/* =====================================================================
   Deniz Can Dursun · Portfolio V7
   Design language: HMI / Industrial Console (dark)
   Identity: control panel + datasheet + technical drawing fingerprint
   Color: deep charcoal + safety amber + process cyan + status green
   ===================================================================== */

:root {
  /* HMI surfaces */
  --bg: #0E1116;
  --bg-2: #131820;
  --surface: #161A20;
  --surface-2: #1B2230;
  --surface-3: #20283A;
  --rule: #2A3140;
  --rule-strong: #3A4456;
  --grid: #1B2230;

  /* Text */
  --text: #E8E6E0;
  --text-2: #B5B0A6;
  --muted: #8A8F98;
  --dim: #5A5F68;

  /* Accents (HMI semantic) */
  --amber: #E8A33D;
  --amber-soft: rgba(232, 163, 61, 0.12);
  --amber-hover: #F4B454;
  --green: #5DD39E;
  --green-soft: rgba(93, 211, 158, 0.12);
  --cyan: #5BC0DE;
  --cyan-soft: rgba(91, 192, 222, 0.10);
  --red: #E24B4A;

  /* Type */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SF Mono", Menlo, monospace;
  --font-display: "Inter", system-ui, sans-serif;

  /* Layout */
  --container: min(1280px, calc(100vw - 48px));
  --container-narrow: min(960px, calc(100vw - 48px));
  --transition: 200ms cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-slow: 380ms cubic-bezier(0.2, 0.7, 0.2, 1);

  /* Effects */
  --shadow-md: 0 8px 24px -10px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.65);
  --glow-amber: 0 0 20px -5px rgba(232, 163, 61, 0.45);
  --glow-green: 0 0 14px -3px rgba(93, 211, 158, 0.5);
}

/* ---------- reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;

  /* Subtle HMI grid background — auto-adjusts to viewport */
  background-image:
    linear-gradient(var(--grid) 0.5px, transparent 0.5px),
    linear-gradient(90deg, var(--grid) 0.5px, transparent 0.5px),
    radial-gradient(ellipse 80% 60% at 12% -5%, rgba(232, 163, 61, 0.06), transparent 55%),
    radial-gradient(ellipse 60% 50% at 95% 8%, rgba(91, 192, 222, 0.05), transparent 60%);
  background-size: 32px 32px, 32px 32px, 100% 100%, 100% 100%;
  background-attachment: fixed;
}

body.menu-open { overflow: hidden; }

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection { background: var(--amber); color: var(--bg); }

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px; height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  left: 16px; top: 16px; width: auto; height: auto;
  padding: 10px 16px;
  background: var(--amber);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  z-index: 200;
}

/* ---------- typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.018em;
  line-height: 1.1;
  color: var(--text);
  margin: 0;
}

h1 { font-size: clamp(2.4rem, 5.2vw, 4.2rem); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.7rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.15rem, 1.7vw, 1.45rem); }

p { margin: 0; }

.lead {
  font-size: clamp(1rem, 1.15vw, 1.1rem);
  color: var(--text-2);
  max-width: 60ch;
  line-height: 1.65;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 400;
  color: var(--muted);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--amber);
  font-weight: 500;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: var(--glow-amber);
}

.amber { color: var(--amber); }
.cyan { color: var(--cyan); }
.green { color: var(--green); }

/* HMI equation signature — minimal single-line caption, like Ali's site */
.signature {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.01em;
  display: block;
  white-space: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
  padding-bottom: 2px;
}
.signature::-webkit-scrollbar { height: 2px; }
.signature::-webkit-scrollbar-track { background: transparent; }
.signature::-webkit-scrollbar-thumb { background: var(--rule-strong); }
.signature .eq {
  color: var(--text);
}
.signature .term { color: var(--cyan); }
.signature .dash { color: var(--dim); margin: 0 6px; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(20px, 3vw, 32px);
  background: rgba(14, 17, 22, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 0.5px solid var(--rule);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand-mark {
  width: 36px; height: 36px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 0.5px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--amber);
  letter-spacing: 0;
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border: 0.5px solid var(--rule);
  pointer-events: none;
}
.brand-text { display: grid; min-width: 0; line-height: 1.1; }
.brand-name {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-role {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-top: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-2);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--amber);
  transition: right var(--transition);
}
.nav-link:hover,
.nav-link.is-active { color: var(--amber); }
.nav-link.is-active::after,
.nav-link:hover::after { right: 0; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.sys-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px 6px 12px;
  background: var(--surface);
  border: 0.5px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
}
.sys-status::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  box-shadow: var(--glow-green);
  animation: pulseGreen 2.4s ease-in-out infinite;
}
@keyframes pulseGreen {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 0.5px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text);
  transition: all var(--transition);
}
.lang-toggle:hover {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bg);
}

