/* =========================================================
   Sai Charan Venkata Chenna — portfolio styles
   ========================================================= */

:root {
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 20px;
  --radius-sm: 12px;
  --max: 1180px;
  --ease: cubic-bezier(.2, .8, .2, 1);

  --accent-1: #6366f1;
  --accent-2: #06b6d4;
  --accent-3: #a855f7;
  --grad: linear-gradient(120deg, var(--accent-1), var(--accent-3) 50%, var(--accent-2));
  --green: #22c55e;
}

/* Dark (default) */
:root,
:root[data-theme="dark"] {
  --bg: #070b1a;
  --bg-alt: #0b1124;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: #10172e;
  --border: rgba(148, 163, 184, 0.14);
  --border-strong: rgba(148, 163, 184, 0.28);
  --text: #e8ecf8;
  --text-soft: #b6bfd6;
  --muted: #8591ad;
  --tag-bg: rgba(99, 102, 241, 0.12);
  --tag-text: #c7d0ff;
  --nav-bg: rgba(7, 11, 26, 0.72);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --orb-opacity: 0.55;
  --code-bg: #0d1430;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f7f8fc;
  --bg-alt: #eef1f9;
  --surface: rgba(255, 255, 255, 0.8);
  --surface-strong: #ffffff;
  --border: rgba(15, 23, 42, 0.08);
  --border-strong: rgba(15, 23, 42, 0.16);
  --text: #0b1224;
  --text-soft: #334155;
  --muted: #64748b;
  --tag-bg: rgba(99, 102, 241, 0.09);
  --tag-text: #4338ca;
  --nav-bg: rgba(247, 248, 252, 0.78);
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.1);
  --orb-opacity: 0.28;
  --code-bg: #0f172a;
  color-scheme: light;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .35s var(--ease), color .35s var(--ease);
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
svg { width: 1.1em; height: 1.1em; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
strong { color: var(--text); font-weight: 600; }
::selection { background: rgba(99, 102, 241, .35); }
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; border-radius: 6px; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; left: 16px; top: -60px; z-index: 200; background: var(--accent-1); color: #fff; padding: 10px 16px; border-radius: 10px; }
.skip-link:focus { top: 12px; }

.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Background orbs */
.bg-orbs { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.bg-orbs span { position: absolute; border-radius: 50%; filter: blur(90px); opacity: var(--orb-opacity); animation: float 22s ease-in-out infinite; }
.bg-orbs span:nth-child(1) { width: 520px; height: 520px; background: #4f46e5; top: -160px; left: -140px; }
.bg-orbs span:nth-child(2) { width: 460px; height: 460px; background: #0891b2; top: 30%; right: -180px; animation-delay: -7s; }
.bg-orbs span:nth-child(3) { width: 380px; height: 380px; background: #9333ea; bottom: -160px; left: 30%; animation-delay: -14s; opacity: calc(var(--orb-opacity) * .6); }
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 70%);
  opacity: .5;
}
@keyframes float { 0%, 100% { transform: translate(0, 0) scale(1); } 50% { transform: translate(40px, 30px) scale(1.08); } }

.scroll-progress { position: fixed; top: 0; left: 0; height: 3px; width: 100%; transform-origin: 0 50%; transform: scaleX(0); background: var(--grad); z-index: 120; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 13px 22px; border-radius: 999px; font-weight: 600; font-size: .95rem;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s, border-color .25s;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); background-size: 200% 100%; color: #fff; box-shadow: 0 10px 30px rgba(99, 102, 241, .35); }
.btn-primary:hover { transform: translateY(-2px); background-position: 100% 0; box-shadow: 0 16px 40px rgba(99, 102, 241, .45); }
.btn-ghost { border: 1px solid var(--border-strong); background: var(--surface); backdrop-filter: blur(10px); }
.btn-ghost:hover { transform: translateY(-2px); border-color: var(--accent-1); }
.btn-sm { padding: 9px 18px; font-size: .88rem; }
.btn-lg { padding: 16px 28px; font-size: 1rem; }

