/* ==========================================================================
   time.kapteyan.com.tr
   Görsel yön: laboratuvar frekans standardı ön paneli.
   Soğuk beton grisi tezgâh, ivory panel yüzeyleri, çam yeşili "kilitli"
   göstergesi, yanık turuncu ibre. Tipografi tamamen IBM Plex ailesi.
   ========================================================================== */

:root {
  --bench:        #e3e6e2;   /* tezgâh zemini */
  --bench-deep:   #d5d9d4;
  --panel:        #fbfcfa;   /* panel yüzeyi */
  --panel-inset:  #f2f4f0;
  --ink:          #101519;
  --ink-soft:     #5b6770;
  --ink-faint:    #8b959c;
  --rule:         #ccd2cc;
  --rule-hard:    #aab3ab;

  --lock:         #0f5b52;   /* kilitli / senkron */
  --lock-deep:    #0a3b35;
  --lock-wash:    #e2efec;
  --needle:       #b8451c;   /* ibre / uyarı */
  --needle-wash:  #f7e9e2;
  --amber:        #a8720d;

  --shadow-panel: 0 1px 0 #ffffff inset, 0 1px 2px rgba(16, 21, 25, .06), 0 8px 24px -18px rgba(16, 21, 25, .5);

  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --cond: "IBM Plex Sans Condensed", "IBM Plex Sans", system-ui, sans-serif;
}

/* --- temel ------------------------------------------------------------- */

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
  background-color: var(--bench);
  background-image:
    linear-gradient(rgba(16, 21, 25, .028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 21, 25, .028) 1px, transparent 1px);
  background-size: 34px 34px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--lock); color: #fff; }

a { color: var(--lock); text-underline-offset: .18em; }
a:hover { color: var(--lock-deep); }

:focus-visible {
  outline: 2px solid var(--lock);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- yapısal parçalar --------------------------------------------------- */

.wrap { max-width: 1080px; margin-inline: auto; padding-inline: 1.25rem; }

.eyebrow {
  font-family: var(--cond);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.section { padding-block: 3.25rem; border-top: 1px solid var(--rule); }
.section-head { display: flex; align-items: baseline; gap: .9rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.section-head h2 {
  font-family: var(--cond);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -.01em;
  margin: 0;
}
.section-head p { margin: 0; color: var(--ink-soft); font-size: .9rem; }

.panel {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 3px;
  box-shadow: var(--shadow-panel);
}

/* --- üst şerit ---------------------------------------------------------- */

.topbar {
  position: sticky; top: 0; z-index: 30;
  background: rgba(227, 230, 226, .9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 3.4rem;
}
.brand {
  font-family: var(--mono);
  font-size: .92rem;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: .55rem;
}
.brand .dot {
  width: .5rem; height: .5rem; border-radius: 50%;
  background: var(--lock);
  box-shadow: 0 0 0 3px var(--lock-wash);
}
.topnav { display: flex; gap: 1.35rem; }
.topnav a {
  font-family: var(--cond);
  font-size: .78rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-soft); text-decoration: none;
}
.topnav a:hover { color: var(--lock); }
@media (max-width: 720px) { .topnav { display: none; } }

/* --- kadran (hero) ------------------------------------------------------ */

.dial { padding-block: 2.75rem 3rem; }

.dial-status {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--cond); font-size: .74rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
  padding: .3rem .7rem;
  border: 1px solid var(--rule-hard);
  border-radius: 2px;
  background: var(--panel);
  color: var(--ink-soft);
}
.lamp {
  width: .55rem; height: .55rem; border-radius: 50%;
  background: var(--ink-faint);
  transition: background .3s ease, box-shadow .3s ease;
}
.dial-status[data-state="lock"] { color: var(--lock-deep); border-color: var(--lock); }
.dial-status[data-state="lock"] .lamp { background: var(--lock); box-shadow: 0 0 0 3px var(--lock-wash); }
.dial-status[data-state="warn"] { color: var(--amber); border-color: var(--amber); }
.dial-status[data-state="warn"] .lamp { background: var(--amber); box-shadow: 0 0 0 3px #f6eddb; }
.dial-status[data-state="drift"] { color: var(--needle); border-color: var(--needle); }
.dial-status[data-state="drift"] .lamp { background: var(--needle); box-shadow: 0 0 0 3px var(--needle-wash); }