.menu-toggle {
  display: none;
  width: 38px; height: 38px;
  border: 0.5px solid var(--rule-strong);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.menu-toggle span {
  display: block;
  width: 16px; height: 1.5px;
  background: var(--text);
  transition: transform var(--transition);
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---------- mobile drawer ---------- */
.mobile-drawer {
  position: fixed;
  inset: 64px 0 0 0;
  z-index: 70;
  background: var(--bg);
  padding: 32px 28px;
  border-top: 0.5px solid var(--rule);
  transform: translateY(-100%);
  transition: transform var(--t-slow);
  overflow-y: auto;
}
.mobile-drawer[data-open="true"] { transform: translateY(0); }
.mobile-drawer nav { display: flex; flex-direction: column; gap: 2px; }
.mobile-drawer .nav-link {
  font-size: 1rem;
  padding: 14px 0;
  border-bottom: 0.5px solid var(--rule);
  letter-spacing: 0.12em;
}

/* ---------- section shell ---------- */
section {
  position: relative;
  padding: clamp(64px, 8vw, 110px) 0;
}
section + section { border-top: 0.5px solid var(--rule); }

.container {
  width: var(--container);
  margin: 0 auto;
}

.section-head {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
}

.panel-tab {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 6px;
}
.panel-tab-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}
.panel-tab-rev { display: none; }
.panel-tab-bar {
  margin-top: 2px;
  height: 0.5px;
  background: var(--rule-strong);
  width: 100%;
}

.section-title h2 { max-width: 22ch; }
.section-title .lead { margin-top: 22px; }

.section-title .signature {
  margin-top: 18px;
  padding: 0;
  background: none;
  border: none;
  max-width: 100%;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 500;
  transition: all var(--transition);
  border: 0.5px solid var(--rule-strong);
  background: var(--surface);
  color: var(--text);
}
.btn:hover {
  border-color: var(--amber);
  color: var(--amber);
}
.btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--bg);
}
.btn-primary:hover {
  background: var(--amber-hover);
  border-color: var(--amber-hover);
  color: var(--bg);
}
.btn::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 0.85rem;
  transition: transform var(--transition);
}
.btn:hover::after { transform: translateX(3px); }
.btn.no-arrow::after { display: none; }

/* ---------- hero ---------- */
.hero {
  padding-top: clamp(48px, 6vw, 80px);
  padding-bottom: clamp(60px, 8vw, 110px);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  padding-bottom: 22px;
  margin-bottom: 36px;
  border-bottom: 0.5px solid var(--rule);
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.hero-meta .live {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: var(--glow-green);
  animation: pulseGreen 2.4s ease-in-out infinite;
}
.hero-meta .sep { color: var(--dim); }

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: start;
}
.hero-copy { min-width: 0; }
.hero-copy h1 {
  margin-top: 18px;
  letter-spacing: -0.025em;
}
.hero-copy h1 .amber { color: var(--amber); }
.hero-copy .lead { margin-top: 26px; max-width: 52ch; }

.hero-readouts {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 0.5px solid var(--rule);
}
.readout {
  padding: 12px 14px;
  background: var(--surface);
  display: grid;
  gap: 4px;
}
.readout-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.readout-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text);
  letter-spacing: 0.01em;
}
.readout-value .unit {
  color: var(--muted);
  font-size: 0.78rem;
  margin-left: 4px;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Hero rotor panel */
.hero-panel {
  background: var(--surface);
  border: 0.5px solid var(--rule);
  padding: 24px;
  position: relative;
}
.hero-panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 0.5px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.hero-panel-head .id { color: var(--amber); }
.hero-panel-head .meta { color: var(--muted); }

