/* ============================================================
   Leonardo Rodríguez Mantilla — Portfolio
   Vibe: "Engineer Dark" — negro azulado, azul eléctrico/cyan
   Fondo vivo de partículas (canvas). Masculino · tech · sobrio
   ============================================================ */

:root {
  --bg: #05070d;
  --bg-2: #0a0e18;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --panel: #0c111d;
  --hair: rgba(255, 255, 255, 0.09);
  --hair-2: rgba(255, 255, 255, 0.17);
  --inset-hi: inset 0 1px 0 rgba(255, 255, 255, 0.06);

  --ink: #eaf1fb;
  --muted: #98a5bb;
  --dim: #5e6b81;

  --accent: #2e9bff;
  --accent-2: #22d3ee;
  --grad: linear-gradient(118deg, #22d3ee 0%, #2e9bff 58%, #4f7cff 100%);

  /* cool category palette */
  --v1: #2e9bff; --v2: #22d3ee; --v3: #38bdf8; --v4: #2dd4bf; --v5: #34d399; --v6: #6e8bff; --v7: #0ea5e9;

  --r-lg: 26px; --r-md: 20px; --r-sm: 13px;
  --shadow: 0 30px 70px -30px rgba(0, 0, 0, 0.85);
  --glow: 0 0 40px -12px color-mix(in srgb, var(--cat, #2e9bff) 70%, transparent);

  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --maxw: 1140px;
  --font-display: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  --font-body: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --cat: #2e9bff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 120px; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font-body); background: var(--bg); color: var(--ink); line-height: 1.65; letter-spacing: -0.01em; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: hidden; }

/* Live particle canvas (Wallpaper-Engine style) */
#bg-canvas { position: fixed; inset: 0; z-index: -3; display: block; pointer-events: none; }
/* subtle depth glow over the canvas */
.bg-mesh { position: fixed; inset: 0; z-index: -2; pointer-events: none; background:
  radial-gradient(50% 40% at 12% 0%, rgba(46, 155, 255, 0.12), transparent 60%),
  radial-gradient(45% 38% at 92% 6%, rgba(34, 211, 238, 0.10), transparent 60%),
  radial-gradient(60% 50% at 50% 110%, rgba(79, 124, 255, 0.10), transparent 60%); }
.bg-grid, .bg-grain { display: none; }

::selection { background: rgba(46, 155, 255, 0.34); color: #fff; }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #05070d; }
::-webkit-scrollbar-thumb { background: #1b2536; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #283751; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 max(26px, env(safe-area-inset-left)) 0 max(26px, env(safe-area-inset-right)); }

/* ============================ NAV ============================ */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; justify-content: center; padding: max(18px, calc(env(safe-area-inset-top) + 10px)) max(16px, env(safe-area-inset-right)) 18px max(16px, env(safe-area-inset-left)); transition: padding .5s var(--ease); }
.nav.scrolled { padding-top: max(11px, calc(env(safe-area-inset-top) + 6px)); }
.brand { position: relative; z-index: 2; }
.nav-inner { display: flex; align-items: center; gap: 10px; width: 100%; max-width: var(--maxw); padding: 9px 9px 9px 18px; background: rgba(10, 14, 24, 0.7); backdrop-filter: blur(18px) saturate(1.3); -webkit-backdrop-filter: blur(18px) saturate(1.3); border: 1px solid var(--hair); border-radius: 999px; box-shadow: var(--shadow), var(--inset-hi); transition: border-color .4s var(--ease), background .4s var(--ease); }
.nav.scrolled .nav-inner { background: rgba(8, 11, 20, 0.88); border-color: var(--hair-2); }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 600; font-size: 15px; letter-spacing: -0.2px; margin-right: auto; white-space: nowrap; }
.brand .mono { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 11px; background: var(--grad); color: #04121f; font-weight: 700; font-size: 14px; box-shadow: 0 0 26px -6px rgba(46, 155, 255, 0.7); }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a { padding: 8px 15px; border-radius: 999px; font-size: 14px; font-weight: 500; color: var(--muted); transition: color .3s var(--ease), background .3s var(--ease); }
.nav-links a:hover { color: var(--ink); background: rgba(255, 255, 255, 0.06); }
.lang-toggle { display: inline-flex; padding: 3px; gap: 2px; border: 1px solid var(--hair); border-radius: 999px; margin-left: 6px; background: rgba(0, 0, 0, 0.3); }
.lang-toggle button { border: none; background: transparent; color: var(--dim); font: 700 12px/1 var(--font-body); padding: 7px 11px; cursor: pointer; border-radius: 999px; transition: .3s var(--ease); }
.lang-toggle button.active { background: var(--grad); color: #04121f; }
.nav-burger { display: none; position: relative; width: 42px; height: 42px; border-radius: 999px; background: rgba(255, 255, 255, 0.05); border: 1px solid var(--hair); cursor: pointer; flex-shrink: 0; }
.nav-burger span { position: absolute; left: 11px; width: 20px; height: 2px; border-radius: 2px; background: var(--ink); transition: transform .5s var(--ease), opacity .3s var(--ease); }
.nav-burger span:nth-child(1) { top: 15px; } .nav-burger span:nth-child(2) { bottom: 15px; }
.nav-burger.active span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-burger.active span:nth-child(2) { bottom: 19px; transform: rotate(-45deg); }

