/* =================================================================
   Kittan Portfolio LP — Modern SaaS / HR Tech
   Design direction: professional blue (matches Clock-K logo),
   deep navy ink, warm-neutral surfaces, editorial rhythm, CSS depth.
   ================================================================= */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand blue (from logo) */
  --blue-50:  #EFF6FF;
  --blue-100: #DBEAFE;
  --blue-200: #BFDBFE;
  --blue-300: #93C5FD;
  --blue-500: #2563EB;
  --blue-600: #1D4ED8;
  --blue-700: #1E40AF;

  /* Ink / neutrals */
  --ink-900: #0B1220;
  --ink-800: #0F172A;
  --ink-700: #1E293B;
  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-400: #94A3B8;
  --slate-300: #CBD5E1;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
  --slate-50:  #F8FAFC;
  --white: #FFFFFF;

  /* Semantic */
  --ok: #10B981;
  --ok-bg: #ECFDF5;
  --warn: #F59E0B;
  --warn-bg: #FFFBEB;
  --no: #EF4444;
  --no-bg: #FEF2F2;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo",
    sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Menlo", "Consolas",
    "Courier New", monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.375rem;
  --text-2xl:  clamp(1.5rem, 1.2rem + 1.4vw, 2rem);
  --text-3xl:  clamp(1.9rem, 1.4rem + 2.4vw, 2.85rem);
  --text-hero: clamp(2.4rem, 1.3rem + 4.6vw, 4.6rem);

  /* Spacing */
  --space-section: clamp(4.5rem, 3rem + 6vw, 8.5rem);
  --container: 1180px;
  --container-narrow: 880px;

  /* Radii + shadow + motion */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 32px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.10);
  --shadow-md: 0 8px 24px rgba(15,23,42,.08), 0 2px 6px rgba(15,23,42,.06);
  --shadow-lg: 0 24px 60px rgba(15,23,42,.16), 0 8px 20px rgba(15,23,42,.08);
  --shadow-blue: 0 24px 60px rgba(37,99,235,.28);
  --dur: 240ms;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--ink-800);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.02em; font-weight: 800; }

/* ---------- Layout helpers ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 1.5rem; }
.narrow { max-width: var(--container-narrow); }
.section { padding-block: var(--space-section); }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-mono); font-size: var(--text-sm);
  font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  color: var(--blue-600);
}
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--blue-500); }
.section-head { max-width: 720px; margin-bottom: 3.25rem; }
.section-head h2 { font-size: var(--text-3xl); margin-block: .9rem .8rem; color: var(--ink-800); }
.section-head p { color: var(--slate-600); font-size: var(--text-lg); }
.center { text-align: center; margin-inline: auto; }
.center .eyebrow::before { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 700; font-size: var(--text-base);
  padding: .85rem 1.6rem; border-radius: 999px;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
  cursor: pointer; border: 0;
}
.btn-primary { background: var(--blue-500); color: #fff; box-shadow: var(--shadow-blue); }
.btn-primary:hover { transform: translateY(-2px); background: var(--blue-600); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.28); }
.btn-ghost:hover { background: rgba(255,255,255,.16); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--blue-600); border: 1.5px solid var(--blue-200); }
.btn-outline:hover { border-color: var(--blue-500); transform: translateY(-2px); }

