/* ==========================================================================
   The Operator — landing page styles
   Design tokens live in :root. Mobile-first; breakpoints at 768px / 1200px.
   ========================================================================== */

:root {
  --color-bg: #F7F2E9;
  --color-accent: #7A1B1B;
  --color-accent-dark: #5E1414;
  --color-ink: #201C18;
  --color-cream-text: #FFFFFF;

  --font-display: "Cormorant Garamond", serif;
  --font-body: "Inter", sans-serif;

  --container-width: 1240px;
  --edge: clamp(20px, 5vw, 72px);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); margin: 0; font-weight: 600; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
svg { display: block; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }

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

/* ---------- Shared bits ---------- */
.eyebrow {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin: 0 0 12px;
}
.eyebrow.center { text-align: center; }
.diamond { color: var(--color-accent); font-size: 11px; vertical-align: middle; }

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
  letter-spacing: -.01em;
}
.section-title.center { text-align: center; margin: 0 auto 16px; max-width: 20ch; }
.section-sub {
  font-size: 15px;
  color: color-mix(in srgb, var(--color-ink) 70%, transparent);
  max-width: 46ch;
  margin-top: 14px;
}
.section-sub.center { text-align: center; margin-left: auto; margin-right: auto; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}
.btn-primary { background: var(--color-accent); color: var(--color-cream-text); }
.btn-primary:hover { background: var(--color-accent-dark); }
.btn-light { background: var(--color-cream-text); color: var(--color-accent); }
.btn-plus {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid currentColor;
  font-size: 11px;
  line-height: 1;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--color-ink);
  white-space: nowrap;
}
.link-arrow .btn-plus { color: var(--color-accent); border-color: var(--color-accent); width: 16px; height: 16px; font-size: 10px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-ink) 10%, transparent);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  padding-bottom: 18px;
  position: relative;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: .01em;
}
.logo-icon { width: 26px; height: 26px; color: var(--color-accent); flex-shrink: 0; }

.main-nav ul { display: flex; align-items: center; gap: 28px; }
.main-nav a {
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .02em;
  white-space: nowrap;
}
.main-nav a:hover { color: var(--color-accent); }

.header-cta { display: none; }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-ink);
  border-radius: 1px;
  transition: transform .2s ease, opacity .2s ease;
}
.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); }

/* mobile/tablet dropdown nav */
.main-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid color-mix(in srgb, var(--color-ink) 10%, transparent);
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
}
.main-nav.is-open { max-height: 320px; }
.main-nav ul { flex-direction: column; align-items: flex-start; gap: 0; padding: 8px var(--edge) 20px; }
.main-nav li { width: 100%; }
.main-nav a { display: block; padding: 12px 0; border-bottom: 1px solid color-mix(in srgb, var(--color-ink) 8%, transparent); }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding: 48px 0 56px;
  position: relative;
}
.hero-text { max-width: 52ch; }
.hero-text .eyebrow { margin-bottom: 16px; }
.display-h1 {
  font-size: clamp(38px, 8vw, 58px);
  line-height: 1.05;
  letter-spacing: -.01em;
}
.accent-text { color: var(--color-accent); }
.hero-tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 19px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid color-mix(in srgb, var(--color-ink) 18%, transparent);
}
.hero-desc {
  font-size: 15px;
  color: color-mix(in srgb, var(--color-ink) 72%, transparent);
  margin-top: 18px;
}
.hero-text .btn { margin-top: 28px; }
.hero-text .hero-secondary-link { display: flex; margin-top: 14px; }

.hero-media { position: relative; order: -1; }
.hero-media-backdrop {
  position: absolute;
  inset: 6% 8%;
  background: var(--color-accent);
  border-radius: 50%;
  z-index: 0;
}
.hero-img {
  position: relative;
  z-index: 1;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 4px;
}

.hero-social { display: flex; align-items: center; gap: 16px; }
.hero-social-label {
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-ink) 60%, transparent);
}
.hero-social a { width: 18px; height: 18px; color: var(--color-ink); }
.hero-social svg { width: 100%; height: 100%; }
.hero-social a:hover { color: var(--color-accent); }