.clock {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(3.4rem, 13.5vw, 7.5rem);
  line-height: .95;
  letter-spacing: -.045em;
  font-variant-numeric: tabular-nums;
  margin: 1.1rem 0 0;
  display: flex; align-items: baseline; gap: .06em;
}
.clock .ms {
  font-size: .3em;
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--needle);
  align-self: flex-end;
  padding-bottom: .55em;
}
.clock-date {
  font-family: var(--cond);
  font-size: .95rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: .7rem;
}

/* saniye şeridi: 60 çentik */
.ticks {
  display: flex; gap: 2px; margin-top: 1.4rem; height: 26px; align-items: flex-end;
}
.ticks span {
  flex: 1 1 0;
  height: 9px;
  background: var(--rule);
  transition: height .12s ease, background .12s ease;
}
.ticks span.on   { background: var(--lock); height: 15px; }
.ticks span.now  { background: var(--needle); height: 26px; }
.ticks span:nth-child(5n + 1) { height: 14px; }
.ticks span.on:nth-child(5n + 1) { height: 20px; }

.dial-meta {
  display: flex; flex-wrap: wrap; gap: 1.75rem;
  margin-top: 1.6rem; padding-top: 1.1rem;
  border-top: 1px solid var(--rule);
}
.dial-meta div { display: flex; flex-direction: column; gap: .15rem; }
.dial-meta dt {
  font-family: var(--cond); font-size: .68rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase; color: var(--ink-faint);
}
.dial-meta dd {
  font-family: var(--mono); font-size: .95rem; font-weight: 500;
  font-variant-numeric: tabular-nums; margin: 0;
}

/* --- ibre / sapma ölçer (imza öğesi) ------------------------------------ */

.meter { padding: 1.5rem 1.5rem 1.25rem; }
.meter-title {
  display: flex; align-items: baseline; justify-content: space-between; gap: .5rem;
  margin-bottom: .25rem;
}
.meter svg { width: 100%; height: auto; display: block; }
.meter-face { fill: var(--panel-inset); stroke: var(--rule); }
.meter-arc { fill: none; stroke: var(--rule-hard); stroke-width: 1.2; }
.meter-band { fill: none; stroke: var(--lock); stroke-width: 4; opacity: .28; stroke-linecap: butt; }
.meter-tick { stroke: var(--rule-hard); stroke-width: 1.2; }
.meter-tick.major { stroke: var(--ink-soft); stroke-width: 1.6; }
.meter-label {
  font-family: var(--mono); font-size: 8.5px; font-weight: 500;
  fill: var(--ink-faint); text-anchor: middle;
}
.meter-needle {
  stroke: var(--needle); stroke-width: 2.4; stroke-linecap: round;
  transform-origin: 130px 108px;
  transition: transform .65s cubic-bezier(.34, 1.3, .64, 1);
}
.meter-hub { fill: var(--ink); }
.meter-readout {
  font-family: var(--mono); font-size: 1.5rem; font-weight: 600;
  font-variant-numeric: tabular-nums; letter-spacing: -.02em;
  margin: .35rem 0 0; text-align: center;
}
.meter-note { font-size: .78rem; color: var(--ink-soft); text-align: center; margin: .1rem 0 0; }

/* --- teknik künye ------------------------------------------------------- */

.spec-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: 3px; overflow: hidden; }
.spec {
  background: var(--panel); padding: 1.05rem 1.15rem;
  display: flex; flex-direction: column; gap: .3rem;
}
.spec dt {
  font-family: var(--cond); font-size: .68rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase; color: var(--ink-faint);
}
.spec dd { font-family: var(--mono); font-size: .95rem; font-weight: 500; margin: 0;  }

/* --- kılavuz ------------------------------------------------------------ */

.guide-nav { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1.4rem; }
.guide-nav .nav-link {
  font-family: var(--cond);
  font-size: .8rem; font-weight: 600; letter-spacing: .07em; text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: .42rem .85rem;
}
.guide-nav .nav-link:hover { border-color: var(--rule-hard); color: var(--ink); }
.guide-nav .nav-link.active { background: var(--lock); border-color: var(--lock); color: #fff; }