/* ============================ BUTTONS ============================ */
.btn { display: inline-flex; align-items: center; gap: 11px; padding: 14px 16px 14px 24px; border-radius: 999px; font-weight: 700; font-size: 15px; cursor: pointer; border: 1px solid transparent; transition: transform .4s var(--ease), box-shadow .4s var(--ease), background .35s var(--ease), border-color .35s var(--ease), color .35s var(--ease); letter-spacing: -0.01em; }
.btn .ico-pill { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 999px; flex-shrink: 0; transition: transform .4s var(--ease); }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--grad); color: #04121f; box-shadow: 0 0 44px -12px rgba(46, 155, 255, 0.7), var(--inset-hi); }
.btn-primary .ico-pill { background: rgba(0, 0, 0, 0.18); color: #04121f; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 60px -10px rgba(34, 211, 238, 0.8); }
.btn-primary:hover .ico-pill { transform: translate(2px, -2px) scale(1.06); }
.btn-ghost { background: rgba(255, 255, 255, 0.04); border-color: var(--hair); color: var(--ink); padding-right: 16px; box-shadow: var(--inset-hi); }
.btn-ghost .ico-pill { background: rgba(46, 155, 255, 0.14); color: var(--accent); }
.btn-ghost:hover { transform: translateY(-3px); border-color: var(--accent); color: var(--accent); }
.btn-ghost:hover .ico-pill { transform: translate(2px, -2px) scale(1.06); }

/* ============================ HERO ============================ */
.hero { position: relative; padding: 185px 0 96px; }
.hero-inner { display: grid; grid-template-columns: 1.45fr 1fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; padding: 8px 16px; border-radius: 999px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.18em; color: var(--accent-2); background: rgba(34, 211, 238, 0.07); border: 1px solid rgba(34, 211, 238, 0.22); box-shadow: var(--inset-hi); }
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 10px var(--accent-2); animation: pulse 2.2s var(--ease) infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .35; transform: scale(.75); } }
.hero h1 { font-family: var(--font-display); font-weight: 700; font-size: clamp(2.7rem, 6.2vw, 4.8rem); line-height: 1.0; letter-spacing: -0.04em; margin: 24px 0 18px; }
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .role { font-family: var(--font-display); font-size: clamp(1.05rem, 2.1vw, 1.42rem); color: var(--ink); font-weight: 500; margin-bottom: 20px; letter-spacing: -0.02em; }
.hero .role .sep { color: var(--accent); margin: 0 9px; font-weight: 700; }
.hero p.lead { color: var(--muted); font-size: 1.07rem; max-width: 540px; margin-bottom: 34px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }

/* Hero card */
.hero-card { position: relative; }
.bezel { background: var(--surface); border: 1px solid var(--hair); border-radius: var(--r-lg); padding: 7px; box-shadow: var(--shadow); }
.bezel-core { position: relative; overflow: hidden; border-radius: calc(var(--r-lg) - 7px); padding: 30px; background: linear-gradient(165deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.012)); border: 1px solid var(--hair); box-shadow: var(--inset-hi); }
.bezel-core::after { content: ""; position: absolute; top: -40%; right: -30%; width: 70%; height: 80%; background: radial-gradient(circle, rgba(46, 155, 255, 0.18), transparent 70%); pointer-events: none; }
.hero-card h3 { font-family: var(--font-display); font-size: 12px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--dim); margin-bottom: 22px; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; position: relative; }
.stat .num { font-family: var(--font-display); font-size: 2rem; font-weight: 700; letter-spacing: -0.03em; line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .lab { font-size: 12.5px; color: var(--muted); margin-top: 8px; line-height: 1.4; }

