/* =========================================================
   POLİMER DÜNYASI — Ön Tanıtım Sayfası
   style.css
   Renk paleti: Derin lacivert / Midnight blue / Petroleum blue
   Beyaz / Açık gri / Kontrollü cyan-turkuaz / Sınırlı gümüş
   ========================================================= */

:root {
  /* --- Renkler --- */
  --navy-950: #060f1c;
  --navy-900: #0a1a2f;
  --navy-800: #0f2a44;
  --navy-700: #16385a;
  --petroleum: #0b4f5c;
  --petroleum-light: #0b7285;
  --cyan: #12b8c4;
  --cyan-light: #2fd3db;
  --silver: #c7cdd3;
  --white: #ffffff;
  --gray-050: #f6f8fa;
  --gray-100: #eef1f4;
  --gray-300: #cbd4dc;
  --gray-500: #6b7c8c;
  --gray-700: #3b4a58;
  --success: #1e8a5f;
  --error: #c0392b;

  /* --- Tipografi --- */
  --font-heading: 'Manrope', 'Inter', Arial, sans-serif;
  --font-body: 'Inter', Arial, sans-serif;

  /* --- Yüzeyler --- */
  --bg-body: var(--white);
  --bg-alt: var(--gray-050);
  --text-main: var(--navy-900);
  --text-muted: var(--gray-500);

  /* --- Ölçüler --- */
  --container-w: 1200px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-card: 0 4px 24px rgba(10, 26, 47, 0.08);
  --shadow-card-hover: 0 12px 32px rgba(10, 26, 47, 0.14);
  --transition: 0.25s ease;
}

/* =========================== RESET =========================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-main);
  background: var(--bg-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3 { font-family: var(--font-heading); margin: 0; color: var(--navy-900); }
p { margin: 0; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--navy-900);
  color: var(--white);
  padding: 10px 18px;
  z-index: 1000;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================== BUTONLAR =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 30px;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 6px;
  border: 2px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--petroleum-light), var(--navy-800));
  color: var(--white);
  box-shadow: 0 6px 18px rgba(11, 114, 133, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(11, 114, 133, 0.36); }
.btn-primary:focus-visible { outline: 3px solid var(--cyan-light); outline-offset: 2px; }

.btn-outline {
  background: transparent;
  color: var(--navy-900);
  border-color: var(--navy-800);
}
.btn-outline:hover { background: var(--navy-900); color: var(--white); }
.btn-outline:focus-visible { outline: 3px solid var(--cyan-light); outline-offset: 2px; }

.btn-sm { padding: 10px 18px; font-size: 0.74rem; }

.btn-submit {
  width: 100%;
  margin-top: 8px;
  position: relative;
}
.btn-submit[aria-busy="true"] .btn-text { opacity: 0.4; }
.btn-spinner {
  display: none;
  position: absolute;
  right: 20px;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.5);
  border-top-color: var(--white);
  border-radius: 50%;
}
.btn-submit[aria-busy="true"] .btn-spinner {
  display: inline-block;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* =========================== HEADER =========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-100);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
  height: 44px;
  width: 44px;
  object-fit: cover;
  object-position: 50% 28%;
  border-radius: 10px;
  border: 1px solid var(--gray-100);
  flex-shrink: 0;
}
.brand-text { font-family: var(--font-heading); font-size: 1.05rem; font-weight: 800; color: var(--navy-900); letter-spacing: -0.01em; white-space: nowrap; }
.brand-text strong { color: var(--petroleum-light); font-weight: 800; }

.main-nav ul {
  display: flex;
  gap: 32px;
}
.main-nav a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--gray-700);
  transition: color var(--transition);
  position: relative;
}
.main-nav a:hover, .main-nav a:focus-visible { color: var(--petroleum-light); }

.header-actions { display: flex; align-items: center; gap: 16px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: none;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 18px;
  margin: 0 auto;
  background: var(--navy-900);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================== HERO =========================== */
.hero {
  background: radial-gradient(ellipse at top right, var(--navy-800) 0%, var(--navy-900) 55%, var(--navy-950) 100%);
  color: var(--white);
  padding: 96px 0 100px;
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border: 1px solid rgba(47, 211, 219, 0.4);
  background: rgba(18, 184, 196, 0.08);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan-light);
  margin-bottom: 28px;
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-light);
  box-shadow: 0 0 0 0 rgba(47, 211, 219, 0.6);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(47, 211, 219, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(47, 211, 219, 0); }
  100% { box-shadow: 0 0 0 0 rgba(47, 211, 219, 0); }
}