/* ============================================================
   NAVBAR
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--slate-200);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: .65rem; font-weight: 800; font-size: var(--text-lg); letter-spacing: -.02em; }
.brand img { width: 34px; height: 34px; }
.brand .tld { color: var(--slate-400); font-weight: 600; }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a { font-size: var(--text-sm); font-weight: 600; color: var(--slate-600); transition: color var(--dur); }
.nav-links a:hover { color: var(--blue-600); }
.nav-tag {
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 600;
  color: var(--blue-700); background: var(--blue-50);
  border: 1px solid var(--blue-200); padding: .3rem .7rem; border-radius: 999px;
}
.nav-toggle { display: none; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1100px 520px at 78% -8%, var(--blue-50), transparent 60%),
    radial-gradient(800px 440px at 6% 8%, #F5F8FF, transparent 55%),
    var(--white);
  padding-block: clamp(3.5rem, 2rem + 6vw, 6.5rem) var(--space-section);
}
.hero-grid {
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 3.5rem; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 600;
  color: var(--blue-700); background: var(--blue-50);
  border: 1px solid var(--blue-200); padding: .42rem .85rem; border-radius: 999px;
  margin-bottom: 1.5rem;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px var(--ok-bg); }
.hero h1 { font-size: var(--text-hero); color: var(--ink-800); margin-bottom: 1.4rem; }
.hero h1 .grad {
  background: linear-gradient(120deg, var(--blue-500), var(--blue-700));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead { font-size: var(--text-lg); color: var(--slate-600); max-width: 30rem; margin-bottom: 2rem; }
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2.4rem; }
.hero-stack { display: flex; flex-wrap: wrap; gap: .55rem; }
.chip {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: var(--text-sm); font-weight: 600; color: var(--slate-600);
  background: var(--white); border: 1px solid var(--slate-200);
  padding: .42rem .85rem; border-radius: 999px; box-shadow: var(--shadow-sm);
}
.chip b { color: var(--ink-800); }

/* Hero visual: floating phone + cards */
.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-visual .phone { transform: rotate(-3deg); animation: floaty 7s ease-in-out infinite; }
.float-card {
  position: absolute; background: #fff; border: 1px solid var(--slate-200);
  border-radius: var(--r-md); box-shadow: var(--shadow-lg); padding: .8rem 1rem;
  display: flex; align-items: center; gap: .7rem; font-size: var(--text-sm); font-weight: 600;
}
.float-card .ico { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; flex: none; }
.float-card.fc-approve { top: 12%; left: -4%; animation: floaty 6s ease-in-out infinite; }
.float-card.fc-sync    { bottom: 16%; right: -6%; animation: floaty 8s ease-in-out infinite .4s; }
.float-card .ico.green { background: var(--ok-bg); color: var(--ok); }
.float-card .ico.blue  { background: var(--blue-50); color: var(--blue-600); }
.float-card small { display: block; font-weight: 500; color: var(--slate-400); font-size: var(--text-xs); }
@keyframes floaty { 0%,100% { transform: translateY(0) rotate(-3deg);} 50% { transform: translateY(-14px) rotate(-3deg);} }
.float-card.fc-approve, .float-card.fc-sync { animation-name: floaty2; }
@keyframes floaty2 { 0%,100% { transform: translateY(0);} 50% { transform: translateY(-10px);} }

/* trust bar */
.trustbar { border-top: 1px solid var(--slate-200); }
.trustbar .container { display: flex; flex-wrap: wrap; gap: 2.5rem; justify-content: center; padding-block: 1.6rem; }
.trust-item { display: flex; align-items: baseline; gap: .55rem; color: var(--slate-500); font-size: var(--text-sm); font-weight: 600; }
.trust-item b { font-size: var(--text-xl); color: var(--ink-800); font-weight: 800; letter-spacing: -.02em; }

/* ============================================================
   DEVICE MOCKUPS (pure CSS)
   ============================================================ */
.phone {
  width: 290px; flex: none; background: #0b1220; border-radius: 42px;
  padding: 12px; box-shadow: var(--shadow-lg); position: relative;
}
.phone::before {
  content: ""; position: absolute; top: 22px; left: 50%; transform: translateX(-50%);
  width: 110px; height: 26px; background: #0b1220; border-radius: 0 0 16px 16px; z-index: 3;
}
.phone-screen {
  background: var(--slate-50); border-radius: 32px; overflow: hidden;
  height: 580px; position: relative; display: flex; flex-direction: column;
}
.scr-top { padding: 2.6rem 1.1rem 1rem; }
.scr-app { display: flex; align-items: center; gap: .5rem; font-weight: 800; color: var(--ink-800); font-size: var(--text-sm); }
.scr-app img { width: 22px; height: 22px; }

