/* ============================================================
   Harbor Design Tokens — from brand guide v1.0
   ============================================================ */
:root {
  /* Backgrounds */
  --harbor-bg:          #101729;
  --harbor-surface:     #1A2640;
  --harbor-surface-2:   #243352;

  /* Text */
  --harbor-text:        #E5E4E2;
  --harbor-text-muted:  #9AA5B8;
  --harbor-heading:     #E5E4E2;

  /* Accent */
  --harbor-accent:      #F0C900;
  --harbor-accent-hover:#FC9B00;

  /* Border */
  --harbor-border:      rgba(229, 228, 226, 0.15);

  /* Brand secondary */
  --harbor-sky-light:   #79BDFC;
  --harbor-sky-deep:    #3D5FB9;
  --harbor-wave-dark:   #0F38A1;
  --harbor-wave-mid:    #1769D7;

  /* Typography */
  --font-sans: Inter, system-ui, -apple-system, Arial, Helvetica, sans-serif;

  /* Layout */
  --max-width: 1100px;
  --section-gap: 5rem;
  --radius: 10px;
  --radius-sm: 6px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--harbor-text);
  background-color: var(--harbor-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: var(--harbor-accent);
  text-decoration: none;
}

a:hover {
  color: var(--harbor-accent-hover);
}

/* ============================================================
   Layout
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: var(--section-gap) 0;
}

/* ============================================================
   Typography
   ============================================================ */
.display {
  font-size: clamp(2.25rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--harbor-heading);
  letter-spacing: -0.02em;
}

h1, .h1 {
  font-size: clamp(1.75rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--harbor-heading);
}

h2, .h2 {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--harbor-heading);
}

h3, .h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--harbor-heading);
}

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

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

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: none;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
  text-decoration: none;
}

/* Primary — Sun Gold fill */
.btn-primary {
  background-color: var(--harbor-accent);
  color: #101729;
}

.btn-primary:hover {
  background-color: var(--harbor-accent-hover);
  color: #101729;
}

/* Secondary — outlined */
.btn-secondary {
  background-color: transparent;
  color: var(--harbor-text);
  border: 1.5px solid var(--harbor-border);
}

.btn-secondary:hover {
  border-color: var(--harbor-text-muted);
  color: var(--harbor-heading);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1.0625rem;
}

/* ============================================================
   Header / Nav
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(16, 23, 41, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--harbor-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  height: 44px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--harbor-text-muted);
  transition: color 0.15s ease;
}

.site-nav a:hover {
  color: var(--harbor-text);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: 6rem 0 5rem;
  text-align: center;
}

.hero-logo {
  height: 120px;
  width: auto;
  margin: 0 auto 2rem;
}

.hero-tagline {
  margin-bottom: 1.25rem;
}

.hero-tagline .accent {
  color: var(--harbor-accent);
}

.hero-description {
  max-width: 580px;
  margin: 0 auto 2.5rem;
  font-size: 1.125rem;
  color: var(--harbor-text-muted);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   Features
   ============================================================ */
.features {
  background-color: var(--harbor-surface);
  border-top: 1px solid var(--harbor-border);
  border-bottom: 1px solid var(--harbor-border);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--harbor-surface-2);
  border: 1px solid var(--harbor-border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
}

.feature-icon {
  margin-bottom: 1rem;
  line-height: 1;
  color: var(--harbor-accent);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 1.5;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--harbor-text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ============================================================
   Download Section
   ============================================================ */
.downloads {
  text-align: center;
}

.downloads h2 {
  margin-bottom: 0.75rem;
}

.downloads .subtitle {
  color: var(--harbor-text-muted);
  margin-bottom: 2.5rem;
}

.download-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.download-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem 1.75rem;
  border-radius: var(--radius-sm);
  background-color: var(--harbor-surface);
  border: 1.5px solid var(--harbor-border);
  color: var(--harbor-text);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  min-width: 160px;
}

.download-btn:hover {
  border-color: var(--harbor-accent);
  color: var(--harbor-text);
  background-color: var(--harbor-surface-2);
}

.download-btn.highlighted {
  border-color: var(--harbor-accent);
}

.download-btn .platform-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.5;
}

.download-btn .platform-name {
  font-size: 1rem;
}

.download-btn .platform-note {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--harbor-text-muted);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--harbor-surface);
  border-top: 1px solid var(--harbor-border);
  padding: 2.5rem 0;
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--harbor-text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--harbor-text-muted);
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--harbor-text);
}

/* ============================================================
   Add Friend Page
   ============================================================ */
.add-friend-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
}

.add-friend-logo {
  height: 160px;
  width: auto;
  margin: 0 auto 2.5rem;
}

.add-friend-card {
  background-color: var(--harbor-surface);
  border: 1px solid var(--harbor-border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
}

.add-friend-card h1 {
  margin-bottom: 0.5rem;
  font-size: 1.375rem;
}

.contact-name {
  color: var(--harbor-accent);
}

.peer-id {
  font-size: 0.8125rem;
  color: var(--harbor-text-muted);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  word-break: break-all;
  margin: 0.75rem 0 1.75rem;
  padding: 0.5rem 0.75rem;
  background-color: var(--harbor-surface-2);
  border-radius: var(--radius-sm);
}

.add-friend-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.fallback-message {
  display: none;
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  background-color: rgba(240, 201, 0, 0.08);
  border: 1px solid rgba(240, 201, 0, 0.25);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--harbor-text-muted);
}

.fallback-message a {
  color: var(--harbor-accent);
}

.divider {
  border: none;
  border-top: 1px solid var(--harbor-border);
  margin: 1.5rem 0;
}

.no-harbor-section h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--harbor-text-muted);
  margin-bottom: 1rem;
}

.mini-downloads {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.mini-download-btn svg {
  width: 14px;
  height: 14px;
  stroke-width: 1.5;
  flex-shrink: 0;
}

.mini-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background-color: var(--harbor-surface-2);
  border: 1px solid var(--harbor-border);
  color: var(--harbor-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.mini-download-btn:hover {
  border-color: var(--harbor-text-muted);
  color: var(--harbor-text);
}

.mini-download-btn.highlighted {
  border-color: var(--harbor-accent);
  color: var(--harbor-text);
}

/* Invalid state */
.invalid-card {
  background-color: var(--harbor-surface);
  border: 1px solid var(--harbor-border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  max-width: 480px;
  width: 100%;
  margin: 0 auto;
}

.invalid-icon {
  margin-bottom: 1rem;
  color: var(--harbor-accent);
}

.invalid-icon svg {
  width: 48px;
  height: 48px;
  stroke-width: 1.5;
}

.invalid-card h1 {
  margin-bottom: 0.75rem;
  font-size: 1.375rem;
}

.invalid-card p {
  color: var(--harbor-text-muted);
  margin-bottom: 1.5rem;
}

/* ============================================================
   Utility
   ============================================================ */
.hidden {
  display: none !important;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  :root {
    --section-gap: 3.5rem;
  }

  .site-nav {
    display: none;
  }

  .hero {
    padding: 4rem 0 3.5rem;
  }

  .hero-logo {
    height: 88px;
  }

  .site-footer .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .add-friend-card,
  .invalid-card {
    padding: 2rem 1.25rem;
  }
}