/* ============================================================
   Ceren Kimya — tasarım sistemi
   Renk: endüstriyel çelik grileri + kurumsal mavi (marka rengi)
   ============================================================ */

:root {
  /* Tip ölçeği */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);

  /* Boşluk */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --font-display: 'Cabinet Grotesk', 'Satoshi', system-ui, sans-serif;
  --font-body: 'Satoshi', 'Inter', system-ui, sans-serif;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 14px;

  --wrap: 1200px;
  --shadow-sm: 0 1px 2px rgba(12, 25, 38, 0.06), 0 1px 3px rgba(12, 25, 38, 0.05);
  --shadow-md: 0 6px 24px rgba(12, 25, 38, 0.08);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

:root,
[data-theme='light'] {
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-surface-2: #eef1f5;
  --color-ink: #0d1a26;
  --color-text: #24313d;
  --color-muted: #64717e;
  --color-border: #dde3ea;
  --color-primary: #0b4f9e;
  --color-primary-hover: #093f80;
  --color-on-primary: #ffffff;
  --color-hero-overlay: linear-gradient(90deg, rgba(9, 21, 33, 0.94) 0%, rgba(9, 21, 33, 0.78) 45%, rgba(9, 21, 33, 0.15) 100%);
}

[data-theme='dark'] {
  --color-bg: #0b1219;
  --color-surface: #121b24;
  --color-surface-2: #17222d;
  --color-ink: #eef3f8;
  --color-text: #c9d4de;
  --color-muted: #8fa0b0;
  --color-border: #24323f;
  --color-primary: #5aa2f0;
  --color-primary-hover: #7bb6f5;
  --color-on-primary: #06121f;
  --color-hero-overlay: linear-gradient(90deg, rgba(5, 11, 17, 0.96) 0%, rgba(5, 11, 17, 0.85) 45%, rgba(5, 11, 17, 0.3) 100%);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }
img { max-width: 100%; display: block; }

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }

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

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.section { padding-block: clamp(var(--space-12), 7vw, var(--space-24)); }

.eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-muted);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.lede { color: var(--color-muted); max-width: 62ch; }

/* --- Butonlar --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn--primary:hover { background: var(--color-primary-hover); color: var(--color-on-primary); }
.btn--ghost { background: transparent; color: var(--color-ink); border-color: var(--color-border); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--onDark { background: rgba(255, 255, 255, 0.1); color: #fff; border-color: rgba(255, 255, 255, 0.35); }
.btn--onDark:hover { background: rgba(255, 255, 255, 0.18); color: #fff; }
.btn--sm { padding: 0.45rem 0.8rem; font-size: var(--text-xs); }

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.header__bar {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: 72px;
}
.brand { display: flex; align-items: center; gap: var(--space-3); color: var(--color-ink); }
.brand__mark { color: var(--color-primary); flex: none; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.brand__sub {
  display: block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.nav { display: flex; gap: var(--space-6); margin-inline: auto; }
.nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
}
.nav a:hover, .nav a[aria-current='page'] { color: var(--color-ink); border-bottom-color: var(--color-primary); }
.header__actions { display: flex; align-items: center; gap: var(--space-3); }
.header__tel { font-size: var(--text-sm); font-weight: 700; color: var(--color-ink); white-space: nowrap; }
.header__tel:hover { color: var(--color-primary); }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}
.icon-btn:hover { color: var(--color-primary); border-color: var(--color-primary); }
.nav-toggle { display: none; }
.nav__cta { display: none; }

@media (max-width: 940px) {
  .nav {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-5) var(--space-5);
    transform: translateY(-120%);
    transition: transform 0.3s var(--ease);
    box-shadow: var(--shadow-md);
  }
  .nav[data-open='true'] { transform: translateY(0); }
  .nav a { padding-block: var(--space-4); border-bottom: 1px solid var(--color-border); }
  .nav a.nav__cta { display: block; font-weight: 700; color: var(--color-primary); }
  .nav__cta:last-child { border-bottom: 0; }
  .nav-toggle { display: inline-grid; }
  .header__tel { display: none; }
  .header__bar { justify-content: space-between; gap: var(--space-4); }
}

@media (max-width: 620px) {
  .brand__name { font-size: 0.95rem; white-space: nowrap; }
  .brand__sub { display: none; }
  .header__actions .btn { display: none; }
}

