/* ─────────────────────────────────────────────
   Autonomy — AI Agent Framework Design System
   Author: Bill Liu
   ─────────────────────────────────────────────── */

/* ── 1. CSS Custom Properties ── */
:root {
  /* Color palette */
  --clr-bg:          hsl(240, 25%, 4%);
  --clr-bg-2:        hsl(240, 20%, 6%);
  --clr-bg-card:     hsl(240, 20%, 8%);
  --clr-surface:     hsl(240, 15%, 10%);
  --clr-border:      hsl(240, 15%, 18%);

  --clr-cyan:        hsl(195, 100%, 50%);
  --clr-cyan-dim:    hsl(195, 80%, 30%);
  --clr-purple:      hsl(258, 79%, 58%);
  --clr-purple-dim:  hsl(258, 60%, 25%);
  --clr-blue:        hsl(218, 90%, 60%);
  --clr-teal:        hsl(172, 66%, 50%);
  --clr-pink:        hsl(322, 80%, 60%);

  --clr-text:        hsl(220, 20%, 98%);
  --clr-text-muted:  hsl(220, 15%, 80%);
  --clr-text-faint:  hsl(220, 10%, 60%);

  /* Gradients */
  --grad-primary:    linear-gradient(135deg, var(--clr-cyan) 0%, var(--clr-purple) 100%);
  --grad-hero:       radial-gradient(ellipse 80% 60% at 50% -10%, hsl(258, 60%, 20%) 0%, transparent 70%),
                     radial-gradient(ellipse 50% 40% at 80% 100%, hsl(195, 80%, 15%) 0%, transparent 60%),
                     var(--clr-bg);

  /* Typography */
  --font-sans:   'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-gap: clamp(5rem, 10vw, 9rem);
  --container:   min(90rem, 100% - 3rem);

  /* Transitions */
  --ease-out-expo:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring:     cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Borders */
  --radius-sm:   0.5rem;
  --radius-md:   1rem;
  --radius-lg:   1.5rem;
  --radius-xl:   2rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-glow-cyan:   0 0 40px hsl(195, 100%, 50%, 0.15);
  --shadow-glow-purple: 0 0 40px hsl(258, 79%, 58%, 0.15);
  --shadow-card:        0 4px 32px hsl(240, 25%, 2%, 0.6);
}

/* ── 2. Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
svg { flex-shrink: 0; }

/* ── 3. Container ── */
.container {
  width: var(--container);
  margin-inline: auto;
}

/* ── 4. Section base ── */
.section {
  padding-block: var(--section-gap);
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-cyan);
  background: hsl(195, 100%, 50%, 0.08);
  border: 1px solid hsl(195, 100%, 50%, 0.2);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--clr-text-muted);
  max-width: 54ch;
  margin-inline: auto;
}

/* ── 5. Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-full);
  transition: transform 0.2s var(--ease-spring), box-shadow 0.25s ease, background 0.25s ease, opacity 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: white;
  opacity: 0;
  transition: opacity 0.2s ease;
  border-radius: inherit;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn:hover::before { opacity: 0.05; }

.btn--sm { padding: 0.5rem 1.125rem; font-size: 0.875rem; }
.btn--lg { padding: 0.9rem 2rem; font-size: 1rem; }

.btn--primary {
  background: var(--grad-primary);
  color: hsl(0, 0%, 100%);
  box-shadow: 0 4px 20px hsl(258, 79%, 58%, 0.3);
}

.btn--primary:hover {
  box-shadow: 0 8px 32px hsl(258, 79%, 58%, 0.45);
}

.btn--outline {
  background: transparent;
  color: var(--clr-text);
  border: 1px solid var(--clr-border);
}

.btn--outline:hover {
  border-color: var(--clr-cyan);
  color: var(--clr-cyan);
}

.btn--ghost {
  background: hsl(240, 20%, 100%, 0.06);
  color: var(--clr-text);
  border: 1px solid var(--clr-border);
  backdrop-filter: blur(8px);
}

.btn--ghost:hover {
  background: hsl(240, 20%, 100%, 0.1);
  border-color: hsl(240, 20%, 100%, 0.25);
}