.icon-btn { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; border: 1px solid var(--border); background: var(--surface); transition: border-color .2s, transform .2s; }
.icon-btn:hover { border-color: var(--accent-1); transform: translateY(-1px); }
.icon-btn svg { width: 20px; height: 20px; }
[data-theme="dark"] .icon-moon, [data-theme="light"] .icon-sun { display: none; }

/* ---------- Nav ---------- */
.nav { position: fixed; inset: 0 0 auto 0; z-index: 100; transition: background .3s, border-color .3s, box-shadow .3s; border-bottom: 1px solid transparent; }
.nav.scrolled { background: var(--nav-bg); backdrop-filter: blur(16px) saturate(160%); -webkit-backdrop-filter: blur(16px) saturate(160%); border-bottom-color: var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 20px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.1rem; letter-spacing: -.02em; }
.brand-mark { width: 36px; height: 36px; border-radius: 11px; display: grid; place-items: center; background: var(--grad); color: #fff; font-size: .82rem; letter-spacing: 0; }
.brand .dot { color: var(--accent-2); }
.nav-links { list-style: none; display: flex; gap: 4px; }
.nav-links a { display: block; padding: 8px 14px; border-radius: 999px; color: var(--text-soft); font-size: .92rem; font-weight: 500; transition: color .2s, background .2s; }
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); background: var(--surface); box-shadow: inset 0 0 0 1px var(--border); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.menu-btn { display: none; }

/* ---------- Hero ---------- */
.hero { padding: 150px 0 60px; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.pill { display: inline-flex; align-items: center; gap: 10px; padding: 7px 16px 7px 12px; border-radius: 999px; border: 1px solid var(--border-strong); background: var(--surface); font-size: .86rem; font-weight: 500; color: var(--text-soft); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0 rgba(34, 197, 94, .6); animation: pulse 2s infinite; flex-shrink: 0; }
@keyframes pulse { 70% { box-shadow: 0 0 0 10px rgba(34, 197, 94, 0); } 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); } }

h1 { font-size: clamp(2.4rem, 5.4vw, 4.2rem); line-height: 1.08; letter-spacing: -.035em; font-weight: 800; margin: 24px 0 22px; }
.typed { color: var(--text-soft); }
.caret { display: inline-block; width: 3px; height: .9em; margin-left: 4px; background: var(--accent-2); vertical-align: -0.08em; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.lead { font-size: 1.14rem; color: var(--text-soft); max-width: 600px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 28px; }
.meta-link { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: .92rem; transition: color .2s; }
.meta-link:hover { color: var(--text); }