.hero-title {
  font-size: clamp(2.1rem, 4vw, 3.4rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--white);
  margin-bottom: 26px;
}
.hero-desc {
  font-size: 1.06rem;
  color: rgba(255,255,255,0.82);
  max-width: 620px;
  margin-bottom: 36px;
}
.hero-cta-group { display: flex; flex-wrap: wrap; gap: 16px; }
.hero .btn-outline { color: var(--white); border-color: rgba(255,255,255,0.5); }
.hero .btn-outline:hover { background: var(--white); color: var(--navy-900); }

.hero-visual { display: flex; justify-content: center; align-items: center; }
.network-svg { width: 100%; max-width: 520px; height: auto; }

/* =========================== GENEL SECTION =========================== */
.section { padding: 96px 0; }
.section-problem, .section-buyers, .section-ecosystem { background: var(--bg-alt); }
.section-title {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 800;
  line-height: 1.32;
  text-align: center;
  max-width: 880px;
  margin: 0 auto 20px;
  color: var(--navy-900);
}
.section-lead {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  color: var(--gray-700);
  font-size: 1.02rem;
}
.section-form .section-title,
.section-final-cta .section-title { margin-bottom: 16px; }
.section-form .section-lead { margin-bottom: 48px; }

/* =========================== KART GRID =========================== */
.card-grid {
  display: grid;
  gap: 28px;
  margin-top: 56px;
}
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }

.premium-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}
.premium-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.card-index {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin-bottom: 14px;
}
.premium-card h3 {
  font-size: 1.08rem;
  margin-bottom: 12px;
  color: var(--navy-900);
}
.premium-card p { color: var(--gray-700); font-size: 0.95rem; }

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); border-color: rgba(18,184,196,0.35); }
.feature-icon {
  width: 46px;
  height: 46px;
  color: var(--petroleum-light);
  margin-bottom: 18px;
}
.feature-icon svg { width: 100%; height: 100%; }
.feature-card h3 { font-size: 1.02rem; margin-bottom: 10px; }
.feature-card p { color: var(--gray-700); font-size: 0.93rem; }

/* =========================== PLATFORM MODELİ - FLOW =========================== */
.flow-diagram {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 52px 0 40px;
}
.flow-step {
  flex: 1 1 160px;
  max-width: 200px;
  background: var(--navy-900);
  color: var(--white);
  border-radius: var(--radius-md);
  padding: 22px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-card);
}
.flow-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--cyan);
  color: var(--navy-950);
  font-weight: 800;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.flow-label { font-size: 0.82rem; font-weight: 700; letter-spacing: 0.02em; }
.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--cyan);
  font-weight: 700;
}

/* =========================== EKOSİSTEM =========================== */
.ecosystem-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin: 52px 0 40px;
}
.eco-step {
  background: var(--white);
  border: 1px solid var(--gray-300);
  color: var(--navy-900);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.03em;
  padding: 16px 32px;
  border-radius: 100px;
  box-shadow: var(--shadow-card);
}
.eco-step-final {
  background: var(--navy-900);
  color: var(--white);
  border-color: var(--navy-900);
}
.eco-arrow { color: var(--cyan); font-size: 1.2rem; font-weight: 700; }

/* =========================== FORM =========================== */
.section-form { background: var(--white); }
.application-form {
  max-width: 880px;
  margin: 0 auto;
  background: var(--gray-050);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 44px;
}
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 24px;
}
.form-field-full { grid-column: 1 / -1; }
.form-field label, fieldset legend {
  display: block;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--navy-900);
  margin-bottom: 8px;
}
fieldset { border: none; padding: 0; margin: 0; }
.req { color: var(--error); }

input[type="text"], input[type="email"], input[type="tel"], input[type="url"], select, textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: 0.94rem;
  font-family: inherit;
  background: var(--white);
  color: var(--text-main);
  transition: border-color var(--transition), box-shadow var(--transition);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--petroleum-light);
  box-shadow: 0 0 0 3px rgba(18,184,196,0.16);
}
input.invalid, select.invalid, textarea.invalid { border-color: var(--error); }
textarea { resize: vertical; min-height: 96px; }

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px 16px;
}
.checkbox-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-700);
  cursor: pointer;
}
.checkbox-item input { width: 17px; height: 17px; margin-top: 2px; accent-color: var(--petroleum-light); flex-shrink: 0; }
.consent-field { padding-top: 8px; border-top: 1px solid var(--gray-300); }
.consent-field .checkbox-item { font-size: 0.86rem; }

.field-error {
  display: block;
  color: var(--error);
  font-size: 0.78rem;
  margin-top: 6px;
  min-height: 1em;
}

.form-status {
  margin-top: 20px;
  padding: 0;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  text-align: center;
  transition: all var(--transition);
}
.form-status.success {
  padding: 18px 20px;
  background: rgba(30,138,95,0.1);
  color: var(--success);
  border: 1px solid rgba(30,138,95,0.3);
}
.form-status.error {
  padding: 18px 20px;
  background: rgba(192,57,43,0.08);
  color: var(--error);
  border: 1px solid rgba(192,57,43,0.3);
}
.form-status-title { display: block; font-size: 1rem; margin-bottom: 4px; letter-spacing: 0.02em; }