/* --- Hero --- */
.hero { position: relative; background: #091521; overflow: hidden; }
.hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero__scrim { position: absolute; inset: 0; background: var(--color-hero-overlay); }
.hero__inner {
  position: relative;
  padding-block: clamp(var(--space-16), 11vw, 8.5rem);
  max-width: 46rem;
}
.hero h1 {
  color: #fff;
  font-size: var(--text-2xl);
  margin-bottom: var(--space-5);
}
.hero .eyebrow { color: #8fc0f5; }
.hero p { color: rgba(255, 255, 255, 0.82); max-width: 44ch; font-size: var(--text-base); }
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

/* --- Güven şeridi --- */
.stats {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  padding-block: var(--space-8);
}
.stat__num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-ink);
  line-height: 1;
}
.stat__label { font-size: var(--text-sm); color: var(--color-muted); margin-top: var(--space-2); }
@media (max-width: 720px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-6) var(--space-4); }
}

/* --- Bölüm başlığı --- */
.sechead {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
}
.sechead h2 { font-size: var(--text-xl); }

/* --- Kategori kartları --- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.card:hover { border-color: var(--color-primary); transform: translateY(-3px); box-shadow: var(--shadow-md); }
.card__media { aspect-ratio: 4 / 3; background: var(--color-surface-2); overflow: hidden; }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.card:hover .card__media img { transform: scale(1.04); }
.card__body { padding: var(--space-5) var(--space-5) var(--space-6); display: flex; flex-direction: column; gap: var(--space-2); flex: 1; }
.card__body h3 { font-size: var(--text-lg); }
.card__body p { font-size: var(--text-sm); color: var(--color-muted); }
.card__meta {
  font-size: var(--text-xs);
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  padding-top: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.card__link { font-weight: 700; font-size: var(--text-sm); }

/* --- Marka şeridi --- */
.brands {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.brands li {
  list-style: none;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-ink);
}

/* --- İki sütun --- */
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(var(--space-8), 5vw, var(--space-16));
  align-items: center;
}
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }
.split img { border-radius: var(--radius-lg); }

.checklist { list-style: none; margin: var(--space-6) 0 0; padding: 0; display: grid; gap: var(--space-3); }
.checklist li { display: flex; gap: var(--space-3); font-size: var(--text-sm); }
.checklist svg { flex: none; color: var(--color-primary); margin-top: 3px; }

/* --- CTA bandı --- */
.cta {
  background: var(--color-ink);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-8), 5vw, var(--space-16));
  display: grid;
  grid-template-columns: 1.3fr auto;
  gap: var(--space-8);
  align-items: center;
}
[data-theme='dark'] .cta { background: var(--color-surface-2); border: 1px solid var(--color-border); }
.cta h2 { color: #fff; font-size: var(--text-xl); }
.cta p { color: rgba(255, 255, 255, 0.72); margin-top: var(--space-3); max-width: 48ch; font-size: var(--text-sm); }
.cta__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
@media (max-width: 760px) { .cta { grid-template-columns: 1fr; } }

/* --- Sayfa başlığı --- */
.pagehead {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
}
.pagehead h1 { font-size: var(--text-xl); margin-bottom: var(--space-4); }
.crumbs { font-size: var(--text-xs); color: var(--color-muted); margin-bottom: var(--space-4); }
.crumbs a { color: var(--color-muted); }
.crumbs a:hover { color: var(--color-primary); }

/* --- Ürün kataloğu --- */
.catalog { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: var(--space-10); align-items: start; }
.catalog > * { min-width: 0; }
@media (max-width: 900px) { .catalog { grid-template-columns: minmax(0, 1fr); } }

.sidebar {
  position: sticky;
  top: 96px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
@media (max-width: 900px) { .sidebar { position: static; } }
.sidebar h2 { font-size: var(--text-sm); font-family: var(--font-body); text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-muted); margin-bottom: var(--space-4); }
.sidebar ul { list-style: none; margin: 0 0 var(--space-5); padding: 0; display: grid; gap: var(--space-1); }
.sidebar a, .filter-btn {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: var(--text-sm);
  color: var(--color-text);
  background: none;
  border: 0;
  border-radius: var(--radius);
  padding: 0.5rem 0.65rem;
  cursor: pointer;
}
.filter-btn span { color: var(--color-muted); font-size: var(--text-xs); }
.sidebar a:hover, .filter-btn:hover { background: var(--color-surface-2); }
.filter-btn[aria-pressed='true'] { background: var(--color-primary); color: var(--color-on-primary); font-weight: 700; }
.filter-btn[aria-pressed='true'] span { color: inherit; }