/* ── 6. Pills & Tags ── */
.pill {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.9625rem;
  font-weight: 500;
}

.pill--cyan   { background: hsl(195, 100%, 50%, 0.1); color: var(--clr-cyan);   border: 1px solid hsl(195, 100%, 50%, 0.25); }
.pill--purple { background: hsl(258, 79%, 58%, 0.1);  color: var(--clr-purple); border: 1px solid hsl(258, 79%, 58%, 0.25); }
.pill--blue   { background: hsl(218, 90%, 60%, 0.1);  color: var(--clr-blue);   border: 1px solid hsl(218, 90%, 60%, 0.25); }
.pill--teal   { background: hsl(172, 66%, 50%, 0.1);  color: var(--clr-teal);   border: 1px solid hsl(172, 66%, 50%, 0.25); }
.pill--pink   { background: hsl(322, 80%, 60%, 0.1);  color: var(--clr-pink);   border: 1px solid hsl(322, 80%, 60%, 0.25); }

.tag {
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: hsl(240, 20%, 100%, 0.06);
  color: var(--clr-text-muted);
  border: 1px solid var(--clr-border);
}

/* ── 7. NAV ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
}

.nav.scrolled {
  background: hsl(240, 25%, 4%, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--clr-border);
}

.nav__inner {
  width: var(--container);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--clr-text);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-icon {
  font-size: 1.4rem;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__logo-accent {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__links {
  display: flex;
  gap: 0.25rem;
  margin-left: auto;
}

.nav__link {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: color 0.2s, background 0.2s;
}

.nav__link:hover {
  color: var(--clr-text);
  background: hsl(240, 20%, 100%, 0.05);
}

.nav__cta { margin-left: 0.75rem; }

/* ── Language Toggle ── */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--clr-border);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, color 0.2s, box-shadow 0.2s;
  margin-left: auto;
  user-select: none;
}

.lang-toggle:hover {
  border-color: hsl(195, 100%, 50%, 0.45);
  background: hsl(195, 100%, 50%, 0.05);
  box-shadow: 0 0 12px hsl(195, 100%, 50%, 0.15);
  color: var(--clr-text);
}

.lang-toggle:focus-visible {
  outline: 2px solid var(--clr-cyan);
  outline-offset: 3px;
}

.lang-toggle__sep {
  opacity: 0.3;
  font-weight: 400;
}

.lang-toggle__zh,
.lang-toggle__en {
  transition: color 0.2s;
  color: var(--clr-text-faint);
}

.lang-toggle__active {
  color: var(--clr-cyan) !important;
  text-shadow: 0 0 10px hsl(195, 100%, 50%, 0.6);
}



/* ── 8. HERO ── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--grad-hero);
  padding-block: 8rem 4rem;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url('ai_network_bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  z-index: 0;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 72rem;
  padding-inline: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.75rem;
}

/* Badge */
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1px solid hsl(195, 100%, 50%, 0.3);
  background: hsl(195, 100%, 50%, 0.06);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-cyan);
  letter-spacing: 0.04em;
  animation: fadeSlideDown 0.8s var(--ease-out-expo) both;
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-cyan);
  box-shadow: 0 0 8px var(--clr-cyan);
  animation: pulse 2s ease-in-out infinite;
}

/* Title */
.hero__title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--clr-text);
}

.hero__title-line--1 { animation: fadeSlideUp 0.9s 0.1s var(--ease-out-expo) both; }
.hero__title-line--2 { animation: fadeSlideUp 0.9s 0.2s var(--ease-out-expo) both; }
.hero__title-line--3 { animation: fadeSlideUp 0.9s 0.3s var(--ease-out-expo) both; }

.hero__title-gradient {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 40px hsl(195, 100%, 50%, 0.3));
}

/* Subtitle */
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--clr-text-muted);
  max-width: 55ch;
  line-height: 1.7;
  animation: fadeSlideUp 1s 0.4s var(--ease-out-expo) both;
}

.hero__subtitle strong { color: var(--clr-text); font-weight: 600; }

/* CTA group */
.hero__cta-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  animation: fadeSlideUp 1s 0.5s var(--ease-out-expo) both;
}

