/* ─────────────────────────────────────────────────────────────────
   AI-Augmented Engineering Portfolio
   Philosophy: Dark Precision (Linear / Vercel / Resend aesthetic)
   ───────────────────────────────────────────────────────────────── */

/* ─── Custom Cursor ──────────────────────────────────────────────── */
/* Hidden by default — JS adds .cursor-ready to body when mouse first moves */
.cursor { display: none; }

body.cursor-ready .cursor {
  display: block;
  position: fixed;
  top: 0; left: 0;
  pointer-events: none;
  z-index: 9500;
}

body.cursor-ready { cursor: none; }
body.cursor-ready a,
body.cursor-ready button,
body.cursor-ready .project-card { cursor: none; }

.cursor-dot {
  position: absolute;
  width: 6px;
  height: 6px;
  background: var(--color-accent-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: transform var(--duration-fast) var(--easing-out),
              background var(--duration-fast) var(--easing-default);
  will-change: transform;
}

.cursor-ring {
  position: absolute;
  width: 36px;
  height: 36px;
  border: 1.5px solid rgba(59, 130, 246, 0.4);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width var(--duration-normal) var(--easing-out),
              height var(--duration-normal) var(--easing-out),
              border-color var(--duration-normal) var(--easing-default),
              background var(--duration-normal) var(--easing-default);
  will-change: transform;
}

/* Hover state — ring expands and glows */
body.cursor-hover .cursor-ring {
  width: 56px;
  height: 56px;
  border-color: rgba(59, 130, 246, 0.7);
  background: rgba(59, 130, 246, 0.06);
}

body.cursor-hover .cursor-dot {
  transform: translate(-50%, -50%) scale(1.5);
  background: var(--color-accent-primary-hover);
}

/* Click state */
body.cursor-clicking .cursor-ring {
  width: 28px;
  height: 28px;
  border-color: var(--color-accent-primary);
  background: rgba(59, 130, 246, 0.12);
}

/* Hide cursor on touch devices */
@media (hover: none) {
  body.cursor-ready { cursor: auto; }
  .cursor { display: none !important; }
}

/* ─── Scramble effect chars ──────────────────────────────────────── */
.scramble-char {
  color: var(--color-accent-primary);
  opacity: 0.7;
}

/* ─── Film Grain Overlay ─────────────────────────────────────────── */
/* Fixed pseudo-element — sits above everything, pointer-events: none */
body::after {
  content: '';
  position: fixed;
  inset: -50%;          /* oversized so the shifting animation never shows an edge */
  width: 200%;
  height: 200%;
  pointer-events: none;
  z-index: 9000;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23g)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 300px 300px;
  animation: grainShift 0.4s steps(1) infinite;
}

@keyframes grainShift {
  0%   { transform: translate(0, 0); }
  20%  { transform: translate(-4%, 3%); }
  40%  { transform: translate(3%, -2%); }
  60%  { transform: translate(-2%, 5%); }
  80%  { transform: translate(4%, -3%); }
  100% { transform: translate(0, 0); }
}

/* ─── Scroll Progress Bar ────────────────────────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;           /* driven by JS: element.style.width = pct + '%' */
  height: 2px;
  background: linear-gradient(
    to right,
    var(--color-accent-secondary),
    var(--color-accent-primary),
    var(--color-accent-primary-hover)
  );
  z-index: 999;
  transform-origin: left;
  transition: width 0.05s linear;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.6);
}

/* ─── Hero: Floating Terminal Snippets ───────────────────────────── */
.hero-floats {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-float {
  position: absolute;
  left: var(--f-x);
  top:  var(--f-y);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-accent-primary);
  opacity: 0;                  /* GSAP fades these in */
  white-space: nowrap;
  animation: floatDrift 8s var(--f-delay, 0s) ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes floatDrift {
  from { transform: translateY(0px) translateX(0px); }
  to   { transform: translateY(-12px) translateX(6px); }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* ─── Typography Base ────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-family-display);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
}

p { line-height: var(--line-height-relaxed); }

/* ─── Layout Shell ───────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width-page);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-7); }
}

@media (min-width: 1024px) {
  .container { padding-inline: var(--space-8); }
}

/* ─── Section Base ───────────────────────────────────────────────── */
.section {
  padding-block: var(--space-9);
}

.section-alt {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-primary);
  border-bottom: 1px solid var(--color-border-primary);
}

