@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800;900&display=swap');

:root {
  --color-ink: #16171c;
  --color-ink-soft: #4c4f5a;
  --color-blue: #0030b8;
  --color-blue-dark: #00268f;
  --color-blue-tint: #e6ecfb;
  --color-paper: #ffffff;
  --color-cream: #f6f7fb;
  --color-line: #e3e5ee;

  --font-base: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container-w: 1140px;
  --radius: 14px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --space-7: 140px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 84px;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-ink);
  background: var(--color-paper);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

p {
  margin: 0;
}

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-blue-dark);
}

.eyebrow::before {
  content: '';
  width: 22px;
  height: 2px;
  background: var(--color-blue);
  border-radius: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  border: 2px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-blue-dark);
  transform: translateY(-1px);
}

.btn-ghost {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.btn-ghost:hover {
  border-color: var(--color-blue);
  color: var(--color-blue-dark);
}

.btn-ghost-light {
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.btn-ghost-light:hover {
  border-color: #fff;
}

/* Site header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.brand {
  font-size: 21px;
  font-weight: 900;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.brand .dot {
  color: var(--color-blue);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.main-nav ul {
  display: flex;
  gap: var(--space-3);
}

.main-nav a {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink-soft);
  padding: 8px 8px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.main-nav .btn,
.main-nav .btn:hover,
.main-nav .btn.active {
  color: #fff;
  border-bottom-color: transparent;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-ink);
  border-color: var(--color-blue);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
}

/* Hero */
.hero {
  padding: var(--space-6) 0 var(--space-5);
  background: var(--color-cream);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  right: -120px;
  top: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 60px solid var(--color-blue-tint);
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-5);
  align-items: center;
}

.hero-copy {
  max-width: 620px;
}

.hero h1 {
  font-size: clamp(2.3rem, 4.2vw, 3.3rem);
  margin-top: var(--space-2);
}

.hero h1 .accent {
  color: var(--color-blue);
}

.hero-lede {
  margin-top: var(--space-3);
  font-size: 19px;
  color: var(--color-ink-soft);
  max-width: 600px;
}

.hero-actions {
  margin-top: var(--space-4);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.hero-badges {
  margin-top: var(--space-4);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hero-badge {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-ink-soft);
}

.hero-badge strong {
  display: block;
  font-size: 22px;
  color: var(--color-blue);
  font-weight: 900;
}

.hero-photo {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 30px 60px -30px rgba(0, 48, 184, 0.35);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Section scaffolding */
section {
  padding: var(--space-6) 0;
}

.section-head {
  max-width: 660px;
  margin-bottom: var(--space-5);
}

.section-head.center {
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-top: var(--space-2);
}

.section-head p {
  margin-top: var(--space-2);
  color: var(--color-ink-soft);
  font-size: 17px;
}

.alt-bg {
  background: var(--color-cream);
}

/* Three pillars */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.pillar-card {
  padding: var(--space-4) var(--space-3);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-paper);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.pillar-card:hover {
  border-color: var(--color-blue);
  transform: translateY(-4px);
  box-shadow: 0 16px 32px -20px rgba(0, 48, 184, 0.25);
}

.pillar-index {
  font-size: 14px;
  font-weight: 800;
  color: var(--color-blue);
}

.pillar-card h3 {
  font-size: 20px;
  margin-top: var(--space-2);
}

.pillar-card p {
  margin-top: var(--space-1);
  font-size: 15px;
  color: var(--color-ink-soft);
}

/* Feature list (Sunum İçeriği) */
.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-4);
}

.feature-list li {
  font-size: 16px;
  color: var(--color-ink-soft);
  padding-left: 28px;
  position: relative;
}

.feature-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-blue);
  font-weight: 800;
}

/* Identity / Ahmet Usta */
.identity {
  background: var(--color-ink);
  color: #fff;
}

.identity .container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-5);
  align-items: center;
}

.identity-photo {
  width: 100%;
  height: 360px;
  aspect-ratio: 3 / 4;
  border-radius: var(--radius);
  overflow: hidden;
  background: #23252d;
}

