/* =========================================================
   IM x AI — portfolio (light)
   Single design system. Tokens in :root.
   ========================================================= */

:root {
  --bg:        #f7f7fb;
  --bg-soft:   #ffffff;
  --surface:   #ffffff;
  --surface-2: #f2f2f7;
  --line:      rgba(15, 15, 25, 0.09);
  --line-2:    rgba(15, 15, 25, 0.16);
  --text:      #16161d;
  --muted:     #5b5b68;
  --faint:     #9a9aa6;

  --accent:      #5b4be8;
  --accent-2:    #0a95c9;
  --accent-soft: rgba(91, 75, 232, 0.12);
  --accent-line: rgba(91, 75, 232, 0.42);

  --grid-line:   rgba(15, 15, 25, 0.045);
  --name-grad:   linear-gradient(180deg, #16161d 30%, #55555f);
  --nav-bg:      rgba(247, 247, 251, 0.78);
  --card-shadow: 0 24px 50px -30px rgba(20, 20, 40, 0.28);
  color-scheme: light;

  --font-sans:    "Inter", system-ui, -apple-system, sans-serif;
  --font-display: "Space Grotesk", var(--font-sans);
  --font-mono:    "JetBrains Mono", ui-monospace, monospace;

  --maxw: 1120px;
  --pad: clamp(1.25rem, 4vw, 2.5rem);
  --section-y: clamp(5rem, 11vw, 9rem);
  --radius: 16px;
  --radius-sm: 10px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.03em; line-height: 1.04; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }

/* ambient background */
.bg-grid {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
          mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}
.bg-glow {
  position: fixed; z-index: -1; pointer-events: none;
  top: -20%; left: 50%; transform: translateX(-50%);
  width: 900px; height: 700px;
  background: radial-gradient(circle at center, var(--accent-soft), transparent 62%);
  filter: blur(30px);
}

/* nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
}
.nav.scrolled { background: var(--nav-bg); backdrop-filter: blur(14px); border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }
.brand-mark { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; letter-spacing: -0.02em; }
.brand-x { color: var(--accent); margin-inline: 1px; }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 0.9rem; color: var(--muted); font-weight: 500; position: relative; transition: color .2s; }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -6px; height: 1px; width: 0; background: var(--accent); transition: width .25s; }
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.9rem; font-weight: 500; padding: 0.7rem 1.2rem;
  border-radius: 100px; border: 1px solid transparent;
  transition: transform .18s ease, background .2s, border-color .2s, box-shadow .2s;
  cursor: pointer; white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(180deg, #8b7bff, var(--accent)); color: #fff; box-shadow: 0 8px 24px -8px var(--accent); }
.btn-primary:hover { box-shadow: 0 12px 30px -8px var(--accent); }
.btn-ghost { border-color: var(--line-2); color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent-line); background: var(--accent-soft); }
.btn-arrow { transition: transform .2s; }
.btn:hover .btn-arrow { transform: translateX(3px); }
.nav-cta { padding: 0.5rem 0.95rem; font-size: 0.82rem; }

.status-dot { width: 7px; height: 7px; border-radius: 50%; background: #35d07f; box-shadow: 0 0 0 3px rgba(53, 208, 127, 0.18); display: inline-block; }

/* hero */
.hero { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; padding-top: clamp(3.5rem, 8vw, 6rem); padding-bottom: clamp(3rem, 7vw, 5rem); }
.eyebrow { display: inline-flex; align-items: center; gap: 0.7rem; font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 1.5rem; }
.eyebrow-line { width: 28px; height: 1px; background: var(--accent-2); display: inline-block; }
.hero-name { font-size: clamp(3.2rem, 9vw, 5.75rem); margin-bottom: 1.5rem; background: var(--name-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lede { font-size: clamp(1.1rem, 2.2vw, 1.4rem); font-weight: 500; max-width: 34ch; margin-bottom: 1rem; }
.hero-sub { color: var(--muted); max-width: 42ch; margin-bottom: 2.25rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-bottom: 2.25rem; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 1.75rem; font-size: 0.88rem; color: var(--muted); }
.fact { display: inline-flex; align-items: center; gap: 0.5rem; }

