/* ——— Design System — Blueprint §3 ——— */
:root, [data-theme="dark"] {
  --bg-dark: #131A24;
  --bg-surface: #1C2633;
  --bg-card: rgba(28, 38, 51, 0.82);
  --bg-card-hover: rgba(36, 50, 68, 0.92);
  --bg-glass: rgba(255, 255, 255, 0.035);
  --bg-glass-heavy: rgba(19, 26, 36, 0.92);
  --bg-tag: rgba(160, 180, 195, 0.10);
  --color-primary: #A9C4D6;
  --color-secondary: #D9A28B;
  --color-tertiary: #4A6582;
  --color-surface: #3A5068;
  --text-main: #E8EEF3;
  --text-muted: #9FB3C2;
  --text-subtle: #7D92A3;
  --border-glass: rgba(169, 196, 214, 0.12);
  --border-active: rgba(217, 162, 139, 0.38);
  --shadow-glow: 0 0 22px rgba(169, 196, 214, 0.10);
  --radius: 18px;
  --nav-h: 64px;
}
[data-theme="light"] {
  --bg-dark: #F1F4F7;
  --bg-surface: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.94);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-glass: rgba(28, 38, 51, 0.03);
  --bg-glass-heavy: rgba(255, 255, 255, 0.92);
  --bg-tag: rgba(58, 80, 104, 0.07);
  --color-primary: #2F4A5F;
  --color-secondary: #B87A62;
  --color-tertiary: #A9C4D6;
  --text-main: #1C2633;
  --text-muted: #4A6582;
  --text-subtle: #6B7F90;
  --border-glass: rgba(47, 74, 95, 0.10);
  --border-active: rgba(184, 122, 98, 0.32);
  --shadow-glow: 0 0 18px rgba(47, 74, 95, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ——— Navbar ——— */
.navbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(16px) saturate(1.2);
  background: var(--bg-glass-heavy);
  border-bottom: 1px solid var(--border-glass);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  height: var(--nav-h); display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.nav-brand { font-family: 'Outfit', sans-serif; font-weight: 800; font-size: 1.6rem; color: var(--text-main); letter-spacing: -0.02em; }
.nav-brand .dot { color: var(--color-secondary); }
.nav-links { display: flex; gap: 18px; font-weight: 600; font-size: 0.95rem; }
.nav-links a { color: var(--text-subtle); }
.nav-links a:hover { color: var(--text-main); text-decoration: none; }
.nav-actions { display: flex; align-items: center; gap: 10px; }

/* Buttons */
.btn {
  font-family: 'Inter', sans-serif; font-weight: 700; font-size: 0.9rem;
  padding: 10px 18px; border-radius: 999px; border: 1px solid transparent;
  cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
  transition: all 0.2s ease; text-decoration: none; white-space: nowrap;
}
.btn-primary { background: var(--color-secondary); color: #fff; border-color: var(--color-secondary); box-shadow: 0 4px 16px rgba(184,122,98,0.22); }
.btn-primary:hover { transform: translateY(-1px); filter: brightness(1.05); text-decoration: none; }
.btn-cv { background: #A9C4D6; color: #131A24; border-color: #A9C4D6; box-shadow: 0 4px 14px rgba(169,196,214,0.22); }
.btn-cv:hover { transform: translateY(-1px); filter: brightness(1.04); text-decoration: none; background: #B8D0DE; }
.btn-github { background: #24292e; color: #fff; border-color: #24292e; box-shadow: 0 4px 14px rgba(36,41,46,0.22); }
.btn-github:hover { transform: translateY(-1px); background: #2f363d; text-decoration: none; }
.btn-linkedin { background: #0A66C2; color: #fff; border-color: #0A66C2; box-shadow: 0 4px 14px rgba(10,102,194,0.22); }
.btn-linkedin:hover { transform: translateY(-1px); background: #0958a8; text-decoration: none; }
.btn-secondary { background: var(--bg-glass); color: var(--text-main); border-color: var(--border-glass); backdrop-filter: blur(8px); }
.btn-secondary:hover { background: var(--bg-card-hover); border-color: var(--border-active); }
.btn-ghost { background: transparent; color: var(--text-muted); border-color: var(--border-glass); }
.btn-ghost:hover { color: var(--text-main); border-color: var(--color-primary); background: var(--bg-tag); text-decoration: none; }
[data-theme="light"] .btn-github { background: #1a1f24; border-color: #1a1f24; }
.btn-icon { width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--border-glass); background: var(--bg-glass); cursor: pointer; font-size: 1.1rem; }
.btn-icon:hover { border-color: var(--color-primary); }