.hero-panel-frame {
  position: relative;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  background: var(--bg-2);
  border: 0.5px solid var(--rule);
  overflow: hidden;
}
.hero-panel-frame::before,
.hero-panel-frame::after {
  content: "";
  position: absolute;
  background: var(--rule-strong);
}
.hero-panel-frame::before {
  top: 50%; left: 0; right: 0;
  height: 0.5px;
  opacity: 0.4;
}
.hero-panel-frame::after {
  left: 50%; top: 0; bottom: 0;
  width: 0.5px;
  opacity: 0.4;
}

.rotor-svg {
  width: 88%; height: 88%;
  position: relative;
  z-index: 2;
}

.hero-panel-foot {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: none;
  color: var(--muted);
}
.hero-panel-foot strong {
  color: var(--text);
  font-weight: 400;
  white-space: nowrap;
  overflow-x: auto;
  display: inline-block;
  max-width: 100%;
  scrollbar-width: thin;
}
.hero-panel-foot .badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 8px;
  background: var(--green-soft);
  border: 0.5px solid var(--green);
  color: var(--green);
}
.hero-panel-foot .badge::before {
  content: "";
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--green);
}

/* ---------- profile section ---------- */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 0.5px solid var(--rule);
}
.focus-card {
  background: var(--surface);
  padding: 28px 26px 30px;
  position: relative;
  display: grid;
  gap: 14px;
  align-content: start;
}
.focus-card::before {
  content: attr(data-num);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.focus-card h3 { font-size: 1.15rem; line-height: 1.3; }
.focus-card p { color: var(--text-2); font-size: 0.95rem; line-height: 1.6; }

/* ---------- projects section ---------- */
.projects-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
  padding: 14px 18px;
  background: var(--surface);
  border: 0.5px solid var(--rule);
}
.toolbar-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-right: 4px;
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
  border: 0.5px solid var(--rule-strong);
  background: var(--bg-2);
  transition: all var(--transition);
}
.filter-btn::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--dim);
  transition: background var(--transition), box-shadow var(--transition);
}
.filter-btn:hover { color: var(--amber); border-color: var(--amber); }
.filter-btn[aria-pressed="true"] {
  color: var(--amber);
  border-color: var(--amber);
  background: var(--amber-soft);
}
.filter-btn[aria-pressed="true"]::before {
  background: var(--amber);
  box-shadow: var(--glow-amber);
}

.project-list {
  display: grid;
  gap: 24px;
}
.project-card {
  background: var(--surface);
  border: 0.5px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  position: relative;
  overflow: hidden;
  min-height: 380px;
}
.project-card[hidden] { display: none; }
.project-text {
  padding: 32px 32px 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-right: 0.5px solid var(--rule);
}
.project-text > .project-cta {
  margin-top: auto;
}
.project-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.project-num { color: var(--amber); }
.project-num span { color: var(--text); }
.project-status {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 9px;
  border: 0.5px solid currentColor;
  font-size: 0.58rem;
}
.project-status.commissioned { color: var(--green); }
.project-status.testing { color: var(--amber); }
.project-status.analysis { color: var(--cyan); }
.project-status::before {
  content: "";
  width: 5px; height: 5px; border-radius: 50%;
  background: currentColor;
}

.project-kicker {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.project-card h3 {
  font-size: 1.4rem;
  line-height: 1.25;
  margin: 4px 0 8px;
}
.project-summary {
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 8px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}
.project-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  padding: 4px 9px;
  background: var(--bg-2);
  border: 0.5px solid var(--rule-strong);
  color: var(--text-2);
}

.project-cta {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  align-self: start;
  padding-bottom: 4px;
  border-bottom: 0.5px solid var(--amber);
  transition: gap var(--transition);
}
.project-cta:hover { gap: 12px; }
.project-cta::after { content: "→"; }

.project-visual {
  margin: 0;
  background: var(--bg-2);
  position: relative;
  display: flex;
  align-items: stretch;
  overflow: hidden;
}
.project-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: brightness(0.78) contrast(1.08) saturate(0.92);
  transition: filter var(--t-slow);
}
.project-card:hover .project-visual img { filter: brightness(0.9) contrast(1.05) saturate(0.98); }

.visual-caption {
  position: absolute;
  bottom: 12px; left: 14px; right: 14px;
  display: flex;
  justify-content: flex-start;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text);
  background: rgba(14, 17, 22, 0.78);
  padding: 7px 10px;
  border: 0.5px solid var(--rule-strong);
  backdrop-filter: blur(4px);
  width: fit-content;
}

