/* ============================================================
   SECURITY SYSTEMS ENGINEER — Landing Page
   styles.css  v2.1 (enhanced)
   ============================================================ */

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:           #0B0F14;
  --bg-card:      #0F1620;

  --accent:       #00F0FF;
  --accent-dim:   rgba(0, 240, 255, 0.12);
  --accent-glow:  rgba(0, 240, 255, 0.22);
  --accent-green: #00FFA3;
  --green-dim:    rgba(0, 255, 163, 0.12);
  --accent-amber: #FF9500;
  --amber-dim:    rgba(255, 149, 0, 0.15);
  --amber-glow:   rgba(255, 149, 0, 0.30);

  --border:       rgba(0, 240, 255, 0.10);
  --border-hover: rgba(0, 240, 255, 0.38);

  --text:         #C8D8E8;
  --text-mid:     #7A96B0;
  --text-dim:     #587294;  /* P1.5: raised from #3E5570 — passes WCAG AA */

  --font-sans:    'Space Grotesk', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Type scale — Major Third (1.250) */
  --fs-xs:   0.64rem;   /* 10.2px */
  --fs-sm:   0.80rem;   /* 12.8px */
  --fs-base: 1.00rem;   /* 16px   */
  --fs-md:   1.25rem;   /* 20px   */
  --fs-lg:   1.563rem;  /* 25px   */
  --fs-xl:   1.953rem;  /* 31.2px */
  --fs-2xl:  2.441rem;  /* 39px   */
  --fs-3xl:  3.052rem;  /* 48.8px */

  --bg-alt:  #070B0F;   /* alternating section background */

  /* Spacing scale — Perfect Fourth (1.333) */
  --sp-1: 0.25rem;   /*  4px */
  --sp-2: 0.5rem;    /*  8px */
  --sp-3: 0.75rem;   /* 12px */
  --sp-4: 1rem;      /* 16px */
  --sp-5: 1.5rem;    /* 24px */
  --sp-6: 2rem;      /* 32px */
  --sp-7: 3rem;      /* 48px */
  --sp-8: 4rem;      /* 64px */
  --sp-9: 6rem;      /* 96px */

  --radius:       4px;
  --tr:           0.25s ease;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
  overflow-x: hidden;
}

/* Scanline overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 3px,
    rgba(0,0,0,0.018) 3px,
    rgba(0,0,0,0.018) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
svg { display: block; }

/* ── Utility ────────────────────────────────────────────────── */
.mono          { font-family: var(--font-mono); }
.accent        { color: var(--accent); }
.accent-green  { color: var(--accent-green); }
.dim           { color: var(--text-dim); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.gradient-text {
  background: linear-gradient(90deg, var(--accent), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Reveal animations ──────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.revealed    { opacity: 1; transform: translateY(0); }
.reveal-delay-1     { transition-delay: 0.15s; }
.reveal-delay-2     { transition-delay: 0.30s; }
.reveal-delay-3     { transition-delay: 0.45s; }

/* ── Pulsing dot ────────────────────────────────────────────── */
.status-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
  animation: pulse-dot 2.4s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 6px var(--accent-green); }
  50%       { opacity: 0.35; box-shadow: none; }
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.72rem 1.6rem;
  font-family: var(--font-sans);
  font-size: 0.94rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--tr);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

/* Shimmer sweep */
.btn::after {
  content: '';
  position: absolute;
  top: 0; left: -80%;
  width: 60%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
  transform: skewX(-18deg);
  transition: left 0.55s ease;
  pointer-events: none;
}
.btn:hover::after { left: 140%; }

.btn-primary {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
  box-shadow:
    0 0 16px rgba(0,240,255,0.14),
    inset 0 0 14px rgba(0,240,255,0.06);
}
.btn-primary:hover {
  background: rgba(0,240,255,0.18);
  box-shadow:
    0 0 28px rgba(0,240,255,0.30),
    0 0 60px rgba(0,240,255,0.10),
    inset 0 0 20px rgba(0,240,255,0.10);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  color: var(--text-mid);
  border-color: var(--border);
  background: transparent;
}
.btn-secondary:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: rgba(0,240,255,0.04);
  box-shadow: 0 0 14px rgba(0,240,255,0.06);
}