/* Stats */
.hero__stats {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  padding: 1.5rem 2.5rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
  background: hsl(240, 20%, 100%, 0.03);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  animation: fadeSlideUp 1s 0.6s var(--ease-out-expo) both;
}

.hero__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.hero__stat-value {
  font-size: 1.875rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-variant-numeric: tabular-nums;
}

.hero__stat-unit {
  font-size: 1rem;
  font-weight: 700;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__stat-label {
  font-size: 0.9rem;
  color: var(--clr-text-faint);
  font-weight: 500;
}

.hero__stat-divider {
  width: 1px;
  height: 3rem;
  background: var(--clr-border);
}

/* Scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 2;
  animation: fadeSlideUp 1s 1s var(--ease-out-expo) both;
}

.hero__scroll-text {
  font-size: 0.9rem;
  color: var(--clr-text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--clr-text-faint);
  border-bottom: 2px solid var(--clr-text-faint);
  transform: rotate(45deg);
  animation: scrollBounce 1.5s ease-in-out infinite;
}

/* ── 9. ABOUT ── */
.about {
  background: linear-gradient(180deg, var(--clr-bg) 0%, var(--clr-bg-2) 100%);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about__lead {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.65;
  color: var(--clr-text);
  margin-bottom: 1.25rem;
}

.about__lead mark {
  background: none;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about__body {
  color: var(--clr-text-muted);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.about__pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

/* Agent loop diagram */
.agent-loop {
  position: relative;
  width: 300px;
  height: 300px;
  margin: auto;
}

.agent-loop__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.agent-loop__center {
  position: absolute;
  inset: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: hsl(240, 20%, 8%);
  border: 1px solid hsl(195, 100%, 50%, 0.3);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-cyan);
  box-shadow: 0 0 30px hsl(195, 100%, 50%, 0.15), inset 0 0 20px hsl(195, 100%, 50%, 0.05);
  z-index: 2;
}

.agent-loop__center span:first-child { font-size: 1.5rem; }

.agent-loop__node {
  position: absolute;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: hsl(240, 20%, 8%);
  border: 1px solid var(--clr-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  z-index: 2;
  transition: border-color 0.3s, color 0.3s, box-shadow 0.3s;
}

.agent-loop__node:hover {
  border-color: var(--clr-cyan);
  color: var(--clr-cyan);
  box-shadow: 0 0 20px hsl(195, 100%, 50%, 0.2);
}

.agent-loop__node-icon { font-size: 1.1rem; }

.agent-loop__node--top  { top: 0;         left: 50%;        transform: translate(-50%, 0); }
.agent-loop__node--right { bottom: 10px;  right: 0;         transform: translate(0, 0); }
.agent-loop__node--left  { bottom: 10px;  left: 0;          transform: translate(0, 0); }

/* ── 10. FEATURES ── */
.features {
  background: var(--clr-bg-2);
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, hsl(258, 60%, 15%, 0.4) 0%, transparent 70%);
  pointer-events: none;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  position: relative;
}

.feature-card {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.3s var(--ease-spring), border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: var(--grad-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: hsl(195, 100%, 50%, 0.3);
  box-shadow: 0 16px 48px hsl(240, 25%, 2%, 0.6), var(--shadow-glow-cyan);
}

.feature-card:hover::before { opacity: 1; }

.feature-card__icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: hsl(240, 20%, 100%, 0.04);
  border: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, border-color 0.3s;
}

.feature-card:hover .feature-card__icon-wrap {
  background: hsl(195, 100%, 50%, 0.08);
  border-color: hsl(195, 100%, 50%, 0.2);
}

.feature-card__icon { font-size: 1.5rem; }

.feature-card__title {
  font-size: 1.075rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.01em;
}

.feature-card__desc {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
  flex: 1;
}

.feature-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* ── 11. ARCHITECTURE ── */
.architecture {
  background: var(--clr-bg);
}

.arch__diagram {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 3rem;
  overflow: hidden;
}

.arch__layer {
  position: relative;
}

.arch__layer-label {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  margin-bottom: 0.75rem;
}

.arch__node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  text-align: center;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.arch__node:hover {
  border-color: hsl(195, 100%, 50%, 0.4);
  box-shadow: var(--shadow-glow-cyan);
}