/* ---------- thesis section ---------- */
.thesis-grid {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: 32px;
  align-items: start;
}
.thesis-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}
.thesis-bullets li {
  position: relative;
  padding: 14px 18px 14px 38px;
  background: var(--surface);
  border: 0.5px solid var(--rule);
  font-size: 0.95rem;
  color: var(--text-2);
  line-height: 1.55;
}
.thesis-bullets li::before {
  content: counter(thesis, decimal-leading-zero);
  counter-increment: thesis;
  position: absolute;
  left: 14px; top: 14px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}
.thesis-bullets { counter-reset: thesis; }

.thesis-card {
  background: var(--surface);
  border: 0.5px solid var(--rule);
  padding: 28px 28px 30px;
  display: grid;
  gap: 16px;
  align-content: start;
  position: relative;
}
.thesis-card::before {
  content: "TEZ ÖZETİ · M.SC.";
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.thesis-card h3 { font-size: 1.3rem; }
.thesis-card .lead { font-size: 0.95rem; color: var(--text-2); }
.thesis-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

/* ---------- experience timeline (simple numbered, like Ali's site) ---------- */
.experience-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: exp;
  display: grid;
  gap: 0;
}
.exp-item {
  display: grid;
  grid-template-columns: 56px 220px 1fr;
  gap: 24px;
  padding: 22px 0;
  align-items: start;
  border-bottom: 0.5px solid var(--rule);
  position: relative;
}
.exp-item:last-child { border-bottom: 0; }
.exp-num {
  counter-increment: exp;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--amber);
  letter-spacing: 0.02em;
  padding-top: 4px;
}
.exp-num::before {
  content: counter(exp, decimal-leading-zero) ".";
}
.exp-period {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding-top: 6px;
  text-transform: none;
}
.exp-body h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 500;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}
.exp-company {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
  margin-bottom: 10px;
  text-transform: none;
}
.exp-body p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.6;
  max-width: 64ch;
}
.exp-body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 4px;
}
.exp-body li {
  position: relative;
  padding-left: 0;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.6;
}
.exp-body li + li { margin-top: 2px; }

/* Section divider headers (DENEYİM / EĞİTİM) inside same flow */
.exp-section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin: 32px 0 10px;
  padding-top: 24px;
  border-top: 0.5px solid var(--rule);
}
.exp-section-label:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

/* ---------- education (numbered, like Ali's site) ---------- */
.education-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: edu;
  display: grid;
  gap: 0;
}
.degree {
  display: grid;
  grid-template-columns: 56px 220px 1fr;
  gap: 24px;
  padding: 22px 0;
  align-items: start;
  border-bottom: 0.5px solid var(--rule);
}
.degree:last-child { border-bottom: 0; }
.degree-num {
  counter-increment: edu;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--amber);
  padding-top: 4px;
}
.degree-num::before {
  content: counter(edu, decimal-leading-zero) ".";
}
.degree-period {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  padding-top: 6px;
  text-transform: none;
}
.degree h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}
.degree-inst {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
  text-transform: none;
  margin-bottom: 8px;
}
.degree p {
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.6;
  max-width: 64ch;
  margin: 0;
}

/* ---------- experience & education two-column grid ---------- */
.exp-edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 60px;
  align-items: start;
}
.exp-edu-grid .exp-col,
.exp-edu-grid .edu-col {
  min-width: 0; /* prevent grid blowout */
}
.exp-edu-grid .exp-section-label {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}
.exp-edu-grid .exp-item,
.exp-edu-grid .degree {
  grid-template-columns: 40px 1fr;
  grid-template-areas:
    "num period"
    "num body";
  gap: 4px 16px;
  padding: 18px 0;
}
.exp-edu-grid .exp-item .exp-num,
.exp-edu-grid .degree .degree-num {
  grid-area: num;
  padding-top: 4px;
}
.exp-edu-grid .exp-item .exp-period,
.exp-edu-grid .degree .degree-period {
  grid-area: period;
  padding-top: 0;
}
.exp-edu-grid .exp-item .exp-body,
.exp-edu-grid .degree .degree-body {
  grid-area: body;
}
.exp-edu-grid .exp-body p,
.exp-edu-grid .degree p {
  max-width: none;
}