.btn-large { padding: 0.95rem 2.4rem; font-size: 1.02rem; }
.btn-icon  { display: flex; align-items: center; }
.btn-arrow { font-size: 1.1rem; line-height: 1; }

/* Amber CTA variant (P2.3) */
.btn-cta {
  color: var(--accent-amber);
  border-color: var(--accent-amber);
  background: var(--amber-dim);
  box-shadow:
    0 0 18px rgba(255,149,0,0.12),
    inset 0 0 14px rgba(255,149,0,0.06);
}
.btn-cta:hover {
  background: rgba(255,149,0,0.20);
  box-shadow:
    0 0 28px rgba(255,149,0,0.28),
    0 0 60px rgba(255,149,0,0.10),
    inset 0 0 20px rgba(255,149,0,0.08);
  transform: translateY(-1px);
}
.btn-cta:active { transform: translateY(0); }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 2rem;
  background: rgba(11,15,20,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0,240,255,0.07);
  transition: border-color 0.4s, box-shadow 0.4s;
}
.navbar.scrolled {
  border-bottom-color: rgba(0,240,255,0.18);
  box-shadow: 0 1px 30px rgba(0,0,0,0.4);
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-mid);
  letter-spacing: 0.04em;
}
.nav-bracket { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.86rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
  transition: color var(--tr);
}
.nav-links a:hover { color: var(--text); }
.nav-links a.nav-active {
  color: var(--accent);
  position: relative;
}
.nav-links a.nav-active::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
}
.nav-links .nav-cta {
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius);
  background: var(--accent-dim);
  transition: background var(--tr), box-shadow var(--tr);
}
.nav-links .nav-cta:hover {
  background: rgba(0,240,255,0.16);
  box-shadow: 0 0 12px rgba(0,240,255,0.18);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* ── Hamburger toggle (hidden on desktop) ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0 8px;
  transition: border-color var(--tr);
}
.nav-toggle:hover { border-color: var(--border-hover); }

.nav-toggle-bar {
  display: block;
  width: 100%; height: 1.5px;
  background: var(--text-mid);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background var(--tr);
}
.nav-toggle:hover .nav-toggle-bar { background: var(--accent); }

/* Animated X when open */
body.nav-open .nav-toggle-bar:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
body.nav-open .nav-toggle-bar:nth-child(2) { opacity: 0; transform: scaleX(0); }
body.nav-open .nav-toggle-bar:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── Mobile overlay ── */
.nav-overlay {
  position: fixed;
  top: 57px; left: 0; right: 0;
  background: rgba(11,15,20,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4,0,0.2,1);
}
body.nav-open .nav-overlay {
  max-height: 320px;
}

.nav-overlay-links {
  list-style: none;
  padding: 1rem 0 1.5rem;
}
.nav-overlay-links li {
  border-bottom: 1px solid rgba(0,240,255,0.06);
}
.nav-overlay-links a {
  display: block;
  padding: 0.9rem 1.5rem;
  font-size: 1rem;
  color: var(--text-mid);
  letter-spacing: 0.02em;
  transition: color var(--tr), background var(--tr);
}
.nav-overlay-links a:hover,
.nav-overlay-links a:focus {
  color: var(--accent);
  background: rgba(0,240,255,0.04);
}

/* ============================================================
   SECTION COMMONS
   ============================================================ */
section { padding: 6rem 0; }

.section-header { margin-bottom: 3rem; }

.section-tag {
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  margin-bottom: 0.6rem;
  opacity: 0.75;
}
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  margin-bottom: 0.75rem;
}
.section-line {
  width: 52px; height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  margin-top: 0.75rem;
}