.arch__node-icon { font-size: 1.75rem; }
.arch__node-title { font-size: 0.95rem; font-weight: 700; color: var(--clr-text); }
.arch__node-sub { font-size: 0.9rem; color: var(--clr-text-faint); }

.arch__node--main {
  max-width: 380px;
  margin: 0 auto;
  background: linear-gradient(135deg, hsl(195, 100%, 50%, 0.06) 0%, hsl(258, 79%, 58%, 0.06) 100%);
  border-color: hsl(195, 100%, 50%, 0.25);
}

.arch__arrows { padding-block: 0.25rem; }
.arch__arrows-svg { width: 100%; height: 60px; display: block; }

.arch__workers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.arch__tools-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.arch__tool-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-full);
  background: hsl(240, 20%, 100%, 0.04);
  border: 1px solid var(--clr-border);
  font-size: 0.9625rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  cursor: default;
}

.arch__tool-chip:hover {
  background: hsl(195, 100%, 50%, 0.08);
  border-color: hsl(195, 100%, 50%, 0.25);
  color: var(--clr-cyan);
}

/* Tech Stack */
.tech-stack {
  text-align: center;
}

.tech-stack__title {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  margin-bottom: 1.5rem;
}

.tech-stack__grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.tech-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  transition: all 0.25s var(--ease-spring);
}

.tech-item:hover {
  background: hsl(258, 79%, 58%, 0.08);
  border-color: hsl(258, 79%, 58%, 0.3);
  color: var(--clr-purple);
  transform: translateY(-3px);
}

.tech-item__icon { font-size: 1.1rem; }

/* ── 12. TERMINAL ── */
.demo {
  background: var(--clr-bg-2);
}

.terminal {
  background: hsl(240, 30%, 3%);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card), 0 0 0 1px hsl(240, 20%, 100%, 0.03);
  max-width: 860px;
  margin: 0 auto;
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.25rem;
  background: hsl(240, 25%, 5%);
  border-bottom: 1px solid var(--clr-border);
}

.terminal__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal__dot--red    { background: hsl(5, 85%, 60%); }
.terminal__dot--yellow { background: hsl(40, 90%, 60%); }
.terminal__dot--green  { background: hsl(142, 70%, 50%); }

.terminal__title {
  margin-left: 0.75rem;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  color: var(--clr-text-faint);
}

.terminal__body {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  min-height: 320px;
  color: hsl(142, 70%, 65%);
}

.terminal__line {
  display: block;
}

.terminal__line--cmd {
  color: var(--clr-cyan);
}

.terminal__line--out {
  color: hsl(142, 60%, 60%);
}

.terminal__line--warn {
  color: hsl(40, 90%, 65%);
}

.terminal__line--info {
  color: var(--clr-text-muted);
}

.terminal__line--done {
  color: hsl(142, 70%, 55%);
  font-weight: 700;
}

.terminal__line--learn {
  color: hsl(258, 79%, 72%);
  font-style: italic;
}

.terminal__cursor {
  display: inline-block;
  width: 8px;
  height: 1em;
  background: var(--clr-cyan);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

/* ── 13. AUTHOR ── */
.author {
  background: var(--clr-bg);
  position: relative;
}

.author::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 60% at 50% 50%, hsl(258, 60%, 15%, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.author__card {
  display: flex;
  gap: 4rem;
  align-items: center;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  position: relative;
  overflow: hidden;
  max-width: 900px;
  margin: 0 auto;
}

.author__card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(195, 100%, 50%, 0.04) 0%, hsl(258, 79%, 58%, 0.04) 100%);
  pointer-events: none;
}

.author__photo-wrap {
  position: relative;
  flex-shrink: 0;
}

.author__photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  position: relative;
  z-index: 1;
}

.author__photo-ring {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: var(--grad-primary);
  z-index: 0;
  padding: 3px;
  -webkit-mask: linear-gradient(white, white) content-box, linear-gradient(white, white);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.author__photo-glow {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: radial-gradient(circle, hsl(195, 100%, 50%, 0.15) 0%, transparent 70%);
  z-index: 0;
  animation: photoGlow 3s ease-in-out infinite alternate;
}