.academic-links {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 0.5px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.academic-links-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 12px;
  width: 100%;
}

/* ---------- toolkit (instrument cluster) ---------- */
.toolkit-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 0.5px solid var(--rule);
}
.tool-card {
  background: var(--surface);
  padding: 26px 22px 28px;
  display: grid;
  gap: 12px;
  align-content: start;
  position: relative;
  min-height: 200px;
}
.tool-card::before {
  content: attr(data-num);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}
.tool-card h3 {
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 500;
  line-height: 1.3;
}
.tool-card p {
  color: var(--text-2);
  font-size: 0.88rem;
  line-height: 1.55;
}
.tool-card-bar {
  margin-top: auto;
  height: 0.5px;
  background: var(--rule-strong);
  position: relative;
}
.tool-card-bar::after {
  content: "";
  position: absolute;
  left: 0; top: 0; height: 100%;
  width: 0;
  background: var(--amber);
  transition: width var(--t-slow);
}
.tool-card:hover .tool-card-bar::after { width: 100%; }

/* ---------- contact (simple block, like Ali's site) ---------- */
.contact-block {
  display: grid;
  gap: 16px;
}
.contact-grid-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}
.contact-info-col {
  display: grid;
  gap: 16px;
  max-width: 520px;
}
.contact-block .lead {
  margin-bottom: 12px;
}
.contact-row-simple {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 0.5px solid var(--rule);
  align-items: baseline;
}
.contact-row-simple .row-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact-row-simple .row-value {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--text);
}
.contact-row-simple .row-value a { transition: color var(--transition); }
.contact-row-simple .row-value a:hover { color: var(--amber); }
.contact-actions-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.social-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  background: var(--surface);
  border: 0.5px solid var(--rule-strong);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  transition: all var(--transition);
}
.social-chip::after { content: "↗"; font-size: 0.78rem; color: var(--muted); transition: all var(--transition); }
.social-chip:hover { border-color: var(--amber); color: var(--amber); }
.social-chip:hover::after { color: var(--amber); transform: translate(2px, -2px); }

/* ---------- contact form (HMI-style inputs) ---------- */
.contact-form-col {
  background: var(--surface);
  border: 0.5px solid var(--rule);
  padding: 28px 26px 26px;
  position: relative;
}
.form-tab {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.form-tab-num {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  white-space: nowrap;
}
.form-tab-bar {
  flex: 1;
  height: 0.5px;
  background: var(--rule-strong);
}
.contact-form {
  display: grid;
  gap: 14px;
}
.form-row {
  display: grid;
  gap: 6px;
}
.form-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.form-input {
  width: 100%;
  background: var(--bg-2);
  border: 0.5px solid var(--rule-strong);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  line-height: 1.5;
  padding: 10px 12px;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}
.form-input:hover {
  border-color: var(--rule-strong);
  background: var(--surface-2);
}
.form-input:focus {
  border-color: var(--amber);
  background: var(--surface-2);
  box-shadow: 0 0 0 1px rgba(232, 163, 61, 0.25);
}
.form-input:invalid:not(:placeholder-shown) {
  border-color: var(--red);
}
.form-textarea {
  resize: vertical;
  min-height: 110px;
  font-family: var(--font-sans);
}
.form-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 6px;
}
.form-hint {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.form-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--green);
  min-height: 1em;
  margin-top: 4px;
}
.form-status.is-error { color: var(--red); }

/* ---------- scroll-margin-top to prevent sticky header overlap ---------- */
section[id] {
  scroll-margin-top: 90px;
}
@media (max-width: 980px) {
  section[id] { scroll-margin-top: 72px; }
}

/* ---------- 404 / error page ---------- */
.error-page {
  padding: 80px 0 120px;
  min-height: 60vh;
  display: flex;
  align-items: center;
}
.error-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 56px;
  align-items: center;
  max-width: 880px;
}
.error-code {
  display: grid;
  gap: 8px;
  border: 0.5px solid var(--rule-strong);
  padding: 28px 36px;
  background: var(--surface);
  text-align: center;
  position: relative;
}
.error-num {
  font-family: var(--font-mono);
  font-size: 4.6rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--amber);
  line-height: 1;
}
.error-status {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}
.error-body .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 14px;
}
.error-body h1 {
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 14px;
}
.error-body .lead {
  color: var(--text-2);
  margin-bottom: 22px;
  max-width: 50ch;
}
@media (max-width: 720px) {
  .error-grid { grid-template-columns: 1fr; gap: 28px; }
  .error-code { padding: 22px; }
  .error-num { font-size: 3.6rem; }
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 0.5px solid var(--rule);
  padding: 36px 0 44px;
  background: var(--bg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
}
.footer-motto {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text);
  letter-spacing: 0.04em;
}
.footer-motto::before {
  content: "►";
  color: var(--amber);
  margin-right: 10px;
}
.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
}

