

@media (max-width: 420px) {
    .hero-link { flex: 1 1 132px; justify-content: center; }
}

@media (max-width: 350px) {
    .logo-text { display: none; }
    .container { padding-right: 12px; padding-left: 12px; }
}

@media (max-width: 520px) {
    .ai-chat { padding: 12px; }
    .ai-chat-panel { max-height: calc(100svh - 24px); }
}

.mobile-nav {
    display: none; position: fixed; bottom: 0; left: 0; right: 0;
    background: rgba(255, 255, 255, 0.94); border-top: 1px solid var(--border);
    padding: 6px 10px; padding-bottom: calc(6px + env(safe-area-inset-bottom)); z-index: 100; backdrop-filter: blur(16px);
}
[data-theme="dark"] .mobile-nav { background: rgba(20, 22, 24, 0.94); }
@media (max-width: 768px) { .mobile-nav { display: flex; justify-content: space-around; } }
.mobile-nav-link {
    min-width: 0; min-height: 54px; flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
    padding: 5px 4px; color: var(--text-muted); text-decoration: none; font-size: 0.68rem;
    font-weight: 500; transition: color var(--transition), background-color var(--transition); cursor: pointer; border: none; border-radius: var(--radius-sm); background: transparent;
}
.mobile-nav-link svg { width: 21px; height: 21px; }
.mobile-nav-link.active { color: var(--primary); }