/* Stamp screen */
.stamp { flex: 1; display: flex; flex-direction: column; align-items: center; padding: .4rem 1.1rem 1rem; }
.stamp-status { font-size: var(--text-xs); font-weight: 700; color: var(--ok); background: var(--ok-bg); padding: .25rem .7rem; border-radius: 999px; margin-bottom: 1rem; }
.stamp-clock { font-family: var(--font-mono); font-size: 2.7rem; font-weight: 700; color: var(--ink-800); letter-spacing: -.02em; line-height: 1; }
.stamp-clock span { font-size: 1.1rem; color: var(--slate-400); }
.stamp-date { font-size: var(--text-xs); color: var(--slate-500); margin-bottom: 1.3rem; }
.stamp-btns { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; width: 100%; margin-bottom: 1.3rem; }
.stamp-btn { padding: 1rem .5rem; border-radius: var(--r-md); text-align: center; font-weight: 800; font-size: var(--text-sm); }
.stamp-btn.in { background: var(--blue-500); color: #fff; box-shadow: 0 8px 18px rgba(37,99,235,.35); }
.stamp-btn.out { background: #fff; color: var(--slate-500); border: 1.5px solid var(--slate-200); }
.stamp-btn small { display: block; font-size: 1.4rem; margin-bottom: .15rem; }
.timeline { width: 100%; background: #fff; border-radius: var(--r-md); border: 1px solid var(--slate-200); padding: .9rem; }
.timeline h5 { font-size: var(--text-xs); color: var(--slate-400); margin-bottom: .6rem; letter-spacing: .04em; }
.tl-row { display: flex; align-items: center; gap: .6rem; padding: .35rem 0; font-size: var(--text-sm); }
.tl-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.tl-dot.b { background: var(--blue-500); } .tl-dot.g { background: var(--ok); }
.tl-row b { margin-left: auto; font-family: var(--font-mono); color: var(--ink-700); }

/* phone bottom nav */
.scr-nav { display: flex; border-top: 1px solid var(--slate-200); background: #fff; }
.scr-nav div { flex: 1; text-align: center; padding: .7rem 0; font-size: var(--text-xs); font-weight: 600; color: var(--slate-400); }
.scr-nav div.on { color: var(--blue-600); }
.scr-nav div small { display: block; font-size: 1.15rem; margin-bottom: .1rem; }

/* Calendar screen */
.cal { flex: 1; padding: .3rem 1rem 1rem; }
.cal-head { display: flex; justify-content: space-between; align-items: center; font-weight: 800; color: var(--ink-800); margin-bottom: .8rem; font-size: var(--text-sm); }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal-grid span { aspect-ratio: 1; display: grid; place-items: center; font-size: 10px; border-radius: 7px; color: var(--slate-500); background: #fff; }
.cal-grid span.dow { background: transparent; color: var(--slate-400); font-weight: 700; aspect-ratio: auto; }
.cal-grid span.work { background: var(--blue-50); color: var(--blue-700); font-weight: 700; }
.cal-grid span.leave { background: var(--warn-bg); color: var(--warn); font-weight: 700; }
.cal-grid span.today { background: var(--blue-500); color: #fff; font-weight: 800; }
.cal-sum { display: flex; gap: .5rem; margin-top: .9rem; }
.cal-sum div { flex: 1; background: #fff; border: 1px solid var(--slate-200); border-radius: var(--r-sm); padding: .55rem; text-align: center; }
.cal-sum b { display: block; font-size: var(--text-base); color: var(--ink-800); font-weight: 800; }
.cal-sum small { font-size: 9px; color: var(--slate-400); }