.identity-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.identity-body .eyebrow {
  color: var(--color-blue-tint);
}

.identity-body .eyebrow::before {
  background: var(--color-blue-tint);
}

.identity-body h2 {
  margin-top: var(--space-2);
  font-size: clamp(1.8rem, 3vw, 2.3rem);
}

.identity-body p {
  margin-top: var(--space-2);
  color: #d3d5de;
  font-size: 17px;
  max-width: 680px;
}

.identity-tags {
  margin-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.identity-tags li {
  font-size: 13px;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #f1f1f4;
}

/* Expertise / Danışmanlık */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.expertise-card {
  padding: var(--space-3);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-paper);
}

.expertise-card .num {
  font-size: 13px;
  font-weight: 800;
  color: var(--color-blue);
}

.expertise-card h3 {
  margin-top: 10px;
  font-size: 19px;
}

.expertise-card p {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--color-ink-soft);
}

.expertise-card.wide {
  grid-column: span 1;
}

/* Curriculum accordion */
.curriculum {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.curriculum details {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-paper);
  overflow: hidden;
}

.curriculum summary {
  list-style: none;
  cursor: pointer;
  padding: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 16px;
}

.curriculum summary::-webkit-details-marker {
  display: none;
}

.curriculum summary .plus {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--color-blue);
  transition: transform 0.15s ease;
}

.curriculum details[open] summary .plus {
  transform: rotate(45deg);
}

.curriculum details[open] summary {
  border-bottom: 1px solid var(--color-line);
}

.curriculum-body {
  padding: var(--space-3);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
}

.curriculum-body li {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  padding-left: 18px;
  position: relative;
}

.curriculum-body li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-blue);
}

.outcomes {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background: var(--color-blue-tint);
  border-radius: var(--radius);
}

.outcomes h4 {
  font-size: 16px;
  color: var(--color-blue-dark);
}

.outcomes ul {
  margin-top: var(--space-2);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
}

.outcomes li {
  font-size: 14.5px;
  color: var(--color-ink-soft);
  padding-left: 18px;
  position: relative;
}

.outcomes li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-blue);
  font-weight: 800;
  font-size: 12px;
}

/* Books grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.book-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px -20px rgba(0, 48, 184, 0.25);
}

.book-cover {
  aspect-ratio: 1;
  background: var(--color-cream);
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 28px;
}

.book-info {
  padding: var(--space-2) var(--space-3) var(--space-3);
  border-top: 1px solid var(--color-line);
}

.book-info h4 {
  font-size: 16px;
}

.book-info span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--color-ink-soft);
}

/* Logo strip (marquee) */
.logo-strip {
  background: var(--color-cream);
}

.logo-strip .section-head {
  margin-bottom: var(--space-4);
}

.logo-grid {
  overflow: hidden;
  position: relative;
  width: 100%;
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.logo-track {
  display: flex;
  gap: 56px;
  align-items: center;
  padding: var(--space-2) 0;
  width: max-content;
  will-change: transform;
}

.logo-grid img {
  max-height: 40px;
  width: auto;
  flex-shrink: 0;
  filter: grayscale(1);
  opacity: 0.7;
  transition: opacity 0.15s ease, filter 0.15s ease;
}

.logo-grid img:hover {
  filter: none;
  opacity: 1;
}

/* Photo grid */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 220px;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.photo-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}

.photo-grid .tall {
  grid-row: span 2;
}

/* Testimonial */
.testimonial {
  border-left: 4px solid var(--color-blue);
  padding-left: var(--space-3);
  max-width: 720px;
  margin: var(--space-4) auto 0;
}

.testimonial p {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-ink);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: var(--space-3);
}

.testimonial cite {
  font-style: normal;
  font-size: 14px;
  color: var(--color-ink-soft);
}

/* FAQ */
.faq {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: var(--space-4);
}

.faq details {
  border-bottom: 1px solid var(--color-line);
  padding: var(--space-2) 0;
}