/* ---------- toast ---------- */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%, 24px);
  padding: 12px 18px;
  background: var(--amber);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  border: 0.5px solid var(--bg);
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.toast.is-error { background: var(--red); color: var(--text); }

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 600ms ease-out, transform 600ms cubic-bezier(0.2, 0.7, 0.2, 1);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- rotor SVG animation ---------- */
.rotor-svg .stator-tooth { fill: var(--rule-strong); }
.rotor-svg .rotor-iron { fill: var(--surface-2); stroke: var(--rule-strong); stroke-width: 0.5; }
.rotor-svg .flux-barrier { fill: var(--bg-2); stroke: var(--rule-strong); stroke-width: 0.5; }
.rotor-svg .axis-d { stroke: var(--amber); stroke-width: 0.5; stroke-dasharray: 4 3; }
.rotor-svg .axis-q { stroke: var(--cyan); stroke-width: 0.5; stroke-dasharray: 4 3; }
.rotor-svg .flux-line {
  fill: none;
  stroke: var(--amber);
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-dasharray: 8 6;
  opacity: 0.7;
  animation: fluxFlow 3.6s linear infinite;
}
.rotor-svg .flux-line.delay1 { animation-delay: -0.9s; }
.rotor-svg .flux-line.delay2 { animation-delay: -1.8s; }
.rotor-svg .flux-line.delay3 { animation-delay: -2.7s; }
@keyframes fluxFlow {
  0% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -28; }
}
.rotor-svg .axis-label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--muted);
  letter-spacing: 0.1em;
}
.rotor-svg .axis-label.d { fill: var(--amber); }
.rotor-svg .axis-label.q { fill: var(--cyan); }
.rotor-svg .center-mark { fill: var(--amber); }

/* ---------- project subpage ---------- */
.subpage-hero {
  padding: clamp(60px, 7vw, 100px) 0 clamp(30px, 4vw, 50px);
  border-bottom: 0.5px solid var(--rule);
}
.subpage-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
  transition: color var(--transition);
}
.subpage-back::before { content: "←"; }
.subpage-back:hover { color: var(--amber); }

.subpage-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 18px;
  margin-bottom: 26px;
  border-bottom: 0.5px solid var(--rule);
}
.subpage-meta .amber { color: var(--amber); }
.subpage-meta .sep { color: var(--dim); }

.subpage-hero h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  letter-spacing: -0.02em;
  max-width: 22ch;
}
.subpage-lead {
  margin-top: 22px;
  font-size: clamp(1rem, 1.15vw, 1.1rem);
  color: var(--text-2);
  max-width: 64ch;
  line-height: 1.65;
}

.subpage-spec {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 0.5px solid var(--rule);
}
.subpage-spec .readout { padding: 14px 16px; }

.content-section { padding: clamp(40px, 5vw, 70px) 0; }
.content-section + .content-section { border-top: 0.5px solid var(--rule); }
.content-section h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  margin-bottom: 18px;
  max-width: 22ch;
}
.content-section h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  margin-top: 26px;
  margin-bottom: 12px;
}
.content-section p {
  color: var(--text-2);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 14px;
  max-width: 72ch;
}
.content-section ul {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.content-section ul li {
  position: relative;
  padding-left: 22px;
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.6;
}
.content-section ul li::before {
  content: "›";
  position: absolute; left: 0;
  color: var(--amber);
  font-family: var(--font-mono);
}

.content-figure {
  margin: 24px 0;
  background: var(--surface);
  border: 0.5px solid var(--rule);
  overflow: hidden;
}
.content-figure img { width: 100%; height: auto; display: block; }
.content-figure figcaption {
  padding: 10px 16px;
  border-top: 0.5px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}
.content-figure figcaption .id { color: var(--amber); }

