/* ============================================================
   GULLDRONE — Design System
   Aesthetic: Industrial-precision meets aerial freedom
   Fonts: Bebas Neue (display) + DM Sans (body)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

/* ── TOKENS ─────────────────────────────────────────────── */
:root {
  --font-display: 'Bebas Neue', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  /* Light Mode (default) */
  --bg:          #F5F4F0;
  --bg-alt:      #ECEAE4;
  --bg-card:     #FFFFFF;
  --surface:     #E3E0D8;
  --border:      #D0CCC2;
  --text:        #1A1914;
  --text-muted:  #6B6860;
  --text-light:  #9B9890;

  --accent:      #E8530A;
  --accent-dark: #C44308;
  --accent-glow: rgba(232,83,10,0.18);

  --sky:         #1C4E7A;
  --sky-light:   #2E7EC4;

  --nav-bg:      rgba(245,244,240,0.92);
  --hero-overlay: rgba(245,244,240,0.55);

  --shadow-sm:  0 1px 4px rgba(26,25,20,0.08);
  --shadow-md:  0 4px 20px rgba(26,25,20,0.10);
  --shadow-lg:  0 12px 40px rgba(26,25,20,0.14);

  --radius:     6px;
  --radius-lg:  14px;
  --transition: 0.22s ease;
}

[data-theme="dark"] {
  --bg:          #0E0F10;
  --bg-alt:      #141518;
  --bg-card:     #1A1C1F;
  --surface:     #22252A;
  --border:      #2E3238;
  --text:        #F0EEE8;
  --text-muted:  #9098A4;
  --text-light:  #5A6270;

  --accent:      #FF6820;
  --accent-dark: #E8530A;
  --accent-glow: rgba(255,104,32,0.22);

  --sky:         #3A8FC8;
  --sky-light:   #5AB0E8;

  --nav-bg:      rgba(14,15,16,0.92);
  --hero-overlay: rgba(14,15,16,0.62);

  --shadow-sm:  0 1px 4px rgba(0,0,0,0.40);
  --shadow-md:  0 4px 20px rgba(0,0,0,0.50);
  --shadow-lg:  0 12px 40px rgba(0,0,0,0.60);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── TYPOGRAPHY ──────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: 0.02em;
  line-height: 1.05;
}

.display-xl { font-size: clamp(3.5rem, 8vw, 7.5rem); }
.display-lg { font-size: clamp(2.8rem, 5vw, 5rem); }
.display-md { font-size: clamp(2rem, 3.5vw, 3.2rem); }
.display-sm { font-size: clamp(1.6rem, 2.5vw, 2.2rem); }

p { font-size: 1rem; font-weight: 300; color: var(--text-muted); }
p.lead { font-size: 1.15rem; font-weight: 400; }

/* ── NAV ─────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 1.7rem;
  letter-spacing: 0.08em;
  color: var(--text);
  white-space: nowrap;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-logo .logo-icon svg {
  width: 22px;
  height: 22px;
  fill: white;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--surface);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Theme Toggle */
.theme-toggle {
  width: 42px; height: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  position: relative;
  transition: background var(--transition);
  flex-shrink: 0;
}

.theme-toggle::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  background: var(--text);
  border-radius: 50%;
  top: 2px; left: 2px;
  transition: transform var(--transition), background var(--transition);
}

[data-theme="dark"] .theme-toggle::before {
  transform: translateX(18px);
  background: var(--accent);
}

.theme-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-card);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  background: var(--surface);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-sky {
  background: var(--sky);
  color: white;
}
.btn-sky:hover {
  background: var(--sky-light);
  transform: translateY(-1px);
}

.btn-lg { padding: 0.9rem 2rem; font-size: 1rem; }
.btn-xl { padding: 1.1rem 2.4rem; font-size: 1.05rem; border-radius: 8px; }

/* ── LAYOUT ──────────────────────────────────────────────── */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 6rem 0;
}

.section-sm { padding: 4rem 0; }
.section-lg { padding: 8rem 0; }

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

/* ── HERO ─────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding-top: 68px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.5;
}

.hero-glow {
  position: absolute;
  width: 600px; height: 600px;
  top: 10%; right: -10%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  animation: pulse-glow 6s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 1; }
}

.hero-drone-visual {
  position: absolute;
  right: 6%;
  top: 50%;
  transform: translateY(-50%);
  width: clamp(300px, 38vw, 520px);
  opacity: 0.18;
  animation: drone-float 8s ease-in-out infinite;
}

[data-theme="dark"] .hero-drone-visual { opacity: 0.12; }

@keyframes drone-float {
  0%, 100% { transform: translateY(-50%) rotate(-1deg); }
  50% { transform: translateY(calc(-50% - 18px)) rotate(1deg); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  padding: 0.35rem 0.85rem;
  border-radius: 100px;
  margin-bottom: 1.5rem;
}

.hero-title {
  margin-bottom: 1.5rem;
  color: var(--text);
}

.hero-title span { color: var(--accent); }

.hero-desc {
  font-size: 1.15rem;
  font-weight: 300;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.hero-ctas .cta-note {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* Stats strip */
.stats-strip {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
  transition: background var(--transition);
}