/* ============================ SECTIONS ============================ */
section { padding: 100px 0; position: relative; }
.section-head { margin-bottom: 52px; max-width: 720px; }
.section-head .kicker { display: inline-flex; align-items: center; padding: 7px 15px; border-radius: 999px; margin-bottom: 16px; font-family: var(--font-body); font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase; font-weight: 700; color: var(--accent-2); background: rgba(34, 211, 238, 0.07); border: 1px solid rgba(34, 211, 238, 0.2); }
.section-head h2 { font-family: var(--font-display); font-size: clamp(2rem, 4.4vw, 3.2rem); font-weight: 700; letter-spacing: -0.035em; line-height: 1.04; }
.section-head p { color: var(--muted); margin-top: 14px; font-size: 1.05rem; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 44px; align-items: start; }
.about-text p { color: var(--muted); margin-bottom: 18px; font-size: 1.08rem; line-height: 1.75; }
.about-text strong { color: var(--ink); font-weight: 600; }
.facts { display: flex; flex-direction: column; gap: 12px; }
.fact { display: flex; gap: 15px; align-items: center; padding: 17px 19px; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--r-sm); box-shadow: var(--inset-hi); transition: transform .4s var(--ease), border-color .4s var(--ease); }
.fact:hover { transform: translateX(4px); border-color: var(--hair-2); }
.fact:nth-child(1) { --cat: var(--v1); } .fact:nth-child(2) { --cat: var(--v2); } .fact:nth-child(3) { --cat: var(--v4); } .fact:nth-child(4) { --cat: var(--v5); }
.fact .ic { width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center; background: color-mix(in srgb, var(--cat) 16%, transparent); color: var(--cat); flex-shrink: 0; box-shadow: var(--inset-hi); }
.fact .k { font-size: 11px; color: var(--dim); text-transform: uppercase; letter-spacing: 0.07em; }
.fact .v { font-weight: 600; font-size: 14.5px; margin-top: 2px; }

/* ============================ TIMELINE ============================ */
.timeline { position: relative; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(180deg, var(--accent-2), var(--accent) 60%, transparent); }
.tl-item { position: relative; margin-bottom: 22px; }
.tl-item::before { content: ""; position: absolute; left: -33px; top: 26px; width: 15px; height: 15px; border-radius: 50%; background: var(--bg); border: 3px solid var(--accent); box-shadow: 0 0 0 5px rgba(46, 155, 255, 0.12), 0 0 14px rgba(46, 155, 255, 0.6); }
.tl-card { background: var(--surface); border: 1px solid var(--hair); border-radius: var(--r-md); padding: 26px 28px; box-shadow: var(--inset-hi); transition: transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease); }
.tl-card:hover { transform: translateX(6px); border-color: var(--hair-2); box-shadow: var(--shadow), var(--inset-hi); }
.tl-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; align-items: baseline; margin-bottom: 5px; }
.tl-title { font-family: var(--font-display); font-size: 1.22rem; font-weight: 600; letter-spacing: -0.02em; }
.tl-period { font-size: 12.5px; color: #04121f; font-weight: 700; white-space: nowrap; padding: 5px 12px; border-radius: 999px; background: var(--grad); }
.tl-company { color: var(--muted); font-weight: 500; font-size: 14.5px; }
.tl-meta { font-size: 13px; color: var(--dim); margin-top: 9px; line-height: 1.7; }
.tl-meta b { color: var(--muted); font-weight: 600; }
.tl-bullets { list-style: none; margin-top: 16px; display: flex; flex-direction: column; gap: 10px; }
.tl-bullets li { position: relative; padding-left: 22px; font-size: 14.5px; color: var(--muted); }
.tl-bullets li::before { content: ""; position: absolute; left: 2px; top: 8px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.tl-bullets li b { color: var(--ink); font-weight: 600; }