/* Alt header — right-aligned line + green accent (P3.5) */
.section-header--alt .section-tag { color: var(--accent-green); }
.section-header--alt .section-line {
  background: linear-gradient(90deg, var(--accent-green), transparent);
}

/* ============================================================
   HERO
   ============================================================ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 7rem;
  padding-bottom: 5rem;
  position: relative;
  overflow: hidden;
}

/* Canvas particles */
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* Two-level engineering grid */
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,240,255,0.048) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.048) 1px, transparent 1px),
    linear-gradient(rgba(0,240,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.018) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px, 20px 20px, 20px 20px;
  pointer-events: none;
  z-index: 0;
}

/* Radial vignette + bottom fade */
#hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 30% 50%, transparent 40%, rgba(11,15,20,0.55) 100%),
    linear-gradient(to bottom, transparent 70%, var(--bg) 100%);
  pointer-events: none;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

/* ── Hero left ── */
.system-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.38rem 0.85rem;
  border: 1px solid rgba(0,255,163,0.22);
  border-radius: var(--radius);
  background: rgba(0,255,163,0.05);
  margin-bottom: 1.5rem;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 6px var(--accent-green);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
.badge-text {
  font-size: 0.72rem;
  color: var(--accent-green);
  letter-spacing: 0.06em;
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 1.2rem;
}

.hero-subtitle {
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  opacity: 0.85;
  margin-bottom: 1.2rem;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-mid);
  line-height: 1.7;
  margin-bottom: 2rem;
}

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

/* ── Hero right / diagram ── */
.diagram-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  box-shadow:
    0 0 0 1px rgba(0,240,255,0.04),
    0 4px 40px rgba(0,0,0,0.5),
    0 0 40px rgba(0,240,255,0.07);
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.4s ease, border-color 0.4s ease;
}
.diagram-wrap:hover {
  border-color: rgba(0,240,255,0.22);
  box-shadow:
    0 0 0 1px rgba(0,240,255,0.08),
    0 4px 50px rgba(0,0,0,0.5),
    0 0 60px rgba(0,240,255,0.12);
}

/* Corner brackets */
.diagram-wrap::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px;
  width: 22px; height: 22px;
  border-top: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
  border-radius: 6px 0 0 0;
  z-index: 2;
}
.diagram-wrap::after {
  content: '';
  position: absolute;
  bottom: -1px; right: -1px;
  width: 22px; height: 22px;
  border-bottom: 2px solid var(--accent-green);
  border-right: 2px solid var(--accent-green);
  border-radius: 0 0 6px 0;
  z-index: 2;
}

/* Periodic scan line sweeping downward */
.diagram-scan {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(0,240,255,0.0) 10%,
    rgba(0,240,255,0.55) 50%,
    rgba(0,240,255,0.0) 90%,
    transparent 100%
  );
  box-shadow: 0 0 8px rgba(0,240,255,0.4), 0 0 20px rgba(0,240,255,0.15);
  animation: diagram-scan 5s linear infinite;
  pointer-events: none;
  z-index: 3;
}
@keyframes diagram-scan {
  0%   { top: 0;    opacity: 0; }
  4%   { opacity: 1; }
  85%  { opacity: 0.5; }
  100% { top: 100%; opacity: 0; }
}

.diagram-header {
  display: flex;
  align-items: center;
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  position: relative;
  z-index: 1;
}
.diagram-cursor {
  animation: blink 1s step-end infinite;
  margin-left: 1px;
  color: var(--accent);
}
@keyframes blink { 50% { opacity: 0; } }

/* Nodes row */
.diagram {
  display: flex;
  align-items: center;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 4px;
  position: relative;
  z-index: 1;
}
.diagram::-webkit-scrollbar { display: none; }

/* Individual node */
.d-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  position: relative;
}