/* Browser frame (admin) */
.browser { background: #fff; border-radius: var(--r-lg); box-shadow: var(--shadow-lg); overflow: hidden; border: 1px solid var(--slate-200); }
.browser-bar { display: flex; align-items: center; gap: .5rem; padding: .7rem 1rem; background: var(--slate-100); border-bottom: 1px solid var(--slate-200); }
.browser-bar .dots { display: flex; gap: .4rem; }
.browser-bar .dots i { width: 11px; height: 11px; border-radius: 50%; background: var(--slate-300); }
.browser-bar .url { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--slate-500); background: #fff; border: 1px solid var(--slate-200); border-radius: 999px; padding: .25rem .8rem; margin-left: .4rem; }
.admin-body { display: grid; grid-template-columns: 180px 1fr; min-height: 380px; }
.admin-side { background: var(--ink-800); padding: 1.1rem .8rem; }
.admin-side .a-brand { display: flex; align-items: center; gap: .5rem; color: #fff; font-weight: 800; font-size: var(--text-sm); margin-bottom: 1.2rem; }
.admin-side .a-brand img { width: 22px; height: 22px; }
.admin-side a { display: flex; align-items: center; gap: .55rem; color: var(--slate-400); font-size: var(--text-sm); font-weight: 600; padding: .55rem .6rem; border-radius: var(--r-sm); margin-bottom: .2rem; }
.admin-side a.on { background: rgba(37,99,235,.22); color: #fff; }
.admin-main { padding: 1.3rem 1.4rem; background: var(--slate-50); }
.admin-main h4 { font-size: var(--text-base); color: var(--ink-800); margin-bottom: .2rem; }
.admin-main .sub { font-size: var(--text-xs); color: var(--slate-500); margin-bottom: 1rem; }
.kpis { display: grid; grid-template-columns: repeat(3,1fr); gap: .7rem; margin-bottom: 1.1rem; }
.kpi { background: #fff; border: 1px solid var(--slate-200); border-radius: var(--r-md); padding: .8rem; }
.kpi b { display: block; font-size: var(--text-xl); color: var(--ink-800); font-weight: 800; letter-spacing: -.02em; }
.kpi small { font-size: var(--text-xs); color: var(--slate-400); }
.kpi.warn b { color: var(--warn); }
.emp-table { background: #fff; border: 1px solid var(--slate-200); border-radius: var(--r-md); overflow: hidden; }
.emp-row { display: grid; grid-template-columns: 1.6fr 1fr 1fr auto; gap: .5rem; align-items: center; padding: .65rem .9rem; border-bottom: 1px solid var(--slate-100); font-size: var(--text-sm); }
.emp-row:last-child { border-bottom: 0; }
.emp-row.head { background: var(--slate-50); color: var(--slate-400); font-size: var(--text-xs); font-weight: 700; }
.emp-row .who { display: flex; align-items: center; gap: .55rem; font-weight: 600; color: var(--ink-700); }
.avatar { width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(135deg,var(--blue-300),var(--blue-600)); color: #fff; display: grid; place-items: center; font-size: 11px; font-weight: 800; flex: none; }
.pill { font-size: var(--text-xs); font-weight: 700; padding: .2rem .55rem; border-radius: 999px; justify-self: start; }
.pill.ok { color: var(--ok); background: var(--ok-bg); }
.pill.wait { color: var(--warn); background: var(--warn-bg); }
.pill.miss { color: var(--no); background: var(--no-bg); }
.mini-btn { font-size: var(--text-xs); font-weight: 700; color: var(--blue-600); background: var(--blue-50); border: 1px solid var(--blue-200); padding: .25rem .6rem; border-radius: 999px; }