/* ---------- Workflow ---------- */
.workflow { padding: 56px 0; }
.workflow-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 40px;
}
.workflow-step { text-align: center; }
.step-icon { width: 30px; height: 30px; margin: 0 auto 14px; color: var(--color-ink); }
.step-number {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
  color: var(--color-accent);
  margin-bottom: 6px;
}
.workflow-step h3 { font-size: 19px; margin-bottom: 8px; }
.workflow-step p {
  font-size: 13.5px;
  color: color-mix(in srgb, var(--color-ink) 66%, transparent);
  max-width: 26ch;
  margin: 0 auto;
}

/* ---------- Philosophy ---------- */
.philosophy {
  padding: 56px 0;
  border-top: 1px solid color-mix(in srgb, var(--color-ink) 10%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-ink) 10%, transparent);
}
.philo-quote { max-width: 42ch; margin: 0 auto; text-align: center; }
.philo-quote p {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.3;
  letter-spacing: -.01em;
}
.principles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 48px;
}
.principle { text-align: center; }
.principle h3 { font-size: 19px; margin-bottom: 8px; }
.principle p {
  font-size: 13.5px;
  color: color-mix(in srgb, var(--color-ink) 66%, transparent);
  max-width: 30ch;
  margin: 0 auto;
}

/* ---------- Why us ---------- */
.why-us { padding: 56px 0; }
.why-us .section-title { margin: 0 auto 8px; max-width: 24ch; }
.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 40px;
}
.why-item { text-align: center; }
.why-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
  color: var(--color-accent);
  margin-bottom: 6px;
}
.why-item h3 { font-size: 19px; margin-bottom: 8px; }
.why-item p {
  font-size: 13.5px;
  color: color-mix(in srgb, var(--color-ink) 66%, transparent);
  max-width: 28ch;
  margin: 0 auto;
}

/* ---------- Services ---------- */
.services { padding: 56px 0; }
.section-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.service-card { border: 1px solid color-mix(in srgb, var(--color-accent) 30%, transparent); padding: 10px; border-radius: 6px; }
.service-img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 3px; margin-bottom: 14px; }
.service-card h3 { font-size: 19px; margin-bottom: 4px; }
.service-tag { font-size: 12.5px; color: var(--color-accent); }
.service-benefit {
  font-size: 13.5px;
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-ink) 70%, transparent);
  margin-top: 8px;
}

/* ---------- Mentor 1:1 ---------- */
.mentor { padding: 56px 0; }
.mentor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}
.mentor-text .section-title { margin-top: 0; }
.mentor-stat {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--color-ink);
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
  border-left: 2px solid var(--color-accent);
  padding: 12px 16px;
  margin-top: 20px;
}
.mentor-audience {
  font-size: 15px;
  color: color-mix(in srgb, var(--color-ink) 70%, transparent);
  margin-top: 18px;
}
.mentor-audience strong { color: var(--color-ink); }
.mentor-text .btn { margin-top: 24px; }

.mentor-panel {
  border: 1px solid color-mix(in srgb, var(--color-accent) 30%, transparent);
  border-radius: 6px;
  padding: 24px;
}
.mentor-panel-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 18px;
}
.mentor-curriculum { display: grid; gap: 20px; }
.mentor-curriculum > li { display: grid; grid-template-columns: 2.4rem 1fr; gap: 0 16px; }
.mentor-num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.3;
  color: var(--color-accent);
}
.mentor-curriculum h3 { font-size: 16px; margin-bottom: 4px; }
.mentor-curriculum p {
  font-size: 13.5px;
  color: color-mix(in srgb, var(--color-ink) 66%, transparent);
}
.mentor-note {
  font-size: 12px;
  font-style: italic;
  color: color-mix(in srgb, var(--color-ink) 55%, transparent);
  margin-top: 18px;
}
.mentor-format {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid color-mix(in srgb, var(--color-ink) 12%, transparent);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--color-accent);
}