.hero-visual { position: relative; display: flex; flex-direction: column; align-items: center; }
.portrait { position: relative; width: min(380px, 100%); aspect-ratio: 1; }
.portrait-ring { position: absolute; inset: -10px; border-radius: 36% 64% 58% 42% / 44% 40% 60% 56%; background: var(--grad); animation: morph 14s ease-in-out infinite, spin 30s linear infinite; filter: blur(.5px); }
.portrait picture, .portrait img { position: relative; width: 100%; height: 100%; object-fit: cover; border-radius: 36% 64% 58% 42% / 44% 40% 60% 56%; animation: morph 14s ease-in-out infinite; }
.portrait picture { display: block; }
@keyframes morph {
  0%, 100% { border-radius: 36% 64% 58% 42% / 44% 40% 60% 56%; }
  50% { border-radius: 58% 42% 38% 62% / 56% 58% 42% 44%; }
}
@keyframes spin { to { filter: hue-rotate(360deg) blur(.5px); } }
.chip { position: absolute; display: flex; align-items: center; gap: 8px; padding: 9px 14px; border-radius: 14px; background: var(--surface-strong); border: 1px solid var(--border-strong); box-shadow: var(--shadow); font-size: .85rem; font-weight: 600; animation: bob 6s ease-in-out infinite; }
.chip-ico { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 8px; background: #68217a; color: #fff; font-size: .7rem; font-weight: 800; }
.chip-ico.react { background: #0b2a3a; color: #61dafb; font-size: .95rem; }
.chip-ico.azure { background: #0078d4; font-size: .9rem; }
.chip-a { top: 8%; left: -12%; }
.chip-b { top: 46%; right: -14%; animation-delay: -2s; }
.chip-c { bottom: 4%; left: -4%; animation-delay: -4s; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.code-card { margin-top: 34px; width: min(400px, 100%); background: var(--code-bg); border: 1px solid rgba(148, 163, 184, .2); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; color: #cbd5e1; }
.code-dots { display: flex; align-items: center; gap: 6px; padding: 10px 14px; border-bottom: 1px solid rgba(148, 163, 184, .14); }
.code-dots i { width: 10px; height: 10px; border-radius: 50%; background: #ef4444; }
.code-dots i:nth-child(2) { background: #f59e0b; }
.code-dots i:nth-child(3) { background: #22c55e; }
.code-dots span { margin-left: 8px; font-family: var(--mono); font-size: .75rem; color: #64748b; }
.code-card pre { padding: 14px 18px 18px; font-family: var(--mono); font-size: .8rem; line-height: 1.7; overflow-x: auto; }
.code-card .k { color: #c084fc; } .code-card .t { color: #67e8f9; } .code-card .s { color: #86efac; } .code-card .n { color: #fbbf24; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 70px; }
.stat { padding: 22px 24px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); backdrop-filter: blur(10px); }
.stat strong { display: block; font-size: 2.2rem; font-weight: 800; letter-spacing: -.03em; line-height: 1.1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--muted); font-size: .9rem; }

/* ---------- Sections ---------- */
.section { padding: 110px 0; position: relative; }
.section-alt { background: linear-gradient(180deg, transparent, var(--bg-alt) 12%, var(--bg-alt) 88%, transparent); }
.section-head { max-width: 720px; margin-bottom: 52px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-2); }
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--grad); border-radius: 2px; }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); line-height: 1.15; letter-spacing: -.03em; font-weight: 800; margin-top: 14px; }
.section-head p { color: var(--text-soft); margin-top: 14px; font-size: 1.05rem; }
h3 { font-size: 1.15rem; letter-spacing: -.01em; font-weight: 700; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: start; }
.about-text p { color: var(--text-soft); font-size: 1.06rem; }
.about-text p + p { margin-top: 18px; }
.focus-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.focus-card { padding: 24px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); transition: transform .3s var(--ease), border-color .3s; }
.focus-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.focus-ico { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 16px; background: var(--tag-bg); color: var(--tag-text); }
.focus-ico svg { width: 22px; height: 22px; }
.focus-card p { color: var(--muted); font-size: .93rem; margin-top: 6px; }

/* Tags */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tags span { padding: 6px 12px; border-radius: 999px; font-size: .82rem; font-weight: 500; background: var(--tag-bg); color: var(--tag-text); border: 1px solid rgba(99, 102, 241, .18); }
.tags.small span { font-size: .76rem; padding: 4px 10px; }