/* ============================================================
   PROBLEM
   ============================================================ */
.problem { background: var(--ink-800); color: #fff; }
.problem .section-head h2 { color: #fff; }
.problem .section-head p { color: var(--slate-400); }
.problem-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.1rem; }
.pain {
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.10); border-radius: var(--r-lg);
  padding: 1.6rem; transition: transform var(--dur) var(--ease), border-color var(--dur);
}
.pain:hover { transform: translateY(-4px); border-color: rgba(147,197,253,.4); }
.pain .q { font-family: var(--font-mono); color: var(--blue-300); font-size: var(--text-sm); font-weight: 700; margin-bottom: .7rem; }
.pain h3 { font-size: var(--text-lg); margin-bottom: .5rem; color: #fff; }
.pain p { color: var(--slate-400); font-size: var(--text-sm); }
.problem-note { margin-top: 2.5rem; text-align: center; font-size: var(--text-lg); color: var(--slate-300); }
.problem-note b { color: var(--blue-300); }

/* ============================================================
   SOLUTION (do / don't)
   ============================================================ */
.sol-statement { font-size: var(--text-2xl); font-weight: 800; color: var(--ink-800); letter-spacing: -.02em; max-width: 760px; margin-bottom: 3rem; }
.sol-statement .hl { color: var(--blue-600); }
.do-dont { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.dd-card { border-radius: var(--r-lg); padding: 1.8rem; border: 1px solid var(--slate-200); }
.dd-card.do { background: linear-gradient(180deg, var(--blue-50), #fff); border-color: var(--blue-200); }
.dd-card.dont { background: var(--slate-50); }
.dd-card h3 { display: flex; align-items: center; gap: .6rem; font-size: var(--text-xl); margin-bottom: 1.2rem; }
.dd-tag { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: var(--text-lg); }
.do .dd-tag { background: var(--blue-500); color: #fff; }
.dont .dd-tag { background: var(--slate-300); color: var(--ink-700); }
.dd-list li { display: flex; gap: .7rem; padding: .6rem 0; border-bottom: 1px dashed var(--slate-200); font-size: var(--text-base); color: var(--slate-600); }
.dd-list li:last-child { border-bottom: 0; }
.dd-list li b { color: var(--ink-800); font-weight: 700; }
.dd-list .mark { flex: none; font-weight: 800; }
.do .mark { color: var(--ok); }
.dont .mark { color: var(--slate-400); }
.dont .dd-list li b { color: var(--slate-500); }
.dd-card.dont small { display: block; margin-top: 1.1rem; color: var(--slate-400); font-size: var(--text-sm); line-height: 1.6; }

/* ============================================================
   FEATURES (3 flavors)
   ============================================================ */
.flavor { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.flavor + .flavor { margin-top: var(--space-section); }
.flavor.rev .flavor-text { order: 2; }
.flavor-tag {
  display: inline-flex; align-items: center; gap: .5rem; font-family: var(--font-mono);
  font-size: var(--text-xs); font-weight: 700; letter-spacing: .08em;
  color: var(--blue-700); background: var(--blue-50); border: 1px solid var(--blue-200);
  padding: .35rem .8rem; border-radius: 999px; margin-bottom: 1.1rem;
}
.flavor-text h3 { font-size: var(--text-2xl); color: var(--ink-800); margin-bottom: .9rem; }
.flavor-text > p { color: var(--slate-600); font-size: var(--text-lg); margin-bottom: 1.4rem; }
.feat-list li { display: flex; gap: .7rem; align-items: flex-start; padding: .5rem 0; color: var(--slate-600); }
.feat-list .ck { flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--blue-50); color: var(--blue-600); display: grid; place-items: center; font-size: 13px; font-weight: 800; margin-top: .2rem; }
.feat-list b { color: var(--ink-800); }
.flavor-visual { display: flex; justify-content: center; }

