/* =============================================
   Fourth — Design System
   Inspired by Zapier, adapted with Dark Navy + Orange
   ============================================= */

/* --- CSS Variables --- */
:root {
  /* Primary Palette */
  --navy:         #0a1628;
  --navy-mid:     #12243d;
  --navy-light:   #1a3350;
  --cream:        #fffefb;
  --off-white:    #faf9f6;
  --orange:       rgb(220, 99, 48);
  --orange-dark:  rgba(220, 100, 48, 0.839);
  --orange-glow:  rgba(220, 99, 48, 0.12);

  /* Neutral Scale */
  --charcoal:     #2c2a25;
  --warm-gray:    #8a8579;
  --sand:         #c5c0b1;
  --light-sand:   #eceae3;
  --pale-sand:    #f5f4f0;

  /* Typography */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:    'DM Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;

  /* Spacing */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   32px;
  --space-2xl:  48px;
  --space-3xl:  64px;
  --space-4xl:  80px;
  --space-5xl:  120px;

  /* Border Radius */
  --radius-sm:  4px;
  --radius-md:  6px;
  --radius-lg:  10px;
  --radius-xl:  16px;
  --radius-pill: 100px;

  /* Container */
  --container-max: 1120px;
  --container-padding: 24px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--charcoal);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

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

/* --- Typography --- */
.label {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--orange);
}

.label-light {
  color: rgba(255, 255, 255, 0.5);
}

h1, .h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.5px;
  color: var(--navy);
}

h2, .h2 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.3px;
  color: var(--navy);
}

h3, .h3 {
  font-family: var(--font-body);
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--navy);
}

.body-lg {
  font-size: 19px;
  line-height: 1.7;
  color: var(--charcoal);
}

.body-md {
  font-size: 16px;
  line-height: 1.65;
  color: var(--warm-gray);
}

.text-cream { color: var(--cream); }
.text-navy  { color: var(--navy); }
.text-orange { color: var(--orange); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  padding: 16px 28px;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

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

.btn-dark {
  background: var(--navy);
  color: var(--cream);
  border-color: var(--navy);
}
.btn-dark:hover {
  background: var(--navy-mid);
  border-color: var(--navy-mid);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--sand);
}
.btn-outline:hover {
  border-color: var(--navy);
  background: var(--pale-sand);
}

.btn-outline-light {
  background: transparent;
  color: var(--cream);
  border-color: rgba(255, 255, 255, 0.25);
}
.btn-outline-light:hover {
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.05);
}

.btn-arrow::after {
  content: '→';
  transition: transform 0.2s ease;
}
.btn-arrow:hover::after {
  transform: translateX(3px);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 254, 251, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--light-sand);
  transition: all 0.3s ease;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-family: var(--font-body);
  font-size: 22px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.5px;
}
.nav-logo span {
  color: var(--orange);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--warm-gray);
  transition: color 0.2s ease;
  position: relative;
}
.nav-link:hover,
.nav-link.active {
  color: var(--navy);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--orange);
  border-radius: 1px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  font-size: 13px;
  font-weight: 600;
  color: var(--warm-gray);
  background: none;
  border: 1.5px solid var(--sand);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s ease;
}
.lang-toggle:hover {
  color: var(--navy);
  border-color: var(--navy);
}

/* Mobile Nav Toggle */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--navy);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* --- Sections --- */
.section {
  padding: var(--space-lg) 0;
}
.section-sm {
  padding: var(--space-md) 0;
}

.section > .container,
.section-sm > .container,
.section-pale > .container,
.section-navy > .container {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.section-navy {
  background: var(--navy);
  color: var(--cream);
  padding: var(--space-lg) 0;
}
.section-navy.hero-bg {
  position: relative;
  background: linear-gradient(165deg, var(--navy) 55%, var(--navy-mid) 100%);
  overflow: hidden;
}
.section-navy.hero-bg::before {
  content: '';
  position: absolute; top: 0; right: 0; bottom: 0; left: 0;
  background: url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?w=1400&q=75&auto=format&fit=crop') center/cover no-repeat;
  opacity: 0.12;
  mix-blend-mode: lighten;
}
.section-navy.hero-bg > .container { position: relative; z-index: 1; }
.section-navy h1,
.section-navy h2,
.section-navy h3,
.section-navy .h1,
.section-navy .h2,
.section-navy .h3 {
  color: var(--cream);
}
.section-navy .body-lg {
  color: rgba(255, 255, 255, 0.75);
}
.section-navy .body-md {
  color: rgba(255, 255, 255, 0.55);
}

