/* ==========================================================================
   Howie Wang — portfolio
   Design language: quiet, typographic, Apple-inspired.
   ========================================================================== */

:root {
  /* Surfaces */
  --bg: #fbfbfd;
  --bg-alt: #f5f5f7;
  --bg-dark: #000000;
  --surface-dark: #1d1d1f;
  --surface-dark-2: #2a2a2d;

  /* Text */
  --text: #1d1d1f;
  --text-2: #6e6e73;
  --text-3: #86868b;
  --text-on-dark: #f5f5f7;
  --text-on-dark-2: #a1a1a6;
  --text-on-dark-3: #86868b;

  /* Accent — used functionally only */
  --accent: #0071e3;
  --accent-hover: #0077ed;

  /* Lines */
  --hairline: rgba(0, 0, 0, 0.09);
  --hairline-dark: rgba(255, 255, 255, 0.12);

  /* Shape */
  --r-xl: 28px;
  --r-lg: 20px;
  --r-md: 14px;
  --r-pill: 980px;

  /* Type */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;

  /* Layout */
  --nav-h: 52px;
  --w-narrow: 820px;
  --w-wide: 1180px;
  --gutter: 22px;

  /* Motion */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.011em;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
}

h1, h2, h3, h4, p, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
code { font-family: var(--mono); font-size: 0.92em; }
::selection { background: rgba(0, 113, 227, 0.18); }

:focus-visible {
  outline: 3px solid rgba(0, 113, 227, 0.6);
  outline-offset: 3px;
  border-radius: 6px;
}

.container { width: 100%; max-width: var(--w-wide); margin: 0 auto; padding: 0 var(--gutter); }
.container-narrow { width: 100%; max-width: var(--w-narrow); margin: 0 auto; padding: 0 var(--gutter); }

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
.eyebrow {
  font-size: 15px;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-3);
  margin-bottom: 18px;
}

.hero-title {
  /* 10.8vw keeps "The whole system." on one line from 320px phones up to desktop */
  font-size: clamp(34px, 10.8vw, 88px);
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -0.032em;
  color: var(--text);
}
.hero-title .muted { color: var(--text-3); }
/* Longer first line ("From first conversation") needs a gentler scale */
.hero-title--long { font-size: clamp(28px, 9vw, 84px); }

.hero-lead {
  margin: 28px auto 0;
  font-size: clamp(19px, 2.1vw, 23px);
  line-height: 1.42;
  letter-spacing: -0.012em;
  color: var(--text-2);
  max-width: 46ch;
  font-weight: 400;
}

.section-title {
  font-size: clamp(36px, 5.6vw, 64px);
  line-height: 1.06;
  font-weight: 700;
  letter-spacing: -0.028em;
  color: var(--text);
  text-wrap: balance;
}

.section-lead {
  margin-top: 22px;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.42;
  letter-spacing: -0.012em;
  color: var(--text-2);
  max-width: 56ch;
}

.meta-line {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  font-size: 14px;
  letter-spacing: 0;
  color: var(--text-3);
}
.meta-line span + span::before { content: "·"; margin: 0 12px; color: rgba(0, 0, 0, 0.25); }

/* --------------------------------------------------------------------------
   Buttons & links
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border-radius: var(--r-pill);
  background: var(--accent);
  color: #fff;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { background: var(--accent-hover); }
.btn:active { transform: scale(0.98); }
.btn-sm { padding: 6px 14px; font-size: 13px; font-weight: 500; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: var(--accent);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.01em;
  transition: gap 0.2s var(--ease);
}
.link-arrow::after {
  content: "›";
  font-size: 1.2em;
  line-height: 1;
  transform: translateY(-1px);
  transition: transform 0.2s var(--ease);
}
.link-arrow:hover { text-decoration: underline; text-underline-offset: 3px; }
.link-arrow:hover::after { transform: translate(2px, -1px); }