.faq summary {
  list-style: none;
  cursor: pointer;
  padding: var(--space-1) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 17px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary .plus {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--color-blue);
  transition: transform 0.15s ease;
}

.faq details[open] summary .plus {
  transform: rotate(45deg);
}

.faq-answer {
  margin-top: 10px;
  color: var(--color-ink-soft);
  font-size: 15.5px;
  max-width: 820px;
}

/* CTA band */
.cta-band {
  background: var(--color-blue);
  color: #fff;
  text-align: center;
}

.cta-band h2 {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
}

.cta-band p {
  margin-top: var(--space-2);
  font-size: 18px;
  color: #dbe3fa;
}

.cta-band .hero-actions {
  justify-content: center;
  margin-top: var(--space-4);
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--color-blue-dark);
}

.cta-band .btn-primary:hover {
  background: #eef2fd;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-6);
}

.contact-info-item {
  display: flex;
  gap: 16px;
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-line);
}

.contact-info-item:first-child {
  border-top: none;
  padding-top: 0;
}

.contact-info-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--color-blue-tint);
  color: var(--color-blue-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
}

.contact-info-item h4 {
  font-size: 15px;
}

.contact-info-item p,
.contact-info-item a {
  margin-top: 4px;
  font-size: 15px;
  color: var(--color-ink-soft);
}

.contact-info-item a:hover {
  color: var(--color-blue-dark);
}

.contact-note {
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: var(--color-blue-tint);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-blue-dark);
}

.contact-form {
  padding: var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-cream);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.form-field {
  margin-bottom: var(--space-2);
}

.form-field label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 6px;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--color-line);
  font-family: inherit;
  font-size: 15px;
  background: #fff;
}

.form-field textarea {
  min-height: 140px;
  resize: vertical;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-blue);
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* Footer */
.site-footer {
  background: var(--color-ink);
  color: #cfd0d8;
  padding: var(--space-5) 0 var(--space-3);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-brand {
  font-size: 20px;
  font-weight: 900;
  color: #fff;
}

.footer-brand p {
  margin-top: var(--space-2);
  font-size: 14px;
  color: #a4a6b2;
  max-width: 300px;
}

.footer-social {
  margin-top: var(--space-3);
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.footer-social a:hover {
  border-color: var(--color-blue);
  background: rgba(0, 48, 184, 0.2);
}

.footer-social svg {
  width: 16px;
  height: 16px;
  fill: #fff;
}

.footer-col h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #fff;
}

.footer-col ul {
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 14px;
  color: #cfd0d8;
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--color-blue-tint);
}

.footer-bottom {
  padding-top: var(--space-3);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: #8b8d99;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-bottom a {
  color: #8b8d99;
}

.footer-bottom a:hover {
  color: var(--color-blue-tint);
}

/* Responsive */
@media (max-width: 1080px) {
  .main-nav ul {
    display: none;
  }

  .main-nav.nav-open ul {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 84px;
    left: 0;
    right: 0;
    background: var(--color-paper);
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 8px 24px rgba(22, 23, 28, 0.1);
  }

  .main-nav.nav-open ul li {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-line);
  }

  .main-nav.nav-open ul li:last-child {
    border-bottom: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-photo {
    max-width: 420px;
  }

  .pillars,
  .expertise-grid {
    grid-template-columns: 1fr 1fr;
  }

  .photo-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .book-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .identity .container {
    grid-template-columns: 1fr;
  }

  .identity-photo {
    max-width: 260px;
    aspect-ratio: 1;
    height: auto;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    row-gap: var(--space-4);
  }

  .feature-list,
  .curriculum-body,
  .outcomes ul {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .pillars,
  .expertise-grid {
    grid-template-columns: 1fr;
  }

  .hero::after {
    width: 260px;
    height: 260px;
    right: -100px;
    top: -60px;
    border-width: 36px;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  section {
    padding: var(--space-5) 0;
  }

  .photo-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: 220px;
  }

  .photo-grid .tall {
    grid-row: span 1;
  }

  .book-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }
}