/* =====================================================================
 * Akceon — Tanıtım Sitesi
 * HMI tasarım sisteminden ilham alır, ama daha havadar / pazarlama dostu.
 * Tek bir CSS dosyası, tüm sayfalar tarafından paylaşılır.
 * ===================================================================== */

:root {
  /* ------ Brand ------------------------------------------------------- */
  --akceon-navy:       #1B2A4E;
  --akceon-navy-deep:  #0F1A33;
  --akceon-blue:       #3B9CD9;
  --akceon-blue-soft:  #6FB8E2;

  /* ------ Severity (HMI'dan birebir) --------------------------------- */
  --hmi-crit:    #dc2626;
  --hmi-warn:    #eab308;
  --hmi-warn-2:  #f59e0b;
  --hmi-ok:      #22c55e;
  --hmi-stale:   #a855f7;

  /* ------ Surface tokens (LIGHT default) ----------------------------- */
  --bg:          #fafaf9;   /* warm off-white, never pure paper */
  --bg-2:        #f4f4f5;
  --surface:     #ffffff;
  --surface-2:   #fafafa;
  --text:        #0a0a0a;
  --text-soft:   #27272a;
  --muted:       #71717a;
  --muted-2:     #a1a1aa;
  --border:      #e4e4e7;
  --border-soft: #ededee;
  --grid-line:   rgba(24, 24, 27, 0.045);

  /* ------ Accent (default: marka mavisi) ----------------------------- */
  --accent:        #3B9CD9;
  --accent-deep:   #1B2A4E;
  --accent-soft:   rgba(59, 156, 217, 0.10);
  --accent-stroke: rgba(59, 156, 217, 0.35);

  /* ------ Typography -------------------------------------------------- */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Roboto Mono", "Menlo", "Consolas", monospace;
  --font-display: var(--font-sans);

  /* ------ Layout ------------------------------------------------------ */
  --container: 1280px;
  --gutter: 32px;
  --section-pad-y: 120px;
  --radius-sm:  4px;
  --radius-md:  6px;
  --radius-lg:  8px;
  --radius-xl: 12px;
}

html[data-theme="dark"] {
  --bg:          #0a0a0a;
  --bg-2:        #050505;
  --surface:     #18181b;
  --surface-2:   #1f1f23;
  --text:        #fafafa;
  --text-soft:   #e4e4e7;
  --muted:       #a1a1aa;
  --muted-2:     #71717a;
  --border:      #27272a;
  --border-soft: #1f1f23;
  --grid-line:   rgba(244, 244, 245, 0.045);
}

/* ------ Reset --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ------ Container ----------------------------------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ------ Typography utilities ----------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.tag::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 1px;
}
.tag.tag--bare::before { display: none; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--text);
  margin: 0;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h1 { font-size: clamp(48px, 6.4vw, 88px); line-height: 0.98; font-weight: 700; }
h2 { font-size: clamp(32px, 3.8vw, 52px); line-height: 1.05; font-weight: 600; }
h3 { font-size: clamp(22px, 2.2vw, 28px); line-height: 1.2;  font-weight: 600; letter-spacing: -0.01em; }
h4 { font-size: 18px; line-height: 1.3; font-weight: 600; letter-spacing: 0; }

.lead {
  font-size: clamp(18px, 1.4vw, 22px);
  line-height: 1.5;
  color: var(--text-soft);
  text-wrap: pretty;
  max-width: 56ch;
}
p { margin: 0; text-wrap: pretty; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ------ Button ------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 48px;
  padding: 0 20px;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  background: var(--accent-deep);
  color: #ffffff;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.01em;
  transition: background 120ms ease;
}
.btn:hover { background: #0F1A33; }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn--ghost:hover { background: var(--surface); border-color: var(--text-soft); }
.btn .arrow { font-family: var(--font-mono); transition: transform 160ms ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* ------ Nav ---------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  max-width: var(--container);
  margin: 0 auto;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav__brand img { height: 36px; width: auto; }
html[data-theme="dark"] .nav__brand img { filter: invert(1) brightness(2); }
.nav__brand-sep {
  width: 1px; height: 18px; background: var(--border);
}
.nav__brand-name {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 24px;
}
.nav__link {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-md);
  transition: background 120ms ease, color 120ms ease;
}
.nav__link:hover { background: var(--surface); color: var(--text); }
.nav__link--active { color: var(--accent-deep); }
html[data-theme="dark"] .nav__link--active { color: var(--accent); }
.nav__cta { margin-left: auto; display: flex; gap: 12px; align-items: center; }
.nav__cta .btn { height: 38px; padding: 0 14px; font-size: 13px; }

/* ------ Sections ----------------------------------------------------- */
section { position: relative; }
.section {
  padding-top: var(--section-pad-y);
  padding-bottom: var(--section-pad-y);
}
.section--tight { padding-top: 80px; padding-bottom: 80px; }
.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: 64px;
}
.section__head .lead { margin-top: 16px; }
.section__head-left { max-width: 720px; }
.section__head-right { color: var(--muted); font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.2em; text-transform: uppercase; padding-bottom: 12px; }

/* ------ Card --------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
}

/* ------ Grid lines pattern (HMI sinoptik referans) ------------------ */
.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.9), transparent 70%);
}

/* ------ Footer ------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg);
  padding: 64px 0 32px;
  margin-top: 80px;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}
.footer h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
}
.footer__col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer__col a { color: var(--text-soft); font-size: 14px; }
.footer__col a:hover { color: var(--accent-deep); }
html[data-theme="dark"] .footer__col a:hover { color: var(--accent); }
.footer__brand-blurb { color: var(--muted); font-size: 14px; max-width: 36ch; margin-top: 16px; }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ------ Severity chips (HMI faceplate look) ------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 24px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background: var(--surface);
  color: var(--text-soft);
  border: 1px solid var(--border);
}
.chip--crit  { color: var(--hmi-crit);  border-color: rgba(220, 38, 38, 0.30);  background: rgba(220, 38, 38, 0.06); }
.chip--warn  { color: var(--hmi-warn-2); border-color: rgba(245, 158, 11, 0.30); background: rgba(245, 158, 11, 0.06); }
.chip--ok    { color: var(--hmi-ok);    border-color: rgba(34, 197, 94, 0.30);  background: rgba(34, 197, 94, 0.06); }
.chip--stale { color: var(--hmi-stale); border-color: rgba(168, 85, 247, 0.30); background: rgba(168, 85, 247, 0.06); }
.chip--info  { color: var(--accent-deep); border-color: var(--accent-stroke); background: var(--accent-soft); }
html[data-theme="dark"] .chip--info { color: var(--accent); }
.chip::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 1px;
  background: currentColor;
}
.chip--soft::before { display: none; }

/* ------ Hairline divider (mono-tag style) --------------------------- */
.hairline {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.hairline::before, .hairline::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ------ Reduced motion ---------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}