.section-label {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: var(--color-accent-primary);
  margin-bottom: var(--space-7);
}

/* ─── Scroll reveal: initial state (GSAP animates these in) ──────── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  /* GSAP sets these to opacity:1, translateY:0 on scroll */
}

/* Fallback for no-JS: show content immediately */
.no-js .reveal {
  opacity: 1;
  transform: none;
}

/* ─────────────────────────────────────────────────────────────────
   NAV
   ───────────────────────────────────────────────────────────────── */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
}

.nav {
  height: 100%;
  max-width: var(--max-width-page);
  margin-inline: auto;
  padding-inline: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  background: transparent;
  transition: background var(--duration-normal) var(--easing-default),
              border-color var(--duration-normal) var(--easing-default),
              backdrop-filter var(--duration-normal) var(--easing-default);
  border-bottom: 1px solid transparent;
}

/* Scrolled state — applied by JS once user scrolls past hero */
.nav.scrolled {
  background: var(--color-nav-bg);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  backdrop-filter: blur(12px) saturate(180%);
  border-bottom-color: var(--color-border-primary);
}

@media (min-width: 768px) {
  .nav { padding-inline: var(--space-7); }
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav-logo-name {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  letter-spacing: 0;
  transition: color var(--duration-fast) var(--easing-default);
}

.nav-logo:hover .nav-logo-name,
.nav-logo:focus-visible .nav-logo-name {
  color: var(--color-accent-primary-hover);
}

/* Desktop nav links */
.nav-links {
  display: none;
  gap: var(--space-6);
  align-items: center;
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  position: relative;
  padding-block: var(--space-1);
  transition: color var(--duration-fast) var(--easing-default);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-accent-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-normal) var(--easing-out);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text-primary);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-link.active {
  color: var(--color-text-primary);
}

/* Focus styles */
.nav-link:focus-visible,
.nav-logo:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 4px;
  border-radius: var(--border-radius-md);
}

/* Hamburger */
.nav-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--border-radius-md);
  transition: background var(--duration-fast) var(--easing-default);
}

.nav-hamburger:hover { background: var(--color-bg-tertiary); }

.nav-hamburger:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.hamburger-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--duration-normal) var(--easing-default),
              opacity var(--duration-normal) var(--easing-default);
}

@media (min-width: 768px) { .nav-hamburger { display: none; } }

/* ─────────────────────────────────────────────────────────────────
   MOBILE NAV OVERLAY
   ───────────────────────────────────────────────────────────────── */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-5);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--duration-normal) var(--easing-default),
              visibility var(--duration-normal) var(--easing-default),
              transform var(--duration-normal) var(--easing-default);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-nav-close {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  padding: var(--space-2);
  color: var(--color-text-secondary);
  border-radius: var(--border-radius-md);
  transition: color var(--duration-fast) var(--easing-default),
              background var(--duration-fast) var(--easing-default);
}

.mobile-nav-close:hover { color: var(--color-text-primary); background: var(--color-bg-tertiary); }
.mobile-nav-close:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: 2px; }

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}

.mobile-nav-link {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  letter-spacing: var(--letter-spacing-tight);
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: color var(--duration-fast) var(--easing-default);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus-visible {
  color: var(--color-text-primary);
}

.mobile-nav-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 4px;
  border-radius: var(--border-radius-md);
}

.mobile-nav-backdrop {
  display: none; /* Mobile nav is full-screen, no backdrop needed */
}

/* ─────────────────────────────────────────────────────────────────
   HERO
   ───────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: clip;              /* clip prevents scrollbar from scale transform */
  padding-top: var(--nav-height);
  padding-inline: var(--space-5);
  transform-origin: top center; /* GSAP scale zooms from the top */
  will-change: transform;
}

/* Ambient blue glow — the only "decoration" in the entire site */
.hero-glow {
  position: absolute;
  top: -5%;
  left: 50%;
  transform: translateX(-50%);
  width: min(900px, 120vw);
  height: 500px;
  background: radial-gradient(ellipse at center top,
    rgba(59, 130, 246, 0.10) 0%,
    rgba(59, 130, 246, 0.04) 40%,
    transparent 70%
  );
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  /* No CSS animation here — GSAP owns all transforms on this element */
  will-change: transform;
}

