/* ===========================
   ICAO Pilot Competencies
   Aviation Professional Site
   =========================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ---- Skip Link (Accessibility & SEO) ---- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  background: var(--blue-400);
  color: var(--white);
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

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

:root {
  --navy-900: #060E1E;
  --navy-800: #0A1628;
  --navy-700: #112040;
  --navy-600: #1A3260;
  --navy-500: #1E3A5F;
  --blue-400: #2D6FD4;
  --blue-300: #4A9EFF;
  --blue-200: #7EC8FF;
  --blue-100: #C8E8FF;
  --sky: #38BDF8;
  --gold: #F59E0B;
  --gold-light: #FCD34D;
  --white: #FFFFFF;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-400: #94A3B8;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-900: #0F172A;

  --font-main: 'Inter', sans-serif;
  --font-display: 'Space Grotesk', sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.1);
  --shadow-md: 0 4px 16px rgba(0,0,0,.18), 0 2px 6px rgba(0,0,0,.12);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.25), 0 4px 12px rgba(0,0,0,.15);
  --shadow-card: 0 2px 20px rgba(10,22,40,.12);
  --shadow-card-hover: 0 8px 40px rgba(10,22,40,.22), 0 2px 8px rgba(74,158,255,.15);

  --transition: all 0.25s cubic-bezier(.4,0,.2,1);
  --transition-slow: all 0.4s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--gray-50);
  color: var(--gray-700);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---- Navigation ---- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(6, 14, 30, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(74,158,255,.12);
  padding: 0 2rem;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar-logo {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--blue-400), var(--sky));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
}

.navbar-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: -0.01em;
}

.navbar-subtitle {
  font-size: 0.7rem;
  color: var(--blue-200);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.navbar-badge {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--blue-200);
  background: rgba(74,158,255,.12);
  border: 1px solid rgba(74,158,255,.25);
  padding: 4px 10px;
  border-radius: 20px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---- Hero ---- */
.hero {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(45,111,212,.25) 0%, transparent 60%),
    linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 40%, #0D1E38 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 2rem 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(74,158,255,.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(56,189,248,.05) 0%, transparent 50%);
  pointer-events: none;
}

/* Subtle grid pattern */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(74,158,255,.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(74,158,255,.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(74,158,255,.1);
  border: 1px solid rgba(74,158,255,.25);
  color: var(--blue-200);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 7px 18px;
  border-radius: 40px;
  margin-bottom: 28px;
  position: relative;
  z-index: 1;
}

.hero-tag::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--sky);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .5; transform: scale(.8); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  letter-spacing: -0.03em;
  max-width: 760px;
  position: relative;
  z-index: 1;
  margin-bottom: 20px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--blue-300), var(--sky));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--gray-400);
  max-width: 560px;
  line-height: 1.7;
  position: relative;
  z-index: 1;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  position: relative;
  z-index: 1;
}

.hero-stat {
  text-align: center;
}

.hero-stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1;
}

.hero-stat-label {
  font-size: 0.75rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.hero-stat-divider {
  width: 1px;
  background: rgba(255,255,255,.1);
  align-self: stretch;
}

/* ---- Section ---- */
.section {
  padding: 80px 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-400);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--navy-800);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1rem;
  color: var(--gray-600);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- Competency Cards Grid ---- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.comp-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.comp-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-400), var(--sky));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.comp-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(74,158,255,.3);
  transform: translateY(-4px);
}

.comp-card:hover::before {
  transform: scaleX(1);
}

.card-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-number {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  text-transform: uppercase;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy-800);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--gray-600);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-arrow {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--blue-400);
  transition: gap 0.2s ease;
}

.comp-card:hover .card-arrow { gap: 10px; }

/* ---- Detail Page ---- */
.detail-hero {
  background:
    radial-gradient(ellipse 70% 60% at 50% 0%, rgba(45,111,212,.2) 0%, transparent 70%),
    linear-gradient(180deg, var(--navy-900) 0%, var(--navy-700) 100%);
  padding: 120px 2rem 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.detail-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(74,158,255,.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(74,158,255,.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--blue-200);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
  transition: var(--transition);
}

.detail-back:hover { color: var(--white); gap: 12px; }

.detail-icon-wrap {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}

.detail-tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-200);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.detail-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.025em;
  position: relative;
  z-index: 1;
  margin-bottom: 16px;
}

.detail-definition {
  font-size: 1.05rem;
  color: rgba(255,255,255,.65);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* ---- Detail Content ---- */
.detail-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 64px 2rem;
}

.detail-section {
  margin-bottom: 56px;
}

.detail-section-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--navy-800);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.detail-section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-200);
}

.detail-section-subtitle {
  font-size: 0.85rem;
  color: var(--gray-400);
  margin-bottom: 24px;
}

/* Observable Behaviors */
.behaviors-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.behavior-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 20px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.behavior-item:hover {
  border-color: rgba(74,158,255,.3);
  box-shadow: var(--shadow-sm);
}

.behavior-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue-400), var(--sky));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: white;
  font-size: 13px;
  margin-top: 1px;
}

.behavior-text {
  font-size: 0.92rem;
  color: var(--gray-700);
  line-height: 1.55;
}

/* Practical Examples */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.example-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
}

.example-card:hover {
  border-color: rgba(74,158,255,.3);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.example-phase {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue-400);
  margin-bottom: 8px;
}

.example-title {
  font-weight: 600;
  color: var(--navy-800);
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.example-text {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.55;
}

