/* ============================================================
   AIRTK — styles.css
   AI Operations Consultancy · airtk.ai
   ============================================================ */


/* ── 1. RESET & BOX MODEL ─────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── 2. DESIGN TOKENS ─────────────────────────────────────── */
:root {
  /* Colour */
  --black:      #000000;
  --ink:        #0A0A0A;
  --ink-2:      #111111;
  --ink-3:      #1A1A1A;
  --paper:      #F0EDE7;
  --paper-2:    #D8D4CC;
  --paper-3:    #A09C96;
  --dim:        #6A6660;
  --dim-2:      #8A8680;
  --gold:       #C49A4A;
  --gold-hover: #D4AA5A;
  --rule:       rgba(255, 255, 255, 0.07);
  --rule-2:     rgba(255, 255, 255, 0.12);

  /* Type */
  --serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --sans:  'Outfit', system-ui, -apple-system, sans-serif;

  /* Layout */
  --max:    1240px;
  --gutter: clamp(24px, 5vw, 72px);
  --section-pad: clamp(96px, 10vw, 152px);
}

/* ── 3. BASE ──────────────────────────────────────────────── */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--black);
  color: var(--paper);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

/* ── 4. LAYOUT HELPERS ────────────────────────────────────── */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section {
  border-bottom: 1px solid var(--rule);
}

section:last-of-type {
  border-bottom: none;
}

/* ── 5. REVEAL ANIMATIONS ─────────────────────────────────── */
/* All content visible by default — no scroll-triggered opacity */
.reveal {
  opacity: 1;
  transform: none;
}

.d1, .d2, .d3, .d4 { /* delay classes kept for future use */ }

/* ── 6. TYPOGRAPHY SYSTEM ─────────────────────────────────── */
.eyebrow {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}

.eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--gold);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(36px, 4.5vw, 60px);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin-bottom: 20px;
}

.section-lead {
  font-size: 16px;
  font-weight: 300;
  color: var(--dim-2);
  line-height: 1.78;
  max-width: 560px;
}

/* ── 7. BUTTONS ───────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--black);
  background: var(--paper);
  padding: 16px 40px;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
  border: none;
  cursor: pointer;
}

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

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim-2);
  transition: color 0.2s;
  white-space: nowrap;
}

.btn-ghost .arrow {
  display: inline-block;
  transition: transform 0.25s;
}

.btn-ghost:hover {
  color: var(--paper);
}

.btn-ghost:hover .arrow {
  transform: translateX(5px);
}


/* ══════════════════════════════════════════════════════════════
   NAVIGATION
   ══════════════════════════════════════════════════════════════ */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--rule);
  transition: background 0.3s;
}

#nav.scrolled {
  background: rgba(0, 0, 0, 0.98);
}

.nav-logo {
  display: flex;
  align-items: center;
  height: 44px;
}

.nav-logo img {
  height: 34px;
  width: auto;
  transition: opacity 0.2s;
}

.nav-logo img:hover {
  opacity: 0.75;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-menu a {
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim-2);
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: var(--paper);
}

.nav-menu .nav-cta {
  color: var(--black);
  background: var(--paper);
  padding: 9px 24px;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
  letter-spacing: 0.1em;
}

.nav-menu .nav-cta:hover {
  background: var(--gold);
  color: #fff;
}

/* Hamburger toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--paper);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }


/* ══════════════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════════════ */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: 140px;
  padding-bottom: 112px;
  position: relative;
  overflow: hidden;
}

/* Faint right-edge logo watermark */
.hero-mark {
  position: absolute;
  right: var(--gutter);
  top: 50%;
  transform: translateY(-50%);
  width: min(480px, 42vw);
  opacity: 0.06;
  filter: invert(0);
  pointer-events: none;
  user-select: none;
}

.hero-brand {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.hero-brand::before {
  content: '';
  display: block;
  width: 28px;
  height: 1px;
  background: var(--gold);
  flex-shrink: 0;
}

/* Main headline — immediate read */
.hero-h1 {
  font-family: var(--serif);
  font-size: clamp(48px, 7.5vw, 96px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.025em;
  color: var(--paper);
  max-width: 760px;
  margin-bottom: 28px;
}

/* Subheadline — what AIRTK builds and for whom */
.hero-sub {
  font-family: var(--sans);
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 300;
  color: var(--paper-2);
  max-width: 580px;
  line-height: 1.65;
  margin-bottom: 20px;
  letter-spacing: 0.01em;
}

