:root {
    --color-bg: #F7F8FA;
    --color-surface: #FFFFFF;
    --color-surface-elevated: #F0F2F5;
    --color-border: #E1E4E8;
    --color-border-strong: #C8CDD4;
    --color-text-primary: #1A1F2E;
    --color-text-secondary: #5A6478;
    --color-text-tertiary: #8C95A6;
    --color-accent: #0A8F72;
    --color-accent-dim: #0D7A62;
    --color-accent-glow: rgba(10, 143, 114, 0.10);
    --color-warning: #D97706;
    --color-error: #DC2626;
    --color-success: #059669;
    --font-display: 'Outfit', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

body.bio-skills-page {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-display);
    color: var(--color-text-primary);
    background: var(--color-bg);
}

a { color: inherit; text-decoration: none; }

/* Nav — shared .nav-site-bar design */
.nav-site-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.nav-site-bar .nav-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    gap: 24px;
    height: 48px;
}

.nav-site-bar .nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--color-text-primary);
    flex-shrink: 0;
}

.nav-site-bar .logo svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
}

.nav-site-bar .nav-platform-link {
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav-site-links {
    display: flex;
    gap: 2px;
}

.nav-site-link {
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.nav-site-link:hover {
    color: var(--color-text-primary);
    background: var(--color-surface-elevated);
}

.nav-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
}

.nav-account-slot .nav-tab {
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
    transition: background var(--transition-fast);
}

.nav-account-slot .nav-tab:hover {
    background: var(--color-accent-glow);
}

.bs-nav-account .account-menu {
    position: relative;
}

.bs-nav-account .account-menu-toggle {
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 5px 8px 5px 5px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
}

.bs-nav-account .account-menu-toggle::-webkit-details-marker {
    display: none;
}

.bs-nav-account .account-menu-avatar {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dim));
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
}

.bs-nav-account .account-menu-name,
.bs-nav-account .account-menu-caret {
    color: var(--color-text-primary);
    font-size: 0.86rem;
    font-weight: 600;
}

.bs-nav-account .account-menu-panel {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 190px;
    display: grid;
    gap: 4px;
    padding: 10px;
    border-radius: 18px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    box-shadow: var(--shadow-lg);
    z-index: 20;
}

.bs-nav-account .account-menu-link,
.bs-nav-account .account-menu-logout {
    width: 100%;
    display: flex;
    align-items: center;
    padding: 11px 12px;
    border: 0;
    border-radius: 12px;
    background: transparent;
    color: var(--color-text-primary);
    font: inherit;
    font-size: 0.92rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}

.bs-nav-account .account-menu-link:hover,
.bs-nav-account .account-menu-logout:hover {
    background: var(--color-surface-elevated);
}

.bs-nav-account .account-menu-form {
    margin: 0;
}

/* Hero */
.bs-hero {
    max-width: 1160px;
    margin: 0 auto;
    padding: 48px 32px 32px;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 40px;
}

.bs-hero-copy { flex: 1; }

.bs-kicker {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.bs-hero h1 {
    margin: 0 0 16px;
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

.bs-hero p {
    margin: 0;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    max-width: 560px;
}

.bs-hero-stats {
    display: flex;
    gap: 28px;
    flex-shrink: 0;
}

.bs-stat { text-align: center; }
.bs-stat-value { display: block; font-size: 1.5rem; font-weight: 700; color: var(--color-accent); line-height: 1; margin-bottom: 4px; }
.bs-stat-label { font-size: 0.78rem; color: var(--color-text-tertiary); font-weight: 500; }

/* Shell */
.bs-shell {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 32px 48px;
}

/* Toolbar */
.bs-toolbar {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    align-items: center;
}

.bs-search {
    flex: 1;
    position: relative;
}

.bs-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1rem;
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.bs-search input {
    width: 100%;
    padding: 10px 14px 10px 38px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: var(--color-surface);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.bs-search input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.bs-search input::placeholder { color: var(--color-text-tertiary); }

.bs-sort {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.bs-sort select {
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: var(--color-surface);
    outline: none;
    cursor: pointer;
}

.bs-sort select:focus { border-color: var(--color-accent); }

/* Tag bar */
.bs-tag-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
    align-items: center;
}

.bs-tag {
    padding: 5px 14px;
    border-radius: 100px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bs-tag:hover { border-color: var(--color-accent); color: var(--color-accent); }
.bs-tag.active { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }

.bs-tag-bar-loading { font-size: 0.8125rem; color: var(--color-text-tertiary); }

/* Grid */
.bs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.bs-card-wrapper {
    position: relative;
}

.bs-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.bs-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.bs-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.bs-card-tag {
    font-size: 0.72rem;
    font-weight: 500;
    padding: 2px 10px;
    border-radius: 100px;
    background: var(--color-surface-elevated);
    color: var(--color-text-secondary);
}

.bs-card h3 {
    margin: 0 0 8px;
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.3;
}

.bs-card p {
    margin: 0 0 auto;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
}

.bs-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--color-border);
}

.bs-card-meta { font-size: 0.78rem; color: var(--color-text-tertiary); }
.bs-card-arrow { font-size: 1rem; color: var(--color-accent); opacity: 0; transform: translateX(-4px); transition: opacity 0.2s, transform 0.2s; }
.bs-card:hover .bs-card-arrow { opacity: 1; transform: translateX(0); }

/* Empty/loading */
.bs-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-secondary);
}

.bs-empty p { font-size: 0.9375rem; margin: 0 0 16px; }

.bs-button-secondary {
    padding: 8px 20px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bs-button-secondary:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* Detail page */
.bs-detail-shell {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 32px 48px;
}

.bs-back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 8px 0;
    margin: 24px 0 20px;
    transition: color var(--transition-fast);
}

.bs-back-link:hover { color: var(--color-accent); }

.bs-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 32px;
    margin-bottom: 8px;
}

.bs-detail-title { flex: 1; }

.bs-detail-category {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.bs-detail-title h1 {
    margin: 0 0 12px;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

.bs-detail-tagline {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin: 0 0 14px;
}

.bs-detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.bs-meta-chip {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    padding: 3px 12px;
    border-radius: 100px;
    background: var(--color-surface-elevated);
}

.bs-detail-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-end;
    flex-shrink: 0;
}

.bs-button-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 8px;
    border: none;
    background: var(--color-accent);
    color: #fff;
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.bs-button-primary:hover { background: var(--color-accent-dim); transform: translateY(-1px); }

.bs-dl-icon { font-size: 1rem; }

.bs-rate-widget { display: flex; align-items: center; gap: 10px; }
.bs-rate-stars { display: flex; gap: 2px; }

.bs-rate-star {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--color-border-strong);
    cursor: pointer;
    padding: 0;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.bs-rate-star:hover { transform: scale(1.15); }
.bs-rate-star.lit { color: #f0b429; }

.bs-rate-summary {
    display: flex;
    align-items: baseline;
    gap: 4px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.bs-rate-avg { font-weight: 700; color: var(--color-text-primary); }

.bs-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 24px;
}

.bs-tag-chip {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--color-accent);
    padding: 3px 12px;
    border-radius: 100px;
    background: var(--color-accent-glow);
}

/* Sections */
.bs-section { margin-bottom: 32px; }
.bs-section h2 { font-size: 1.1rem; font-weight: 600; margin: 0 0 12px; }
.bs-section-lead { font-size: 0.9375rem; line-height: 1.6; color: var(--color-text-secondary); margin: 0; }

.bs-md {
    font-family: var(--font-display);
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--color-text-primary);
}

.bs-md h1, .bs-md h2, .bs-md h3 { font-weight: 600; letter-spacing: -0.01em; margin: 24px 0 12px; }
.bs-md h1 { font-size: 1.6rem; }
.bs-md h2 { font-size: 1.25rem; }
.bs-md h3 { font-size: 1.05rem; }
.bs-md p { margin: 0 0 14px; }
.bs-md ul, .bs-md ol { margin: 0 0 14px; padding-left: 24px; }
.bs-md li { margin-bottom: 4px; }
.bs-md pre, .bs-md code { font-family: var(--font-mono); font-size: 0.8125rem; }
.bs-md code { background: var(--color-surface-elevated); padding: 2px 6px; border-radius: 4px; }
.bs-md pre { background: var(--color-surface-elevated); padding: 16px; border-radius: 8px; overflow-x: auto; line-height: 1.5; }
.bs-md pre code { background: none; padding: 0; }

.bs-md table { width: 100%; border-collapse: collapse; margin: 0 0 14px; font-size: 0.875rem; }
.bs-md th, .bs-md td { text-align: left; padding: 8px 12px; border: 1px solid var(--color-border); }
.bs-md th { background: var(--color-surface-elevated); font-weight: 600; font-size: 0.8125rem; }
.bs-md strong { font-weight: 600; }