.stats-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  justify-content: center;
}

.stat-item {
  flex: 1;
  min-width: 160px;
  text-align: center;
  padding: 1rem 2rem;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }

.stat-number {
  font-family: var(--font-display);
  font-size: 2.6rem;
  color: var(--text);
  display: block;
}

.stat-label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── HOW IT WORKS ────────────────────────────────────────── */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2px;
  background: var(--border);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.step-card {
  background: var(--bg-card);
  padding: 2.5rem 2rem;
  position: relative;
  transition: background var(--transition);
}

.step-number {
  font-family: var(--font-display);
  font-size: 4rem;
  color: var(--border);
  line-height: 1;
  margin-bottom: 1rem;
  transition: color var(--transition);
}

.step-card:hover .step-number { color: var(--accent); }

.step-icon {
  width: 44px; height: 44px;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

/* ── USE CASES ───────────────────────────────────────────── */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.usecase-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.usecase-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  height: 3px;
  width: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.usecase-card:hover::before { transform: scaleX(1); }
.usecase-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.usecase-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
  display: block;
}

.usecase-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

/* ── AUDIENCE CARDS ──────────────────────────────────────── */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.audience-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.audience-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.audience-header {
  padding: 2.5rem 2rem 1.5rem;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.audience-tag {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: white;
  background: var(--accent);
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 1rem;
}

.audience-body {
  padding: 1.5rem 2rem 2rem;
}

/* ── SECTIONS ────────────────────────────────────────────── */
.section-header {
  max-width: 640px;
  margin-bottom: 3.5rem;
}

.section-header.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.divider {
  width: 60px; height: 3px;
  background: var(--accent);
  margin: 1rem 0;
}

.divider.center { margin: 1rem auto; }

/* ── CTA BANNER ──────────────────────────────────────────── */
.cta-banner {
  background: var(--sky);
  color: white;
  padding: 5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(255,255,255,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(255,104,32,0.15) 0%, transparent 50%);
}

.cta-banner h2, .cta-banner p { color: white; }
.cta-banner p { opacity: 0.85; }

/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.9rem;
  margin-top: 0.75rem;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text);
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 0.25rem 0;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p { font-size: 0.82rem; }

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all var(--transition);
}

.social-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.social-link svg { width: 16px; height: 16px; fill: currentColor; }

/* ── FORMS ───────────────────────────────────────────────── */
.form-page {
  padding-top: 68px;
  min-height: 100vh;
}

.form-hero {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: 4rem 0 3rem;
}

.form-wrap {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 2rem;
}

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
  margin-top: 3rem;
  margin-bottom: 4rem;
}

.form-group {
  margin-bottom: 1.4rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

label .req { color: var(--accent); }

input, select, textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea { resize: vertical; min-height: 110px; }

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  cursor: pointer;
}

.checkbox-item input[type="checkbox"] {
  width: 18px; height: 18px;
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.4rem;
}

.radio-btn {
  flex: 1;
  min-width: 130px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  cursor: pointer;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
  user-select: none;
}

.radio-btn:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent);
}

.radio-btn input { display: none; }

.form-hint {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-top: 0.3rem;
}

.form-section-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--text);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.form-submit-area {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.form-privacy {
  font-size: 0.78rem;
  color: var(--text-light);
}

.form-privacy a { color: var(--accent); text-decoration: underline; }

/* ── PAGE HERO VARIANTS ──────────────────────────────────── */
.page-hero {
  padding: 7rem 0 5rem;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.page-hero-accent {
  position: absolute;
  top: -80px; right: -80px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

/* ── TAGS / BADGES ───────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.tag.orange { background: var(--accent-glow); color: var(--accent); border-color: var(--accent); }
.tag.blue { background: rgba(28,78,122,0.12); color: var(--sky); border-color: var(--sky); }

/* ── FEATURES LIST ───────────────────────────────────────── */
.features-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.feature-check {
  width: 20px; height: 20px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.1rem;
  font-size: 0.65rem;
  color: white;
}

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: 0.25rem;
    backdrop-filter: blur(16px);
  }

  .form-row { grid-template-columns: 1fr; }
  .hero-drone-visual { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { flex-direction: column; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border); }
  .stat-item:last-child { border-bottom: none; }
  .form-card { padding: 1.5rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }
  .hero-ctas { flex-direction: column; align-items: flex-start; }
  .btn-xl { width: 100%; justify-content: center; }
}

/* ── ANIMATIONS ──────────────────────────────────────────── */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-up {
  animation: fade-up 0.7s ease both;
}
.fade-up-2 { animation-delay: 0.12s; }
.fade-up-3 { animation-delay: 0.22s; }
.fade-up-4 { animation-delay: 0.32s; }
.fade-up-5 { animation-delay: 0.44s; }

/* Success page */
.success-wrap {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
}

.success-icon {
  width: 72px; height: 72px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 2rem;
}