/* =========================== SON CTA =========================== */
.section-final-cta {
  text-align: center;
  background: linear-gradient(135deg, var(--navy-900), var(--navy-950));
  color: var(--white);
}
.section-final-cta .section-title { color: var(--white); }
.section-final-cta .section-lead { color: rgba(255,255,255,0.78); margin-bottom: 36px; }
.trust-note { margin-top: 20px; font-size: 0.82rem; color: rgba(255,255,255,0.5); }

/* =========================== FOOTER =========================== */
.site-footer { background: var(--navy-950); color: rgba(255,255,255,0.8); padding-top: 56px; }
.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo {
  height: 40px;
  width: 40px;
  object-fit: cover;
  object-position: 50% 28%;
  border-radius: 9px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
}
.footer-brand-text { font-family: var(--font-heading); font-weight: 800; font-size: 1rem; color: var(--white); letter-spacing: -0.01em; }
.footer-tagline { font-size: 0.82rem; letter-spacing: 0.04em; color: rgba(255,255,255,0.55); line-height: 1.6; }
.footer-status p { font-weight: 600; color: var(--cyan-light); font-size: 0.9rem; }
.footer-contact-title { display: block; font-size: 0.75rem; letter-spacing: 0.08em; color: rgba(255,255,255,0.45); margin-bottom: 8px; }
.footer-contact a { font-weight: 600; color: var(--white); }
.footer-contact a:hover { color: var(--cyan-light); }
.footer-bottom { padding: 20px 0; font-size: 0.78rem; color: rgba(255,255,255,0.4); text-align: center; }

/* =========================== SATICI ÖN BAŞVURU MODALI =========================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 20px;
  background: rgba(6, 15, 28, 0.72);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), visibility 0s linear var(--transition);
  overflow-y: auto;
}
.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity var(--transition), visibility 0s linear 0s;
}
.modal-panel {
  background: var(--white);
  border-radius: var(--radius-lg);
  width: min(880px, 100%);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(16px);
  transition: transform var(--transition);
  margin: auto;
}
.modal-overlay.is-open .modal-panel { transform: translateY(0); }
.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 28px;
  border-bottom: 1px solid var(--gray-100);
}
.modal-title { font-size: 1.15rem; font-weight: 800; line-height: 1.35; }
.modal-close {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  background: none;
  font-size: 1.05rem;
  color: var(--navy-900);
  transition: background var(--transition), border-color var(--transition);
}
.modal-close:hover { background: var(--gray-050); border-color: var(--gray-500); }
.modal-close:focus-visible { outline: 3px solid var(--cyan-light); outline-offset: 2px; }
.modal-body { padding: 28px; }
.modal-lead { color: var(--gray-700); font-size: 0.96rem; margin-bottom: 28px; }
.modal-preview-note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: -14px 0 28px;
  padding: 12px 14px;
  background: var(--gray-050);
  border: 1px solid var(--gray-100);
  border-radius: 10px;
  font-size: 0.86rem;
  color: var(--gray-700);
}
.modal-preview-note a { color: var(--petroleum-light); font-weight: 700; text-decoration: none; }
.modal-preview-note a:hover { text-decoration: underline; }
.modal-preview-note a:focus-visible { outline: 3px solid var(--cyan-light); outline-offset: 2px; }
.modal-preview-note-tag { color: var(--gray-500); font-size: 0.78rem; }
.modal-body .application-form {
  margin: 0;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  max-width: none;
}

@media (max-width: 640px) {
  .modal-overlay { padding: 0; }
  .modal-panel { border-radius: 0; width: 100%; min-height: 100%; margin: 0; }
  .modal-body { padding: 22px 18px; }
}

/* =========================== REVEAL ANIMASYON =========================== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* =========================== RESPONSIVE =========================== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .pes-hero-visual { order: -1; max-width: 420px; margin: 0 auto 24px; }
  .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: 68px 0 0 0;
    background: var(--white);
    padding: 24px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
    border-top: 1px solid var(--gray-100);
  }
  .main-nav.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .main-nav ul { flex-direction: column; gap: 4px; }
  .main-nav a { display: block; padding: 14px 8px; font-size: 1rem; border-bottom: 1px solid var(--gray-100); }
  .nav-toggle { display: flex; }
  .header-actions .btn-sm { display: none; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .hero { padding: 64px 0 72px; }
  .card-grid-3 { grid-template-columns: 1fr; }
  .flow-diagram { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .form-grid { grid-template-columns: 1fr; }
  .checkbox-grid { grid-template-columns: repeat(2, 1fr); }
  .application-form { padding: 28px 20px; }
  .footer-inner { grid-template-columns: 1fr; text-align: left; }
}