.hero-glow {
  will-change: transform;
}

/* ASCII portrait — centered behind hero headline as background texture */
.hero-ascii {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 0;
  font-family: var(--font-family-mono);
  font-size: clamp(6.6px, 0.72vw, 11px);
  line-height: 1;
  white-space: pre;
  color: var(--color-accent-primary);
  opacity: 0.12;
  pointer-events: none;
  user-select: none;
  margin: 0;
  /* Fade in with the rest of the hero — GSAP will animate this */
  will-change: opacity, transform;
}

/* Hide on screens where it would overlap the headline */
@media (max-width: 900px) {
  .hero-ascii { display: none; }
}

/* heroFadeIn removed — GSAP controls all hero element motion */

.hero-label {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.hero-headline {
  font-family: var(--font-family-display);
  font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-6xl));
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-tight);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
}

.hero-tagline {
  font-family: var(--font-family-body);
  font-size: clamp(var(--font-size-base), 2vw, var(--font-size-lg));
  font-weight: var(--font-weight-normal);
  color: var(--color-text-secondary);
  line-height: var(--line-height-snug);
}

.hero-tagline-break { display: none; }

@media (min-width: 640px) {
  .hero-tagline-break { display: inline; }
}

/* Scroll indicator */
.hero-scroll {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-9);
  color: var(--color-text-tertiary);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  transition: color var(--duration-fast) var(--easing-default);
}

.hero-scroll:hover { color: var(--color-text-secondary); }

.hero-scroll-icon {
  animation: scrollBounce 2s var(--easing-bounce) infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(5px); }
}

/* ─────────────────────────────────────────────────────────────────
   ABOUT
   ───────────────────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr 1px 1fr;
    gap: var(--space-8);
    align-items: start;
  }
}

.about-divider {
  display: none;
  background: var(--color-border-secondary);
  align-self: stretch;
}

@media (min-width: 768px) {
  .about-divider { display: block; }
}

/* Each about column gets its own directional reveal via GSAP */
.about-col:first-child  { transform: translateX(-48px); }
.about-col:last-child   { transform: translateX(48px);  }
/* opacity is set by .reveal class; GSAP handles the reset */

/* Animated counter */
.counter {
  font-family: var(--font-family-mono);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-primary);
  font-variant-numeric: tabular-nums;
}

.about-col-title {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
}

.about-copy {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

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

/* ─────────────────────────────────────────────────────────────────
   HOW I WORK
   ───────────────────────────────────────────────────────────────── */
.workflow-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
}

@media (min-width: 768px) {
  .workflow-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }
}

.workflow-step {
  position: relative;
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border-primary);
}

.workflow-num {
  display: block;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-accent-primary);
  margin-bottom: var(--space-4);
}

.workflow-title {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.workflow-copy {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ─────────────────────────────────────────────────────────────────
   PROJECTS
   ───────────────────────────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

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

/* Unique accent bar per card — top gradient line */
.project-card::before {
  content: '';
  display: block;
  height: 2px;
  width: 100%;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--easing-default);
}
.project-card:hover::before { opacity: 1; }

.projects-grid .project-card:nth-child(1)::before {
  background: linear-gradient(90deg, #3b82f6, #22d3ee);  /* blue → cyan — Claude/AI */
}
.projects-grid .project-card:nth-child(2)::before {
  background: linear-gradient(90deg, #6366f1, #a78bfa);  /* indigo → violet — graphs/data */
}
.projects-grid .project-card:nth-child(3)::before {
  background: linear-gradient(90deg, #3b82f6, #14b8a6);  /* blue → teal — forms/clean */
}

.project-card {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-primary);
  background: var(--color-bg-secondary);
  /* 3D tilt: driven by JS mousemove via CSS custom properties */
  transform-style: preserve-3d;
  transform: perspective(800px)
             rotateX(var(--tilt-x, 0deg))
             rotateY(var(--tilt-y, 0deg))
             translateZ(0);
  transition: border-color var(--duration-normal) var(--easing-default),
              box-shadow var(--duration-normal) var(--easing-default),
              transform 0.15s var(--easing-out);
  will-change: transform;
}

.project-card:hover {
  border-color: rgba(59, 130, 246, 0.35);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.08),
              0 16px 48px rgba(59, 130, 246, 0.12),
              0 4px 12px rgba(0, 0, 0, 0.5);
}

