/* ============================================================
   IT-214 — Mobilidade Aérea Urbana
   Instituto Tecnológico de Aeronáutica
   Premium Modernized Design
   ============================================================ */

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

/* ── Variables ─────────────────────────────────────────────── */
:root {
  /* Colors */
  --color-primary:   #0f172a;       /* Slate 900 */
  --color-primary-light: #1e293b;   /* Slate 800 */
  --color-accent:    #3b82f6;       /* Vibrant Blue */
  --color-accent-hover: #2563eb;
  --color-accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --color-bg:        #f8fafc;       /* Slate 50 */
  --color-surface:   #ffffff;
  --color-text:      #334155;       /* Slate 700 */
  --color-text-heading: #0f172a;    /* Slate 900 */
  --color-muted:     #64748b;       /* Slate 500 */
  --color-border:    rgba(15, 23, 42, 0.08);
  --color-success:   #10b981;
  --color-soon:      #94a3b8;
  
  /* Shadows & Glassmorphism */
  --shadow-sm:       0 2px 8px -2px rgba(15, 23, 42, 0.05);
  --shadow-md:       0 12px 32px -8px rgba(15, 23, 42, 0.08);
  --shadow-lg:       0 24px 48px -12px rgba(15, 23, 42, 0.12);
  --shadow-glow:     0 0 24px rgba(59, 130, 246, 0.3);
  --glass-bg:        rgba(255, 255, 255, 0.75);
  --glass-border:    1px solid rgba(255, 255, 255, 0.5);
  --glass-nav:       rgba(15, 23, 42, 0.85);

  /* Geometry */
  --radius:          12px;
  --radius-lg:       20px;
  --radius-xl:       24px;
  --navbar-h:        72px;
  
  /* Typography */
  --font-body:       'Inter', sans-serif;
  --font-heading:    'Outfit', sans-serif;
  --font-mono:       'Fira Code', monospace;
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition:      0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-text-heading);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

a { 
  color: var(--color-accent); 
  text-decoration: none; 
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }

/* ── Navbar (Glassmorphism) ────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--navbar-h);
  background: var(--glass-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  padding: 0 5%;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  transition: all var(--transition);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}
.navbar__brand:hover { color: #fff; transform: scale(1.02); }

.navbar__logo {
  height: 44px;
  flex-shrink: 0;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.navbar__nav {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  margin-left: auto;
}

.navbar__nav a {
  color: rgba(255,255,255,0.7);
  padding: 0.6rem 1.2rem;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  font-family: var(--font-heading);
}
.navbar__nav a:hover,
.navbar__nav a.active {
  background: rgba(255,255,255,0.1);
  color: #fff;
  transform: translateY(-1px);
}

/* ── Page wrapper ───────────────────────────────────────────── */
.page-wrapper {
  padding-top: var(--navbar-h);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 7rem 2rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
  animation: rotateGlow 30s linear infinite;
  pointer-events: none;
}
@keyframes rotateGlow {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
  position: relative;
  background: linear-gradient(to right, #fff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: #94a3b8;
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
  position: relative;
  animation: fadeUp 1s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
}

@keyframes fadeUp {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ── Container ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Section ────────────────────────────────────────────────── */
.section {
  padding: 5rem 0;
  position: relative;
}
.section--alt {
  background: var(--color-surface);
  position: relative;
}
.section--alt::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
}

.section__title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 2rem;
  text-align: center;
  position: relative;
}
.section__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-accent-gradient);
  border-radius: 4px;
  margin: 1rem auto 0;
}
.section__title--spaced {
  margin-top: 4rem;
}

/* ── Intro text / Cards ─────────────────────────────────────── */
.intro-block {
  background: var(--glass-bg);
  border: var(--glass-border);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.intro-block::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--color-accent-gradient);
}
.intro-block:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.intro-block h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.intro-block p,
.intro-block ul,
.intro-block ol {
  font-size: 1.05rem;
  color: var(--color-text);
}
.intro-block ul, .intro-block ol {
  padding-left: 1.5rem;
  margin-top: 1rem;
}
.intro-block li { margin-bottom: 0.5rem; }
.intro-block strong { color: var(--color-primary); font-weight: 600; }

/* ── Team cards ─────────────────────────────────────────────── */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.team-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 2.5rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-bounce);
  position: relative;
  z-index: 1;
}
.team-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(59, 130, 246, 0.3);
}

.team-card__avatar {
  width: 90px; height: 90px;
  border-radius: 50%;
  background: var(--color-accent-gradient);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.5rem;
  padding: 3px;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-bounce);
}
.team-card:hover .team-card__avatar {
  transform: scale(1.05) rotate(5deg);
}

.team-card__avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--color-surface);
  transition: filter var(--transition);
}
.team-card__avatar-img {
  filter: grayscale(80%) contrast(1.1);
}
.team-card:hover .team-card__avatar-img {
  filter: grayscale(0%) contrast(1);
}

.team-card__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  display: inline-block;
}
.team-card__name:hover { color: var(--color-accent); }