/* HERO */
.hero { max-width: 1200px; margin: 0 auto; padding: 32px 20px 8px; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 32px; align-items: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; font-weight: 500;
  color: var(--text-muted); background: var(--bg-tag); border: 1px solid var(--border-glass);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 14px;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #2ecc71; box-shadow: 0 0 8px rgba(46,204,113,0.6); display: inline-block; }
.badge-loc { margin-left: 6px; color: var(--text-subtle); }
.hero-title { font-family: 'Outfit', sans-serif; font-weight: 800; font-size: clamp(2.6rem, 6vw, 4.2rem); letter-spacing: -0.03em; line-height: 1; }
.hero-title .accent { color: var(--color-primary); }
.hero-role { font-family: 'Outfit', sans-serif; font-weight: 700; color: var(--color-secondary); font-size: 1.05rem; margin-top: 10px; opacity: 0.95; }
.hero-summary { color: var(--text-subtle); margin-top: 12px; font-size: 1.02rem; max-width: 62ch; }
.hero-summary strong { color: var(--text-main); }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-meta { margin-top: 16px; }
.meta-box {
  display: inline-flex; flex-direction: column; gap: 6px;
  padding: 14px 18px; background: var(--bg-card); border: 1px solid var(--border-glass);
  border-radius: 12px; font-family: 'JetBrains Mono', monospace; font-size: 0.94rem;
  color: var(--text-main); backdrop-filter: blur(8px); line-height: 1.45; min-width: 260px;
}
.meta-box a, .meta-box span { display: inline-flex; align-items: center; gap: 6px; }
.meta-box a { color: var(--text-main); font-weight: 600; text-decoration: none; }
.meta-box a:hover { color: var(--color-primary); text-decoration: underline; }
.meta-box span { color: var(--text-subtle); }
.mi { font-size: 0.85rem; opacity: 0.9; width: 18px; text-align: center; display: inline-block; }
.hero-badges { display: none; }
.tag { font-family: 'JetBrains Mono', monospace; font-size: 0.75rem; font-weight: 500; padding: 5px 10px; border-radius: 999px; background: var(--bg-tag); border: 1px solid var(--border-glass); color: var(--text-muted); }

.hero-visual { display: flex; justify-content: center; }
.profile-card { position: relative; width: min(380px, 100%); aspect-ratio: 1; border-radius: 24px; overflow: hidden; background: var(--bg-surface); border: 1px solid var(--border-glass); box-shadow: var(--shadow-glow); }
.profile-card img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 12%; filter: saturate(0.92) contrast(0.98); }
.profile-glow { position: absolute; inset: 0; background: radial-gradient(600px 300px at 70% 18%, rgba(169,196,214,0.10), transparent 62%), radial-gradient(500px 300px at 22% 88%, rgba(217,162,139,0.09), transparent 62%); pointer-events: none; }
.profile-stats { position: absolute; bottom: 10px; left: 10px; right: 10px; display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; }
.profile-stats div { background: var(--bg-glass-heavy); border: 1px solid var(--border-glass); backdrop-filter: blur(10px); border-radius: 14px; padding: 10px 6px; text-align: center; }
.profile-stats strong { display: block; font-family: 'Outfit', sans-serif; font-size: 1.2rem; line-height: 1; color: var(--text-main); }
.profile-stats span { font-size: 0.7rem; color: var(--text-subtle); font-family: 'JetBrains Mono', monospace; }