/* ============================ SKILLS ============================ */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.skill-cat:nth-child(7n+1) { --cat: var(--v1); } .skill-cat:nth-child(7n+2) { --cat: var(--v2); } .skill-cat:nth-child(7n+3) { --cat: var(--v3); }
.skill-cat:nth-child(7n+4) { --cat: var(--v4); } .skill-cat:nth-child(7n+5) { --cat: var(--v5); } .skill-cat:nth-child(7n+6) { --cat: var(--v6); } .skill-cat:nth-child(7n+7) { --cat: var(--v7); }
.skill-cat { border-radius: var(--r-lg); padding: 7px; background: color-mix(in srgb, var(--cat) 9%, var(--surface)); border: 1px solid color-mix(in srgb, var(--cat) 24%, transparent); box-shadow: var(--shadow); transition: transform .45s var(--ease), box-shadow .45s var(--ease); }
.skill-cat:hover { transform: translateY(-5px); box-shadow: var(--glow); }
.skill-cat-core { background: var(--panel); border-radius: calc(var(--r-lg) - 7px); padding: 26px; box-shadow: var(--inset-hi); }
.skill-cat-head { display: flex; align-items: center; gap: 13px; margin-bottom: 20px; }
.skill-cat-head .ic { width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center; background: color-mix(in srgb, var(--cat) 20%, transparent); color: var(--cat); flex-shrink: 0; box-shadow: 0 0 22px -8px var(--cat), var(--inset-hi); }
.skill-cat-head h3 { font-family: var(--font-display); font-size: 1.1rem; font-weight: 600; letter-spacing: -0.02em; }
.skill-cat-head .count { margin-left: auto; font-size: 12px; font-weight: 700; color: var(--cat); background: color-mix(in srgb, var(--cat) 16%, transparent); padding: 4px 11px; border-radius: 999px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 999px; font-size: 13px; font-weight: 500; background: rgba(255, 255, 255, 0.04); border: 1px solid var(--hair); color: var(--ink); transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease); cursor: default; }
.chip:hover { transform: translateY(-2px); border-color: var(--cat); background: color-mix(in srgb, var(--cat) 12%, transparent); }
.chip .lvl { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.lvl-adv { background: var(--cat); box-shadow: 0 0 8px var(--cat); } .lvl-int { background: color-mix(in srgb, var(--cat) 55%, #2a3346); } .lvl-bas { background: #41506a; }
.skill-legend { display: flex; gap: 22px; flex-wrap: wrap; margin-top: 34px; font-size: 12.5px; color: var(--dim); justify-content: center; }
.skill-legend span { display: inline-flex; align-items: center; gap: 8px; }
.skill-legend .lvl { width: 8px; height: 8px; border-radius: 50%; }
.skill-legend .lvl-adv { background: var(--accent); } .skill-legend .lvl-int { background: var(--accent-2); } .skill-legend .lvl-bas { background: var(--dim); }

/* ============================ EDUCATION ============================ */
.edu-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.edu-card:nth-child(6n+1) { --cat: var(--v1); } .edu-card:nth-child(6n+2) { --cat: var(--v2); } .edu-card:nth-child(6n+3) { --cat: var(--v3); }
.edu-card:nth-child(6n+4) { --cat: var(--v4); } .edu-card:nth-child(6n+5) { --cat: var(--v5); } .edu-card:nth-child(6n+6) { --cat: var(--v6); }
.edu-card { position: relative; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--r-md); padding: 24px; box-shadow: var(--inset-hi); transition: transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease); overflow: hidden; }
.edu-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--cat); }
.edu-card:hover { transform: translateY(-5px); border-color: var(--hair-2); box-shadow: var(--glow); }
.edu-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.edu-emblem { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: rgba(255, 255, 255, 0.06); border: 1px solid var(--hair); flex-shrink: 0; }
.edu-emblem.ic { color: var(--cat); background: color-mix(in srgb, var(--cat) 16%, transparent); }
.edu-emblem .edu-logo { width: 24px; height: 24px; object-fit: contain; }
/* color/brand logos read best on a light chip */
.edu-emblem--light { background: #fff; border-color: rgba(255, 255, 255, 0.22); box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25); }
.edu-emblem--light .edu-logo { width: 34px; height: 34px; }
.edu-card .inst { font-family: var(--font-display); color: var(--cat); font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; line-height: 1.3; }
.edu-card .deg { font-weight: 600; font-size: 1.05rem; margin: 0 0 7px; letter-spacing: -0.01em; line-height: 1.35; }
.edu-card .when { font-size: 12.5px; color: var(--dim); }
.edu-card .note { font-size: 13px; color: var(--muted); margin-top: 13px; padding-top: 13px; border-top: 1px solid var(--hair); line-height: 1.6; }
.courses { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.course-pill { font-size: 13px; padding: 10px 16px; border-radius: 999px; background: var(--surface); border: 1px solid var(--hair); color: var(--muted); transition: .3s var(--ease); }
.course-pill:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