.author__info {
  position: relative;
  z-index: 1;
}

.author__name {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--clr-text);
  margin-bottom: 0.4rem;
}

.author__role {
  font-size: 1rem;
  font-weight: 500;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.25rem;
}

.author__bio {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  line-height: 1.75;
  max-width: 52ch;
  margin-bottom: 1.75rem;
}

.author__links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9375rem;
  border: 1px solid;
  transition: transform 0.25s var(--ease-spring), box-shadow 0.25s ease, background 0.25s ease;
}

.social-btn:hover { transform: translateY(-3px); }

.social-btn--linkedin {
  background: hsl(201, 100%, 35%, 0.15);
  border-color: hsl(201, 100%, 35%, 0.4);
  color: hsl(201, 100%, 65%);
}

.social-btn--linkedin:hover {
  background: hsl(201, 100%, 35%, 0.25);
  box-shadow: 0 8px 24px hsl(201, 100%, 35%, 0.2);
}

.social-btn--github {
  background: hsl(240, 10%, 100%, 0.06);
  border-color: var(--clr-border);
  color: var(--clr-text);
}

.social-btn--github:hover {
  background: hsl(240, 10%, 100%, 0.1);
  border-color: hsl(240, 10%, 100%, 0.25);
  box-shadow: 0 8px 24px hsl(240, 25%, 2%, 0.4);
}

/* ── 14. CTA SECTION ── */
.cta-section {
  background: var(--clr-bg-2);
}

.cta-card {
  position: relative;
  background: var(--clr-bg-card);
  border: 1px solid hsl(258, 79%, 58%, 0.3);
  border-radius: var(--radius-xl);
  padding: clamp(2.5rem, 5vw, 4rem);
  text-align: center;
  overflow: hidden;
}

.cta-card__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70%;
  height: 70%;
  background: radial-gradient(ellipse, hsl(258, 79%, 58%, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-card__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  position: relative;
}

.cta-card__desc {
  font-size: 1.0625rem;
  color: var(--clr-text-muted);
  margin-bottom: 2rem;
  max-width: 52ch;
  margin-inline: auto;
  position: relative;
}

.cta-card__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

/* ── 15. FOOTER ── */
.footer {
  background: hsl(240, 30%, 3%);
  border-top: 1px solid var(--clr-border);
  padding-block: 2.5rem;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer__logo { font-size: 1rem; }

.footer__tagline {
  font-size: 0.9625rem;
  color: var(--clr-text-faint);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__link {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  transition: color 0.2s;
}

.footer__link:hover { color: var(--clr-cyan); }

.footer__copy {
  font-size: 0.9625rem;
  color: var(--clr-text-faint);
  text-align: center;
}

/* ── 16. Scroll Reveal Animations ── */

/* Base state: hidden */
.reveal-up,
.reveal-left,
.reveal-right {
  opacity: 0;
  transition: opacity 0.7s ease, transform 0.7s var(--ease-out-expo);
  transition-delay: var(--delay, 0ms);
}

.reveal-up    { transform: translateY(40px); }
.reveal-left  { transform: translateX(-40px); }
.reveal-right { transform: translateX(40px); }

/* Visible state */
.reveal-up.visible,
.reveal-left.visible,
.reveal-right.visible {
  opacity: 1;
  transform: translate(0);
}

/* CSS Scroll-driven animation fallback support */
@supports ((animation-timeline: view()) and (animation-range: entry)) {
  .reveal-up,
  .reveal-left,
  .reveal-right {
    /* Override JS approach with pure CSS */
    animation: revealUp 0.7s var(--ease-out-expo) both;
    animation-timeline: view();
    animation-range: entry 10% entry 40%;
    opacity: unset;
    transform: unset;
  }

  .reveal-left { animation-name: revealLeft; }
  .reveal-right { animation-name: revealRight; }

  @keyframes revealUp {
    from { opacity: 0; transform: translateY(40px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  @keyframes revealLeft {
    from { opacity: 0; transform: translateX(-40px); }
    to   { opacity: 1; transform: translateX(0); }
  }

