/* ============================================
   RunSpark - Modern Design System
   ============================================ */

/* CSS Variables */
:root {
  --primary: #ff6b35;
  --primary-light: #ff8c5a;
  --primary-dark: #e55a2b;
  --secondary: #f7931e;
  --accent-teal: #4ecdc4;
  --accent-purple: #667eea;

  --bg-dark: #0a0a0f;
  --bg-card: #12121a;
  --bg-elevated: #1a1a24;

  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 107, 53, 0.4);

  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  --gradient-bg: radial-gradient(ellipse at top, #1a1a2e 0%, #0a0a0f 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(255, 107, 53, 0.3);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.3;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(255, 107, 53, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: white;
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-hover);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

.btn-full {
  width: 100%;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary);
  text-decoration: none;
}

.logo-icon {
  width: 28px;
  height: 28px;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
}

.nav-link {
  padding: 0.625rem 1.25rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(255, 107, 53, 0.1);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem;
  z-index: 999;
}

.mobile-menu.active {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 1rem;
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.mobile-menu a:hover {
  background: rgba(255, 255, 255, 0.05);
}

/* ============================================
   Page System
   ============================================ */

.page {
  display: none;
  min-height: 100vh;
  padding-top: 70px;
}

.page.active {
  display: block;
}

.page-header {
  padding: 4rem 0 3rem;
  background: var(--gradient-bg);
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  min-height: calc(100vh - 70px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  padding: 4rem 0;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  position: relative;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-bg);
  z-index: -1;
}

.hero-particles {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255, 107, 53, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(247, 147, 30, 0.1) 0%, transparent 40%);
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(255, 107, 53, 0.1);
  border: 1px solid rgba(255, 107, 53, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.hero-content h1 {
  font-size: 4.5rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-desc strong {
  color: var(--primary);
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.runner-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
}

.runner-group {
  animation: runnerBounce 2s ease-in-out infinite;
}

@keyframes runnerBounce {
  0%, 100% { transform: translate(160px, 180px); }
  50% { transform: translate(160px, 170px); }
}

.spark-dot {
  animation: sparkle 1.5s ease-in-out infinite;
}

.spark-dot:nth-child(2) { animation-delay: 0.3s; }
.spark-dot:nth-child(3) { animation-delay: 0.6s; }
.spark-dot:nth-child(4) { animation-delay: 0.9s; }

@keyframes sparkle {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.5); }
}

/* ============================================
   Concept Section
   ============================================ */

.concept-section {
  padding: 6rem 0;
  background: var(--bg-dark);
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.concept-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition-normal);
}

.concept-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.concept-card.highlight {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.15) 0%, rgba(247, 147, 30, 0.1) 100%);
  border-color: rgba(255, 107, 53, 0.4);
}

.concept-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
}

.concept-icon svg {
  width: 100%;
  height: 100%;
}

.concept-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.concept-meaning {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.concept-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ============================================
   How It Works Section
   ============================================ */

.how-section {
  padding: 6rem 0;
  background: var(--bg-card);
}

.steps-container {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.step {
  flex: 1;
  min-width: 250px;
  max-width: 300px;
  text-align: center;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0 auto 1.5rem;
}

.step-content {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
}

.step-icon svg {
  width: 100%;
  height: 100%;
}

.step-content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.step-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.step-connector {
  display: flex;
  align-items: center;
  padding-top: 40px;
}

.step-connector svg {
  width: 40px;
  height: 20px;
}

/* ============================================
   Stats Section
   ============================================ */

.stats-section {
  padding: 5rem 0;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.1) 0%, rgba(247, 147, 30, 0.05) 100%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-number {
  font-size: 3rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ============================================
   Coming Soon Section
   ============================================ */

.coming-soon-section {
  padding: 5rem 0;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08) 0%, rgba(10, 10, 15, 1) 100%);
  text-align: center;
}

.coming-soon-content {
  max-width: 600px;
  margin: 0 auto;
}

.coming-soon-badge {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: var(--gradient-primary);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  color: white;
  margin-bottom: 1.5rem;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

.coming-soon-content h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.coming-soon-content > p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 2rem;
}

.coming-soon-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.coming-feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.coming-feature-icon {
  font-size: 1.25rem;
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
  padding: 6rem 0;
  background: var(--bg-dark);
}

.cta-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-content p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

/* ============================================
   Category Section (GPX Page)
   ============================================ */

.category-section {
  padding: 2rem 0;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
}

.category-tabs {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.category-tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-tab:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.category-tab.active {
  background: rgba(255, 107, 53, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

.tab-icon {
  font-size: 1.2rem;
}

/* Subcategory Section */
.subcategory-section {
  padding: 2rem 0;
  background: var(--bg-dark);
}

.subcategory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.subcategory-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.subcategory-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.subcategory-card.active {
  border-color: var(--primary);
  background: rgba(255, 107, 53, 0.05);
}

.subcategory-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.subcategory-card h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.subcategory-card span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Filter Section */
.filter-section {
  padding: 1.5rem 0;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 70px;
  z-index: 100;
}

.filter-bar {
  display: flex;
  gap: 1rem;
  align-items: flex-end;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.filter-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.filter-group select {
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  min-width: 140px;
  cursor: pointer;
}