/* Pulse ring on the AI accent node */
.d-node--accent::before {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 52px; height: 52px;
  border: 1px solid rgba(0,240,255,0.45);
  border-radius: var(--radius);
  animation: node-ring 2.2s ease-out infinite;
  pointer-events: none;
  z-index: 0;
}
@keyframes node-ring {
  0%   { transform: translateX(-50%) scale(1);    opacity: 0.7; }
  100% { transform: translateX(-50%) scale(1.7);  opacity: 0;   }
}

.d-icon {
  width: 52px; height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--accent);
  transition: all var(--tr);
  position: relative;
  z-index: 1;
}
.d-icon svg { width: 22px; height: 22px; }

.d-node:hover .d-icon {
  background: rgba(0,240,255,0.18);
  border-color: rgba(0,240,255,0.45);
  box-shadow: 0 0 18px rgba(0,240,255,0.22), 0 0 40px rgba(0,240,255,0.08);
  transform: translateY(-2px);
}

.d-node--accent .d-icon {
  border-color: rgba(0,240,255,0.38);
  background: rgba(0,240,255,0.15);
  box-shadow: 0 0 16px rgba(0,240,255,0.20), inset 0 0 10px rgba(0,240,255,0.06);
}
.d-node--green .d-icon {
  color: var(--accent-green);
  background: var(--green-dim);
  border-color: rgba(0,255,163,0.25);
}
.d-node--green:hover .d-icon {
  box-shadow: 0 0 18px rgba(0,255,163,0.22), 0 0 40px rgba(0,255,163,0.08);
}

.d-name {
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: color var(--tr);
}
.d-node:hover .d-name { color: var(--text-mid); }

/* Connector */
.d-conn {
  flex: 1;
  min-width: 20px;
  height: 2px;
  position: relative;
  display: flex;
  align-items: center;
}
.d-line {
  position: absolute;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(0,240,255,0.38),
    rgba(0,240,255,0.14),
    rgba(0,240,255,0.38)
  );
}

/* Moving signal dot */
.d-signal {
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent), 0 0 22px rgba(0,240,255,0.5);
  top: 50%;
  transform: translateY(-50%);
  animation: sig-flow 2.8s linear infinite;
}
@keyframes sig-flow {
  0%   { left: -7px;             opacity: 0; }
  7%   { opacity: 1; }
  93%  { opacity: 1; }
  100% { left: calc(100% + 2px); opacity: 0; }
}

/* Diagram footer stats */
.diagram-footer {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0,240,255,0.07);
  font-size: 0.68rem;
  color: var(--text-dim);
  position: relative;
  z-index: 1;
}
.df-item  { display: flex; align-items: center; gap: 0.2rem; }
.stat-val { color: var(--text-mid); }

/* ============================================================
   SERVICES
   ============================================================ */
#services {
  background-image:
    linear-gradient(rgba(0,240,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.03) 1px, transparent 1px),
    linear-gradient(rgba(0,240,255,0.012) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.012) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px, 20px 20px, 20px 20px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.service-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  overflow: hidden;
  transition: transform var(--tr), border-color var(--tr), box-shadow var(--tr);
}
.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,240,255,0.30);
  box-shadow:
    0 12px 36px rgba(0,0,0,0.35),
    0 0 28px rgba(0,240,255,0.10),
    0 0 60px rgba(0,240,255,0.04);
}

/* Glowing top edge */
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 5%, var(--accent) 50%, transparent 95%
  );
  opacity: 0;
  transition: opacity var(--tr);
}
.service-card:hover::before { opacity: 0.6; }

/* Scan sweep on hover */
.service-card::after {
  content: '';
  position: absolute;
  left: 0; width: 100%;
  height: 50%;
  background: linear-gradient(to bottom,
    rgba(0,240,255,0.05) 0%, transparent 100%
  );
  top: -50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}
.service-card:hover::after {
  opacity: 1;
  animation: card-sweep 2s linear infinite;
}
@keyframes card-sweep {
  from { top: -50%; }
  to   { top: 105%; }
}