/* Skills */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.filter { padding: 8px 16px; border-radius: 999px; border: 1px solid var(--border-strong); color: var(--text-soft); font-size: .88rem; font-weight: 500; transition: all .2s; }
.filter:hover { color: var(--text); border-color: var(--accent-1); }
.filter.is-active { background: var(--grad); color: #fff; border-color: transparent; }
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.skill-card { position: relative; padding: 26px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); overflow: hidden; transition: transform .3s var(--ease), border-color .3s, opacity .3s; }
.skill-card::after { content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0; transition: opacity .3s; pointer-events: none; }
.skill-card:hover { transform: translateY(-4px); }
.skill-card:hover::after { opacity: 1; }
.skill-card.is-hidden { display: none; }
.skill-top { display: flex; align-items: center; gap: 12px; }
.skill-badge { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 12px; font-family: var(--mono); font-size: .8rem; font-weight: 700; color: #fff; }
.b1 { background: linear-gradient(135deg, #6366f1, #8b5cf6); }
.b2 { background: linear-gradient(135deg, #06b6d4, #3b82f6); }
.b3 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.b4 { background: linear-gradient(135deg, #0078d4, #06b6d4); }
.b5 { background: linear-gradient(135deg, #10b981, #14b8a6); }
.b6 { background: linear-gradient(135deg, #ec4899, #a855f7); }
.skill-card > p { color: var(--muted); font-size: .92rem; margin-top: 12px; }

.marquee { margin-top: 56px; overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.marquee-track { display: flex; gap: 14px; width: max-content; animation: marquee 40s linear infinite; }
.marquee-track span { font-family: var(--mono); font-size: 1rem; color: var(--muted); padding: 10px 20px; border: 1px dashed var(--border-strong); border-radius: 12px; white-space: nowrap; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* Timeline */
.timeline { position: relative; display: grid; gap: 28px; padding-left: 36px; }
.timeline::before { content: ""; position: absolute; left: 9px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(var(--accent-1), var(--accent-2), transparent); }
.t-item { position: relative; }
.t-marker { position: absolute; left: -36px; top: 28px; width: 20px; height: 20px; border-radius: 50%; background: var(--bg); border: 3px solid var(--accent-1); }
.t-marker.current { border-color: var(--green); box-shadow: 0 0 0 6px rgba(34, 197, 94, .15); }
.t-card { padding: 28px 30px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); transition: border-color .3s; }
.t-card:hover { border-color: var(--border-strong); }
.t-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.t-org { color: var(--accent-2); font-weight: 500; font-size: .95rem; margin-top: 2px; }
.t-date { font-family: var(--mono); font-size: .8rem; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--border-strong); color: var(--text-soft); white-space: nowrap; }
.t-card ul { list-style: none; display: grid; gap: 8px; }
.t-card li { position: relative; padding-left: 22px; color: var(--text-soft); font-size: .97rem; }
.t-card li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 8px; height: 8px; border-radius: 2px; background: var(--grad); transform: rotate(45deg); }

/* Projects */
.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.project-card { position: relative; padding: 30px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); overflow: hidden; display: flex; flex-direction: column; transition: transform .35s var(--ease), border-color .3s, box-shadow .35s; }
.project-card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.project-card.featured { grid-column: 1 / -1; background: linear-gradient(160deg, rgba(99, 102, 241, .14), rgba(6, 182, 212, .06) 60%, var(--surface)); border-color: rgba(99, 102, 241, .3); }
.project-glow { position: absolute; width: 300px; height: 300px; border-radius: 50%; background: radial-gradient(circle, rgba(99, 102, 241, .35), transparent 70%); top: -120px; right: -100px; pointer-events: none; }
.project-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; }
.badge { display: inline-flex; align-items: center; gap: 8px; padding: 5px 12px; border-radius: 999px; font-size: .76rem; font-weight: 600; background: var(--surface-strong); border: 1px solid var(--border-strong); color: var(--text-soft); }
.badge-live { color: var(--green); border-color: rgba(34, 197, 94, .35); }
.project-year { font-family: var(--mono); font-size: .78rem; color: var(--muted); }
.project-card h3 { font-size: 1.6rem; letter-spacing: -.02em; }
.featured h3 { font-size: 2.2rem; }
.featured > p { max-width: 760px; }
.featured .checks, .wide .checks { grid-template-columns: 1fr 1fr; column-gap: 24px; }
.project-card.wide { grid-column: 1 / -1; }
.wide > p { max-width: 760px; }
.project-sub { color: var(--accent-2); font-weight: 500; margin: 4px 0 14px; }
.project-card > p { color: var(--text-soft); }
.checks { list-style: none; margin-top: 18px; display: grid; gap: 8px; }
.checks li { display: flex; gap: 10px; color: var(--text-soft); font-size: .94rem; }
.checks li::before { content: "✓"; flex-shrink: 0; width: 20px; height: 20px; border-radius: 6px; display: grid; place-items: center; font-size: .7rem; font-weight: 800; color: #fff; background: var(--grad); margin-top: 2px; }
.project-card .tags { margin-top: auto; padding-top: 22px; }