/* ============================ CONTACT ============================ */
.contact-wrap { border-radius: calc(var(--r-lg) + 6px); padding: 7px; background: var(--surface); border: 1px solid var(--hair); box-shadow: var(--shadow); }
.contact-core { border-radius: var(--r-lg); padding: 64px 48px; text-align: center; position: relative; overflow: hidden; background: linear-gradient(150deg, rgba(34, 211, 238, 0.12), rgba(46, 155, 255, 0.08) 50%, rgba(79, 124, 255, 0.1)), var(--panel); border: 1px solid var(--hair); box-shadow: var(--inset-hi); }
.contact-core::before { content: ""; position: absolute; top: -60%; left: 50%; transform: translateX(-50%); width: 640px; height: 360px; background: radial-gradient(circle, rgba(46, 155, 255, 0.2), transparent 70%); pointer-events: none; }
.contact-core h2 { font-family: var(--font-display); font-size: clamp(1.9rem, 3.6vw, 2.9rem); margin-bottom: 14px; position: relative; letter-spacing: -0.035em; }
.contact-core p { color: var(--muted); margin: 0 auto 32px; max-width: 480px; position: relative; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; position: relative; }

/* ============================ FOOTER ============================ */
footer { padding: 54px 0 46px; border-top: 1px solid var(--hair); text-align: center; color: var(--dim); font-size: 13.5px; }
footer .brand { justify-content: center; margin: 0 0 14px; color: var(--ink); }

/* ============================ MARQUEE ============================ */
.marquee-section { padding: 28px 0 8px; overflow: hidden; }
.marquee-label { text-align: center; font-size: 10.5px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--dim); margin-bottom: 22px; font-weight: 700; }
.marquee { position: relative; width: 100%; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.marquee-track { display: inline-flex; gap: 14px; padding: 6px 7px; white-space: nowrap; animation: scroll-x 50s linear infinite; will-change: transform; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes scroll-x { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.logo-pill { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; padding: 11px 20px; border-radius: 999px; background: var(--surface); border: 1px solid var(--hair); box-shadow: var(--inset-hi); transition: transform .35s var(--ease), border-color .35s var(--ease), background .35s var(--ease); }
.logo-pill:hover { transform: translateY(-3px); border-color: var(--hair-2); background: var(--surface-2); }
.logo-pill > span { font-size: 14px; font-weight: 600; color: var(--muted); letter-spacing: -0.01em; }
.logo-pill:hover > span { color: var(--ink); }
.si-logo { width: 22px; height: 22px; object-fit: contain; }

/* logos inside chips */
.chip .chip-logo { display: inline-grid; place-items: center; }
.chip .chip-logo .si-logo { width: 15px; height: 15px; }

/* ============================ PORTFOLIO ============================ */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.pj-card:nth-child(6n+1) { --cat: var(--v1); } .pj-card:nth-child(6n+2) { --cat: var(--v2); } .pj-card:nth-child(6n+3) { --cat: var(--v4); }
.pj-card:nth-child(6n+4) { --cat: var(--v5); } .pj-card:nth-child(6n+5) { --cat: var(--v3); } .pj-card:nth-child(6n+6) { --cat: var(--v6); }
.pj-card { position: relative; overflow: hidden; background: var(--surface); border: 1px solid var(--hair); border-radius: var(--r-md); padding: 26px; box-shadow: var(--inset-hi); transition: transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease); }
.pj-card::before { content: ""; position: absolute; left: 0; top: 0; right: 0; height: 3px; background: var(--cat); opacity: .85; }
.pj-card:hover { transform: translateY(-5px); border-color: var(--hair-2); box-shadow: var(--glow); }
.pj-head { display: flex; align-items: center; gap: 13px; margin-bottom: 16px; }
.pj-emblem { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; background: color-mix(in srgb, var(--cat) 18%, transparent); color: var(--cat); flex-shrink: 0; box-shadow: 0 0 22px -8px var(--cat), var(--inset-hi); }
.pj-emblem .pj-logo { width: 26px; height: 26px; object-fit: contain; }
.pj-cat { font-family: var(--font-display); font-size: 11px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cat); }
.pj-title { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 10px; }
.pj-desc { color: var(--muted); font-size: 14.5px; line-height: 1.65; margin-bottom: 18px; }
.pj-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.pj-tag { display: inline-flex; align-items: center; gap: 6px; padding: 6px 11px; border-radius: 999px; font-size: 12px; font-weight: 600; background: rgba(255, 255, 255, 0.04); border: 1px solid var(--hair); color: var(--muted); }
.pj-tag-logo { display: inline-grid; place-items: center; }
.pj-tag-logo .si-logo { width: 13px; height: 13px; }
/* featured project (spans full width) */
.pj-card.featured { grid-column: 1 / -1; }
.pj-card.featured .pj-emblem { width: 52px; height: 52px; border-radius: 15px; }
.pj-card.featured .pj-emblem .pj-logo { width: 30px; height: 30px; }
.pj-card.featured .pj-title { font-size: 1.55rem; }
.pj-highlights { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 26px; margin: 6px 0 18px; }
.pj-highlights li { position: relative; padding-left: 20px; font-size: 14px; color: var(--muted); line-height: 1.55; }
.pj-highlights li::before { content: ""; position: absolute; left: 2px; top: 8px; width: 7px; height: 7px; border-radius: 50%; background: var(--cat); box-shadow: 0 0 8px var(--cat); }
.pj-highlights li b { color: var(--ink); font-weight: 600; }