/* ---------- Case study ---------- */
.case-study { padding: 56px 0; }
.case-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: start;
}
.case-text .section-title { margin-top: 0; }
.case-text .link-arrow { margin-top: 22px; }
.case-media {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.case-item { margin: 0; }
.case-label {
  display: block;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 8px;
}
.case-item img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; border-radius: 3px; }

/* ---------- Du an showcase ---------- */
.duan-group { padding: 24px 0; }
.duan-group-title { font-size: clamp(20px, 2.6vw, 26px); margin-bottom: 20px; }
.duan-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.duan-card {
  border: 1px solid color-mix(in srgb, var(--color-accent) 25%, transparent);
  border-radius: 8px;
  overflow: hidden;
  background: color-mix(in srgb, var(--color-bg) 100%, #fff 0%);
}
.duan-img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.duan-noimg {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: 4px; font-size: 13px; font-weight: 600;
  color: color-mix(in srgb, var(--color-ink) 45%, transparent);
  background: color-mix(in srgb, var(--color-ink) 6%, transparent);
}
.duan-noimg span { font-size: 11.5px; font-weight: 400; opacity: .8; }
.duan-body { padding: 18px 20px 22px; }
.duan-body h3 { font-size: 19px; line-height: 1.3; margin-bottom: 12px; }
.duan-body h4 {
  font-family: var(--font-body); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-accent); font-weight: 700; margin: 14px 0 6px;
}
.duan-body h4:first-of-type { margin-top: 0; }
.duan-body ul { display: grid; gap: 6px; }
.duan-body li { font-size: 14px; line-height: 1.5; padding-left: 16px; position: relative; }
.duan-body li::before { content: "—"; position: absolute; left: 0; color: var(--color-accent); }

@media (min-width: 768px) {
  .duan-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1200px) {
  .duan-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- CTA banner ---------- */
.cta-banner { background: var(--color-accent); color: var(--color-cream-text); padding: 56px 0; }
.cta-banner-inner { text-align: center; }
.cta-banner h2 {
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.15;
}
.cta-banner p {
  font-size: 15px;
  opacity: .85;
  max-width: 42ch;
  margin: 18px auto 0;
}
.cta-banner .btn { margin-top: 26px; }

/* ---------- Footer ---------- */
.site-footer { padding: 32px 0; }
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}
.footer-copy { font-size: 12.5px; color: color-mix(in srgb, var(--color-ink) 60%, transparent); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 12.5px; color: color-mix(in srgb, var(--color-ink) 60%, transparent); }
.footer-links a:hover { color: var(--color-accent); }

/* ==========================================================================
   Tablet — 768px
   ========================================================================== */
@media (min-width: 768px) {
  .workflow-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .principles-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }
  .mentor-grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
}

/* ==========================================================================
   Desktop — 1200px (mockup reference width 1440px)
   ========================================================================== */
@media (min-width: 1200px) {
  .header-inner { padding-top: 22px; padding-bottom: 22px; }
  .main-nav {
    position: static;
    display: block;
    max-height: none;
    overflow: visible;
    background: none;
    border: 0;
  }
  .main-nav ul { flex-direction: row; padding: 0; gap: 20px; flex-wrap: nowrap; }
  .main-nav a { border: 0; padding: 0; }
  .header-cta { display: inline-flex; }
  .nav-toggle { display: none; }

  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    padding: 72px 0 96px;
  }
  .hero-media { order: 0; }
  .hero-social {
    position: absolute;
    right: var(--edge);
    top: 78px;
    flex-direction: column;
    gap: 18px;
  }
  .hero-social-label { writing-mode: vertical-rl; }

  .workflow-grid { grid-template-columns: repeat(4, 1fr); gap: 40px; }
  .principles-grid { grid-template-columns: repeat(4, 1fr); gap: 36px; }
  .why-grid { grid-template-columns: repeat(4, 1fr); gap: 36px; }
  .services-grid { grid-template-columns: repeat(4, 1fr); }
  .case-media { grid-template-columns: repeat(4, 1fr); }
}