/* When mouse leaves, smoothly reset tilt */
.project-card.tilt-reset {
  transition: border-color var(--duration-normal) var(--easing-default),
              box-shadow var(--duration-normal) var(--easing-default),
              transform 0.5s var(--easing-out);
}

.project-card-inner {
  padding: var(--space-6);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.project-name {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.project-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-5);
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.tag {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-full);
  padding: 3px var(--space-3);
  letter-spacing: 0.02em;
  transition: color var(--duration-fast) var(--easing-default),
              border-color var(--duration-fast) var(--easing-default),
              background var(--duration-fast) var(--easing-default);
}

.project-card:hover .tag {
  color: var(--color-accent-primary-hover);
  border-color: rgba(59, 130, 246, 0.2);
  background: rgba(59, 130, 246, 0.06);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent-primary);
  align-self: flex-start;
  transition: color var(--duration-fast) var(--easing-default),
              gap var(--duration-fast) var(--easing-default);
}

.project-link:hover,
.project-link:focus-visible {
  color: var(--color-accent-primary-hover);
  gap: var(--space-3);
}

.project-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 4px;
  border-radius: var(--border-radius-md);
}

/* ─────────────────────────────────────────────────────────────────
   WRITING
   ───────────────────────────────────────────────────────────────── */
.writing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

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

.writing-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-lg);
  transition: border-color var(--duration-normal) var(--easing-default),
              background var(--duration-normal) var(--easing-default),
              transform var(--duration-normal) var(--easing-default);
}

.writing-card:hover,
.writing-card:focus-visible {
  border-color: var(--color-border-secondary);
  background: var(--color-bg-tertiary);
  transform: translateY(-1px);
}

.writing-card:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.writing-date {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.writing-loading,
.writing-error {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding: var(--space-6) 0;
  grid-column: 1 / -1;
}

.writing-error a {
  color: var(--color-accent-primary);
  text-decoration: none;
}

.writing-title {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
}

.writing-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  flex: 1;
}

.writing-cta {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent-primary);
  letter-spacing: 0.01em;
  transition: color var(--duration-fast) var(--easing-default);
  margin-top: auto;
}

.writing-card:hover .writing-cta {
  color: var(--color-accent-primary-hover);
}

.writing-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
  padding-top: var(--space-2);
}

.writing-all-link {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--easing-default);
}

.writing-all-link:hover,
.writing-all-link:focus-visible {
  color: var(--color-text-primary);
}

.writing-all-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 4px;
  border-radius: var(--border-radius-md);
}

/* ─────────────────────────────────────────────────────────────────
   TESTIMONIALS
   ───────────────────────────────────────────────────────────────── */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
}

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

.testimonial-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  transition: border-color var(--duration-normal) var(--easing-default);
}

.testimonial-card:hover {
  border-color: var(--color-border-secondary);
}

.testimonial-quote-mark {
  font-family: var(--font-family-mono);
  font-size: 3rem;
  line-height: 1;
  color: var(--color-accent-primary);
  opacity: 0.5;
  user-select: none;
}

.testimonial-body {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  flex: 1;
}

.testimonial-divider {
  width: 32px;
  height: 1px;
  background: var(--color-border-secondary);
}

.testimonial-person {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--color-bg-secondary);
  flex-shrink: 0;
}

.testimonial-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.testimonial-name {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.testimonial-role {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.testimonial-link {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--easing-default);
  white-space: nowrap;
}

.testimonial-link:hover,
.testimonial-link:focus-visible {
  color: var(--color-accent-primary-hover);
}

.testimonial-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.testimonial-full-text {
  display: none;
}

.testimonial-card.expanded .testimonial-clip-text {
  display: none;
}

.testimonial-card.expanded .testimonial-full-text {
  display: block;
}

.testimonial-toggle {
  align-self: flex-start;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  color: var(--color-accent-primary);
  cursor: pointer;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  letter-spacing: 0.02em;
  padding: var(--space-1) var(--space-3);
  transition: border-color var(--duration-fast) var(--easing-default),
              color var(--duration-fast) var(--easing-default);
}

.testimonial-toggle:hover,
.testimonial-toggle:focus-visible {
  border-color: var(--color-accent-primary);
  color: var(--color-accent-primary-hover);
}

.testimonial-toggle:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.testimonials-loading,
.testimonials-error {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  padding: var(--space-6) 0;
  grid-column: 1 / -1;
}

.testimonials-error a {
  color: var(--color-accent-primary);
  text-decoration: none;
}