.team-card__info {
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.4;
}

/* ── CTA Button ─────────────────────────────────────────────── */
.cta-wrapper {
  text-align: center;
  padding: 1rem 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  border-radius: 100px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all var(--transition-bounce);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}
.btn--primary {
  background: var(--color-accent-gradient);
  color: #fff;
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}
.btn--primary::after {
  content: ''; position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}
.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(59, 130, 246, 0.4);
  color: #fff;
}
.btn--primary:hover::after { left: 100%; }

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-border);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  background: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn--sm {
  padding: 0.7rem 1.5rem;
  font-size: 0.95rem;
}

/* ── Breadcrumb ─────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--color-muted);
  padding: 1.5rem 0;
  font-family: var(--font-heading);
  font-weight: 500;
}
.breadcrumb a { color: var(--color-text); }
.breadcrumb a:hover { color: var(--color-accent); text-decoration: none; }
.breadcrumb__sep { opacity: 0.4; }

/* ── Activities Grid ────────────────────────────────────────── */
.activities-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 6rem 2rem 4rem;
  text-align: center;
}
.activities-header__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #fff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.activities-header__sub {
  font-size: 1.1rem;
  color: #94a3b8;
}

.activities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  padding: 3rem 0;
}

.activity-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-bounce);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}
.activity-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
  background: var(--color-border);
  transition: background var(--transition);
}
.activity-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(59, 130, 246, 0.2);
}
.activity-card:hover::before {
  background: var(--color-accent-gradient);
}

.activity-card__number {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-bg);
  text-shadow: -1px -1px 0 var(--color-border), 1px -1px 0 var(--color-border), -1px 1px 0 var(--color-border), 1px 1px 0 var(--color-border);
  line-height: 1;
  transition: text-shadow var(--transition), color var(--transition);
}
.activity-card:hover .activity-card__number {
  color: transparent;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  text-shadow: none;
}

.activity-card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}
.activity-card__sub {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 1rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-heading);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-top: auto;
  align-self: flex-start;
}
.badge--available {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}
.badge--soon {
  background: rgba(148, 163, 184, 0.1);
  color: var(--color-soon);
}

/* ── Activity page ──────────────────────────────────────────── */
.activity-page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 6rem 2rem 4rem;
  text-align: center;
}
.activity-page-header__label {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}
.activity-page-header__title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  color: #fff;
}

.activity-nav {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem 0 4rem;
  flex-wrap: wrap;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
}

/* ── Markdown content ───────────────────────────────────────── */
.markdown-body {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: 4rem;
  box-shadow: var(--shadow-md);
  line-height: 1.8;
  font-size: 1.05rem;
  color: var(--color-text);
  margin-bottom: 2rem;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--color-primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 800;
}
.markdown-body h1 { 
  font-size: 2.2rem; 
  padding-bottom: 1rem; 
  border-bottom: 2px solid var(--color-border); 
}
.markdown-body h2 { font-size: 1.6rem; color: var(--color-primary-light); }
.markdown-body h3 { font-size: 1.3rem; }

.markdown-body p { margin-bottom: 1.25rem; }

.markdown-body img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin: 2rem auto;
  max-height: 600px;
  object-fit: cover;
}
.markdown-body em {
  font-style: italic;
}
.markdown-body p > br + em {
  display: block;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-top: 0.5rem;
  margin-bottom: 2rem;
}

.markdown-body blockquote {
  border-left: 4px solid var(--color-accent);
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.05), transparent);
  margin: 2rem 0;
  padding: 1.5rem 2rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-primary);
  font-style: italic;
  font-size: 1.1rem;
}
.markdown-body blockquote p { margin: 0; }

.markdown-body table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  font-size: 0.95rem;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--color-border);
}
.markdown-body th,
.markdown-body td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
}
.markdown-body th:last-child,
.markdown-body td:last-child {
  border-right: none;
}
.markdown-body tr:last-child td {
  border-bottom: none;
}
.markdown-body th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  text-align: left;
  font-family: var(--font-heading);
  letter-spacing: 0.02em;
}
.markdown-body tr:nth-child(even) td { background: rgba(248, 250, 252, 0.5); }

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}
.markdown-body li { 
  margin-bottom: 0.5rem; 
  padding-left: 0.5rem;
}
.markdown-body li::marker {
  color: var(--color-accent);
  font-weight: 700;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(15, 23, 42, 0.05);
  padding: 0.2em 0.4em;
  border-radius: 6px;
  color: #e11d48;
}
.markdown-body pre {
  background: var(--color-primary);
  color: #e2e8f0;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: 2rem 0;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}
.markdown-body pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 0.9rem;
}

.markdown-body hr {
  border: none;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
  margin: 3rem 0;
}

/* ── Loading ────────────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 5rem 2rem;
  color: var(--color-muted);
}
.spinner {
  width: 40px; height: 40px;
  border: 3px solid rgba(59, 130, 246, 0.1);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s cubic-bezier(0.6, 0.2, 0.4, 0.8) infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Footer ─────────────────────────────────────────────────── */
footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.5);
  text-align: center;
  padding: 3rem 1.5rem;
  font-size: 0.9rem;
  margin-top: auto;
}
footer strong { color: #fff; font-weight: 600; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .navbar { padding: 0 1rem; }
  .hero { padding: 5rem 1rem 3rem; }
  .markdown-body { padding: 2rem 1.5rem; }
  .activity-nav { flex-direction: column; }
  .activity-nav .btn { width: 100%; }
}