/* Supporting tagline — visibly smaller, italic, muted */
.hero-tagline {
  font-family: var(--serif);
  font-size: clamp(14px, 1.2vw, 16px);
  font-style: italic;
  font-weight: 400;
  color: var(--dim);
  max-width: 480px;
  line-height: 1.6;
  margin-bottom: 52px;
  padding-left: 16px;
  border-left: 1px solid rgba(196, 154, 74, 0.35);
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

/* Scroll line */
.scroll-line {
  position: absolute;
  bottom: 36px;
  left: var(--gutter);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
}

.scroll-line::after {
  content: '';
  display: block;
  width: 36px;
  height: 1px;
  background: var(--dim);
}


/* ══════════════════════════════════════════════════════════════
   METRICS STRIP
   ══════════════════════════════════════════════════════════════ */
#metrics {
  background: var(--ink-2);
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.metric-cell {
  padding: 48px 36px;
  border-right: 1px solid var(--rule);
  transition: background 0.25s;
}

.metric-cell:last-child {
  border-right: none;
}

.metric-cell:hover {
  background: var(--ink-3);
}

.metric-value {
  font-family: var(--serif);
  font-size: clamp(40px, 4.5vw, 58px);
  font-weight: 700;
  color: var(--paper);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: -0.025em;
}

.metric-value b {
  color: var(--gold);
}

.metric-label {
  font-size: 12.5px;
  font-weight: 400;
  color: var(--dim-2);
  line-height: 1.55;
}


/* ══════════════════════════════════════════════════════════════
   PROBLEM
   ══════════════════════════════════════════════════════════════ */
#problem {
  padding: var(--section-pad) 0;
}

.problem-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: end;
  margin-bottom: 72px;
}

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule);
}

.prob-card {
  padding: 44px 40px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  transition: background 0.3s;
}

.prob-card:nth-child(2n) { border-right: none; }
.prob-card:nth-child(3),
.prob-card:nth-child(4)  { border-bottom: none; }

.prob-card:hover {
  background: var(--ink-2);
}

.prob-num {
  font-family: var(--serif);
  font-size: 48px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.04);
  line-height: 1;
  margin-bottom: 20px;
  transition: color 0.3s;
  user-select: none;
}

.prob-card:hover .prob-num {
  color: var(--gold);
}

.prob-card h3 {
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
  margin-bottom: 10px;
  line-height: 1.35;
}

.prob-card p {
  font-size: 13.5px;
  color: var(--dim-2);
  line-height: 1.72;
}

.prob-callout {
  margin-top: 52px;
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 36px 44px;
  border-left: 2px solid var(--gold);
  background: var(--ink-2);
}

.prob-callout-q {
  font-family: var(--serif);
  font-size: 64px;
  font-weight: 700;
  color: var(--gold);
  line-height: 0.7;
  opacity: 0.3;
  flex-shrink: 0;
  user-select: none;
}

.prob-callout p {
  font-family: var(--serif);
  font-size: 19px;
  font-style: italic;
  color: var(--paper);
  line-height: 1.6;
}


/* ══════════════════════════════════════════════════════════════
   PROCESS
   ══════════════════════════════════════════════════════════════ */
#process {
  padding: var(--section-pad) 0;
}

.process-header {
  margin-bottom: 64px;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--rule);
}

.proc-card {
  padding: 52px 44px;
  border-right: 1px solid var(--rule);
  position: relative;
  transition: background 0.3s;
}

.proc-card:last-child {
  border-right: none;
}

.proc-card:hover {
  background: var(--ink-2);
}

/* Connector mark at card boundary */
.proc-card::after {
  content: '';
  position: absolute;
  top: 68px;
  right: -1px;
  width: 1px;
  height: 32px;
  background: var(--gold);
  opacity: 0.4;
}

.proc-card:last-child::after {
  display: none;
}

.proc-num {
  width: 44px;
  height: 44px;
  border: 1px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 36px;
  transition: background 0.25s, color 0.25s;
}

.proc-card:hover .proc-num {
  background: var(--gold);
  color: var(--black);
}

.proc-phase {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
}

.proc-name {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--paper);
  margin-bottom: 16px;
  line-height: 1.15;
}

.proc-desc {
  font-size: 13.5px;
  color: var(--dim-2);
  line-height: 1.75;
  margin-bottom: 32px;
}

.proc-price {
  font-size: 13px;
  font-weight: 500;
  color: var(--paper-2);
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}


/* ══════════════════════════════════════════════════════════════
   SERVICES
   ══════════════════════════════════════════════════════════════ */
#services {
  padding: var(--section-pad) 0;
}

.services-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  margin-bottom: 64px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.svc-card {
  background: var(--black);
  padding: 52px 44px;
  display: flex;
  flex-direction: column;
  transition: background 0.3s;
}

