/* ============================================
   Shared Portfolio Styles
   ============================================ */

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

/* Dark theme (default) — slightly lighter dark */
:root, [data-theme="dark"] {
    --bg-primary: #1a2030;
    --bg-secondary: #222840;
    --bg-tertiary: #2c3450;
    --border: #3a4460;
    --text-primary: #f0f2f5;
    --text-secondary: #a8b0c0;
    --accent-blue: #6db3f2;
    --accent-purple: #c9a0ff;
    --accent-green: #7ee787;
    --accent-orange: #f0883e;
    --accent-red: #f85149;
    --nav-bg: rgba(34, 40, 64, 0.85);
    --hero-gradient-top: #1e2840;
    --tag-highlight-bg: #1c2a3e;
    --tag-highlight-border: #2a4468;
    --btn-accent-bg: #1c2a3e;
    --btn-accent-hover: #2a4468;
    --card-shadow: rgba(0, 0, 0, 0.2);
    --gradient-start: #6db3f2;
    --gradient-end: #c9a0ff;
}

/* Light theme — slightly darker warm tone */
[data-theme="light"] {
    --bg-primary: #e8e6e0;
    --bg-secondary: #dddbd4;
    --bg-tertiary: #d0cec6;
    --border: #b8b6ae;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --accent-blue: #2558cc;
    --accent-purple: #6d30d4;
    --accent-green: #16a34a;
    --accent-orange: #d97706;
    --accent-red: #dc2626;
    --nav-bg: rgba(221, 219, 212, 0.9);
    --hero-gradient-top: #dfddd6;
    --tag-highlight-bg: #ccd8ea;
    --tag-highlight-border: #9ab4d6;
    --btn-accent-bg: #ccd8ea;
    --btn-accent-hover: #9ab4d6;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --gradient-start: #2558cc;
    --gradient-end: #6d30d4;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
}

a { color: var(--accent-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Navigation ---- */
.nav {
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--bg-tertiary);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links { display: flex; gap: 24px; }

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
    text-decoration: none;
}

/* ---- Hero ---- */
.hero {
    text-align: center;
    padding: 40px 20px 40px;
    background: linear-gradient(180deg, var(--hero-gradient-top) 0%, var(--bg-primary) 100%);
    border-bottom: 1px solid var(--bg-tertiary);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.hero .subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
    letter-spacing: 0.5px;
}

.hero .location {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
    opacity: 0.6;
}

.hero .tagline {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 880px;
    margin: 0 auto;
    line-height: 1.8;
    text-wrap: pretty;
}

.hero-links {
    margin-top: 20px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---- Container ---- */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 28px 20px 48px;
}

/* ---- Section ---- */
.section { margin-bottom: 72px; }

/* ---- Bio card (subtle card between hero and first section, no heading) ---- */
.bio-section {
    padding: 28px 20px 0;
}
.bio-card {
    max-width: 920px;
    margin: 0 auto;
    background: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: 12px;
    padding: 28px;
}
.bio-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.75;
    margin-bottom: 14px;
    text-wrap: pretty;
}
.bio-card .bio-lead {
    color: var(--text-primary);
    font-size: 0.95rem;
}
.bio-card p:last-child {
    margin-bottom: 0;
}

.section-title {
    font-size: 1.4rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ---- Cards Grid ---- */
.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 768px) {
    .cards { grid-template-columns: repeat(2, 1fr); }
    .cards.single-col { grid-template-columns: 1fr; }
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: 12px;
    padding: 28px;
    transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px var(--card-shadow);
}

.card-opensource {
    background: rgba(45, 164, 78, 0.06);
    border-color: rgba(45, 164, 78, 0.2);
}

.card-opensource:hover {
    border-color: rgba(45, 164, 78, 0.5);
    background: rgba(45, 164, 78, 0.1);
}

.card.card-opensource .card-label {
    color: #3fb950;
}

.card h3 {
    font-size: 1.15rem;
    margin-bottom: 4px;
}

.card .card-label {
    font-size: 0.8rem;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 12px;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
    flex-grow: 1;
}

/* ---- Tags ---- */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 0.68rem;
}

.tag.highlight {
    background: var(--tag-highlight-bg);
    color: var(--accent-blue);
    border: 1px solid var(--tag-highlight-border);
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 10px 22px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.3s, transform 0.2s;
}

.btn:hover { transform: translateY(-1px); }

.btn:hover { text-decoration: none; }

.btn-primary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-primary:hover { background: var(--border); }