/* ─────────────────────────────────────────────────────────────────
   CONTACT
   ───────────────────────────────────────────────────────────────── */
.contact-inner {
  max-width: 560px;
}

.contact-line {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-8);
  line-height: var(--line-height-tight);
}

@media (min-width: 768px) {
  .contact-line { font-size: var(--font-size-3xl); }
}

.contact-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (min-width: 480px) {
  .contact-links { grid-template-columns: repeat(4, auto); justify-content: start; }
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-lg);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  min-height: 44px;
  white-space: nowrap;
  transition: color var(--duration-fast) var(--easing-default),
              border-color var(--duration-fast) var(--easing-default),
              background var(--duration-fast) var(--easing-default),
              transform var(--duration-fast) var(--easing-default);
}

.contact-link:hover,
.contact-link:focus-visible {
  color: var(--color-text-primary);
  border-color: var(--color-border-secondary);
  background: var(--color-bg-tertiary);
  transform: translateY(-1px);
}

.contact-link:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.contact-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-text-tertiary);
  transition: color var(--duration-fast) var(--easing-default);
}

.contact-link:hover .contact-icon,
.contact-link:focus-visible .contact-icon {
  color: var(--color-accent-primary);
}

/* ─────────────────────────────────────────────────────────────────
   FOOTER
   ───────────────────────────────────────────────────────────────── */
.footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border-primary);
}

.footer-text {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

/* ─────────────────────────────────────────────────────────────────
   SKELETON LOADING STATES
   ───────────────────────────────────────────────────────────────── */
@keyframes skeleton-shimmer {
  0%   { background-position: -800px 0; }
  100% { background-position:  800px 0; }
}

.skeleton-line {
  border-radius: var(--border-radius-sm);
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 25%,
    #252525 50%,
    var(--color-bg-tertiary) 75%
  );
  background-size: 800px 100%;
  animation: skeleton-shimmer 1.6s infinite linear;
}

/* Writing skeleton — mirrors .writing-card layout */
.skeleton-writing {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--border-radius-lg);
}

.skeleton-writing .skeleton-date  { height: 12px; width: 90px; }
.skeleton-writing .skeleton-title { height: 16px; width: 85%; margin-top: var(--space-1); }
.skeleton-writing .skeleton-body  { display: flex; flex-direction: column; gap: var(--space-2); margin-top: var(--space-1); }
.skeleton-writing .skeleton-body .skeleton-line { height: 13px; }
.skeleton-writing .skeleton-body .skeleton-line:nth-child(2) { width: 90%; }
.skeleton-writing .skeleton-body .skeleton-line:last-child    { width: 60%; }
.skeleton-writing .skeleton-cta   { height: 12px; width: 120px; margin-top: auto; padding-top: var(--space-2); }

/* Testimonial skeleton — mirrors .testimonial-card layout */
.skeleton-testimonial {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
}

.skeleton-testimonial .skeleton-quote { height: 32px; width: 24px; }
.skeleton-testimonial .skeleton-body  { display: flex; flex-direction: column; gap: var(--space-2); }
.skeleton-testimonial .skeleton-body .skeleton-line { height: 13px; }
.skeleton-testimonial .skeleton-body .skeleton-line:nth-child(2) { width: 95%; }
.skeleton-testimonial .skeleton-body .skeleton-line:nth-child(3) { width: 80%; }
.skeleton-testimonial .skeleton-body .skeleton-line:last-child    { width: 55%; }
.skeleton-testimonial .skeleton-divider { height: 1px; width: 32px; background: var(--color-border-secondary); }
.skeleton-testimonial .skeleton-person  { display: flex; align-items: center; gap: var(--space-3); }
.skeleton-testimonial .skeleton-avatar  { width: 40px; height: 40px; border-radius: 50%; flex-shrink: 0; }
.skeleton-testimonial .skeleton-meta    { display: flex; flex-direction: column; gap: var(--space-2); flex: 1; }
.skeleton-testimonial .skeleton-name    { height: 13px; width: 120px; }
.skeleton-testimonial .skeleton-role    { height: 11px; width: 90px; }

/* ─────────────────────────────────────────────────────────────────
   FOCUS VISIBILITY (global)
   ───────────────────────────────────────────────────────────────── */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 3px;
  border-radius: var(--border-radius-md);
}