/* Tips */
.tips-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tip-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 18px;
  background: linear-gradient(135deg, rgba(245,158,11,.05), rgba(252,211,77,.05));
  border: 1px solid rgba(245,158,11,.15);
  border-radius: var(--radius-sm);
}

.tip-bullet {
  color: var(--gold);
  font-size: 1rem;
  margin-top: 1px;
  flex-shrink: 0;
}

.tip-text {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.55;
}

/* App Promotion */
.apps-section {
  background: linear-gradient(135deg, var(--navy-800), var(--navy-600));
  border-radius: var(--radius-xl);
  padding: 44px;
  position: relative;
  overflow: hidden;
}

.apps-section::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 250px; height: 250px;
  background: radial-gradient(circle, rgba(74,158,255,.12), transparent 70%);
  pointer-events: none;
}

.apps-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-200);
  margin-bottom: 12px;
}

.apps-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.apps-desc {
  font-size: 0.92rem;
  color: rgba(255,255,255,.55);
  line-height: 1.6;
  margin-bottom: 28px;
  max-width: 520px;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.app-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
}

.app-card:hover {
  background: rgba(74,158,255,.12);
  border-color: rgba(74,158,255,.3);
  transform: translateY(-2px);
}

.app-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.app-name {
  font-weight: 600;
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.app-tagline {
  font-size: 0.78rem;
  color: rgba(255,255,255,.5);
  line-height: 1.45;
}

.app-badge {
  display: inline-block;
  margin-top: 10px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue-200);
  background: rgba(74,158,255,.15);
  padding: 3px 10px;
  border-radius: 20px;
}

/* ---- Footer ---- */
.footer {
  background: var(--navy-900);
  border-top: 1px solid rgba(255,255,255,.06);
  padding: 40px 2rem;
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--blue-400), var(--sky));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 15px;
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--white);
  font-size: 0.95rem;
}

.footer-text {
  font-size: 0.8rem;
  color: rgba(255,255,255,.3);
  line-height: 1.6;
}

.footer-text a {
  color: var(--blue-200);
  text-decoration: none;
}

/* ---- Color themes per competency ---- */
.theme-1 .card-icon-wrap { background: linear-gradient(135deg, #1E3A8A22, #3B82F611); }
.theme-1 .card-icon-wrap svg { color: #3B82F6; }
.theme-2 .card-icon-wrap { background: linear-gradient(135deg, #06402222, #10B98111); }
.theme-2 .card-icon-wrap svg { color: #10B981; }
.theme-3 .card-icon-wrap { background: linear-gradient(135deg, #7C213622, #F4365611); }
.theme-3 .card-icon-wrap svg { color: #F43656; }
.theme-4 .card-icon-wrap { background: linear-gradient(135deg, #4C1D9522, #8B5CF611); }
.theme-4 .card-icon-wrap svg { color: #8B5CF6; }
.theme-5 .card-icon-wrap { background: linear-gradient(135deg, #0C325822, #0EA5E911); }
.theme-5 .card-icon-wrap svg { color: #0EA5E9; }
.theme-6 .card-icon-wrap { background: linear-gradient(135deg, #7C2D1222, #F97B1111); }
.theme-6 .card-icon-wrap svg { color: #F97316; }
.theme-7 .card-icon-wrap { background: linear-gradient(135deg, #13334322, #06B6D411); }
.theme-7 .card-icon-wrap svg { color: #06B6D4; }
.theme-8 .card-icon-wrap { background: linear-gradient(135deg, #16352222, #22C55E11); }
.theme-8 .card-icon-wrap svg { color: #22C55E; }
.theme-9 .card-icon-wrap { background: linear-gradient(135deg, #78190822, #EF444411); }
.theme-9 .card-icon-wrap svg { color: #EF4444; }

/* Detail hero theme colors */
.detail-icon-wrap.theme-1 { background: linear-gradient(135deg, #1E3A8A, #3B82F6); }
.detail-icon-wrap.theme-2 { background: linear-gradient(135deg, #064E3B, #10B981); }
.detail-icon-wrap.theme-3 { background: linear-gradient(135deg, #881337, #F43656); }
.detail-icon-wrap.theme-4 { background: linear-gradient(135deg, #4C1D95, #8B5CF6); }
.detail-icon-wrap.theme-5 { background: linear-gradient(135deg, #0C4A6E, #0EA5E9); }
.detail-icon-wrap.theme-6 { background: linear-gradient(135deg, #7C2D12, #F97316); }
.detail-icon-wrap.theme-7 { background: linear-gradient(135deg, #164E63, #06B6D4); }
.detail-icon-wrap.theme-8 { background: linear-gradient(135deg, #14532D, #22C55E); }
.detail-icon-wrap.theme-9 { background: linear-gradient(135deg, #7F1D1D, #EF4444); }

/* ---- Utilities ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

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

.fade-in { animation: fadeInUp 0.5s ease forwards; }
.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; animation-fill-mode: forwards; animation-name: fadeInUp; animation-duration: 0.5s; }
.fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; animation-fill-mode: forwards; animation-name: fadeInUp; animation-duration: 0.5s; }
.fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; animation-fill-mode: forwards; animation-name: fadeInUp; animation-duration: 0.5s; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero-stats { gap: 24px; }
  .cards-grid { grid-template-columns: 1fr; }
  .apps-section { padding: 28px 20px; }
  .detail-content { padding: 40px 1rem; }
  .examples-grid { grid-template-columns: 1fr; }
  .apps-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .navbar { padding: 0 1rem; }
  .hero { padding: 100px 1rem 60px; }
  .section { padding: 60px 1rem; }
  .comp-card { padding: 20px; }
}