/* --------------------------------------------------------------------------
   Nav — frosted glass
   -------------------------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(251, 251, 253, 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.is-scrolled {
  border-bottom-color: var(--hairline);
  background: rgba(251, 251, 253, 0.82);
}
.nav-inner {
  max-width: var(--w-wide);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav-brand {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
}
.nav-links { display: flex; gap: 34px; }
.nav-links a {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: -0.005em;
  color: rgba(29, 29, 31, 0.82);
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  width: 36px; height: 36px;
  padding: 0;
  margin-right: -8px;
  border: 0;
  background: transparent;
  cursor: pointer;
  position: relative;
}
.nav-toggle span {
  position: absolute;
  left: 9px; right: 9px;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), top 0.3s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 14px; }
.nav-toggle span:nth-child(2) { top: 21px; }
body.nav-open .nav-toggle span:nth-child(1) { top: 17.5px; transform: rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { top: 17.5px; transform: rotate(-45deg); }

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0; bottom: 0;
  z-index: 99;
  overflow-y: auto;
  flex-direction: column;
  padding: 8px var(--gutter) 28px;
  background: rgba(251, 251, 253, 0.96);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
}
.nav-mobile a {
  padding: 15px 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--hairline);
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}
.nav-mobile a:last-child { border-bottom: 0; }
body.nav-open .nav-mobile { display: flex; }
body.nav-open .nav-mobile a { opacity: 1; transform: none; }
body.nav-open .nav-mobile a:nth-child(1) { transition-delay: 0.03s; }
body.nav-open .nav-mobile a:nth-child(2) { transition-delay: 0.06s; }
body.nav-open .nav-mobile a:nth-child(3) { transition-delay: 0.09s; }
body.nav-open .nav-mobile a:nth-child(4) { transition-delay: 0.12s; }
body.nav-open .nav-mobile a:nth-child(5) { transition-delay: 0.15s; }
body.nav-open .nav-mobile a:nth-child(6) { transition-delay: 0.18s; }
body.nav-open .nav-mobile a:nth-child(7) { transition-delay: 0.21s; }
body.nav-open .nav-mobile a:nth-child(8) { transition-delay: 0.24s; }
body.nav-open { overflow: hidden; }

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section { padding: 132px 0; }
.section-alt { background: var(--bg-alt); }

.section-dark {
  background: var(--bg-dark);
  color: var(--text-on-dark);
}
.section-dark .eyebrow { color: var(--text-on-dark-3); }
.section-dark .section-title { color: var(--text-on-dark); }
.section-dark .section-lead { color: var(--text-on-dark-2); }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  padding: calc(var(--nav-h) + 118px) 0 110px;
  text-align: center;
}
.hero .container-narrow { max-width: 900px; }
.hero-cta {
  margin-top: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
}

/* Stats */
.stats {
  margin-top: 118px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-top: 1px solid var(--hairline);
  text-align: center;
}
.stat {
  padding: 34px 18px 0;
  border-left: 1px solid var(--hairline);
}
.stat:first-child { border-left: 0; }
.stat-value {
  font-size: clamp(38px, 4.2vw, 56px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.035em;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.stat-label {
  margin: 12px auto 0;
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-2);
  letter-spacing: -0.005em;
  max-width: 17ch;
}
.stat-accent .stat-value { color: var(--accent); }

/* --------------------------------------------------------------------------
   Architecture diagram
   -------------------------------------------------------------------------- */
.arch {
  margin-top: 72px;
  padding: 44px 44px 48px;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: var(--r-xl);
  box-shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.18);
}
.arch-caption {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 28px;
}
.arch-row { display: grid; gap: 16px; }
.arch-row-3 { grid-template-columns: repeat(3, 1fr); }
.arch-row-4 { grid-template-columns: repeat(4, 1fr); }

.arch-node {
  background: var(--bg-alt);
  border-radius: var(--r-lg);
  padding: 24px 24px 26px;
  transition: transform 0.35s var(--ease-out), background 0.35s var(--ease);
}
.arch-node:hover { transform: translateY(-2px); background: #f0f0f3; }
.arch-node-kicker {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-3);
}
.arch-node-title {
  margin-top: 6px;
  font-size: 24px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.025em;
}
.arch-node-desc {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.45;
  color: var(--text-2);
}
.arch-node-sm .arch-node-desc { margin-top: 8px; font-size: 13.5px; }