/* tablet frame */
.tablet { width: 100%; max-width: 520px; background: #0b1220; border-radius: 26px; padding: 14px; box-shadow: var(--shadow-lg); }
.tablet-screen { background: var(--slate-50); border-radius: 14px; overflow: hidden; }
.tab-top { display: flex; align-items: center; justify-content: space-between; padding: .8rem 1.1rem; background: #fff; border-bottom: 1px solid var(--slate-200); }
.tab-loc { display: flex; align-items: center; gap: .5rem; font-weight: 800; color: var(--ink-800); font-size: var(--text-sm); }
.tab-loc .b { font-size: var(--text-xs); font-weight: 700; color: var(--blue-700); background: var(--blue-50); padding: .2rem .55rem; border-radius: 999px; }
.tab-clock { font-family: var(--font-mono); font-weight: 700; color: var(--ink-800); font-size: var(--text-xl); }
.tab-clock span { font-size: .8rem; color: var(--slate-400); }
.tab-body { display: grid; grid-template-columns: 1fr 44px; gap: .6rem; padding: 1rem; }
.tab-users { display: grid; grid-template-columns: repeat(3, 1fr); gap: .55rem; }
.tab-user { background: #fff; border: 1px solid var(--slate-200); border-radius: var(--r-md); padding: .7rem .5rem; text-align: center; }
.tab-user .avatar { margin: 0 auto .4rem; width: 30px; height: 30px; }
.tab-user .nm { font-size: var(--text-xs); font-weight: 700; color: var(--ink-700); }
.tab-user .st { font-size: 9px; font-weight: 700; margin-top: .3rem; padding: .12rem .4rem; border-radius: 999px; display: inline-block; }
.tab-user .st.in { color: var(--ok); background: var(--ok-bg); }
.tab-user .st.out { color: var(--slate-400); background: var(--slate-100); }
.aiueo { display: flex; flex-direction: column; gap: 3px; }
.aiueo span { flex: 1; display: grid; place-items: center; background: #fff; border: 1px solid var(--slate-200); border-radius: 6px; font-size: 11px; font-weight: 700; color: var(--slate-500); }
.aiueo span.on { background: var(--blue-500); color: #fff; border-color: var(--blue-500); }

/* ============================================================
   TECH STACK
   ============================================================ */
.tech { background: var(--slate-50); }
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; }
.tech-card {
  background: #fff; border: 1px solid var(--slate-200); border-radius: var(--r-lg);
  padding: 1.5rem; transition: transform var(--dur) var(--ease), box-shadow var(--dur);
}
.tech-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.tech-card .layer { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--blue-600); font-weight: 700; letter-spacing: .06em; margin-bottom: .9rem; }
.tech-card h4 { font-size: var(--text-lg); color: var(--ink-800); margin-bottom: .5rem; }
.tech-card p { font-size: var(--text-sm); color: var(--slate-500); }
.tech-card ul { margin-top: .8rem; }
.tech-card ul li { font-size: var(--text-sm); color: var(--slate-600); padding: .2rem 0 .2rem .9rem; position: relative; }
.tech-card ul li::before { content: ""; position: absolute; left: 0; top: .85rem; width: 4px; height: 4px; border-radius: 50%; background: var(--blue-300); }
.dep-row { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: .6rem; justify-content: center; }
.dep { font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 600; color: var(--slate-600); background: #fff; border: 1px solid var(--slate-200); padding: .45rem .9rem; border-radius: var(--r-sm); }
.dep b { color: var(--blue-600); }