/* Architecture */
.arch { display: grid; grid-template-columns: 1fr 40px 1fr 40px 1fr 40px 1fr; align-items: stretch; }
.arch-node { padding: 24px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); position: relative; }
.arch-step { font-family: var(--mono); font-size: .78rem; color: var(--accent-2); }
.arch-node h3 { margin: 6px 0 8px; }
.arch-node p { color: var(--muted); font-size: .9rem; }
.arch-link { display: grid; place-items: center; position: relative; }
.arch-link span { width: 100%; height: 2px; background: repeating-linear-gradient(90deg, var(--accent-1) 0 6px, transparent 6px 12px); background-size: 24px 2px; animation: dash 1s linear infinite; }
.arch-link::after { content: ""; position: absolute; right: 2px; width: 8px; height: 8px; border-top: 2px solid var(--accent-2); border-right: 2px solid var(--accent-2); transform: rotate(45deg); }
@keyframes dash { to { background-position: 24px 0; } }
.principles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; }
.principle { padding: 20px 22px; border-radius: var(--radius-sm); border-left: 3px solid var(--accent-1); background: var(--surface); }
.principle h4 { font-size: 1rem; }
.principle p { color: var(--muted); font-size: .88rem; margin-top: 4px; }

/* Resume */
.resume-card { display: grid; grid-template-columns: 1.3fr .7fr; gap: 40px; align-items: center; padding: 48px; border-radius: 28px; border: 1px solid var(--border); background: var(--surface); }
.resume-info p { color: var(--text-soft); margin-top: 14px; max-width: 520px; }
.resume-preview { position: relative; justify-self: center; transition: transform .4s var(--ease); }
.resume-preview:hover { transform: rotate(-2deg) translateY(-6px); }
.paper { width: 220px; aspect-ratio: 8.5 / 11; background: #fff; border-radius: 10px; padding: 20px 18px; box-shadow: 0 30px 60px rgba(0, 0, 0, .35); transform: rotate(3deg); }
.paper-name { height: 12px; width: 70%; background: #0f172a; border-radius: 3px; }
.paper-title { height: 6px; width: 50%; background: #6366f1; border-radius: 3px; margin-top: 6px; }
.paper-rule { height: 2px; background: #6366f1; margin: 12px 0 8px; opacity: .7; }
.paper-line { height: 4px; background: #cbd5e1; border-radius: 2px; margin-top: 5px; }
.w60 { width: 60%; } .w65 { width: 65%; } .w70 { width: 70%; } .w75 { width: 75%; } .w80 { width: 80%; } .w85 { width: 85%; } .w90 { width: 90%; }
.paper-boxes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; margin-top: 8px; }
.paper-boxes i { height: 18px; border: 1px solid #e2e8f0; border-radius: 3px; }
.paper-tag { position: absolute; bottom: -14px; left: 50%; transform: translateX(-50%); padding: 6px 14px; border-radius: 999px; background: var(--grad); color: #fff; font-size: .78rem; font-weight: 600; white-space: nowrap; }