.search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 0.55rem 0.75rem;
  margin-bottom: var(--space-6);
}
.search:focus-within { border-color: var(--color-primary); }
.search input { border: 0; background: none; font: inherit; font-size: var(--text-sm); color: var(--color-text); width: 100%; outline: none; }
.search svg { color: var(--color-muted); flex: none; }

.result-count { font-size: var(--text-sm); color: var(--color-muted); margin-bottom: var(--space-4); }

.group { margin-bottom: var(--space-12); }
.group > h2 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
.group > p { font-size: var(--text-sm); color: var(--color-muted); margin-bottom: var(--space-5); max-width: 68ch; }

.prod {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  margin-bottom: var(--space-3);
  overflow: hidden;
}
.prod__head {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-4);
  align-items: center;
  width: 100%;
  background: none;
  border: 0;
  font: inherit;
  text-align: left;
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
  color: var(--color-ink);
}
.prod__head:hover { background: var(--color-surface-2); }
.prod__name { font-weight: 700; font-size: var(--text-sm); }
.prod__tag {
  font-size: var(--text-xs);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  white-space: nowrap;
}
.prod__chev { color: var(--color-muted); transition: transform 0.25s var(--ease); }
.prod[open] .prod__chev { transform: rotate(180deg); }
.prod__body {
  padding: 0 var(--space-5) var(--space-5);
  display: grid;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text);
}
.prod__body dl { display: grid; grid-template-columns: 150px 1fr; gap: var(--space-2) var(--space-4); margin: 0; font-size: var(--text-sm); }
.prod__body dt { color: var(--color-muted); }
.prod__body dd { margin: 0; }
@media (max-width: 620px) { .prod__body dl { grid-template-columns: 1fr; gap: 0 0; } .prod__body dt { margin-top: var(--space-3); } }
.prod__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
@media (max-width: 620px) { .prod__head { grid-template-columns: 1fr auto; } .prod__tag { display: none; } }

.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-surface); }
table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: var(--text-sm); }
th, td { text-align: left; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border); }
th { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-muted); font-weight: 700; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--color-surface-2); }
td:first-child { font-weight: 700; color: var(--color-ink); white-space: nowrap; }

.empty { text-align: center; padding: var(--space-16) var(--space-6); color: var(--color-muted); border: 1px dashed var(--color-border); border-radius: var(--radius-lg); }

/* --- Form --- */
.form { display: grid; gap: var(--space-4); }
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-muted); }
.field input, .field select, .field textarea {
  font: inherit;
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
  width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 18%, transparent); }
.field textarea { min-height: 120px; resize: vertical; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 620px) { .form__row { grid-template-columns: 1fr; } }
.form__note { font-size: var(--text-xs); color: var(--color-muted); }
.form__ok {
  display: none;
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  border: 1px solid var(--color-primary);
  color: var(--color-ink);
  border-radius: var(--radius);
  padding: var(--space-4);
  font-size: var(--text-sm);
}

.info-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-5); }
.info-list dt { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-muted); margin-bottom: var(--space-1); }
.info-list dd { margin: 0; font-size: var(--text-sm); color: var(--color-ink); }

.map { border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; background: var(--color-surface-2); }
.map iframe { display: block; width: 100%; height: 380px; border: 0; filter: saturate(0.9); }

/* --- Footer --- */
.footer { background: var(--color-ink); color: rgba(255, 255, 255, 0.72); margin-top: var(--space-16); }
[data-theme='dark'] .footer { background: #070d13; border-top: 1px solid var(--color-border); }
.footer a { color: rgba(255, 255, 255, 0.72); }
.footer a:hover { color: #fff; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--space-8);
  padding-block: var(--space-16) var(--space-10);
}
@media (max-width: 860px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer__grid { grid-template-columns: 1fr; } }
.footer h3 { color: #fff; font-family: var(--font-body); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: var(--space-4); }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); font-size: var(--text-sm); }
.footer__brand { color: #fff; }
.footer__brand p { font-size: var(--text-sm); color: rgba(255, 255, 255, 0.6); margin-top: var(--space-4); max-width: 34ch; }
.social { display: flex; gap: var(--space-3); margin-top: var(--space-5); }
.social a {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.18);
}
.social a:hover { background: rgba(255, 255, 255, 0.1); }
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-block: var(--space-5);
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: var(--text-xs);
}

/* --- WhatsApp --- */
.wa {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: #1faa53;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.wa:hover { background: #178f44; color: #fff; transform: translateY(-2px); }

/* --- Animasyon --- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

.skip {
  position: absolute;
  left: -9999px;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-3) var(--space-4);
  z-index: 100;
}
.skip:focus { left: var(--space-4); top: var(--space-4); color: #fff; }