/* SolarDesk — site stilleri.
   Düzen fikri: mühendislik paftası. Koyu lacivert üst bölümde çizim, açık "kağıt" zeminde içerik;
   bölüm başlıkları ölçü çizgisi işaretiyle başlar, teknik bilgiler antet satırı gibi dizilir. */
:root {
  --navy-900: #131c2b;
  --navy-800: #1e293b;
  --navy-700: #2c3a51;
  --navy-line: #3a4a63;
  --paper: #f1f3f7;
  --surface: #ffffff;
  --ink: #16202f;
  --muted: #56637a;
  --line: #d3d9e3;
  --accent: #f05a2a;
  --accent-deep: #c2410f;
  --on-navy: #f4efe6;
  --on-navy-muted: #a9b4c6;
  --draw-steel: #dfe6f1;
  --draw-dim: #8f9db3;

  --font-display: 'Archivo', 'Arial Narrow', Arial, sans-serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --gutter: clamp(16px, 4vw, 40px);
  --section: clamp(56px, 8vw, 104px);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--font-body);
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--accent-deep); text-underline-offset: 0.18em; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { margin: 0; text-wrap: balance; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }

.wrap { width: 100%; max-width: 1200px; margin-inline: auto; padding-inline: var(--gutter); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip { position: absolute; left: var(--gutter); top: -100px; z-index: 30; background: var(--accent); color: var(--navy-900); padding: 10px 16px; font-weight: 600; }
.skip:focus { top: 8px; }

h1, h2, .closing h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 114%;
  line-height: 1.04;
  letter-spacing: -0.015em;
}
h1 { font-size: clamp(2.1rem, 5.2vw, 3.9rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.5rem); }
h3, .h3 { font-family: var(--font-display); font-weight: 700; font-stretch: 108%; font-size: 1.2rem; line-height: 1.25; letter-spacing: 0; }
.eyebrow { font: 500 0.8rem/1.4 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.lead { font-size: clamp(1.08rem, 1.5vw, 1.25rem); line-height: 1.55; max-width: 34em; }

/* ---------- Düğmeler ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 22px;
  font: 600 1rem/1 var(--font-body); text-decoration: none;
  border: 1.5px solid transparent; border-radius: 4px; cursor: pointer;
  transition: background-color .15s, border-color .15s, color .15s, transform .15s;
}
.btn--primary { background: var(--accent); color: var(--navy-900); }
.btn--primary:hover { background: #ff7a4d; color: var(--navy-900); }
.btn--ghost { border-color: var(--navy-line); color: var(--on-navy); }
.btn--ghost:hover { border-color: var(--on-navy); color: var(--on-navy); }
.btn--sm { min-height: 40px; padding: 0 16px; font-size: 0.92rem; }
.btn:active { transform: translateY(1px); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Üst bar ---------- */
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: var(--navy-900); color: var(--on-navy);
  border-bottom: 1px solid var(--navy-700);
}
.site-header__in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 68px; }
.logo img { height: 40px; width: auto; }
.site-nav { display: flex; align-items: center; gap: 4px 6px; }
.site-nav a:not(.btn) { color: var(--on-navy-muted); text-decoration: none; font-weight: 500; font-size: 0.95rem; padding: 10px 12px; border-radius: 4px; }
.site-nav a:not(.btn):hover, .site-nav a[aria-current="page"] { color: var(--on-navy); }
.site-nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--accent); border-radius: 0; }
.site-nav .lang { font: 500 0.82rem/1 var(--font-mono); letter-spacing: 0.06em; border: 1px solid var(--navy-line); margin-inline: 6px; padding: 9px 10px; }
.nav-toggle { display: none; width: 44px; height: 44px; background: none; border: 1px solid var(--navy-line); border-radius: 4px; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle__bars, .nav-toggle__bars::before, .nav-toggle__bars::after { display: block; width: 18px; height: 2px; background: var(--on-navy); content: ''; position: relative; }
.nav-toggle__bars::before { position: absolute; top: -6px; }
.nav-toggle__bars::after { position: absolute; top: 6px; }

@media (max-width: 860px) {
  .js .nav-toggle { display: inline-flex; }
  .site-header__in { flex-wrap: wrap; padding-block: 10px; }
  .site-nav { flex-basis: 100%; flex-wrap: wrap; padding-bottom: 6px; }
  .js .site-nav { display: none; flex-direction: column; align-items: stretch; gap: 2px; }
  .js .site-nav.is-open { display: flex; }
  .js .site-nav a:not(.btn) { padding: 12px 4px; }
  .js .site-nav .lang { align-self: flex-start; margin: 8px 0; padding: 9px 10px; }
  .js .site-nav a[aria-current="page"] { box-shadow: inset 2px 0 0 var(--accent); padding-left: 12px; }
}