.arch-node-core {
  background: var(--surface-dark);
  color: var(--text-on-dark);
  text-align: center;
  padding: 28px 40px 30px;
}
.arch-node-core:hover { background: #26262a; }
.arch-node-core .arch-node-kicker { color: var(--text-on-dark-3); }
.arch-node-core .arch-node-title { font-size: 28px; }
.arch-node-core .arch-node-desc { color: var(--text-on-dark-2); max-width: 72ch; margin-left: auto; margin-right: auto; }

.arch-link {
  position: relative;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.arch-link::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 50%;
  width: 1px;
  background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.22), transparent);
}
.arch-link span {
  position: relative;
  padding: 4px 12px;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: var(--r-pill);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--text-3);
}

/* --------------------------------------------------------------------------
   Bento (dark)
   -------------------------------------------------------------------------- */
.bento {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.tile {
  background: var(--surface-dark);
  border-radius: var(--r-xl);
  padding: 36px 36px 38px;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  position: relative;
  overflow: hidden;
  transition: background 0.35s var(--ease), transform 0.4s var(--ease-out);
}
.tile:hover { background: var(--surface-dark-2); transform: translateY(-3px); }
.tile-2 { grid-column: span 2; }
.tile-3 { grid-column: span 3; }
.tile-4 { grid-column: span 4; }

.tile-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 44px;
}
.tile-kicker {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-on-dark-3);
}
.tile-metric {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.01em;
  color: var(--text-on-dark-2);
  padding: 4px 10px;
  border: 1px solid var(--hairline-dark);
  border-radius: var(--r-pill);
}
.tile h3 {
  font-size: clamp(24px, 2.4vw, 30px);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-on-dark);
  text-wrap: balance;
}
.tile-4 h3 { font-size: clamp(28px, 3vw, 38px); max-width: 20ch; }
.tile p {
  margin-top: 14px;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--text-on-dark-2);
  letter-spacing: -0.005em;
}
.tile-4 p { max-width: 62ch; }
.tile code {
  font-size: 0.88em;
  color: var(--text-on-dark);
  background: rgba(255, 255, 255, 0.07);
  padding: 1px 6px;
  border-radius: 5px;
}

/* --------------------------------------------------------------------------
   Code — split layout
   -------------------------------------------------------------------------- */
.split {
  margin-top: 72px;
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 48px;
  align-items: center;
}
.split + .split { margin-top: 96px; }
.split-reverse { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.split-reverse .split-text { order: 2; }
.split-reverse .code-window { order: 1; }

.split-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 14px;
}
.split-text h3 {
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.028em;
  text-wrap: balance;
}
.split-text p {
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--text-2);
}

.code-window {
  background: var(--surface-dark);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.45);
  min-width: 0;
}
.code-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 16px;
  background: #2a2a2d;
}
.code-bar span { width: 11px; height: 11px; border-radius: 50%; background: rgba(255, 255, 255, 0.16); }
.code-bar em {
  margin-left: 8px;
  font-family: var(--mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.01em;
  color: var(--text-on-dark-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.code-window pre {
  margin: 0;
  padding: 22px 24px 26px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.65;
  color: #d6d6db;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}
.code-window code { font-family: inherit; font-size: inherit; }
.code-window .c { color: #7d7d85; }
.code-window .k { color: #c7a5ff; }
.code-window .s { color: #a5d6a7; }
.code-window .n { color: #f6c177; }
.code-window .b { color: #f6c177; }
.code-window .f { color: #8fd3ff; }

/* --------------------------------------------------------------------------
   Sub-project cards & pipeline
   -------------------------------------------------------------------------- */
.cards-3 {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card {
  background: #fff;
  border-radius: var(--r-xl);
  padding: 34px 34px 36px;
  border: 1px solid var(--hairline);
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease);
}
.card:hover { transform: translateY(-3px); box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.25); }
.card-num {
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.035em;
  font-variant-numeric: tabular-nums;
}
.card h3 {
  margin-top: 6px;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-2);
}
.card p {
  margin-top: 18px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-2);
}