.figure-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.subpage-foot {
  padding: clamp(32px, 4vw, 56px) 0 clamp(60px, 7vw, 90px);
  border-top: 0.5px solid var(--rule);
  display: grid;
  gap: 14px;
}
.subpage-foot .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- subpage scope grid ---------- */
.content-prose {
  display: grid;
  gap: 14px;
  margin-top: 14px;
  max-width: 72ch;
}
.content-prose p {
  color: var(--text-2);
  font-size: 0.98rem;
  line-height: 1.7;
  margin: 0;
}
.related-head {
  margin-bottom: 24px;
}
.scope-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: start;
  margin-top: 12px;
}
.scope-body { min-width: 0; }
.scope-highlights {
  background: var(--surface);
  border: 0.5px solid var(--rule);
  border-left: 2px solid var(--amber);
  padding: 22px 24px 24px;
  display: grid;
  gap: 12px;
  align-content: start;
}
.scope-highlights h3 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
  font-weight: 500;
  margin: 0;
}
.scope-highlights ul {
  margin: 0; padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.scope-highlights li {
  position: relative;
  padding-left: 18px;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.55;
}
.scope-highlights li::before {
  content: "›";
  position: absolute; left: 0;
  color: var(--amber);
  font-family: var(--font-mono);
}

/* ---------- related projects grid ---------- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 12px;
}
.related-card {
  background: var(--surface);
  border: 0.5px solid var(--rule);
  padding: 24px 26px 26px;
  display: grid;
  gap: 10px;
  align-content: start;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}
.related-card:hover {
  border-color: var(--amber);
  background: var(--surface-2);
}
.related-kicker {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.related-card h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.35;
  margin: 0;
  color: var(--text);
}
.related-cta {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  align-self: start;
  padding-bottom: 4px;
  border-bottom: 0.5px solid var(--amber);
  transition: gap var(--transition);
}
.related-card:hover .related-cta { gap: 12px; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-readouts { grid-template-columns: repeat(4, 1fr); }
  .focus-grid, .toolkit-grid { grid-template-columns: repeat(2, 1fr); }
  .project-card { grid-template-columns: 1fr; min-height: auto; }
  .project-text { border-right: 0; border-bottom: 0.5px solid var(--rule); }
  .project-visual { min-height: 280px; aspect-ratio: 4/3; }
  .project-visual img { aspect-ratio: 4/3; }
  .thesis-grid, .education-grid, .contact-grid { grid-template-columns: 1fr; }
  .contact-grid-split { grid-template-columns: 1fr; gap: 36px; }
  .contact-info-col { max-width: none; }
  .section-head { grid-template-columns: 1fr; gap: 18px; }
  .panel-tab { flex-direction: row; align-items: center; gap: 12px; }
  .panel-tab-bar { flex: 1; height: 0.5px; }
  .desktop-nav, .sys-status { display: none; }
  .menu-toggle { display: flex; }
  .exp-item, .degree { grid-template-columns: 1fr; gap: 6px; padding: 18px 0; }
  .exp-num, .degree-num { display: none; }
  .exp-edu-grid { grid-template-columns: 1fr; gap: 0; }
  .exp-edu-grid .exp-item,
  .exp-edu-grid .degree {
    grid-template-columns: 1fr;
    grid-template-areas: none;
    gap: 6px;
  }
  .subpage-spec { grid-template-columns: repeat(2, 1fr); }
  .figure-grid { grid-template-columns: 1fr; }
  .scope-grid { grid-template-columns: 1fr; gap: 20px; }
  .related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root { --container: calc(100vw - 32px); }
  .topbar { padding: 12px 16px; gap: 12px; }
  .brand-role { display: none; }
  .hero-readouts { grid-template-columns: repeat(2, 1fr); }
  .focus-grid, .toolkit-grid { grid-template-columns: 1fr; }
  .project-text { padding: 24px 22px 26px; }
  .footer-grid { grid-template-columns: 1fr; gap: 16px; }
  .footer-meta { text-align: left; }
  .contact-row { grid-template-columns: 1fr; gap: 4px; }
  .row-label { font-size: 0.6rem; }
  .subpage-spec { grid-template-columns: 1fr 1fr; }
  body {
    background-size: 24px 24px, 24px 24px, 100% 100%, 100% 100%;
  }
  h1 { font-size: clamp(2rem, 8vw, 2.6rem); }
}