  @keyframes revealRight {
    from { opacity: 0; transform: translateX(40px); }
    to   { opacity: 1; transform: translateX(0); }
  }
}

/* ── 17. Keyframes ── */
@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.85); }
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 1; }
  50%       { transform: rotate(45deg) translate(4px, 4px); opacity: 0.4; }
}

@keyframes blink {
  50% { opacity: 0; }
}

@keyframes photoGlow {
  from { opacity: 0.5; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1.05); }
}

/* ── 18. Responsive ── */
@media (max-width: 1280px) {
  .features__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  .about__grid { grid-template-columns: 1fr; gap: 3rem; }
  .turn-flow { order: -1; max-width: 420px; margin: 0 auto; }
  .scoring__layout { flex-direction: column; }
  .arch__turn-grid,
  .arch__exec-grid,
  .arch__postrun-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }   /* hide GitHub CTA on mobile to save space */
  .lang-toggle { margin-left: auto; font-size: 0.85rem; padding: 0.3rem 0.75rem; }
  .features__grid { grid-template-columns: 1fr; }
  .author__card { flex-direction: column; gap: 2rem; padding: 2.5rem 1.75rem; }
  .author__photo { width: 160px; height: 160px; }
  .hero__stats { gap: 1.25rem; padding: 1.25rem 1.5rem; flex-wrap: wrap; justify-content: center; }
  .hero__stat-divider { display: none; }
  .arch__store-chips { justify-content: center; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .scoring__bars { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__title { font-size: clamp(2.5rem, 12vw, 4rem); }
  .author__card { padding: 2rem 1.25rem; }
  .arch__diagram { padding: 1.5rem; }
  .skills-grid { grid-template-columns: 1fr; }
}

/* ── 19. Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ── 20. Hero badge extras ── */
.hero__badge-mono {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.hero__badge-sep {
  opacity: 0.35;
  font-size: 0.85rem;
}

/* ── 21. Turn Flow Diagram ── */
.turn-flow {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  position: relative;
}

.turn-flow__step {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s var(--ease-spring);
  cursor: default;
}

.turn-flow__step:hover {
  border-color: hsl(195, 100%, 50%, 0.4);
  box-shadow: var(--shadow-glow-cyan);
  transform: translateX(4px);
}

.turn-flow__icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  width: 2.5rem;
  text-align: center;
}

.turn-flow__content {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.turn-flow__name {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--clr-cyan);
}

.turn-flow__desc {
  font-size: 0.925rem;
  color: var(--clr-text-faint);
}

.turn-flow__arrow {
  text-align: center;
  font-size: 1rem;
  color: var(--clr-border);
  padding: 0.3rem 0;
  line-height: 1;
}

/* ── 22. Scoring Section ── */
.scoring {
  background: var(--clr-bg);
  position: relative;
}

.scoring::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 40% at 50% 50%, hsl(195, 80%, 20%, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.scoring__layout {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
}

.scoring__formula {
  flex: 1;
}

.formula-box {
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.formula-box__label {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  font-weight: 600;
}

.formula-terms {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.formula-term {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.formula-term strong { font-weight: 700; }

.formula-term--pos {
  background: hsl(195, 100%, 50%, 0.07);
  border: 1px solid hsl(195, 100%, 50%, 0.2);
  color: var(--clr-cyan);
}

.formula-term--neg {
  background: hsl(322, 80%, 60%, 0.07);
  border: 1px solid hsl(322, 80%, 60%, 0.2);
  color: var(--clr-pink);
}

.scoring__bars {
  flex: 1.2;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.score-bar {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.score-bar__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.score-bar__name {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-text);
}

.score-bar__weight {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.score-bar__weight--pos { color: var(--clr-cyan); }
.score-bar__weight--neg { color: var(--clr-pink); }

.score-bar__track {
  height: 8px;
  border-radius: var(--radius-full);
  background: hsl(240, 20%, 100%, 0.06);
  overflow: hidden;
}

.score-bar__fill {
  height: 100%;
  width: var(--pct);
  border-radius: var(--radius-full);
  transition: width 1.2s var(--ease-out-expo);
}