.pipeline {
  margin-top: 16px;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: var(--r-xl);
  padding: 34px 40px 36px;
}
.pipeline-caption {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 28px;
}
.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  counter-reset: step;
}
.pipeline-steps li {
  position: relative;
  padding-right: 28px;
}
.pipeline-steps li::before {
  content: "";
  display: block;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text);
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}
.pipeline-steps li::after {
  content: "";
  position: absolute;
  top: 4.5px; left: 10px; right: 0;
  height: 1px;
  background: var(--hairline);
}
.pipeline-steps li:last-child::after { display: none; }
.pipeline-steps li:last-child::before { background: var(--accent); }
.pipeline-step {
  display: block;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.pipeline-desc {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--text-2);
}

/* --------------------------------------------------------------------------
   Decisions (problem / decision / result cards)
   -------------------------------------------------------------------------- */
.cards-2 {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.decision {
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: var(--r-xl);
  padding: 36px 36px 34px;
  transition: transform 0.4s var(--ease-out), box-shadow 0.4s var(--ease);
}
.decision:hover { transform: translateY(-3px); box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.25); }
.decision-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 14px;
}
.decision h3 {
  font-size: clamp(22px, 2.2vw, 27px);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.024em;
  text-wrap: balance;
}
.decision dl {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 14px 18px;
}
.decision dt {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-3);
  padding-top: 2px;
}
.decision dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-2);
}
.decision dd:last-of-type { color: var(--text); }

/* Phases variant of the pipeline: sits above the architecture card */
.pipeline-phases { margin-top: 72px; }
.pipeline-phases + .arch { margin-top: 16px; }
.pipeline-phases .pipeline-steps li::before { background: var(--text-3); }
.pipeline-phases .pipeline-steps li:last-child::before { background: var(--accent); }

/* Technical foundation strip */
.section-foundation { padding-bottom: 112px; }
.section-foundation .hero-cta { margin-top: 26px; justify-content: flex-start; }
.stack-line {
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0;
  color: var(--text-3);
}

/* --------------------------------------------------------------------------
   Skills
   -------------------------------------------------------------------------- */
.skills {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 48px;
  border-top: 1px solid var(--hairline);
}
.skill-group {
  padding: 30px 0 38px;
  border-bottom: 1px solid var(--hairline);
}
.skill-group h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.skill-group p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text-2);
}

/* --------------------------------------------------------------------------
   Process (dark)
   -------------------------------------------------------------------------- */
.process {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 48px;
  border-top: 1px solid var(--hairline-dark);
}
.process li {
  padding: 32px 0 40px;
  border-bottom: 1px solid var(--hairline-dark);
}
.process-num {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-on-dark-3);
}
.process h3 {
  margin-top: 16px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-on-dark);
}
.process p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.52;
  color: var(--text-on-dark-2);
}

/* --------------------------------------------------------------------------
   Contact & footer
   -------------------------------------------------------------------------- */
.section-contact { padding: 150px 0 140px; text-align: center; }
.section-contact .section-lead { margin-left: auto; margin-right: auto; }
.contact-actions {
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px 32px;
  flex-wrap: wrap;
}

.footer {
  border-top: 1px solid var(--hairline);
  padding: 22px 0 max(22px, env(safe-area-inset-bottom));
  font-size: 12px;
  color: var(--text-3);
  letter-spacing: 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Inline icons (sprite <symbol>s referenced with <use>)
   -------------------------------------------------------------------------- */
.tile-icon svg, .decision-icon svg, .shift-arrow svg, .more-icon svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* --------------------------------------------------------------------------
   Device frames — real product shots
   -------------------------------------------------------------------------- */
.device { position: relative; }
.device img { width: 100%; height: auto; }

.device-browser {
  background: var(--surface-dark);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 50px 100px -40px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(0, 0, 0, 0.06);
}
.device-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: #2a2a2d;
}
.device-bar span { width: 11px; height: 11px; border-radius: 50%; background: rgba(255, 255, 255, 0.16); }
.device-bar em {
  margin-left: 8px;
  font-family: var(--mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.01em;
  color: var(--text-on-dark-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-phone {
  width: 100%;
  max-width: 300px;
  padding: 10px;
  background: var(--surface-dark);
  border-radius: 46px;
  box-shadow: 0 50px 100px -40px rgba(0, 0, 0, 0.45), inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}
.device-phone img { border-radius: 36px; }

