/* Genel Ayarlar, Değişkenler ve Fontlar */
:root {
  /* Sitenin masaüstünde yayılacağı maksimum genişlik */
  --content-width: 1100px;
  /* İçeriği tam ortalamak için dinamik boşluk hesaplaması */
  --pad: max(32px, calc((100% - var(--content-width)) / 2));
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 16px; /* 14px'ten 16px'e büyütüldü */
  line-height: 1.6;
  color: #333;
  background-color: #fff;
}

/* Tipografi - Başlıklar */
h1, h2, h3, .pnc-num {
  font-family: Cambria, Georgia, serif;
}

/* Navigasyon */
nav {
  background: #1B2A4A;
  padding: 20px var(--pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.nav-brand { color: #fff; font-weight: 700; font-size: 18px; letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  color: #B08D57;
  font-size: 13px;
  letter-spacing: 2px;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.2s;
}
.nav-links a:hover { color: #fff; }

/* Hero Bölümü */
.hero { background: #1B2A4A; padding: 90px var(--pad); position: relative; overflow: hidden; }
.hero-eyebrow { color: #B08D57; font-size: 13px; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 16px; }
.hero h1 { color: #fff; font-size: 52px; font-weight: 700; line-height: 1.15; margin-bottom: 24px; }
.hero p { color: #c5ccd8; font-size: 18px; max-width: 540px; margin-bottom: 36px; line-height: 1.6; }
.btn {
  display: inline-block; background: #B08D57; color: #fff; padding: 14px 28px;
  font-size: 14px; letter-spacing: 1.5px; text-transform: uppercase; border: none;
  cursor: pointer; transition: background 0.2s; border-radius: 4px; font-weight: 600;
}
.btn:hover { background: #967645; }
.bars { position: absolute; right: var(--pad); top: 50%; transform: translateY(-50%); display: flex; gap: 8px; }
.bar { width: 5px; border-radius: 2px; background: #B08D57; }

/* Gap Section */
.gap-section { padding: 70px var(--pad); background: #fff; border-bottom: 1px solid #e8e8e8; }
.gap-section p.lead { font-size: 22px; color: #1B2A4A; font-weight: 700; margin-bottom: 16px; font-family: Cambria, Georgia, serif; }
.gap-section p.body { font-size: 17px; color: #555; max-width: 750px; line-height: 1.7; }
.divider { width: 60px; height: 4px; background: #B08D57; margin: 20px 0; }

/* Servisler Başlangıç */
.services-header { padding: 70px var(--pad) 40px; background: #F4F4F2; }
.services-header .eyebrow { color: #B08D57; font-size: 13px; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 10px; }
.services-header h2 { color: #1B2A4A; font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.services-header p { color: #666; font-size: 16px; }

/* Servis Navigasyon Kartları */
.pillar-nav { display: grid; grid-template-columns: 1fr 1fr 1fr; width: 100%; max-width: 100%; }
.pillar-nav-card { padding: 40px var(--pad); cursor: pointer; transition: all 0.2s; border-right: 1px solid rgba(255,255,255,0.08); }
.pillar-nav-card:last-child { border-right: none; }
.pillar-nav-card:nth-child(1) { background: #1B2A4A; }
.pillar-nav-card:nth-child(2) { background: #243761; }
.pillar-nav-card:nth-child(3) { background: #1B2A4A; }
.pillar-nav-card:hover { opacity: 0.95; transform: translateY(-4px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); z-index: 2; position: relative;}
.pnc-num { color: #B08D57; font-size: 36px; font-weight: 700; margin-bottom: 12px; }
.pnc-title { color: #fff; font-size: 20px; font-weight: 700; line-height: 1.3; margin-bottom: 12px; }
.pnc-desc { color: #9FA8C2; font-size: 15px; }
.pnc-arrow { color: #B08D57; font-size: 22px; margin-top: 20px; }

/* Servis Detayları (Pillars) */
.pillar { padding: 70px var(--pad); border-bottom: 1px solid #e8e8e8; }
.pillar:nth-child(odd) { background: #fff; }
.pillar:nth-child(even) { background: #F4F4F2; }
.pillar-label { color: #B08D57; font-size: 13px; letter-spacing: 2.5px; text-transform: uppercase; margin-bottom: 12px; font-weight: 600;}
.pillar h3 { color: #1B2A4A; font-size: 28px; font-weight: 700; margin-bottom: 10px; }
.pillar .tagline { color: #666; font-size: 16px; font-style: italic; margin-bottom: 24px; }
.pillar-body { font-size: 16px; color: #444; line-height: 1.7; margin-bottom: 30px; max-width: 800px; }

/* Tablolar & Trackler */
.tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 20px; }
.track-light { background: #fff; border: 1px solid #e3e3e0; padding: 30px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.03);}
.track-dark { background: #1B2A4A; padding: 30px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.track-title { font-size: 18px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 10px; }
.track-light .track-title { color: #1B2A4A; }
.track-dark .track-title { color: #B08D57; }
.track-sub { font-size: 15px; font-style: italic; margin-bottom: 16px; }
.track-light .track-sub { color: #777; }
.track-dark .track-sub { color: #c5ccd8; }
.track-list { font-size: 15px; line-height: 1.8; }
.track-light .track-list { color: #444; }
.track-dark .track-list { color: #e0e0e0; }
.track-foot { font-size: 14px; margin-top: 20px; font-weight: 700; padding-top: 14px; border-top: 1px solid rgba(0,0,0,0.08); }
.track-light .track-foot { color: #1B2A4A; }
.track-dark .track-foot { color: #B08D57; border-top-color: rgba(255,255,255,0.1); }
.pillar-note { font-size: 14px; color: #888; font-style: italic; margin-top: 24px; }