.btn-primary.btn-muted {
    color: var(--text-secondary);
}

.btn-primary.btn-muted:hover {
    color: var(--text-primary);
}

.btn-accent {
    background: var(--btn-accent-bg);
    color: var(--accent-blue);
    border: 1px solid var(--tag-highlight-border);
}

.btn-accent:hover { background: var(--btn-accent-hover); }

/* ---- Project Detail Page ---- */
.page-header {
    padding: 48px 20px 32px;
    border-bottom: 1px solid var(--bg-tertiary);
}

.page-header .breadcrumb {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 8px;
}

.page-header .page-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.content h2 {
    font-size: 1.3rem;
    margin: 32px 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--bg-tertiary);
}

.content h3 {
    font-size: 1.1rem;
    margin: 24px 0 8px;
    color: var(--accent-blue);
}

.content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.content ul, .content ol {
    color: var(--text-secondary);
    margin: 0 0 16px 24px;
}

.content li { margin-bottom: 8px; }

.content strong { color: var(--text-primary); }

/* ---- Diagram / Code Block ---- */
.diagram {
    background: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: 8px;
    padding: 20px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--accent-green);
    overflow-x: auto;
    margin: 16px 0;
    line-height: 1.8;
}

/* ---- Metrics ---- */
.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 220px));
    gap: 16px;
    margin: 20px 0;
}

.metric {
    background: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
}

.metric .number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.metric .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ---- Skills Grid ---- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.skill-group {
    background: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: 8px;
    padding: 20px;
}

.skills-section-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--bg-tertiary);
}

.skills-section-label:first-of-type {
    margin-top: 0;
}

.skill-group h4 {
    font-size: 0.85rem;
    color: var(--accent-blue);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.skill-group p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ---- Experience Timeline ---- */
.experience-entry {
    border-left: 2px solid var(--bg-tertiary);
    padding: 0 0 40px 28px;
    position: relative;
}

.experience-entry:last-child { padding-bottom: 0; }

.experience-entry::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-blue);
    border: 2px solid var(--bg-primary);
}

.experience-entry.current::before {
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.25);
}

.experience-date {
    font-size: 0.85rem;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 4px;
}

.experience-role {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.experience-company {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.experience-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.experience-summary ul {
    margin: 8px 0 0 20px;
    color: var(--text-secondary);
}

.experience-summary li {
    margin-bottom: 6px;
    font-size: 0.9rem;
}

.experience-summary strong {
    color: var(--text-primary);
}

.experience-projects {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

/* ---- Project Cards (Experience Page) ---- */
.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: 12px;
    padding: 28px;
    margin: 16px 0;
    transition: border-color 0.2s;
}

.project-card:hover {
    border-color: var(--accent-blue);
}

.project-card h3 {
    font-size: 1.15rem;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.project-card .metrics {
    margin: 16px 0;
}

.project-card .metric {
    padding: 14px;
}

.project-card .metric .number {
    font-size: 1.2rem;
}

.project-card .metric .label {
    font-size: 0.75rem;
}

.project-card .tags {
    margin-bottom: 12px;
}

.project-card .experience-projects {
    margin-bottom: 0;
}

/* ---- Compact Experience (Homepage) ---- */
.experience-compact {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 16px 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

.experience-compact:last-child { border-bottom: none; }

.experience-compact-left {
    flex: 1;
}

.experience-compact-role {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.experience-compact-company {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.experience-compact-date {
    color: var(--accent-blue);
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    margin-left: 16px;
}

@media (max-width: 600px) {
    .experience-compact {
        flex-direction: column;
        gap: 4px;
    }
    .experience-compact-date { margin-left: 0; }
}

/* ---- Article styles ---- */
.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 32px;
}

/* ---- Theme Toggle ---- */
.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s, color 0.3s;
    line-height: 1;
}

.theme-toggle:hover {
    background: var(--border);
    color: var(--text-primary);
}

/* ---- Image Lightbox ---- */
.dd-diagram img, .diagram img {
    cursor: pointer;
}

.lightbox-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    cursor: zoom-out;
}

.lightbox-overlay.active {
    display: flex;
}

.lightbox-overlay img {
    max-width: 95%;
    max-height: 95%;
    border-radius: 8px;
    box-shadow: 0 4px 40px rgba(0, 0, 0, 0.5);
}

/* ---- Footer ---- */
.footer {
    text-align: center;
    padding: 48px 20px;
    color: #5a6270;
    border-top: 1px solid var(--bg-tertiary);
    font-size: 0.85rem;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
    .hero h1 { font-size: 2rem; }
    .nav { flex-direction: column; gap: 12px; }
    .nav-links { gap: 16px; }
    .metrics { grid-template-columns: repeat(2, 1fr); }
}