/* ============================================================
   SPACE FROM EARTH — Global Styles
   Design system: Poppins, dark space palette, accent #00d9ff
   ============================================================ */

/* ── Imports ── */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');

/* ── Custom Properties ── */
:root {
  /* Colors */
  --bg:             #0a0e27;
  --bg-secondary:   #1a1f3a;
  --bg-card:        rgba(26, 31, 58, 0.75);
  --accent:         #00d9ff;
  --accent-dim:     rgba(0, 217, 255, 0.15);
  --accent-border:  rgba(0, 217, 255, 0.22);
  --accent-glow:    rgba(0, 217, 255, 0.08);
  --accent-sec:     #9d4edd;
  --accent-sec-dim: rgba(157, 78, 221, 0.12);
  --text:           #ffffff;
  --text-secondary: #b0b0b0;
  --text-dim:       #6b7280;
  --border:         #2d3561;
  --border-subtle:  rgba(45, 53, 97, 0.6);

  /* Typography */
  --font:           'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:      'SF Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs:  0.375rem;
  --space-sm:  0.75rem;
  --space-md:  1.25rem;
  --space-lg:  2rem;
  --space-xl:  3.5rem;
  --space-2xl: 5.5rem;

  /* Sizing */
  --container: 1200px;
  --nav-height: 200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.3s var(--ease-out);
  --transition-slow: 0.6s var(--ease-out);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: var(--font); }

/* ── Layout ── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-2xl) 0;
}

.section--sm {
  padding: var(--space-xl) 0;
}

/* ── Typography ── */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); font-weight: 600; letter-spacing: -0.01em; }
h4 { font-size: 1.1rem; font-weight: 600; }

p { color: var(--text-secondary); max-width: 65ch; line-height: 1.75; }

.label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-dim); }

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10, 14, 39, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--border-subtle);
}

.nav-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  min-width: 200px;
  height: auto;
  max-height: 165px;
  object-fit: contain;
  object-position: left center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 2px;
  transition: color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px) scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.25);
}

.btn-primary:hover {
  background: #1fe4ff;
  transform: translateY(-2px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.25), 0 8px 24px rgba(0,217,255,0.2);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-border);
  box-shadow: inset 0 1px 0 rgba(0,217,255,0.06);
}

.btn-outline:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  color: var(--text);
  background: rgba(255,255,255,0.05);
  border-color: var(--border);
  transform: translateY(-2px);
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-border);
  box-shadow: 0 16px 48px rgba(0,0,0,0.3), inset 0 1px 0 rgba(0,217,255,0.08);
}

/* ── Section Headers ── */
.section-header {
  margin-bottom: var(--space-xl);
}

.section-header .label {
  display: block;
  margin-bottom: var(--space-sm);
}

.section-header p {
  margin-top: var(--space-sm);
  font-size: 1.05rem;
}

/* ── Star Background ── */
.stars-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

/* ── Page Header (for inner pages) ── */
.page-header {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-subtle);
}

.page-header .container {
  max-width: 860px;
}

.page-header h1 {
  margin-top: var(--space-sm);
  margin-bottom: var(--space-md);
}

.page-header p {
  font-size: 1.1rem;
  max-width: 55ch;
}

/* ── Breadcrumb / Back Link ── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition), gap var(--transition);
}

.back-link:hover {
  color: var(--accent);
  gap: 0.75rem;
}

.back-link svg {
  transition: transform var(--transition);
}

.back-link:hover svg {
  transform: translateX(-3px);
}

/* ── Article Image ── */
.article-hero-img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

/* ── Article Content ── */
.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
  max-width: 70ch;
}

.article-content p {
  margin-bottom: 1.5rem;
  max-width: none;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

.article-content p:last-child { margin-bottom: 0; }

.article-content strong {
  color: var(--text);
  font-weight: 600;
}

/* ── Share Section ── */
.share-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.share-bar .label {
  color: var(--text-secondary);
  margin-right: var(--space-xs);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  background: transparent;
  transition: all var(--transition);
  cursor: pointer;
}

.share-btn:hover {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-dim);
  transform: translateY(-1px);
}

/* ── Next/Prev Article ── */
.article-nav {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-xl) 0;
  flex-wrap: wrap;
}

.article-nav-item {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  max-width: 320px;
}

.article-nav-item .label {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.article-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--transition), gap var(--transition);
}

.article-nav-link:hover {
  color: var(--accent);
  gap: 0.75rem;
}

/* ── Contact Form ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: rgba(26, 31, 58, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9375rem;
  font-family: var(--font);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  outline: none;
  -webkit-appearance: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-dim);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent);
  background: rgba(26, 31, 58, 0.8);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 160px;
  line-height: 1.6;
}

.form-error {
  font-size: 0.8rem;
  color: #ff6b6b;
  display: none;
}

.form-group.has-error .form-input,
.form-group.has-error .form-textarea {
  border-color: #ff6b6b;
}

.form-group.has-error .form-error {
  display: block;
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-xl);
}

.form-success.visible { display: block; }

.form-success-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
}

/* ── Contact Info Cards ── */
.contact-info-card {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}

.contact-info-card:hover {
  border-color: var(--accent-border);
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent);
}

.contact-info-card h4 {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.contact-info-card p {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  max-width: none;
}

.contact-info-card a {
  color: var(--accent);
  transition: color var(--transition);
}

.contact-info-card a:hover { color: #1fe4ff; }

/* ── FAQ ── */
.faq-item {
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-md) 0;
}

.faq-question {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  font-size: 0.975rem;
}

.faq-answer {
  color: var(--text-secondary);
  font-size: 0.9rem;
  max-width: none;
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg);
}

.footer-main {
  padding: var(--space-xl) 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-xl);
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-lg);
}

.footer-brand p {
  margin-top: 0;
  font-size: 0.9rem;
  max-width: 40ch;
}

.footer-logo {
  width: auto;
  height: auto;
  max-height: 100px;
  flex-shrink: 0;
  object-fit: contain;
  object-position: left center;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: flex-end;
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.footer-bottom {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-dim);
  max-width: none;
}

/* ── Utility ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.mt-sm  { margin-top: var(--space-sm); }
.mt-md  { margin-top: var(--space-md); }
.mt-lg  { margin-top: var(--space-lg); }
.mt-xl  { margin-top: var(--space-xl); }
.mb-sm  { margin-bottom: var(--space-sm); }
.mb-md  { margin-bottom: var(--space-md); }
.mb-lg  { margin-bottom: var(--space-lg); }
.mb-xl  { margin-bottom: var(--space-xl); }

.flex       { display: flex; }
.flex-col   { flex-direction: column; }
.items-center { align-items: center; }
.gap-sm     { gap: var(--space-sm); }
.gap-md     { gap: var(--space-md); }
.gap-lg     { gap: var(--space-lg); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-lg);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity var(--transition), transform var(--transition);
    z-index: 99;
  }

  .nav-links.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-link {
    font-size: 1.25rem;
    color: var(--text);
  }

  .nav-toggle { display: flex; }

  :root { --nav-height: 175px; }

  .logo-img {
    min-width: 160px;
    max-height: 135px;
  }

  .footer-main {
    grid-template-columns: 1fr;
  }

  .footer-nav {
    align-items: flex-start;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .article-hero-img { height: 240px; }
}

@media (max-width: 375px) {
  .container { padding: 0 1rem; }
}