/* ============================================================
   ARCHITECTURE
   ============================================================ */
.arch { background: var(--ink-900); color: #fff; }
.arch .section-head h2 { color: #fff; }
.arch .section-head p { color: var(--slate-400); }
.arch-diagram {
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.10); border-radius: var(--r-xl); padding: 2.2rem;
  margin-bottom: 2.5rem;
}
.arch-flavors { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; margin-bottom: 1.4rem; }
.arch-flavor { background: rgba(37,99,235,.14); border: 1px solid rgba(147,197,253,.3); border-radius: var(--r-md); padding: 1.1rem; text-align: center; }
.arch-flavor b { display: block; color: #fff; font-size: var(--text-base); }
.arch-flavor small { color: var(--blue-300); font-family: var(--font-mono); font-size: var(--text-xs); }
.arch-pipe { text-align: center; color: var(--slate-500); font-family: var(--font-mono); font-size: var(--text-sm); margin: .4rem 0; }
.arch-core { display: grid; grid-template-columns: repeat(2,1fr); gap: 1rem; }
.arch-box { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.12); border-radius: var(--r-md); padding: 1.1rem 1.2rem; }
.arch-box .t { display: flex; align-items: center; gap: .5rem; font-weight: 700; margin-bottom: .35rem; }
.arch-box .t span { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--blue-300); }
.arch-box p { color: var(--slate-400); font-size: var(--text-sm); }
.arch-points { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.1rem; }
.arch-point { display: flex; gap: 1rem; }
.arch-point .n { font-family: var(--font-mono); font-size: var(--text-xl); font-weight: 800; color: var(--blue-300); flex: none; }
.arch-point h4 { color: #fff; font-size: var(--text-base); margin-bottom: .3rem; }
.arch-point p { color: var(--slate-400); font-size: var(--text-sm); }

/* ============================================================
   CHALLENGES (developer notes)
   ============================================================ */
.chal-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.4rem; }
.chal {
  border: 1px solid var(--slate-200); border-radius: var(--r-lg); padding: 1.7rem;
  background: #fff; position: relative; overflow: hidden;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur);
}
.chal:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.chal::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(180deg, var(--blue-500), var(--blue-700)); }
.chal .tag { font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 700; color: var(--blue-600); letter-spacing: .06em; }
.chal h3 { font-size: var(--text-lg); color: var(--ink-800); margin: .5rem 0 .8rem; }
.chal .prob, .chal .sol { font-size: var(--text-sm); line-height: 1.7; }
.chal .prob { color: var(--slate-500); margin-bottom: .7rem; }
.chal .sol { color: var(--slate-700); }
.chal .sol b, .chal .prob b { color: var(--ink-800); font-weight: 700; }
.chal code { font-family: var(--font-mono); font-size: .8em; background: var(--blue-50); color: var(--blue-700); padding: .1rem .4rem; border-radius: 5px; }

/* ============================================================
   COMPARISON TABLE
   ============================================================ */
.cmp { background: var(--slate-50); }
.cmp-wrap { overflow-x: auto; border-radius: var(--r-lg); border: 1px solid var(--slate-200); box-shadow: var(--shadow-sm); }
table.cmp-table { width: 100%; border-collapse: collapse; background: #fff; min-width: 640px; }
.cmp-table th, .cmp-table td { padding: 1rem 1.1rem; text-align: center; border-bottom: 1px solid var(--slate-100); font-size: var(--text-sm); }
.cmp-table thead th { background: var(--ink-800); color: #fff; font-weight: 700; font-size: var(--text-sm); }
.cmp-table thead th.k { background: var(--blue-600); }
.cmp-table tbody th { text-align: left; font-weight: 700; color: var(--ink-700); background: var(--slate-50); white-space: nowrap; }
.cmp-table td.k { background: var(--blue-50); font-weight: 700; color: var(--blue-700); }
.cmp-table tbody tr:last-child td, .cmp-table tbody tr:last-child th { border-bottom: 0; }
.cmp-yes { color: var(--ok); font-weight: 800; }
.cmp-no { color: var(--slate-300); font-weight: 800; }
.cmp-note { margin-top: 1rem; font-size: var(--text-xs); color: var(--slate-400); text-align: center; }