/* Sections */
.section { max-width: 1200px; margin: 0 auto; padding: 8px 20px 36px; }
.section.alt { background: var(--bg-surface); border-top: 1px solid var(--border-glass); border-bottom: 1px solid var(--border-glass); max-width: none; }
.section.alt .section-head, .section.alt .skills-grid, .section.alt #projectsGrid, .section.alt .filters, .section.alt .toggle-wrap, .section.alt .edu-card { max-width: 1200px; margin-left: auto; margin-right: auto; padding-left: 0; padding-right: 0; }
.section-head h2 { font-family: 'Outfit', sans-serif; font-weight: 800; font-size: 1.9rem; letter-spacing: -0.02em; }
.section-head p { color: var(--text-subtle); margin-top: 4px; }
.skills-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; margin-top: 18px; }
.skill-card { background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius); padding: 16px; backdrop-filter: blur(10px); }
.skill-card h3 { font-family: 'Outfit', sans-serif; font-size: 0.98rem; }
.skill-card p { color: var(--text-subtle); font-size: 0.88rem; margin-top: 6px; line-height: 1.5; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.skill-tags span { font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; padding: 4px 8px; border-radius: 999px; background: var(--bg-tag); border: 1px solid var(--border-glass); color: var(--text-muted); }
.lang-row { display: flex; gap: 18px; margin-top: 14px; font-size: 0.9rem; color: var(--text-subtle); flex-wrap: wrap; }

/* Filters */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.filter-btn { font-family: 'JetBrains Mono', monospace; font-weight: 500; font-size: 0.82rem; padding: 7px 14px; border-radius: 999px; border: 1px solid var(--border-glass); background: var(--bg-glass); color: var(--text-subtle); cursor: pointer; }
.filter-btn.active, .filter-btn:hover { background: var(--color-primary); color: var(--bg-dark); border-color: var(--color-primary); }

/* Projects grid */
.projects-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; margin-top: 18px; }
.project-card {
  background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s; backdrop-filter: blur(10px);
}
.project-card:hover { transform: translateY(-4px); border-color: var(--border-active); box-shadow: var(--shadow-glow); }
.card-media { height: 150px; background: linear-gradient(135deg, var(--color-tertiary), var(--color-primary)); position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; }
.card-media span { font-family: 'Outfit', sans-serif; font-weight: 800; font-size: 1.9rem; color: rgba(255,255,255,0.95); letter-spacing: -0.02em; text-shadow: 0 2px 18px rgba(0,0,0,0.25); }
.card-media .media-badge { position: absolute; top: 10px; left: 10px; font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; padding: 4px 8px; border-radius: 999px; background: rgba(0,0,0,0.35); color: #fff; border: 1px solid rgba(255,255,255,0.2); backdrop-filter: blur(6px); }
.card-body { padding: 14px 14px 12px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card-body h3 { font-family: 'Outfit', sans-serif; font-size: 1.05rem; line-height: 1.2; }
.card-body .tagline { color: var(--color-secondary); font-weight: 700; font-size: 0.82rem; }
.card-body .summary { color: var(--text-subtle); font-size: 0.86rem; line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.card-badges span { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; padding: 4px 7px; border-radius: 999px; background: var(--bg-tag); border: 1px solid var(--border-glass); color: var(--text-muted); }
.card-actions { display: flex; gap: 8px; margin-top: auto; padding-top: 6px; }
.card-actions .btn { flex: 1; justify-content: center; padding: 8px 10px; font-size: 0.82rem; }