.bs-md blockquote {
    margin: 0 0 14px;
    padding: 8px 16px;
    border-left: 3px solid var(--color-accent);
    background: var(--color-accent-glow);
    border-radius: 0 8px 8px 0;
}

.bs-file-list { list-style: none; padding: 0; margin: 0; }
.bs-file-list li {
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    margin-bottom: 6px;
    font-size: 0.875rem;
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bs-file-loading { color: var(--color-text-tertiary); font-family: var(--font-display) !important; font-style: italic; }

.bs-howto { padding-left: 20px; margin: 0; }
.bs-howto li { margin-bottom: 8px; font-size: 0.9375rem; line-height: 1.6; color: var(--color-text-secondary); }
.bs-howto code { font-family: var(--font-mono); font-size: 0.8125rem; background: var(--color-surface-elevated); padding: 2px 6px; border-radius: 4px; }

/* Install command */
.bs-install-cmd {
    display: flex;
    align-items: stretch;
    gap: 0;
    margin-top: 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--color-surface-elevated);
}

.bs-install-code {
    flex: 1;
    padding: 14px 16px;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    overflow-x: auto;
    white-space: pre;
    -webkit-overflow-scrolling: touch;
}

.bs-install-url {
    color: var(--color-accent);
}

.bs-copy-btn {
    flex-shrink: 0;
    padding: 0 18px;
    border: none;
    border-left: 1px solid var(--color-border);
    background: var(--color-surface);
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-accent);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.bs-copy-btn:hover { background: var(--color-accent-glow); }

/* Footer */
.bs-footer {
    border-top: 1px solid var(--color-border);
    padding: 20px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1160px;
    margin: 0 auto;
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.bs-footer a { font-weight: 500; transition: color var(--transition-fast); }
.bs-footer a:hover { color: var(--color-accent); }

/* Toast */
.bs-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 24px;
    border-radius: 8px;
    background: var(--color-text-primary);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

/* Admin toggle + bar */
.bs-admin-toggle {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 60;
    transition: box-shadow var(--transition-fast), transform var(--transition-fast);
    user-select: none;
}

.bs-admin-toggle:hover {
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.bs-admin-bar {
    position: fixed;
    bottom: 78px;
    right: 24px;
    display: flex;
    gap: 8px;
    padding: 14px 18px;
    border-radius: 12px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    z-index: 55;
}

.bs-admin-bar-actions { display: flex; gap: 8px; }
.bs-upload-label { cursor: pointer; }

/* Delete button on cards */
.bs-card-delete {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: none;
    background: var(--color-surface);
    color: var(--color-text-tertiary);
    font-size: 0.75rem;
    cursor: pointer;
    z-index: 2;
    opacity: 0;
    transition: opacity var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.bs-card-wrapper:hover .bs-card-delete {
    opacity: 1;
}

.bs-card-delete:hover {
    background: var(--color-error);
    color: #fff;
}

/* Responsive */
@media (max-width: 900px) {
    .bs-hero { flex-direction: column; align-items: stretch; padding: 32px 24px 24px; gap: 24px; }
    .bs-hero-stats { justify-content: flex-start; gap: 24px; }
    .bs-shell { padding: 0 24px 32px; }
    .bs-detail-shell { padding: 0 24px 32px; }
    .bs-detail-header { flex-direction: column; gap: 20px; }
    .bs-detail-actions { align-items: stretch; }
}

@media (max-width: 600px) {
    .bs-toolbar { flex-direction: column; gap: 12px; }
    .bs-sort { width: 100%; }
    .bs-sort select { flex: 1; }
    .bs-grid { grid-template-columns: 1fr; }
    .bs-hero { padding: 24px 16px 20px; }
    .bs-hero h1 { font-size: 1.5rem; }
    .bs-shell { padding: 0 16px 24px; }
    .bs-detail-shell { padding: 0 16px 24px; }
    .bs-nav-inner { padding: 0 16px; gap: 12px; }
    .bs-nav-links { overflow-x: auto; white-space: nowrap; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
    .bs-nav-links::-webkit-scrollbar { display: none; }
    .bs-nav-links a { padding: 8px 10px; font-size: 0.8125rem; }
    .bs-footer { flex-direction: column; gap: 8px; text-align: center; }
}