.svc-card:hover {
  background: var(--ink-2);
}

.svc-num {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-bottom: 28px;
}

.svc-name {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.1;
  margin-bottom: 8px;
}

.svc-tagline {
  font-family: var(--serif);
  font-size: 13px;
  font-style: italic;
  color: var(--dim-2);
  margin-bottom: 28px;
}

.svc-bar {
  width: 28px;
  height: 2px;
  background: var(--gold);
  margin-bottom: 28px;
  transition: width 0.35s;
}

.svc-card:hover .svc-bar {
  width: 56px;
}

.svc-desc {
  font-size: 13.5px;
  color: var(--dim-2);
  line-height: 1.78;
  flex: 1;
  margin-bottom: 32px;
}

.svc-list {
  list-style: none;
  border-top: 1px solid var(--rule);
  padding-top: 24px;
  margin-bottom: 32px;
}

.svc-list li {
  font-size: 12.5px;
  color: var(--dim-2);
  line-height: 1.9;
  padding-left: 16px;
  position: relative;
}

.svc-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 10px;
}

.svc-price {
  font-size: 15px;
  font-weight: 500;
  color: var(--paper);
  border-top: 1px solid var(--rule);
  padding-top: 24px;
}

.svc-price small {
  display: block;
  font-size: 11.5px;
  font-weight: 300;
  color: var(--dim-2);
  margin-top: 4px;
}


/* ══════════════════════════════════════════════════════════════
   CLIENT WORK
   ══════════════════════════════════════════════════════════════ */
#work {
  padding: var(--section-pad) 0;
}

.work-header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: end;
  margin-bottom: 64px;
}

.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim-2);
  white-space: nowrap;
  align-self: flex-end;
  padding-bottom: 4px;
}

.live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ABA80;
  animation: livePulse 2.4s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes livePulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 1;   }
}

.work-list {
  display: flex;
  flex-direction: column;
}

.work-row {
  display: grid;
  grid-template-columns: 260px 1fr;
  border: 1px solid var(--rule);
  border-bottom: none;
  transition: background 0.25s;
}

.work-row:last-child {
  border-bottom: 1px solid var(--rule);
}

.work-row:hover {
  background: var(--ink-2);
}

.work-meta {
  padding: 44px 36px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.work-client {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.2;
  margin-bottom: 6px;
}

.work-ind {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
}

.work-kpi {
  font-size: 13px;
  font-weight: 500;
  color: var(--gold);
  line-height: 1.65;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

.work-body {
  padding: 44px 56px;
  display: flex;
  align-items: center;
}

.work-body p {
  font-family: var(--serif);
  font-size: 16px;
  font-style: italic;
  color: var(--dim-2);
  line-height: 1.82;
}


/* ══════════════════════════════════════════════════════════════
   ABOUT
   ══════════════════════════════════════════════════════════════ */
#about {
  padding: var(--section-pad) 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 96px;
  margin-top: 60px;
}

.about-name {
  font-family: var(--serif);
  font-size: clamp(30px, 3.2vw, 44px);
  font-weight: 700;
  color: var(--paper);
  line-height: 1.08;
  margin-bottom: 10px;
}

.about-role {
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.about-role::before {
  content: '';
  display: block;
  width: 16px;
  height: 1px;
  background: var(--gold);
}

.about-bio {
  font-size: 15.5px;
  font-weight: 300;
  color: var(--dim-2);
  line-height: 1.88;
}

.about-bio strong {
  color: var(--paper);
  font-weight: 500;
}

.about-bio p + p {
  margin-top: 20px;
}

.cred-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cred-badge {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 22px 24px;
  border: 1px solid var(--rule);
  background: var(--ink-2);
  transition: border-color 0.25s, background 0.25s;
  cursor: default;
}

.cred-badge:hover {
  border-color: var(--gold);
  background: var(--ink-3);
}

.cred-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: 1px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  transition: background 0.25s, color 0.25s;
}

.cred-badge:hover .cred-icon {
  background: var(--gold);
  color: var(--black);
}

.cred-text strong {
  display: block;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--paper);
  margin-bottom: 3px;
  line-height: 1.3;
}

.cred-text span {
  font-size: 11.5px;
  color: var(--dim-2);
}


/* ══════════════════════════════════════════════════════════════
   CTA
   ══════════════════════════════════════════════════════════════ */
#cta {
  padding: var(--section-pad) 0 clamp(100px, 12vw, 176px);
  border-bottom: none;
}

.cta-block {
  border-top: 1px solid var(--rule-2);
  padding-top: 88px;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 80px;
  align-items: end;
}