.toggle-wrap { display: flex; justify-content: center; margin-top: 16px; }

/* OSS */
.oss-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin-top: 16px; }
.oss-card { background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius); padding: 16px; display: flex; flex-direction: column; gap: 8px; backdrop-filter: blur(8px); }
.oss-card h3 { font-family: 'JetBrains Mono', monospace; font-size: 0.92rem; }
.oss-card h3 a { color: var(--text-main); }
.oss-card .meta { font-size: 0.8rem; color: var(--text-subtle); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.badge-merged { background: rgba(46,204,113,0.14); color: #2ecc71; border: 1px solid rgba(46,204,113,0.3); padding: 2px 8px; border-radius: 999px; font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; font-weight: 700; }
.badge-open { background: rgba(241,196,15,0.14); color: #f1c40f; border: 1px solid rgba(241,196,15,0.3); padding: 2px 8px; border-radius: 999px; font-family: 'JetBrains Mono', monospace; font-size: 0.7rem; font-weight: 700; }
.oss-card p { color: var(--text-subtle); font-size: 0.86rem; line-height: 1.5; }
.oss-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.oss-note { margin-top: 12px; color: var(--text-subtle); font-size: 0.85rem; }

/* Edu */
.edu-card { background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius); padding: 18px; display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 14px; backdrop-filter: blur(8px); }
.edu-card h3 { font-family: 'Outfit', sans-serif; font-size: 1rem; }
.edu-card p { color: var(--text-subtle); font-size: 0.9rem; }

/* Contact */
.contact-form { max-width: 640px; margin-top: 16px; background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius); padding: 20px; backdrop-filter: blur(8px); display: grid; gap: 14px; }
.form-row { display: grid; gap: 6px; }
.form-row label { font-weight: 700; font-size: 0.85rem; color: var(--text-main); }
.form-row input, .form-row textarea {
  width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border-glass);
  background: var(--bg-glass); color: var(--text-main); font-family: inherit; font-size: 0.95rem; outline: none;
}
.form-row input:focus, .form-row textarea:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--bg-tag); }
.form-status-msg { font-size: 0.9rem; min-height: 1.2em; }
.form-status-msg.success { color: #2ecc71; }
.form-status-msg.error { color: var(--color-secondary); }
.form-fallback { font-size: 0.85rem; color: var(--text-subtle); }

/* Footer */
.footer { border-top: 1px solid var(--border-glass); padding: 18px 20px; color: var(--text-subtle); font-size: 0.85rem; background: var(--bg-surface); }
.footer-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* Modal */
.modal { position: fixed; inset: 0; display: none; z-index: 50; }
.modal.open { display: block; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.55); backdrop-filter: blur(6px); }
.modal-card { position: relative; max-width: 820px; margin: 4vh auto; max-height: 92vh; overflow: auto; background: var(--bg-glass-heavy); border: 1px solid var(--border-glass); border-radius: 20px; box-shadow: 0 20px 60px rgba(0,0,0,0.4); padding: 22px; backdrop-filter: blur(16px); }
.modal-close { position: absolute; top: 12px; right: 12px; width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border-glass); background: var(--bg-glass); cursor: pointer; color: var(--text-main); }
.modal-card h2 { font-family: 'Outfit', sans-serif; font-size: 1.5rem; }
.modal-tagline { color: var(--color-secondary); font-weight: 700; margin-top: 2px; }
.modal-section { margin-top: 16px; }
.modal-section h3 { font-family: 'Outfit', sans-serif; font-size: 1rem; margin-bottom: 6px; }
.modal-section p, .modal-section li { color: var(--text-subtle); font-size: 0.92rem; line-height: 1.6; }
.modal-section ul { padding-left: 18px; }
.modal-actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

/* Responsive */
@media (max-width: 1000px) {
  .skills-grid { grid-template-columns: repeat(2,1fr); }
  .projects-grid { grid-template-columns: repeat(2,1fr); }
  .oss-grid { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .nav-links { display: none; }
}
@media (max-width: 640px) {
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .profile-card { max-width: 320px; }
  .hide-mobile { display: none; }
}