/* Corner accent */
.card-corner {
  position: absolute;
  top: -1px; left: -1px;
  width: 14px; height: 14px;
  border-top: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
  opacity: 0;
  transition: opacity var(--tr);
}
.service-card:hover .card-corner { opacity: 1; }

.service-icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 1.1rem;
  transition: filter var(--tr);
}
.service-card:hover .service-icon {
  filter: drop-shadow(0 0 6px rgba(0,240,255,0.5));
}
.service-icon svg { width: 36px; height: 36px; }

.service-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.65rem;
}
.service-card p {
  font-size: 0.875rem;
  color: var(--text-mid);
  line-height: 1.6;
  margin-bottom: 1.1rem;
}
.card-tag {
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

/* ============================================================
   APPROACH / PIPELINE
   ============================================================ */
#approach {
  background: var(--bg-alt);
  position: relative;
}
#approach::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,240,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.022) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.pipeline { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.pipeline-inner {
  position: relative;
  min-width: 680px;
  padding: 2.5rem 1rem 2rem;
}

.pipeline-track {
  position: absolute;
  top: calc(2.5rem + 24px);
  left: calc(1rem + 24px);
  right: calc(1rem + 24px);
  height: 2px;
  background: rgba(0,240,255,0.08);
  z-index: 0;
  border-radius: 2px;
}

.pipeline-progress {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-green));
  box-shadow: 0 0 12px rgba(0,240,255,0.45), 0 0 24px rgba(0,240,255,0.15);
  transition: width 2.2s cubic-bezier(0.35, 0, 0.2, 1);
  border-radius: 2px;
}
.pipeline.animated .pipeline-progress { width: 100%; }

.pipeline-steps {
  display: flex;
  justify-content: space-between;
  position: relative;
  z-index: 1;
}

.pipeline-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.1rem;
  flex: 1;
}

.step-node {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 2px solid rgba(0,240,255,0.15);
  transition: border-color 0.5s ease, box-shadow 0.5s ease, background 0.5s ease;
  position: relative;
}

/* Activation burst ring */
.pipeline.animated .step-node::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(0,240,255,0.5);
  animation: step-ring 1.2s ease-out forwards;
  opacity: 0;
}
@keyframes step-ring {
  0%   { transform: scale(0.8); opacity: 0.8; }
  100% { transform: scale(1.8); opacity: 0;   }
}

.pipeline.animated .step-node {
  border-color: var(--accent);
  background: rgba(0,240,255,0.06);
  box-shadow: 0 0 16px rgba(0,240,255,0.25), inset 0 0 8px rgba(0,240,255,0.08);
}

.pipeline.animated .pipeline-step:nth-child(1) .step-node { transition-delay: 0.2s; }
.pipeline.animated .pipeline-step:nth-child(2) .step-node { transition-delay: 0.6s; }
.pipeline.animated .pipeline-step:nth-child(3) .step-node { transition-delay: 1.0s; }
.pipeline.animated .pipeline-step:nth-child(4) .step-node { transition-delay: 1.4s; }
.pipeline.animated .pipeline-step:nth-child(5) .step-node { transition-delay: 1.8s; }

.pipeline.animated .pipeline-step:nth-child(1) .step-node::after { animation-delay: 0.35s; }
.pipeline.animated .pipeline-step:nth-child(2) .step-node::after { animation-delay: 0.75s; }
.pipeline.animated .pipeline-step:nth-child(3) .step-node::after { animation-delay: 1.15s; }
.pipeline.animated .pipeline-step:nth-child(4) .step-node::after { animation-delay: 1.55s; }
.pipeline.animated .pipeline-step:nth-child(5) .step-node::after { animation-delay: 1.95s; }

.step-num {
  font-size: 0.72rem;
  color: var(--text-dim);
  transition: color 0.5s ease;
}
.pipeline.animated .step-num { color: var(--accent); }