/* hero code panel */
.hero-panel { background: linear-gradient(180deg, var(--surface), var(--bg-soft)); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--card-shadow); }
.panel-head { display: flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1rem; border-bottom: 1px solid var(--line); background: var(--surface-2); }
.panel-dots { display: inline-flex; gap: 0.4rem; }
.panel-dots i { width: 11px; height: 11px; border-radius: 50%; background: var(--surface-2); }
.panel-dots i:first-child { background: #ff5f57; }
.panel-dots i:nth-child(2) { background: #febc2e; }
.panel-dots i:nth-child(3) { background: #28c840; }
.panel-title { font-family: var(--font-mono); font-size: 0.78rem; color: var(--faint); }
.panel-body { font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.9; padding: 1.4rem 1.3rem; color: var(--text); overflow-x: auto; background: #12121a; }
.panel-meta { display: flex; justify-content: space-between; align-items: center; padding: 0.7rem 1.3rem; border-top: 1px solid var(--line); font-family: var(--font-mono); font-size: 0.72rem; color: var(--faint); background: #12121a; }
.panel-body, .panel-meta { color: #d7d7e2; }
.c-com { color: #6b6b7b; } .c-key { color: #c792ff; } .c-var { color: #4ad6ff; }
.c-prop { color: #d7d7e2; } .c-str { color: #7ee787; } .c-num { color: #ffb86c; }
.blink { animation: blink 1.1s steps(2) infinite; color: #4ad6ff; }
@keyframes blink { 50% { opacity: 0; } }

/* impact strip */
.impact { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin-top: clamp(1rem, 3vw, 2rem); }
.impact-item { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.6rem 1.5rem; background: var(--surface); }
.impact-key { font-family: var(--font-display); font-size: 1.15rem; font-weight: 600; color: var(--accent); }
.impact-val { font-size: 0.9rem; color: var(--muted); }

/* sections */
.section { padding-block: var(--section-y); scroll-margin-top: 88px; }
.kicker { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 1rem; }
.section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); max-width: 44ch; }
.section-head h2 { font-size: clamp(1.9rem, 4.5vw, 3rem); }
.section-note { color: var(--muted); margin-top: 1.1rem; }

/* project grid */
.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.1rem; }
.project-card { position: relative; display: flex; flex-direction: column; min-height: 280px; padding: 1.6rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .25s ease, border-color .25s, background .25s; }
.project-card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 0%), var(--accent-soft), transparent 45%); opacity: 0; transition: opacity .3s; pointer-events: none; }
.project-card:hover { transform: translateY(-4px); border-color: var(--accent-line); background: var(--surface-2); }
.project-card:hover::before { opacity: 1; }
.pc-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1.25rem; }
.pc-name-wrap { display: flex; flex-direction: column; }
.pc-former { font-family: var(--font-mono); font-size: 0.7rem; color: var(--faint); margin-top: 0.15rem; }
.pc-status { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase; padding: 0.3rem 0.6rem; border-radius: 100px; border: 1px solid var(--line-2); color: var(--muted); display: inline-flex; align-items: center; gap: 0.4rem; white-space: nowrap; }
.pc-status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.pc-status.live    { color: #2ba25f; border-color: rgba(43,162,95,0.4); }
.pc-status.staging { color: #b5730e; border-color: rgba(181,115,14,0.4); }
.pc-status.demo    { color: var(--accent-2); border-color: rgba(10,149,201,0.4); }
.pc-status.planned { color: var(--faint); }
.pc-name { font-family: var(--font-display); font-size: 1.75rem; font-weight: 600; line-height: 1.1; }
.pc-summary { color: var(--muted); font-size: 0.92rem; margin-bottom: 1.5rem; flex-grow: 1; }
.pc-bottom { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; }
.pc-link { flex-shrink: 0; font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); font-weight: 500; white-space: nowrap; transition: transform .2s; }
.pc-link:hover { transform: translateX(3px); }
.pc-stack { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.pc-stack span { font-family: var(--font-mono); font-size: 0.68rem; color: var(--muted); padding: 0.25rem 0.55rem; border: 1px solid var(--line); border-radius: 6px; background: var(--bg-soft); }