/* Hero product shot */
.hero-shot { margin-top: 84px; }
.hero-shot .device-browser { max-width: 1100px; margin: 0 auto; }
.hero-shot figcaption {
  margin: 24px auto 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-3);
}
.hero-shot + .stats { margin-top: 96px; }

/* Shots slide in a touch slower and settle from a slight scale */
.reveal-shot { transform: translateY(34px) scale(0.985); transition-duration: 1.1s; }
.reveal-shot.is-visible { transform: none; }

/* --------------------------------------------------------------------------
   Bento — lite variant: icon + kicker + one line
   -------------------------------------------------------------------------- */
.bento-lite .tile { min-height: 0; padding: 30px 32px 32px; }
.bento-lite .tile-top { align-items: center; padding-bottom: 30px; }
.bento-lite .tile-kicker { display: block; margin-bottom: 10px; }
.bento-lite .tile h3 { font-size: clamp(22px, 2.1vw, 27px); }
.bento-lite .tile-4 h3 { font-size: clamp(26px, 2.6vw, 34px); max-width: 22ch; }
.bento-lite .tile p { margin-top: 12px; font-size: 15px; line-height: 1.5; }
.bento-lite .tile-4 p { max-width: 56ch; }

.tile-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  display: grid;
  place-items: center;
  color: var(--text-on-dark);
  flex: none;
}
.tile-icon svg { width: 22px; height: 22px; }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.chips li {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--text-on-dark);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--hairline-dark);
  padding: 6px 12px;
  border-radius: var(--r-pill);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   Decisions — before → after, with the full story folded away
   -------------------------------------------------------------------------- */
.decision-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.decision-head .decision-kicker { margin-bottom: 0; }
.decision-icon {
  width: 36px; height: 36px;
  border-radius: 11px;
  background: var(--bg-alt);
  display: grid;
  place-items: center;
  color: var(--text);
  flex: none;
}
.decision-icon svg { width: 20px; height: 20px; }

.shift {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}
.shift-label {
  display: block;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 8px;
}
.shift-after .shift-label { color: var(--accent); }
.shift-col p { font-size: 15px; line-height: 1.45; color: var(--text-2); }
.shift-after p { color: var(--text); font-weight: 500; }
.shift-arrow { display: grid; place-items: center; padding-top: 24px; color: var(--text-3); }
.shift-arrow svg {
  width: 22px; height: 22px;
  opacity: 0;
  transform: translateX(-8px);
  transition: transform 0.8s var(--ease-out) 0.4s, opacity 0.8s var(--ease-out) 0.4s;
}
.reveal.is-visible .shift-arrow svg { opacity: 1; transform: none; }

.more { margin-top: 22px; border-top: 1px solid var(--hairline); padding-top: 14px; }
.more summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  user-select: none;
  -webkit-user-select: none;
}
.more summary::-webkit-details-marker { display: none; }
.more-icon {
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1px solid rgba(0, 113, 227, 0.35);
  display: grid;
  place-items: center;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}
.more-icon svg { width: 12px; height: 12px; stroke-width: 2; }
.more[open] .more-icon { transform: rotate(45deg); background: rgba(0, 113, 227, 0.08); }
.more dl { margin-top: 16px; }

/* --------------------------------------------------------------------------
   Showcase — phone + dashboard, and a facts strip
   -------------------------------------------------------------------------- */
.showcase {
  margin-top: 72px;
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  gap: 40px;
  align-items: end;
}
.showcase figure { margin: 0; min-width: 0; }
.showcase figcaption { margin-top: 18px; font-size: 14px; line-height: 1.45; color: var(--text-3); }
.showcase-phone { display: flex; flex-direction: column; align-items: center; text-align: center; }

.facts {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 40px;
  border-top: 1px solid var(--hairline);
}
.facts li { padding: 28px 0 8px; }
.fact-num {
  display: block;
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.fact-text { display: block; margin-top: 10px; font-size: 15px; line-height: 1.5; color: var(--text-2); }