.step-content { text-align: center; }
.step-content h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.3rem;
}
.step-content p {
  font-size: 0.76rem;
  color: var(--text-mid);
  line-height: 1.45;
}

/* ============================================================
   TECHNOLOGIES
   ============================================================ */
#tech {
  background-image:
    linear-gradient(rgba(0,240,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.025) 1px, transparent 1px),
    linear-gradient(rgba(0,240,255,0.010) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.010) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px, 20px 20px, 20px 20px;
}

/* Tech groups (P3.3) */
.tech-groups {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.tech-group-label {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  opacity: 0.8;
}
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.tech-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.95rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-mid);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 2px;
  cursor: default;
  user-select: none;
  transition:
    opacity 0.4s ease,
    transform 0.4s ease,
    border-color var(--tr),
    color var(--tr),
    background var(--tr),
    box-shadow var(--tr);
}
.tech-chip:hover {
  border-color: rgba(0,240,255,0.40);
  color: var(--accent);
  background: rgba(0,240,255,0.06);
  box-shadow: 0 0 16px rgba(0,240,255,0.12), inset 0 0 8px rgba(0,240,255,0.04);
  transform: translateY(-2px);
}

.chip-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 4px var(--accent);
  flex-shrink: 0;
}
.chip-dot.chip-green {
  background: var(--accent-green);
  box-shadow: 0 0 4px var(--accent-green);
}

/* ============================================================
   PROJECTS
   ============================================================ */
#projects { background: var(--bg-alt); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.project-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  overflow: hidden;
  transition: transform var(--tr), border-color var(--tr), box-shadow var(--tr);
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,240,255,0.30);
  box-shadow:
    0 14px 40px rgba(0,0,0,0.40),
    0 0 30px rgba(0,240,255,0.10),
    0 0 70px rgba(0,240,255,0.04);
}

/* Colored top stripe — distinguishes project cards (P2.6) */
.project-glow {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-green));
  opacity: 0.55;
  transition: opacity var(--tr);
}
.project-card:hover .project-glow { opacity: 1; }

/* Inner depth glow */
.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  box-shadow: inset 0 0 30px rgba(0,240,255,0.00);
  transition: box-shadow 0.4s ease;
  pointer-events: none;
}
.project-card:hover::before {
  box-shadow: inset 0 0 30px rgba(0,240,255,0.04);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.project-id {
  font-size: 0.68rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}
.project-badge {
  font-size: 0.62rem;
  padding: 0.18rem 0.5rem;
  border-radius: 2px;
  letter-spacing: 0.08em;
}
.project-badge.active {
  color: var(--accent-green);
  border: 1px solid rgba(0,255,163,0.25);
  background: rgba(0,255,163,0.06);
  box-shadow: 0 0 8px rgba(0,255,163,0.14);
}
.project-badge.done {
  color: var(--text-dim);
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.7rem;
  line-height: 1.3;
}
.project-card p {
  font-size: 0.858rem;
  color: var(--text-mid);
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--accent);
  padding: 0.18rem 0.5rem;
  border: 1px solid rgba(0,240,255,0.20);
  border-radius: 2px;
  background: rgba(0,240,255,0.04);
  letter-spacing: 0.05em;
  transition: all var(--tr);
}
.project-card:hover .tag {
  border-color: rgba(0,240,255,0.30);
  background: rgba(0,240,255,0.07);
}

/* ============================================================
   EDUCATION
   ============================================================ */
#education {
  background-image:
    linear-gradient(rgba(0,240,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
}

.edu-list {
  display: flex;
  flex-direction: column;
  border-left: 2px solid rgba(0,240,255,0.10);
  margin-left: 0.5rem;
}

.edu-item {
  display: grid;
  grid-template-columns: 130px 1fr auto;
  gap: 1.5rem 2rem;
  align-items: center;
  padding: 1.4rem 1.75rem;
  border-left: 2px solid transparent;
  margin-left: -2px;
  position: relative;
  transition: border-color var(--tr), background var(--tr);
}
.edu-item:hover {
  border-left-color: rgba(0,240,255,0.38);
  background: rgba(0,240,255,0.015);
}