.score-bar__fill--pos {
  background: linear-gradient(90deg, hsl(195, 100%, 40%) 0%, hsl(195, 100%, 60%) 100%);
  box-shadow: 0 0 8px hsl(195, 100%, 50%, 0.4);
}

.score-bar__fill--neg {
  background: linear-gradient(90deg, hsl(322, 80%, 40%) 0%, hsl(322, 80%, 60%) 100%);
  box-shadow: 0 0 8px hsl(322, 80%, 60%, 0.3);
}

.score-bar__desc {
  font-size: 0.925rem;
  color: var(--clr-text-faint);
}

/* ── 23. Updated Architecture Layout ── */
.arch__conn-line {
  height: 28px;
  width: 2px;
  background: linear-gradient(180deg, hsl(195, 100%, 50%, 0.4) 0%, hsl(258, 79%, 58%, 0.4) 100%);
  margin: 0 auto;
  position: relative;
}

.arch__conn-line::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid hsl(258, 79%, 58%, 0.5);
}

.arch__layer--entry,
.arch__layer--store {
  text-align: center;
}

.arch__node--entry {
  max-width: 400px;
  margin: 0 auto;
  background: linear-gradient(135deg, hsl(195, 100%, 50%, 0.06) 0%, hsl(258, 79%, 58%, 0.06) 100%);
  border-color: hsl(195, 100%, 50%, 0.3);
}

.arch__turn-grid,
.arch__exec-grid,
.arch__postrun-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.arch__node--turn {
  background: hsl(195, 100%, 50%, 0.04);
  border-color: hsl(195, 100%, 50%, 0.15);
}

.arch__node--exec {
  background: hsl(258, 79%, 58%, 0.04);
  border-color: hsl(258, 79%, 58%, 0.15);
}

.arch__node--postrun {
  background: hsl(172, 66%, 50%, 0.04);
  border-color: hsl(172, 66%, 50%, 0.15);
}

.arch__store-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-start;
}

/* ── 24. Tech Item Variants ── */
.tech-item--live,
.tech-item--planned {
  align-items: flex-start;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  flex-direction: row;
  gap: 0.75rem;
}

.tech-item--live {
  border-color: hsl(195, 100%, 50%, 0.2);
  background: hsl(195, 100%, 50%, 0.04);
}

.tech-item--planned {
  border-color: var(--clr-border);
  background: hsl(240, 20%, 100%, 0.02);
  opacity: 0.6;
}

.tech-item__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-cyan);
  box-shadow: 0 0 6px var(--clr-cyan);
  flex-shrink: 0;
  margin-top: 4px;
  animation: pulse 2.5s ease-in-out infinite;
}

.tech-item__dot--planned {
  background: var(--clr-text-faint);
  box-shadow: none;
  animation: none;
}

.tech-item__name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--clr-text);
  display: block;
}

.tech-item__sub {
  font-size: 0.85rem;
  color: var(--clr-text-faint);
  display: block;
  margin-top: 0.2rem;
  font-family: var(--font-mono);
}

.tech-stack__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
}

@media (max-width: 900px) {
  .tech-stack__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .tech-stack__grid { grid-template-columns: 1fr; }
}

/* ── 25. Skills Grid ── */
.toolsets {
  background: var(--clr-bg-2);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
}

.skill-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 1.25rem 1rem;
  border-radius: var(--radius-lg);
  background: var(--clr-bg-card);
  border: 1px solid var(--clr-border);
  text-align: center;
  cursor: default;
  transition: border-color 0.25s, transform 0.25s var(--ease-spring), box-shadow 0.25s;
}

.skill-chip:hover {
  border-color: hsl(195, 100%, 50%, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-cyan);
}

.skill-chip__icon { font-size: 1.5rem; }

.skill-chip__name {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  word-break: break-word;
  line-height: 1.3;
}

.skills-note {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
  background: hsl(240, 20%, 100%, 0.03);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
}

.skills-note code {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--clr-cyan);
  background: hsl(195, 100%, 50%, 0.08);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
}

/* code tags in feature cards */
.feature-card__desc code {
  font-family: var(--font-mono);
  font-size: 0.93rem;
  color: var(--clr-cyan);
  background: hsl(195, 100%, 50%, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  white-space: nowrap;
}