/* Fractional CMO Modelleri */
.models { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; margin-top: 24px; }
.model-card { padding: 24px; border-radius: 8px; }
.model-a, .model-c { background: #fff; border: 1px solid #e3e3e0; box-shadow: 0 4px 12px rgba(0,0,0,0.03); }
.model-b { background: #1B2A4A; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.model-label { font-size: 12px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 10px; font-weight: 700; color: #B08D57; }
.model-title { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.model-a .model-title, .model-c .model-title { color: #1B2A4A; }
.model-b .model-title { color: #fff; }
.model-for { font-size: 14px; font-style: italic; margin-bottom: 16px; }
.model-a .model-for, .model-c .model-for { color: #666; }
.model-b .model-for { color: #9FA8C2; }
.model-desc { font-size: 15px; line-height: 1.6; }
.model-a .model-desc, .model-c .model-desc { color: #555; }
.model-b .model-desc { color: #c5ccd8; }
.model-rhythm { font-size: 14px; margin-top: 16px; padding-top: 14px; border-top: 1px solid rgba(0,0,0,0.08); font-style: italic; }
.model-a .model-rhythm, .model-c .model-rhythm { color: #777; border-top-color: rgba(0,0,0,0.08); }
.model-b .model-rhythm { color: #9FA8C2; border-top-color: rgba(255,255,255,0.1); }

/* Execution Network */
.en-section { padding: 70px var(--pad); background: #fff; border-bottom: 1px solid #e8e8e8; }
.en-section .eyebrow { color: #B08D57; font-size: 13px; letter-spacing: 2.5px; text-transform: uppercase; margin-bottom: 12px; }
.en-section h3 { color: #1B2A4A; font-size: 28px; font-weight: 700; margin-bottom: 16px; }
.en-section p { color: #555; font-size: 16px; margin-bottom: 32px; max-width: 800px; line-height: 1.7; }
.en-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.en-card { background: #F4F4F2; border: 1px solid #e3e3e0; padding: 24px; border-radius: 8px; }
.en-card strong { display: block; color: #1B2A4A; font-size: 16px; margin-bottom: 8px; }
.en-card span { color: #555; font-size: 15px; }

/* Hakkında */
.about-section { padding: 70px var(--pad); background: #F4F4F2; border-bottom: 1px solid #e8e8e8; }
.about-section .eyebrow { color: #B08D57; font-size: 13px; letter-spacing: 2.5px; text-transform: uppercase; margin-bottom: 12px; }
.about-section h2 { color: #1B2A4A; font-size: 28px; font-weight: 700; margin-bottom: 24px; }
.about-section p { color: #444; font-size: 16px; margin-bottom: 16px; max-width: 800px; line-height: 1.7; }

/* İletişim */
.contact-section { background: #1B2A4A; padding: 70px var(--pad); }
.contact-section .eyebrow { color: #B08D57; font-size: 13px; letter-spacing: 2.5px; text-transform: uppercase; margin-bottom: 12px; }
.contact-section h2 { color: #fff; font-size: 28px; font-weight: 700; margin-bottom: 12px; }
.contact-section p { color: #c5ccd8; font-size: 16px; margin-bottom: 32px; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 600px; }
.contact-form input, .contact-form textarea {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.2);
  color: #fff; padding: 14px 16px; font-size: 16px; border-radius: 4px; outline: none; font-family: inherit;
}
.contact-form input::placeholder, .contact-form textarea::placeholder { color: #aaa; }
.contact-form textarea { grid-column: 1 / -1; height: 120px; resize: none; }
.contact-form .submit {
  grid-column: 1 / -1; background: #B08D57; color: #fff; border: none; padding: 16px;
  font-size: 14px; letter-spacing: 2px; text-transform: uppercase; cursor: pointer; border-radius: 4px; transition: background 0.2s; font-weight: 600;
}
.contact-form .submit:hover { background: #967645; }
.contact-info { margin-top: 32px; font-size: 16px; color: #9FA8C2; }
.contact-info a { color: #B08D57; text-decoration: none; display: block; margin-bottom: 8px; transition: color 0.2s; }
.contact-info a:hover { color: #fff; }

/* Yukarı Çık Butonu */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; background: #B08D57; color: #fff; border: none;
  border-radius: 50%; width: 50px; height: 50px; font-size: 24px; display: flex; justify-content: center;
  align-items: center; cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.3); opacity: 0;
  visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease; z-index: 100;
}
.back-to-top:hover { background: #967645; transform: translateY(-4px); }
.back-to-top.show { opacity: 1; visibility: visible; }

/* Mobil Uyum (Responsive) */
@media (max-width: 900px) {
  .pillar-nav { grid-template-columns: 1fr; }
  .pillar-nav-card { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .tracks, .models, .en-grid, .contact-form { grid-template-columns: 1fr; }
  .bars { display: none; } /* Mobilde sağdaki çubukları gizle */
  .hero h1 { font-size: 36px; }
  .nav-links { display: none; } /* Mobilde menüyü daraltır */
}