/* marquee */
.marquee-wrap { border-block: 1px solid var(--line); padding-block: 1.1rem; margin-block: clamp(1rem, 4vw, 2.5rem); overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.marquee-track { display: inline-flex; align-items: center; gap: 1.5rem; white-space: nowrap; animation: scroll 34s linear infinite; }
.marquee-track span { font-family: var(--font-mono); font-size: 0.9rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.marquee-track .sep { color: var(--accent); }
@keyframes scroll { to { transform: translateX(-50%); } }

/* approach */
.approach-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
.approach-left h2 { font-size: clamp(1.9rem, 4vw, 2.75rem); margin-bottom: 2rem; }
.approach-copy p { color: var(--muted); margin-bottom: 1.1rem; max-width: 46ch; }
.approach-credit { color: var(--text) !important; font-style: italic; border-left: 2px solid var(--accent); padding-left: 1rem; margin-top: 1.5rem; }
.approach-right { display: grid; gap: 1rem; }
.principle { position: relative; padding: 1.5rem; padding-left: 3.5rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); transition: border-color .2s, transform .2s; }
.principle:hover { border-color: var(--accent-line); transform: translateX(4px); }
.principle-n { position: absolute; left: 1.5rem; top: 1.5rem; font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); }
.principle h3 { font-size: 1.1rem; margin-bottom: 0.4rem; }
.principle p { color: var(--muted); font-size: 0.9rem; }

/* experience */
.exp-list { border-top: 1px solid var(--line); }
.exp-item { display: flex; justify-content: space-between; gap: 1.5rem; padding: 1.5rem 0; border-bottom: 1px solid var(--line); transition: padding-left .25s; }
.exp-item:hover { padding-left: 0.75rem; }
.exp-item:hover h3 { color: var(--accent-2); }
.exp-body h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.3rem; transition: color .2s; }
.exp-role { font-size: 0.92rem; color: var(--text); margin-bottom: 0.5rem; }
.exp-note { font-size: 0.88rem; color: var(--muted); max-width: 58ch; }
.exp-date { font-family: var(--font-mono); font-size: 0.82rem; color: var(--faint); white-space: nowrap; padding-top: 0.3rem; }
.exp-item-cert .exp-body h3 { font-size: 1.05rem; }

/* contact */
.contact-panel { position: relative; text-align: center; padding: clamp(3rem, 7vw, 5.5rem) var(--pad); border: 1px solid var(--line); border-radius: 24px; overflow: hidden; background: linear-gradient(180deg, var(--surface), var(--bg-soft)); }
.contact-glow { position: absolute; top: -40%; left: 50%; transform: translateX(-50%); width: 600px; height: 400px; background: radial-gradient(circle, var(--accent-soft), transparent 65%); filter: blur(20px); pointer-events: none; }
.contact-panel .kicker, .contact-panel h2, .contact-lede, .contact-links { position: relative; }
.contact-panel h2 { font-size: clamp(2rem, 5vw, 3.25rem); margin-bottom: 1.25rem; }
.contact-lede { color: var(--muted); max-width: 46ch; margin: 0 auto 2.25rem; }
.contact-links { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; }

/* footer */
.footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 2.5rem; border-top: 1px solid var(--line); font-size: 0.82rem; color: var(--faint); }
.footer-brand { font-family: var(--font-display); font-weight: 700; color: var(--text); }
.footer-credit { color: var(--muted); }

/* 404 */
.notfound { min-height: 60vh; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: 1rem; padding-block: var(--section-y); }
.notfound h1 { font-size: clamp(3rem, 12vw, 7rem); background: var(--name-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.notfound p { color: var(--muted); max-width: 40ch; }

/* reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-panel { display: none; }
  .impact { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .approach-grid { grid-template-columns: 1fr; }
  .exp-item { flex-direction: column; gap: 0.5rem; }
  .nav-links { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}