/* ============================================================
   FOOTER
   ============================================================ */
.foot { background: var(--ink-900); color: var(--slate-400); padding-block: 3.5rem 2.5rem; }
.foot-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; flex-wrap: wrap; padding-bottom: 2.2rem; border-bottom: 1px solid rgba(255,255,255,.08); }
.foot-brand { max-width: 360px; }
.foot-brand .brand { color: #fff; margin-bottom: .9rem; }
.foot-brand .brand .tld { color: var(--slate-500); }
.foot-brand p { font-size: var(--text-sm); line-height: 1.7; }
.foot-meta { display: grid; grid-template-columns: repeat(2, auto); gap: 1.4rem 3rem; }
.foot-meta .label { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--slate-500); letter-spacing: .06em; margin-bottom: .35rem; }
.foot-meta .val { color: var(--slate-200); font-size: var(--text-sm); font-weight: 600; }
.foot-disc { margin-top: 2rem; font-size: var(--text-xs); line-height: 1.7; color: var(--slate-500); }
.foot-disc b { color: var(--slate-300); }
.foot-copy { margin-top: 1.5rem; font-size: var(--text-xs); color: var(--slate-600); }

/* ---------- Live Demo ---------- */
.demo { background:
    radial-gradient(120% 100% at 50% 0%, var(--blue-50) 0%, var(--white) 55%); }
.demo-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem;
  margin-top: .5rem;
}
.demo-card {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--slate-200); border-radius: var(--r-lg);
  padding: 1.8rem 1.6rem 1.6rem; box-shadow: var(--shadow-md);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.demo-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--blue-200); }
.demo-card.feat { border-color: var(--blue-300); box-shadow: var(--shadow-lg); }
.demo-flavor {
  font-family: var(--font-mono); font-size: var(--text-xs); font-weight: 700;
  letter-spacing: .08em; color: var(--blue-600);
  background: var(--blue-50); border: 1px solid var(--blue-100);
  padding: .25rem .6rem; border-radius: 999px; align-self: flex-start;
}
.demo-card h3 { font-size: var(--text-xl); margin: .9rem 0 .5rem; color: var(--ink-800); }
.demo-card h3 small { display: block; font-size: var(--text-xs); font-weight: 600; color: var(--slate-500); margin-top: .2rem; letter-spacing: 0; }
.demo-card > p { font-size: var(--text-sm); color: var(--slate-600); line-height: 1.7; }
.demo-cred {
  margin: 1.1rem 0 1.3rem; padding: .85rem 1rem;
  background: var(--slate-50); border: 1px solid var(--slate-200); border-radius: var(--r-md);
  display: grid; gap: .45rem;
}
.demo-cred div { display: flex; align-items: center; justify-content: space-between; gap: .8rem; }
.demo-cred span { font-size: var(--text-xs); color: var(--slate-500); font-weight: 600; }
.demo-cred code {
  font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 600;
  color: var(--ink-700); background: #fff; border: 1px solid var(--slate-200);
  padding: .15rem .55rem; border-radius: var(--r-sm);
}
.demo-launch { margin-top: auto; width: 100%; justify-content: center; }
.demo-note { margin-top: 1.6rem; text-align: center; font-size: var(--text-xs); color: var(--slate-500); line-height: 1.7; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-visual { order: -1; }
  .tech-grid { grid-template-columns: repeat(2,1fr); }
  .demo-grid { grid-template-columns: 1fr; max-width: 460px; margin-inline: auto; }
}
@media (max-width: 880px) {
  .nav-links { display: none; }
  .problem-grid { grid-template-columns: 1fr; }
  .do-dont { grid-template-columns: 1fr; }
  .flavor { grid-template-columns: 1fr; gap: 2rem; }
  .flavor.rev .flavor-text { order: 0; }
  .flavor-visual { order: -1; }
  .arch-core, .arch-points, .chal-grid { grid-template-columns: 1fr; }
  .arch-flavors { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  :root { --text-hero: clamp(2rem, 1.2rem + 5vw, 2.6rem); }
  .tech-grid { grid-template-columns: 1fr; }
  .trustbar .container { gap: 1.4rem; }
  .float-card { display: none; }
  .foot-top { flex-direction: column; }
  .foot-meta { grid-template-columns: 1fr 1fr; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; transition: none !important; }
}