.section-pale {
  background: var(--pale-sand);
  padding: var(--space-lg) 0;
}

/* --- Cards --- */
.card {
  background: var(--cream);
  border: 1px solid var(--sand);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all 0.3s ease;
}
.card:hover {
  border-color: var(--navy);
  transform: translateY(-3px);
}

.card-dark {
  background: var(--navy-mid);
  border-color: rgba(255, 255, 255, 0.08);
}
.card-dark:hover {
  border-color: var(--orange);
}

/* --- Service Selector Cards (Home Page) --- */
.service-card {
  position: relative;
  overflow: hidden;
  padding: var(--space-2xl) var(--space-2xl) var(--space-xl);
  border-radius: var(--radius-xl);
  border: 1.5px solid var(--sand);
  background: var(--cream);
  transition: all 0.4s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.service-card:hover::before {
  transform: scaleX(1);
}
.service-card:hover {
  border-color: var(--orange);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(10, 22, 40, 0.08);
}

.service-card .label {
  margin-bottom: var(--space-xs);
}

.service-card .keyword {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 500;
  line-height: 1.15;
  color: var(--navy);
}

.service-card .desc {
  font-size: 15px;
  line-height: 1.65;
  color: var(--warm-gray);
  flex-grow: 1;
}

/* --- Stats --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  text-align: center;
}
.stat-item {
  padding: var(--space-xl) var(--space-md);
}
.stat-value {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 56px);
  font-weight: 500;
  color: var(--orange);
  line-height: 1;
  margin-bottom: var(--space-sm);
}
.stat-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--warm-gray);
}

/* --- Value Cards --- */
.value-card {
  padding: var(--space-xl);
  border: 1px solid var(--light-sand);
  border-radius: var(--radius-lg);
  background: var(--cream);
  transition: all 0.3s ease;
}
.value-card:hover {
  border-color: var(--sand);
  background: var(--off-white);
}
.value-card .number {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--orange);
  margin-bottom: var(--space-md);
}
.value-card h3 {
  font-size: 18px;
  margin-bottom: var(--space-sm);
}
.value-card p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--warm-gray);
}

/* --- Footer --- */
.footer {
  background: var(--navy);
  color: var(--cream);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .nav-logo {
  color: var(--cream);
  font-size: 24px;
  margin-bottom: var(--space-md);
}

.footer-tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: var(--space-lg);
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
  margin-bottom: var(--space-lg);
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  padding: 6px 0;
  transition: color 0.2s ease;
}
.footer-col a:hover {
  color: var(--cream);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.3);
}

/* --- Divider --- */
.divider {
  width: 48px;
  height: 2px;
  background: var(--orange);
  border-radius: 1px;
  margin: var(--space-lg) 0;
}

/* --- Grid Layouts --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

/* --- Animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.anim-up {
  opacity: 0;
  transform: translateY(24px);
}
.anim-up.visible {
  animation: fadeUp 0.7s ease forwards;
}

.anim-delay-1 { animation-delay: 0.1s !important; }
.anim-delay-2 { animation-delay: 0.2s !important; }
.anim-delay-3 { animation-delay: 0.3s !important; }
.anim-delay-4 { animation-delay: 0.4s !important; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
  .section { padding: var(--space-md) 0; }
  .section-pale { padding: var(--space-md) 0; }
  .section-navy { padding: var(--space-md) 0; }
  .section > .container,
  .section-sm > .container,
  .section-pale > .container,
  .section-navy > .container { padding-top: var(--space-md); padding-bottom: var(--space-md); }
}

@media (max-width: 640px) {
  :root {
    --container-padding: 20px;
  }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--cream);
    border-bottom: 1px solid var(--light-sand);
    padding: var(--space-lg) var(--container-padding);
    gap: var(--space-md);
  }
  .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; gap: 0; }
  .stat-item { padding: var(--space-md); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
  .btn { padding: 14px 24px; font-size: 14px; }
}