/* ---------- Hero ---------- */
.hero, .page-head, .closing {
  color: var(--on-navy);
  background-color: var(--navy-800);
  background-image:
    linear-gradient(to right, rgb(255 255 255 / 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgb(255 255 255 / 0.035) 1px, transparent 1px),
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 55%, #24344d 100%);
  background-size: 32px 32px, 32px 32px, 100% 100%;
}
.hero__in { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); align-items: center; gap: clamp(24px, 4vw, 56px); padding-block: clamp(40px, 7vw, 88px) clamp(28px, 4vw, 48px); }
.hero__copy { display: flex; flex-direction: column; gap: 20px; min-width: 0; }
.hero .lead { color: var(--on-navy-muted); }
.hero .actions { margin-top: 8px; }
.hero__drawing { min-width: 0; }

.drawing { width: 100%; height: auto; display: block; overflow: visible; }
.drawing line, .drawing path, .drawing circle, .drawing polygon, .drawing rect { fill: none; vector-effect: non-scaling-stroke; }
.dw-ground line { stroke: var(--draw-dim); stroke-width: 1.5; }
.dw-hatch line { stroke-width: 1; opacity: .6; }
.dw-steel line { stroke: var(--draw-steel); stroke-width: 3.5; stroke-linecap: round; }
.dw-steel .dw-pile { stroke-dasharray: 5 5; stroke-width: 2; opacity: .7; }
.dw-steel .dw-brace { stroke-width: 2.25; }
.drawing .dw-purlin { stroke: var(--draw-steel); stroke-width: 1.75; fill: var(--navy-800); }
.drawing .dw-panel { stroke: var(--draw-steel); stroke-width: 1.5; fill: #3d5a86; }
.drawing .dw-head { fill: var(--accent); }
.dw-load, .dw-loadbar { stroke: var(--accent); stroke-width: 1.75; }
.dw-dim line, .dw-dim path { stroke: var(--draw-dim); stroke-width: 1; }
.dw-callouts line { stroke: var(--draw-dim); stroke-width: 1; }
.dw-axes circle { stroke: var(--draw-dim); stroke-width: 1; }
.drawing text { font-family: var(--font-mono); fill: var(--on-navy-muted); font-size: 12.5px; }
.drawing .dw-label--load { fill: var(--accent); font-size: 12px; letter-spacing: 0.06em; font-weight: 500; }
.drawing .dw-sym { font-size: 15px; font-style: italic; fill: var(--on-navy); }
.dw-axes text { font-size: 11px; fill: var(--on-navy-muted); }

@media (prefers-reduced-motion: no-preference) {
  .dw-anim { animation: dw-press 3.2s ease-in-out infinite; animation-delay: calc(var(--i) * 0.12s); }
  @keyframes dw-press { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }
}

.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--navy-line); }
.facts > div { padding: 18px 20px 22px 0; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.facts > div + div { padding-left: 20px; border-left: 1px solid var(--navy-line); }
.facts dt { font: 500 0.72rem/1.4 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--on-navy-muted); }
.facts dd { font: 500 1rem/1.3 var(--font-mono); color: var(--on-navy); font-variant-numeric: tabular-nums; }

/* ---------- Bölümler ---------- */
.section { padding-block: var(--section); }
.section--white { background: var(--surface); }
.section__head { display: flex; flex-direction: column; gap: 14px; margin-bottom: clamp(28px, 4vw, 48px); max-width: 44rem; }
.section__head h2::before {
  /* ölçü çizgisi işareti */
  content: ''; display: block; width: 56px; height: 9px; margin-bottom: 18px;
  border-inline: 2px solid var(--accent);
  background: linear-gradient(var(--accent), var(--accent)) center / 100% 2px no-repeat;
}
.section__head p { color: var(--muted); font-size: 1.1rem; }
.more { margin-top: 28px; }
.more a { font-weight: 600; }
.more a::after { content: ' →'; }