.guide-panel { padding: 1.5rem; }
.guide-panel h3 {
  font-family: var(--cond); font-size: 1.05rem; font-weight: 600;
  letter-spacing: .02em; margin: 0 0 .3rem;
}
.guide-panel .lead-note { color: var(--ink-soft); font-size: .9rem; margin-bottom: 1.15rem; }
.guide-panel h4 {
  font-family: var(--cond); font-size: .74rem; font-weight: 600;
  letter-spacing: .13em; text-transform: uppercase; color: var(--ink-faint);
  margin: 1.5rem 0 .5rem;
}
.guide-panel h4:first-of-type { margin-top: 0; }
.guide-panel ul { padding-left: 1.1rem; color: var(--ink-soft); font-size: .9rem; }
.guide-panel ul li { margin-bottom: .3rem; }

/* --- kod blokları ------------------------------------------------------- */

.code { position: relative; margin: 0 0 .75rem; }
.code pre {
  background: var(--ink);
  color: #e8ece9;
  font-family: var(--mono);
  font-size: .84rem;
  line-height: 1.7;
  padding: .95rem 5.5rem .95rem 1rem;
  border-radius: 3px;
  margin: 0;
  overflow-x: auto;
  tab-size: 2;
}
.code pre .c { color: #7f8f88; }
.code pre .k { color: #6fd3c0; }
.copy-btn {
  position: absolute; top: .55rem; right: .55rem;
  font-family: var(--cond); font-size: .68rem; font-weight: 600;
  letter-spacing: .1em; text-transform: uppercase;
  color: #b7c2bc;
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 2px;
  padding: .25rem .55rem;
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.copy-btn:hover { background: rgba(255, 255, 255, .16); color: #fff; }
.copy-btn.done { color: #7fe0c9; border-color: #7fe0c9; }

.file-tag {
  font-family: var(--mono); font-size: .74rem; color: var(--ink-soft);
  background: var(--panel-inset); border: 1px solid var(--rule);
  border-bottom: 0; border-radius: 3px 3px 0 0;
  padding: .3rem .7rem; display: inline-block;
}
.file-tag + .code pre { border-top-left-radius: 0; }

/* --- kural listesi ------------------------------------------------------ */

.rules { list-style: none; padding: 0; margin: 0; }
.rules li {
  display: flex; gap: .8rem; padding: .85rem 0;
  border-bottom: 1px solid var(--rule); font-size: .92rem;
}
.rules li:last-child { border-bottom: 0; }
.rules .no {
  font-family: var(--mono); font-size: .78rem; font-weight: 600;
  color: var(--lock); flex: 0 0 1.8rem; padding-top: .12rem;
}
.rules strong { display: block; font-weight: 600; }
.rules span { color: var(--ink-soft); font-size: .87rem; }

/* --- SSS ---------------------------------------------------------------- */

.faq .accordion-item { background: var(--panel); border: 1px solid var(--rule); border-radius: 3px !important; margin-bottom: .5rem; }
.faq .accordion-button {
  background: var(--panel); color: var(--ink);
  font-family: var(--sans); font-weight: 600; font-size: .95rem;
  padding: .95rem 1.1rem; border-radius: 3px !important; box-shadow: none;
}
.faq .accordion-button:not(.collapsed) { color: var(--lock-deep); background: var(--lock-wash); }
.faq .accordion-button:focus { box-shadow: none; border-color: var(--rule); }
.faq .accordion-body { font-size: .92rem; color: var(--ink-soft); padding: 0 1.1rem 1.1rem; }
.faq .accordion-body code { font-family: var(--mono); font-size: .86em; background: var(--panel-inset); padding: .1em .35em; border-radius: 2px; color: var(--ink); }

/* --- alt bilgi ---------------------------------------------------------- */

.foot {
  border-top: 1px solid var(--rule);
  padding-block: 2rem 2.75rem;
  font-size: .84rem;
  color: var(--ink-soft);
}
.foot .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.foot code { font-family: var(--mono); color: var(--ink); }

/* --- hareket tercihi ---------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .meter-needle, .ticks span { transition: none; }
}