/* --------------------------------------------------------------------------
   Motion — reveal on scroll
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  will-change: opacity, transform;
}
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }
.reveal[data-delay="4"] { transition-delay: 0.36s; }
.reveal.is-visible { opacity: 1; transform: none; }

/* Pipeline: steps and their connecting line appear one after another */
.pipeline.reveal .pipeline-steps li {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.pipeline.reveal .pipeline-steps li::after {
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.8s var(--ease-out);
}
.pipeline.reveal.is-visible .pipeline-steps li,
.pipeline.reveal.is-visible .pipeline-steps li::after { opacity: 1; transform: none; }
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(1)::after { transition-delay: 0.15s; }
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(2),
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(2)::after { transition-delay: 0.3s; }
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(3),
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(3)::after { transition-delay: 0.5s; }
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(4),
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(4)::after { transition-delay: 0.7s; }
.pipeline.reveal.is-visible .pipeline-steps li:nth-child(5) { transition-delay: 0.9s; }

/* Architecture: a quiet pulse travels down each connector */
.arch-link::after {
  content: "";
  position: absolute;
  left: 50%;
  top: -3px;
  width: 6px; height: 6px;
  margin-left: -3px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.14);
  opacity: 0;
  animation: arch-pulse 2.8s var(--ease) infinite;
}
.arch-link + .arch-row + .arch-link::after { animation-delay: 1.4s; }
@keyframes arch-pulse {
  0%   { top: -3px; opacity: 0; }
  18%  { opacity: 1; }
  82%  { opacity: 1; }
  100% { top: calc(100% - 3px); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .arch-link::after { display: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1068px) {
  .section { padding: 104px 0; }
  .hero { padding-top: calc(var(--nav-h) + 92px); }

  .stats { grid-template-columns: repeat(3, 1fr); }
  .stat { padding-top: 30px; padding-bottom: 10px; }
  .stat:nth-child(3n + 1) { border-left: 0; }

  .arch { padding: 34px 30px 36px; }
  .arch-row-4 { grid-template-columns: repeat(2, 1fr); }

  .tile { padding: 30px 30px 32px; min-height: 260px; }
  .tile-2 { grid-column: span 3; }
  .tile-4 { grid-column: span 6; }
  .tile-3 { grid-column: span 3; }

  .split, .split-reverse { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .split-reverse .split-text { order: 1; }
  .split-reverse .code-window { order: 2; }

  .cards-3 { grid-template-columns: 1fr; }
  .cards-2 { grid-template-columns: 1fr; }
  .decision { padding: 30px 30px 28px; }
  .pipeline-steps { grid-template-columns: repeat(5, 1fr); }

  .skills { grid-template-columns: repeat(2, 1fr); gap: 0 32px; }
  .process { grid-template-columns: repeat(2, 1fr); gap: 0 32px; }

  .hero-shot { margin-top: 64px; }
  .showcase { grid-template-columns: minmax(0, 240px) minmax(0, 1fr); gap: 28px; }
  .facts { gap: 0 28px; }
  .bento-lite .tile { padding: 26px 26px 28px; }
}

@media (max-width: 734px) {
  :root { --gutter: 18px; --nav-h: 48px; }

  .nav-links { display: none; }
  .nav-toggle { display: block; }
  .nav-actions .btn-sm { display: none; }

  .section { padding: 84px 0; }
  .hero { padding: calc(var(--nav-h) + 72px) 0 80px; }
  .hero-lead { margin-top: 22px; }
  .hero-cta { margin-top: 32px; gap: 20px; }

  .stats { margin-top: 80px; grid-template-columns: repeat(2, 1fr); }
  .stat { border-left: 0; padding: 26px 12px 8px; }
  .stat:nth-child(2n) { border-left: 1px solid var(--hairline); }
  .stat-label { font-size: 13px; }

  .section-lead { margin-top: 16px; }
  .meta-line { margin-top: 20px; flex-direction: column; gap: 4px; }
  .meta-line span + span::before { content: none; }

