/* ===== ATLAS Corporate Website - Shared Styles ===== */
/* Blueprint White x Action Orange - Rational & Compact */

/* --- CSS Custom Properties --- */
:root {
  --canvas-bg: #fbfbfc;
  --card-bg: #ffffff;
  --light-gray-bg: #f0f2f5;
  --text-primary: #1a1f2e;
  --text-secondary: #5f6368;
  --border-color: #e8eaed;
  --grid-dot: rgba(0,0,0,0.03);
  --action-orange: #ec652b;
  --action-orange-hover: #d95a24;
  --light-blue-tag: #e8f0fe;
  --light-green-tag: #e6f4ea;
  --status-green: #16ca2e;
  --footer-bg: #1a1f2e;
  --shadow-card: rgba(0,0,0,0.04) 0px 2px 8px;
  --shadow-card-hover: rgba(0,0,0,0.08) 0px 2px 12px;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', 'IBM Plex Mono', monospace;
  --max-width: 1200px;
  --radius-card: 8px;
  --radius-tag: 4px;
  --section-gap: 80px;
  --sub-gap: 48px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--canvas-bg);
  background-image: radial-gradient(circle, var(--grid-dot) 1px, transparent 1px);
  background-size: 12px 12px;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 200ms ease-out;
}

img {
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Typography --- */
.text-micro {
  font-size: 12px;
  line-height: 1.2;
  letter-spacing: 0.01em;
  font-weight: 400;
}

.text-body {
  font-size: 14px;
  line-height: 1.5;
  font-weight: 400;
}

.text-body-strong {
  font-size: 16px;
  line-height: 1.5;
  font-weight: 400;
}

.text-subtitle {
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  font-weight: 500;
}

.text-card-title {
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.text-section-title {
  font-size: 36px;
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--text-primary);
}

.text-hero-title {
  font-size: 48px;
  line-height: 1.15;
  letter-spacing: -0.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.text-data-large {
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1.0;
  letter-spacing: -0.04em;
  font-weight: 700;
  color: var(--text-primary);
}

.text-data-small {
  font-family: var(--font-mono);
  font-size: 32px;
  line-height: 1.0;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--text-primary);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--canvas-bg);
  border-bottom: 1px solid var(--border-color);
  transition: border-color 200ms ease-out;
}

.navbar.scrolled {
  border-bottom-color: #d0d4d8;
}

.navbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar-logo {
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 16px;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar-links a {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-card);
  transition: all 200ms ease-out;
  position: relative;
}

.navbar-links a:hover {
  color: var(--text-primary);
  background: rgba(26,31,46,0.04);
}

.navbar-links a.active {
  color: var(--text-primary);
  font-weight: 500;
}

.navbar-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--action-orange);
  border-radius: 1px;
}

.navbar-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.navbar-cta .btn-secondary-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--action-orange);
}

.navbar-cta .btn-secondary-link:hover {
  opacity: 0.8;
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--action-orange);
  color: #ffffff;
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-card);
  cursor: pointer;
  transition: all 200ms ease-out;
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--action-orange-hover);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: transparent;
  color: var(--action-orange);
  font-family: var(--font-primary);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--action-orange);
  border-radius: var(--radius-card);
  cursor: pointer;
  transition: all 200ms ease-out;
  text-decoration: none;
}

.btn-outline:hover {
  background: rgba(236,101,43,0.05);
}

/* --- Hamburger Menu (Mobile) --- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: none;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 200ms ease-out;
}

/* --- Page Header (for inner pages) --- */
.page-header {
  padding-top: 120px;
  padding-bottom: 48px;
  text-align: center;
}

.page-header .text-section-title {
  font-size: 40px;
  margin-bottom: 16px;
}

.page-header .text-body-strong {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Cards --- */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  transition: box-shadow 200ms ease-out;
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
}

/* --- Tags --- */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-tag);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.2;
}

.tag-problem {
  background: var(--light-gray-bg);
  color: var(--text-secondary);
}

.tag-solution {
  background: var(--light-blue-tag);
  color: var(--text-primary);
}

.tag-result {
  background: var(--light-green-tag);
  color: var(--action-orange);
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--card-bg);
  border: none;
  border-bottom: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  font-family: var(--font-primary);
  font-size: 14px;
  color: var(--text-primary);
  transition: border-color 200ms ease-out;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #9aa0a6;
  font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-bottom: 2px solid var(--action-orange);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* --- Footer --- */
.footer {
  background: var(--footer-bg);
  color: #ffffff;
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
  color: #ffffff;
}

.footer-links a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  padding: 4px 0;
  transition: color 200ms ease-out;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-contact-item {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 8px;
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
}

.footer-seo {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
}

/* --- Scroll Animation --- */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms ease-out, transform 500ms ease-out;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1199px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 767px) {
  :root {
    --section-gap: 48px;
    --sub-gap: 32px;
  }

  .text-hero-title {
    font-size: 32px;
  }

  .text-section-title {
    font-size: 28px;
  }

  .text-data-large {
    font-size: 28px;
  }

  .text-data-small {
    font-size: 24px;
  }

  .navbar-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--canvas-bg);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 16px 24px;
    gap: 0;
  }

  .navbar-links.open {
    display: flex;
  }

  .navbar-links a {
    padding: 12px 0;
    width: 100%;
  }

  .hamburger {
    display: flex;
  }

  .navbar-cta .btn-secondary-link {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .page-header {
    padding-top: 100px;
    padding-bottom: 32px;
  }

  .page-header .text-section-title {
    font-size: 28px;
  }
}