/* Contact */
.contact-card { text-align: center; padding: 72px 40px; border-radius: 32px; position: relative; overflow: hidden; border: 1px solid rgba(99, 102, 241, .3); background: radial-gradient(ellipse at top, rgba(99, 102, 241, .22), transparent 60%), radial-gradient(ellipse at bottom right, rgba(6, 182, 212, .16), transparent 60%), var(--surface); }
.contact-card .eyebrow { justify-content: center; }
.contact-card h2 { max-width: 760px; margin-left: auto; margin-right: auto; }
.contact-card p { color: var(--text-soft); max-width: 580px; margin: 16px auto 0; font-size: 1.05rem; }
.contact-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-top: 34px; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 30px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer p { color: var(--muted); font-size: .88rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a { color: var(--muted); font-size: .9rem; transition: color .2s; }
.footer-links a:hover { color: var(--text); }
@media (max-width: 600px) { .faq-item summary { padding: 16px 18px; } .faq-item p { padding: 0 18px 18px; } }

/* FAQ */
.faq-list { display: grid; gap: 12px; max-width: 880px; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); transition: border-color .25s; }
.faq-item[open], .faq-item:hover { border-color: var(--border-strong); }
.faq-item summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 20px 24px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary h3 { font-size: 1.05rem; }
.faq-icon { position: relative; width: 28px; height: 28px; flex-shrink: 0; border-radius: 8px; background: var(--tag-bg); }
.faq-icon::before, .faq-icon::after { content: ""; position: absolute; left: 50%; top: 50%; width: 12px; height: 2px; background: var(--tag-text); transform: translate(-50%, -50%); transition: transform .25s var(--ease); }
.faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-item[open] .faq-icon::after { transform: translate(-50%, -50%) rotate(0deg); }
.faq-item p { padding: 0 24px 22px; color: var(--text-soft); }
.faq-item a { color: var(--accent-2); }

/* ---------- Reveal animation ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: var(--d, 0s); }
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .nav-links a { padding: 8px 10px; }
  .arch { grid-template-columns: 1fr 1fr; gap: 16px; }
  .arch-link { display: none; }
  .principles { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 960px) {
  .menu-btn { display: grid; }
  .nav-links {
    position: absolute; top: 72px; left: 16px; right: 16px; flex-direction: column; gap: 2px; padding: 10px;
    border-radius: 18px; border: 1px solid var(--border-strong); background: var(--surface-strong); box-shadow: var(--shadow);
    opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all .25s var(--ease);
  }
  .nav-links.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .hero { padding-top: 120px; min-height: auto; }
  .hero-grid, .about-grid, .resume-card { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .portrait { width: 260px; }
  .chip-a { left: -22%; } .chip-b { right: -22%; }
  .code-card { display: none; }
  .stats { grid-template-columns: 1fr 1fr; margin-top: 48px; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .featured .checks, .wide .checks { grid-template-columns: 1fr; }
  .resume-card { padding: 36px 28px; }
}

@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .nav-cta, .brand-text { display: none; }
  .section { padding: 80px 0; }
  .portrait { width: 220px; }
  .chip { font-size: .75rem; padding: 7px 10px; }
  .chip-ico { width: 22px; height: 22px; }
  .chip-a { left: -18%; } .chip-b { right: -20%; } .chip-c { left: -10%; }
  .skills-grid, .focus-grid, .arch, .principles { grid-template-columns: 1fr; }
  .stat { padding: 18px; }
  .stat strong { font-size: 1.9rem; }
  .hero-actions .btn { flex: 1 1 100%; }
  .t-card, .project-card { padding: 22px; }
  .timeline { padding-left: 26px; }
  .timeline::before { left: 5px; }
  .t-marker { left: -28px; width: 16px; height: 16px; }
  .featured h3 { font-size: 1.8rem; }
  .contact-card { padding: 52px 20px; }
  .contact-actions .btn { flex: 1 1 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; }
}

@media print {
  .nav, .bg-orbs, .scroll-progress, .marquee, .hero-visual { display: none; }
  .js .reveal { opacity: 1; transform: none; }
}