/* ---------- Adımlar (ana sayfa) ---------- */
.steps { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: clamp(20px, 4vw, 56px); align-items: start; }
.steps__list { position: relative; display: flex; flex-direction: column; }
.steps__list::before { content: ''; position: absolute; left: 6px; top: 28px; bottom: 28px; width: 1px; background: var(--line); }
.steps__item button {
  position: relative; display: flex; flex-direction: column; gap: 6px; width: 100%;
  padding: 16px 8px 16px 36px; text-align: left; background: none; border: 0; cursor: pointer;
  font: inherit; color: var(--muted);
}
.steps__item button::before {
  content: ''; position: absolute; left: 0; top: 22px; width: 13px; height: 13px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--line); transition: border-color .15s, background-color .15s;
}
.steps__title { font: 700 1.12rem/1.3 var(--font-display); font-stretch: 108%; color: var(--ink); }
.steps__text { font-size: 0.98rem; line-height: 1.5; }
.steps__item button:hover::before { border-color: var(--accent); }
.steps__item.is-active button::before { border-color: var(--accent); background: var(--accent); }
.js .steps__item:not(.is-active) .steps__text { display: none; }
.js .steps__item:not(.is-active) .steps__title { color: var(--muted); font-weight: 600; }
.steps__stage { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 92px); min-width: 0; }
.steps__panel { margin: 0; }
.steps__panel + .steps__panel { margin-top: 24px; }
.js .steps__panel { display: none; margin-top: 0; }
.js .steps__panel.is-active { display: block; }
.steps__panel img { aspect-ratio: 1600 / 850; object-fit: contain; }
.steps__panel img, .process img { width: 100%; border-radius: 6px; border: 1px solid var(--navy-700); box-shadow: 0 18px 40px -22px rgb(19 28 43 / 0.55); background: var(--navy-800); }

/* ---------- Güncellemeler ---------- */
.updates { display: flex; flex-direction: column; gap: clamp(36px, 6vw, 72px); }
.update { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 56px); align-items: center; }
.update:nth-child(even) .shot { order: 2; }
.update > div { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.update h3 { font-size: 1.45rem; }
.update p { color: var(--muted); }
.shot { border-radius: 6px; border: 1px solid var(--navy-700); box-shadow: 0 18px 40px -22px rgb(19 28 43 / 0.55); }

/* ---------- Üçlü liste ---------- */
.trio { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(20px, 3vw, 40px); }
.trio li { display: flex; flex-direction: column; gap: 10px; padding-top: 18px; border-top: 2px solid var(--ink); min-width: 0; }
.trio p { color: var(--muted); }

/* ---------- Kapanış ---------- */
.closing { padding-block: clamp(48px, 7vw, 88px); }
.closing__in { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 28px; }
.closing__in > div:first-child { display: flex; flex-direction: column; gap: 14px; max-width: 40rem; min-width: 0; }
.closing h2 { font-size: clamp(1.6rem, 3.4vw, 2.6rem); }
.closing p { color: var(--on-navy-muted); font-size: 1.1rem; }

/* ---------- İç sayfa başlığı ---------- */
.page-head { padding-block: clamp(44px, 7vw, 88px); }
.page-head .wrap { display: flex; flex-direction: column; gap: 18px; }
.page-head .lead { color: var(--on-navy-muted); }
.page-head--slim { padding-block: clamp(36px, 5vw, 64px); }
.page-head--slim h1 { font-size: clamp(1.9rem, 4vw, 3rem); }
.page-head--slim .eyebrow { color: var(--on-navy-muted); }

/* ---------- Yazılım sayfası ---------- */
.spec > div { display: grid; grid-template-columns: minmax(0, 15rem) minmax(0, 1fr); gap: 8px 32px; padding-block: 22px; border-top: 1px solid var(--line); }
.spec > div:last-child { border-bottom: 1px solid var(--line); }
.spec dt { font: 500 0.82rem/1.5 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-deep); padding-top: 3px; }
.spec dd { max-width: 42rem; }

.process { display: flex; flex-direction: column; gap: clamp(28px, 5vw, 56px); position: relative; }
.process li { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: clamp(20px, 4vw, 56px); align-items: center; }
.process__copy { display: flex; flex-direction: column; gap: 12px; padding-left: 28px; border-left: 2px solid var(--accent); min-width: 0; }
.process__copy h3 { font-size: 1.4rem; }
.process__copy p { color: var(--muted); }

/* ---------- İndir ---------- */
.download { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.download__files { display: flex; flex-direction: column; gap: 14px; }
.file { display: flex; flex-direction: column; gap: 6px; padding: 22px 24px; border: 1.5px solid var(--line); border-radius: 6px; text-decoration: none; color: var(--ink); transition: border-color .15s, background-color .15s; }
.file:hover { border-color: var(--ink); color: var(--ink); }
.file__name { font: 700 1.2rem/1.25 var(--font-display); font-stretch: 108%; }
.file__name::after { content: ' ↓'; color: var(--accent-deep); }
.file__meta { font: 400 0.85rem/1.4 var(--font-mono); color: var(--muted); }
.file--primary { background: var(--navy-800); border-color: var(--navy-800); color: var(--on-navy); }
.file--primary:hover { background: var(--navy-900); border-color: var(--navy-900); color: var(--on-navy); }
.file--primary .file__name::after { color: var(--accent); }
.file--primary .file__meta { color: var(--on-navy-muted); }
.reqs { margin-top: 14px; }
.reqs > div { display: grid; grid-template-columns: minmax(0, 9.5rem) minmax(0, 1fr); gap: 4px 20px; padding-block: 14px; border-top: 1px solid var(--line); }
.reqs > div:last-child { border-bottom: 1px solid var(--line); }
.reqs dt { font: 500 0.78rem/1.6 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); padding-top: 2px; }
.reqs dd { overflow-wrap: anywhere; }
.aside { margin-top: 24px; color: var(--muted); }
.aside strong { color: var(--ink); }
.aside a { font-weight: 600; white-space: nowrap; }