/* ─────────────────────────────────────────────────────────────────
   REDUCED MOTION
   ───────────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  /* GSAP checks this flag and skips all animations when set.
     These rules are a belt-and-suspenders fallback for anything
     GSAP might miss (e.g. CSS-only floatDrift animation). */
  .hero-float {
    animation: none;
    opacity: 0.12;
  }

  .hero-scroll-icon { animation: none; }

  /* Disable 3D tilt */
  .project-card {
    transform: none !important;
    transition: border-color var(--duration-normal) var(--easing-default),
                box-shadow var(--duration-normal) var(--easing-default);
  }

  .project-card:hover,
  .writing-card:hover,
  .contact-link:hover {
    transform: none;
  }

  .skeleton-line { animation: none; }
}

/* ─────────────────────────────────────────────────────────────────
   ARTICLE / SUB-PAGE LAYOUT
   Used by pkm-llm-wiki.html, writing.html, and future essay pages.
   ───────────────────────────────────────────────────────────────── */

/* Breadcrumb back-link */
.article-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-decoration: none;
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-5);
  transition: color var(--duration-fast) var(--easing-default);
}
.article-breadcrumb:hover { color: var(--color-text-primary); }
.article-breadcrumb::before { content: '←'; margin-right: var(--space-1); }

/* Article page header */
.article-header {
  padding-top: calc(var(--nav-height) + var(--space-9));
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--color-border-primary);
  margin-bottom: var(--space-7);
}
.article-header .container {
  max-width: var(--max-width-content);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.article-date {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.article-title {
  font-family: var(--font-family-display);
  font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-4);
}

.article-deck {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-snug);
  margin: 0;
}

/* Article prose body */
.article-body {
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding-bottom: var(--space-9);
}

.article-body p {
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
}

.article-body p:last-of-type { margin-bottom: 0; }

/* Pull-quote block */
.article-pullquote {
  border-left: 3px solid var(--color-accent-primary);
  padding: var(--space-4) var(--space-6);
  margin: var(--space-7) 0;
  background: var(--color-bg-secondary);
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

.article-pullquote p {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
  margin: 0;
  font-style: italic;
}

/* CTA button */
.article-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  text-align: center;
  margin: var(--space-8) 0;
}

.article-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  background: var(--color-accent-primary);
  color: #ffffff;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: background var(--duration-fast) var(--easing-default),
              transform var(--duration-fast) var(--easing-default),
              box-shadow var(--duration-fast) var(--easing-default);
}

.article-cta-btn:hover {
  background: var(--color-accent-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.article-cta-note {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  letter-spacing: var(--letter-spacing-wide);
}

/* Author byline */
.article-byline {
  border-top: 1px solid var(--color-border-primary);
  padding-top: var(--space-6);
  margin-top: var(--space-7);
}

.article-byline p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
}

.article-byline a {
  color: var(--color-accent-primary);
  text-decoration: none;
}

.article-byline a:hover { color: var(--color-accent-primary-hover); }

/* Related writing footer nav */
.article-related {
  border-top: 1px solid var(--color-border-primary);
  padding-top: var(--space-5);
  margin-top: var(--space-5);
}

.article-related-label {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.article-related-link {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--easing-default);
}

.article-related-link:hover { color: var(--color-accent-primary-hover); }

/* ── Writing index page ──────────────────────────────────────── */
.writing-page-header {
  padding-top: calc(var(--nav-height) + var(--space-9));
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--color-border-primary);
  margin-bottom: var(--space-7);
}

.writing-page-tagline {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin: var(--space-3) 0 var(--space-5);
}

.writing-page-subscribe {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-accent-primary);
  text-decoration: none;
  letter-spacing: var(--letter-spacing-wide);
  transition: color var(--duration-fast) var(--easing-default);
}

.writing-page-subscribe:hover { color: var(--color-accent-primary-hover); }

.writing-section-heading {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-primary);
}

.writing-page-section {
  margin-bottom: var(--space-9);
}

.writing-page-footer {
  border-top: 1px solid var(--color-border-primary);
  padding: var(--space-7) 0 var(--space-9);
  text-align: center;
}

/* Mobile responsive for article pages */
@media (max-width: 768px) {
  .article-header {
    padding-top: calc(var(--nav-height) + var(--space-7));
  }
  .article-body {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
  .article-pullquote {
    padding: var(--space-3) var(--space-4);
    margin: var(--space-6) 0;
  }
}