.cta-tag {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.cta-tag::before {
  content: '';
  display: block;
  width: 18px;
  height: 1px;
  background: var(--gold);
}

.cta-h2 {
  font-family: var(--serif);
  font-size: clamp(52px, 7.5vw, 96px);
  font-weight: 700;
  line-height: 0.93;
  letter-spacing: -0.03em;
  color: var(--paper);
  margin-bottom: 32px;
}

.cta-sub {
  font-size: 15.5px;
  font-weight: 300;
  color: var(--dim-2);
  max-width: 440px;
  line-height: 1.78;
  margin-bottom: 48px;
}

.cta-contact {
  align-self: flex-end;
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 4px;
}

.cta-detail {
  font-size: 12.5px;
  color: var(--dim-2);
}

.cta-detail a {
  color: var(--dim-2);
  transition: color 0.2s;
}

.cta-detail a:hover {
  color: var(--paper);
}

.cta-detail.email a {
  color: var(--paper-2);
  font-weight: 400;
}


/* ══════════════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════════════ */
footer {
  border-top: 1px solid var(--rule);
  padding: 40px var(--gutter);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 48px;
}

.footer-logo img {
  height: 28px;
  width: auto;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.footer-logo img:hover {
  opacity: 1;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  list-style: none;
}

.footer-nav a {
  font-size: 11.5px;
  color: var(--dim-2);
  letter-spacing: 0.06em;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--paper);
}

.footer-copy {
  font-size: 11px;
  color: var(--dim);
  text-align: right;
  letter-spacing: 0.04em;
}


/* ══════════════════════════════════════════════════════════════
   RESPONSIVE BREAKPOINTS
   ══════════════════════════════════════════════════════════════ */

/* Tablet — 1024px */
@media (max-width: 1024px) {
  .metrics-row {
    grid-template-columns: 1fr 1fr;
  }

  .metric-cell:nth-child(2) { border-right: none; }
  .metric-cell:nth-child(3) { border-right: 1px solid var(--rule); border-top: 1px solid var(--rule); }
  .metric-cell:nth-child(4) { border-top: 1px solid var(--rule); border-right: none; }

  .problem-header {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .proc-card {
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }

  .proc-card:last-child { border-bottom: none; }
  .proc-card::after    { display: none; }

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

  .services-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .cta-block {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .cta-contact {
    text-align: left;
  }

  footer {
    grid-template-columns: auto 1fr;
    row-gap: 20px;
  }

  .footer-copy {
    grid-column: 1 / -1;
    text-align: left;
  }

  .footer-nav {
    justify-content: flex-end;
  }
}

/* Mobile — 768px */
@media (max-width: 768px) {
  /* Nav */
  .nav-toggle { display: flex; }

  .nav-menu {
    display: none;
    position: fixed;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(0, 0, 0, 0.98);
    border-bottom: 1px solid var(--rule);
    padding: 8px 0 24px;
  }

  .nav-menu.open { display: flex; }

  .nav-menu li { width: 100%; }

  .nav-menu a {
    display: block;
    padding: 14px var(--gutter);
    font-size: 13px;
  }

  .nav-menu .nav-cta {
    margin: 12px var(--gutter) 0;
    display: inline-block;
    padding: 12px 28px;
  }

  /* Hero */
  .hero-mark { display: none; }

  /* Problem grid */
  .problem-grid {
    grid-template-columns: 1fr;
  }

  .prob-card:nth-child(2n) { border-right: 1px solid var(--rule); }
  .prob-card:nth-child(3)  { border-bottom: 1px solid var(--rule); }
  .prob-card:nth-child(4)  { border-bottom: none; }

  /* Work */
  .work-header {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .work-meta {
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }

  .work-body {
    padding: 36px 28px;
  }

  /* Footer */
  footer {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-nav {
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 20px;
  }

  .footer-copy { text-align: left; }
}

/* Small mobile — 480px */
@media (max-width: 480px) {
  .hero-h1 { font-size: clamp(38px, 12vw, 64px); }

  .hero-sub {
    font-size: 16px;
    margin-bottom: 16px;
  }

  .hero-tagline {
    font-size: 13px;
    margin-bottom: 40px;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

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

  .metric-cell { padding: 28px 18px; }

  .prob-card  { padding: 32px 24px; }
  .proc-card  { padding: 40px 28px; }
  .svc-card   { padding: 40px 28px; }
  .work-meta  { padding: 32px 24px; }
  .work-body  { padding: 28px 24px; }
  .prob-callout { padding: 28px 24px; }

  .cta-block { padding-top: 56px; }
}