/* Corner bracket on edu-item (P3.4) */
.edu-item::before {
  content: '';
  position: absolute;
  top: -1px; right: -1px;
  width: 10px; height: 10px;
  border-top: 1px solid var(--accent);
  border-right: 1px solid var(--accent);
  opacity: 0;
  transition: opacity var(--tr);
}
.edu-item:hover::before { opacity: 0.7; }

.edu-dot {
  position: absolute;
  left: -6px; top: 50%;
  transform: translateY(-50%);
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid rgba(0,240,255,0.22);
  transition: border-color var(--tr), box-shadow var(--tr);
}
.edu-item:hover .edu-dot {
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(0,240,255,0.45);
}

.edu-year {
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.edu-content h4 {
  font-size: 0.97rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.2rem;
}
.edu-content p { font-size: 0.85rem; color: var(--text-mid); }

.edu-badge {
  font-size: 0.68rem;
  color: var(--accent);
  padding: 0.28rem 0.6rem;
  border: 1px solid rgba(0,240,255,0.20);
  border-radius: 2px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: all var(--tr);
}
.edu-item:hover .edu-badge {
  border-color: rgba(0,240,255,0.38);
  box-shadow: 0 0 10px rgba(0,240,255,0.12);
}

/* ============================================================
   CTA
   ============================================================ */
.section-cta { position: relative; overflow: hidden; }

.section-cta::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 900px; height: 600px;
  background: radial-gradient(ellipse,
    rgba(255,149,0,0.06) 0%,
    rgba(0,240,255,0.03) 45%,
    transparent 70%
  );
  pointer-events: none;
  animation: cta-breathe 6s ease-in-out infinite;
}
@keyframes cta-breathe {
  0%, 100% { transform: translate(-50%,-50%) scale(1);   opacity: 1; }
  50%       { transform: translate(-50%,-50%) scale(1.12); opacity: 0.7; }
}

.cta-block {
  position: relative;
  text-align: center;
  max-width: 660px;
  margin: 0 auto;
  padding: 4rem 3.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 0 60px rgba(0,0,0,0.45), 0 0 40px rgba(0,240,255,0.05);
  overflow: hidden;
}
.cta-block::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px;
  width: 28px; height: 28px;
  border-top: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
  border-radius: 6px 0 0 0;
}
.cta-block::after {
  content: '';
  position: absolute;
  bottom: -1px; right: -1px;
  width: 28px; height: 28px;
  border-bottom: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  border-radius: 0 0 6px 0;
}

.cta-tag {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
  margin-bottom: 1.5rem;
  opacity: 0.65;
}
.cta-title {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 1rem;
}
.cta-desc {
  font-size: 1rem;
  color: var(--text-mid);
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* CTA stat row (P2.5) */
.cta-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 2.2rem;
  padding: 1.2rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cta-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
}
.cta-stat-val {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  line-height: 1;
  margin-bottom: 0.3rem;
}
.cta-stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.cta-stat-divider {
  width: 1px;
  height: 2.5rem;
  background: var(--border);
}
.cta-meta {
  margin-top: 1.4rem;
  font-size: 0.72rem;
  color: var(--text-dim);
  opacity: 0.55;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 1.4rem 0;
  border-top: 1px solid rgba(0,240,255,0.07);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
}
.footer-name { color: var(--text-dim); letter-spacing: 0.06em; }
.footer-copy  { color: var(--text-dim); opacity: 0.45; letter-spacing: 0.05em; }
.footer-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent-green);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .services-grid,
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

/* P2.7: collapse hero earlier (tablet 960px) */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero-right { order: -1; }
}

@media (max-width: 768px) {
  section { padding: 4rem 0; }

  .navbar { padding: 0.75rem 1rem; }

  /* P1.1: show hamburger, hide desktop nav links */
  .nav-links  { display: none; }
  .nav-toggle { display: flex; }
  /* hide status clock on very small screens to give room to toggle */
  .nav-status { display: none; }