  .arch { margin-top: 48px; padding: 24px 18px 26px; border-radius: 22px; }
  .arch-row-3, .arch-row-4 { grid-template-columns: 1fr; }
  .arch-row { gap: 12px; }
  .arch-node { padding: 20px 20px 22px; }
  .arch-node-core { padding: 22px 20px 24px; text-align: left; }
  .arch-node-core .arch-node-desc { margin-left: 0; }
  .arch-node-core .arch-node-title { font-size: 22px; }
  .arch-link { height: 48px; }

  .bento { margin-top: 48px; gap: 12px; }
  .tile, .tile-2, .tile-3, .tile-4 { grid-column: span 6; }
  .tile { min-height: 0; padding: 26px 24px 28px; border-radius: 22px; }
  .tile-top { padding-bottom: 26px; }
  .tile-4 h3 { font-size: 26px; }

  .split { margin-top: 48px; gap: 24px; }
  .split + .split { margin-top: 64px; }
  .code-window pre { padding: 18px 18px 22px; font-size: 11.5px; }

  .cards-3 { margin-top: 48px; gap: 12px; }
  .card { padding: 26px 24px 28px; border-radius: 22px; }
  .cards-2 { margin-top: 48px; gap: 12px; }
  .decision { padding: 26px 22px 26px; border-radius: 22px; }
  .decision dl { grid-template-columns: 1fr; gap: 6px; margin-top: 20px; }
  .decision dd { margin-bottom: 8px; }
  .pipeline-phases { margin-top: 48px; }
  .pipeline-phases + .arch { margin-top: 12px; }
  .pipeline { padding: 24px 22px 26px; border-radius: 22px; margin-top: 12px; }
  .pipeline-steps { grid-template-columns: 1fr; gap: 0; }
  .pipeline-steps li { padding: 0 0 22px 26px; }
  .pipeline-steps li::before { position: absolute; left: 0; top: 5px; margin: 0; }
  .pipeline-steps li::after { top: 14px; bottom: -6px; left: 4.5px; right: auto; width: 1px; height: auto; }
  .pipeline.reveal .pipeline-steps li::after { transform: scaleY(0); transform-origin: center top; }
  .pipeline.reveal.is-visible .pipeline-steps li::after { transform: none; }

  .hero-shot { margin-top: 52px; }
  .hero-shot figcaption { margin-top: 16px; font-size: 13px; }
  .hero-shot + .stats { margin-top: 64px; }
  .device-browser { border-radius: 12px; }
  .device-bar { padding: 9px 12px; gap: 6px; }
  .device-bar span { width: 8px; height: 8px; }
  .device-bar em { font-size: 11px; }

  .bento-lite .tile { padding: 24px 22px 26px; }
  .bento-lite .tile-top { padding-bottom: 22px; }
  .bento-lite .tile h3, .bento-lite .tile-4 h3 { font-size: 23px; }
  .chips { gap: 6px; margin-top: 14px; }
  .chips li { font-size: 12px; padding: 5px 10px; }

  .shift { grid-template-columns: 1fr; gap: 12px; margin-top: 20px; }
  .shift-arrow { padding: 0; justify-content: start; justify-items: start; }
  .shift-arrow svg { transform: rotate(90deg) translateX(-8px); }
  .reveal.is-visible .shift-arrow svg { transform: rotate(90deg); }

  .showcase { margin-top: 44px; grid-template-columns: 1fr; gap: 32px; }
  .showcase-phone .device-phone { max-width: 250px; border-radius: 40px; padding: 8px; }
  .showcase-phone .device-phone img { border-radius: 32px; }
  .facts { margin-top: 40px; grid-template-columns: 1fr; }
  .facts li { padding: 20px 0 6px; border-bottom: 1px solid var(--hairline); }
  .facts li:last-child { border-bottom: 0; }
  .fact-num { font-size: 30px; }

  .skills { margin-top: 44px; grid-template-columns: 1fr; }
  .skill-group { padding: 24px 0 28px; }

  .process { margin-top: 48px; grid-template-columns: 1fr; }
  .process li { padding: 26px 0 30px; }

  .section-contact { padding: 100px 0 90px; }
  .contact-actions { flex-direction: column; gap: 22px; }
  .footer-inner { flex-direction: column; gap: 8px; }
}