/* ============================ SCROLL PROGRESS + SPOTLIGHT ============================ */
.scroll-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 200; background: var(--grad); transform: scaleX(0); transform-origin: 0 50%; box-shadow: 0 0 14px rgba(46, 155, 255, 0.7); will-change: transform; }
.bg-spot { display: none; }
.spot::after { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0; background: radial-gradient(240px circle at var(--mx, 50%) var(--my, 50%), color-mix(in srgb, var(--cat, #2e9bff) 16%, transparent), transparent 66%); transition: opacity .45s var(--ease); }
.spot:hover::after { opacity: 1; }

/* ============================ REVEAL ============================ */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .8s var(--ease-soft), transform .8s var(--ease-soft); will-change: transform, opacity; }
.reveal.visible { opacity: 1; transform: none; will-change: auto; }
.reveal[data-delay="1"] { transition-delay: .08s; } .reveal[data-delay="2"] { transition-delay: .16s; } .reveal[data-delay="3"] { transition-delay: .24s; }

/* ============================ RESPONSIVE ============================ */
@media (max-width: 920px) {
  .hero-inner, .about-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 140px; }
  .hero-card { order: 0; max-width: none; }
  .skills-grid, .edu-grid, .projects-grid { grid-template-columns: 1fr; }
  .pj-highlights { grid-template-columns: 1fr; }
  .brand span:not(.mono) { display: none; }
  /* drop backdrop-filter on mobile so the fixed menu anchors to the viewport, not the pill */
  .nav-inner { backdrop-filter: none; -webkit-backdrop-filter: none; background: rgba(8, 11, 20, 0.94); }
  .nav-links { position: fixed; inset: 0; z-index: 1; flex-direction: column; justify-content: center; align-items: center; gap: 6px; background: rgba(5, 7, 13, 0.95); backdrop-filter: blur(26px); -webkit-backdrop-filter: blur(26px); padding-top: env(safe-area-inset-top); opacity: 0; pointer-events: none; transition: opacity .5s var(--ease); }
  .nav-links.open { opacity: 1; pointer-events: auto; }
  .nav-links a { font-family: var(--font-display); font-size: 1.7rem; padding: 12px 24px; opacity: 0; transform: translateY(26px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
  .nav-links.open a { opacity: 1; transform: none; }
  .nav-links.open a:nth-child(1) { transition-delay: .08s; } .nav-links.open a:nth-child(2) { transition-delay: .14s; } .nav-links.open a:nth-child(3) { transition-delay: .2s; } .nav-links.open a:nth-child(4) { transition-delay: .26s; } .nav-links.open a:nth-child(5) { transition-delay: .32s; } .nav-links.open a:nth-child(6) { transition-delay: .38s; }
  .nav-links .lang-toggle { margin: 18px 0 0; transform: scale(1.15); }
  .nav-burger { display: block; z-index: 2; }
}
@media (max-width: 560px) {
  .container { padding: 0 18px; }
  section { padding: 72px 0; }
  .contact-core { padding: 46px 22px; }
  .hero { padding-top: 128px; }
  .btn { width: 100%; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}