  .container { padding: 0 1.25rem; }

  .services-grid,
  .projects-grid { grid-template-columns: 1fr; }

  /* P1.4: fix edu timeline collapse */
  .edu-list { margin-left: 1rem; }
  .edu-item {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: 0.15rem 1rem;
    padding: 1.2rem 1rem 1.2rem 0.75rem;
    align-items: start;
  }
  .edu-year  { grid-column: 1; grid-row: 1; }
  .edu-content { grid-column: 1 / -1; grid-row: 2; }
  .edu-badge { grid-column: 2; grid-row: 1; align-self: start; }
  .edu-dot   { top: 1.4rem; }

  .cta-block { padding: 2.5rem 1.5rem; }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn { justify-content: center; }

  .d-icon     { width: 44px; height: 44px; }
  .d-icon svg { width: 18px; height: 18px; }
}

/* ============================================================
   P1.2 — prefers-reduced-motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  /* Kill decorative/looping animations; keep meaningful transitions */
  .diagram-scan,
  .d-signal,
  .d-node--accent::before,
  .status-dot,
  .badge-dot,
  .section-cta::before,
  @keyframes node-ring,
  @keyframes sig-flow,
  @keyframes diagram-scan,
  @keyframes cta-breathe { animation: none !important; }

  /* Shorten transitions so the UI is still responsive, just instant */
  .reveal,
  .service-card,
  .project-card,
  .tech-chip,
  .btn { transition-duration: 0.01ms !important; }
}

/* ============================================================
   P3.2 — focus-visible for keyboard nav
   ============================================================ */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0,240,255,0.45) !important;
}
.nav-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── About ──────────────────────────────────────────────────── */
#about {
  padding: var(--sp-8) 0;
  background: var(--bg-alt);
}

.about-block {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--sp-8);
  align-items: start;
  max-width: 800px;
}

.about-text .section-tag {
  margin-bottom: var(--sp-5);
}

.about-text p {
  color: var(--text-mid);
  margin-bottom: var(--sp-4);
  font-size: var(--fs-md);
  line-height: 1.7;
}

.about-text p:last-child { margin-bottom: 0; }

.about-meta {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding-top: var(--sp-7);
}

.meta-item {
  color: var(--text-dim);
  font-size: var(--fs-sm);
  white-space: nowrap;
}

.meta-item .accent { color: var(--accent); margin-right: var(--sp-2); }

@media (max-width: 640px) {
  .about-block {
    grid-template-columns: 1fr;
  }
  .about-meta {
    padding-top: 0;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--sp-4);
  }
}

/* ── Timeline ───────────────────────────────────────────────── */
#timeline {
  padding: var(--sp-9) 0;
}

.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  max-width: 700px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 110px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--border);
}

.tl-item {
  display: grid;
  grid-template-columns: 100px 24px 1fr auto;
  align-items: start;
  gap: var(--sp-4);
  padding: var(--sp-5) 0;
  position: relative;
}

.tl-year {
  font-size: var(--fs-sm);
  color: var(--text-dim);
  text-align: right;
  padding-top: 2px;
}

.tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid var(--text-dim);
  margin-top: 4px;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}

.tl-dot--active {
  background: var(--accent-green);
  border-color: var(--accent-green);
  box-shadow: 0 0 8px var(--green-dim);
}

.tl-dot--accent {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-dim);
}

.tl-content h4 {
  font-size: var(--fs-base);
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--sp-1);
}

.tl-content p {
  font-size: var(--fs-sm);
  color: var(--text-mid);
}

.tl-badge {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 2px var(--sp-2);
  border-radius: var(--radius);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .timeline::before { left: 80px; }
  .tl-item { grid-template-columns: 70px 20px 1fr auto; }
  .tl-year { font-size: var(--fs-xs); }
}