/* ---------- İletişim ---------- */
.contact { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 88px); align-items: start; }
.form { display: flex; flex-direction: column; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
label { font-weight: 500; font-size: 0.95rem; }
input, textarea {
  width: 100%; padding: 12px 14px; font: inherit; color: var(--ink);
  background: var(--paper); border: 1.5px solid var(--line); border-radius: 4px;
}
textarea { resize: vertical; min-height: 130px; }
input:hover, textarea:hover { border-color: var(--muted); }
input:focus-visible, textarea:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; border-color: var(--ink); background: var(--surface); }
.hint { font-size: 0.88rem; color: var(--muted); line-height: 1.45; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form__foot { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 20px; margin-top: 4px; }
.form__foot .hint { flex: 1 1 16rem; }
.form__status { padding: 14px 16px; border-radius: 4px; border-left: 4px solid var(--ink); background: var(--paper); font-weight: 500; }
.form__status.is-ok { border-left-color: #1f8a4c; }
.form__status.is-error { border-left-color: var(--accent-deep); }
.selectable { user-select: all; }
.copy { font: 500 0.75rem/1 var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; padding: 6px 8px; margin-left: 6px; background: none; border: 1px solid var(--line); border-radius: 4px; color: var(--muted); cursor: pointer; }
.copy:hover { border-color: var(--ink); color: var(--ink); }

/* ---------- Yasal metin ---------- */
.prose { max-width: 44rem; display: flex; flex-direction: column; gap: 14px; }
.prose h2 { font-size: 1.35rem; font-stretch: 108%; line-height: 1.25; letter-spacing: 0; margin-top: 28px; }
.prose ul { list-style: disc; padding-left: 1.3em; display: flex; flex-direction: column; gap: 4px; }
.prose .note { padding: 14px 16px; background: var(--paper); border-left: 4px solid var(--accent); font-size: 0.95rem; }

/* ---------- Alt bilgi ---------- */
.site-footer { background: var(--navy-900); color: var(--on-navy-muted); font-size: 0.95rem; }
.site-footer__in { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 0.7fr)) minmax(0, 1.3fr); gap: 32px clamp(20px, 4vw, 56px); padding-block: 56px 36px; }
.site-footer__brand { display: flex; flex-direction: column; gap: 16px; }
.site-footer__brand img { height: 44px; width: auto; align-self: flex-start; }
.site-footer h2 { font: 500 0.75rem/1.4 var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--on-navy); margin-bottom: 14px; }
.site-footer ul { display: flex; flex-direction: column; gap: 8px; }
.site-footer a { color: var(--on-navy-muted); text-decoration: none; overflow-wrap: anywhere; }
.site-footer a:hover { color: var(--on-navy); text-decoration: underline; }
.site-footer address { font-style: normal; margin-top: 14px; line-height: 1.5; }
.site-footer__legal { padding-block: 18px 28px; border-top: 1px solid var(--navy-700); font-size: 0.85rem; }

/* ---------- Dar ekran ---------- */
@media (max-width: 860px) {
  .hero__in, .steps, .update, .process li, .download, .contact { grid-template-columns: minmax(0, 1fr); }
  .hero__drawing { max-width: 520px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts > div:nth-child(3) { padding-left: 0; border-left: 0; }
  .facts > div:nth-child(n + 3) { border-top: 1px solid var(--navy-line); }
  .steps__stage { position: static; order: -1; }
  .update:nth-child(even) .shot { order: 0; }
  .trio { grid-template-columns: minmax(0, 1fr); }
  .process li img { order: -1; }
  .spec > div { grid-template-columns: minmax(0, 1fr); }
  .site-footer__in { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__brand, .site-footer__in > div:last-child { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .field-row { grid-template-columns: minmax(0, 1fr); }
  .reqs > div { grid-template-columns: minmax(0, 1fr); }
  .btn { flex: 1 1 auto; }
  .btn--sm { flex: 0 0 auto; align-self: flex-start; margin-top: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}