.filter-group select:focus {
  outline: none;
  border-color: var(--primary);
}

/* GPX Section */
.gpx-section {
  padding: 3rem 0;
  background: var(--bg-dark);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.results-header h2 {
  font-size: 1.5rem;
}

.results-count {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.gpx-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.gpx-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.gpx-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.gpx-card-image {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  position: relative;
  overflow: hidden;
}

.gpx-card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #2d3436 0%, #1a1a24 100%);
  z-index: 0;
}

.gpx-card-image > * {
  position: relative;
  z-index: 1;
}

.gpx-card-content {
  padding: 1.5rem;
}

.gpx-card-content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.gpx-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.gpx-meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.gpx-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  padding: 0.35rem 0.75rem;
  background: rgba(255, 107, 53, 0.1);
  color: var(--primary);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
}

.tag.difficulty-easy { background: rgba(78, 205, 196, 0.15); color: #4ecdc4; }
.tag.difficulty-medium { background: rgba(247, 147, 30, 0.15); color: #f7931e; }
.tag.difficulty-hard { background: rgba(255, 107, 53, 0.15); color: #ff6b35; }

/* ============================================
   Sparks Section
   ============================================ */

.sparks-section {
  padding: 3rem 0;
  background: var(--bg-dark);
}

.sparks-filter {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.spark-filter-btn {
  padding: 0.625rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.spark-filter-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.spark-filter-btn.active {
  background: rgba(255, 107, 53, 0.1);
  border-color: var(--primary);
  color: var(--primary);
}

.sparks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1.5rem;
}

.spark-card {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08) 0%, rgba(255, 107, 53, 0.02) 100%);
  border: 1px solid rgba(255, 107, 53, 0.2);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition-normal);
}

.spark-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.spark-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.spark-header h3 {
  font-size: 1.25rem;
}

.spark-status {
  padding: 0.35rem 0.75rem;
  background: var(--gradient-primary);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.spark-info {
  margin-bottom: 1.25rem;
}

.spark-info p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.spark-info strong {
  color: var(--text-primary);
}

.spark-route {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.spark-route-icon {
  font-size: 1.5rem;
}

.spark-route-info h4 {
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}

.spark-route-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.spark-guide {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.guide-avatar {
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.guide-info .label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.guide-info .name {
  font-weight: 600;
}

.spark-participants {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.participant-avatars {
  display: flex;
}

.participant-avatar {
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border: 2px solid var(--bg-card);
  border-radius: 50%;
  margin-left: -10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.participant-avatar:first-child {
  margin-left: 0;
}

.participant-count {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.join-btn {
  width: 100%;
  padding: 0.875rem;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.join-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.4);
}

/* ============================================
   Modals
   ============================================ */

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.modal-header {
  text-align: center;
  margin-bottom: 2rem;
}

.modal-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1rem;
}

.modal-icon svg {
  width: 100%;
  height: 100%;
}

.modal-header h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.modal-header p {
  color: var(--text-secondary);
}

/* GPX Detail Modal */
.gpx-detail-image {
  height: 140px;
  background: linear-gradient(135deg, #2d3436 0%, #1a1a24 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

/* GPX Map */
.gpx-map-container {
  height: 250px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

#gpx-map {
  height: 100%;
  width: 100%;
  background: #1a1a24;
}

.gpx-map-info {
  display: flex;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 107, 53, 0.1);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.gpx-map-info-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.gpx-map-info-item .icon {
  font-size: 1.2rem;
}

.gpx-map-info-item .label {
  color: var(--text-muted);
}

.gpx-map-info-item .value {
  color: var(--text-primary);
  font-weight: 600;
}

.gpx-detail-header h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.gpx-detail-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.gpx-detail-meta span {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.gpx-detail-desc {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.gpx-detail-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.related-sparks {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.related-sparks h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.mini-spark-card {
  background: rgba(255, 107, 53, 0.05);
  border: 1px solid rgba(255, 107, 53, 0.2);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.mini-spark-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
}

.mini-spark-card p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
  margin-bottom: 1.25rem;
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
}

.footer-brand p {
  color: var(--text-secondary);
  max-width: 300px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 4rem;
}

.footer-col h4 {
  font-size: 0.9rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer-col a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ============================================
   Contact Page
   ============================================ */

.contact-header {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.15) 0%, rgba(10, 10, 15, 1) 100%);
}

.contact-section {
  padding: 4rem 0;
  background: var(--bg-dark);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-info h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.contact-info > p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.contact-features {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-feature {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.contact-feature:hover {
  border-color: var(--border-hover);
  transform: translateX(5px);
}

.contact-feature .feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(255, 107, 53, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
}

.contact-feature h4 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
}

.contact-feature p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.contact-form-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
}

.contact-form h3 {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
}

.contact-form .form-group {
  margin-bottom: 1.5rem;
}

.contact-form .form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.contact-form .form-group input,
.contact-form .form-group select,
.contact-form .form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.contact-form .form-group input:focus,
.contact-form .form-group select:focus,
.contact-form .form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

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

.contact-form .form-group select {
  cursor: pointer;
}

.contact-form .form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form .btn {
  margin-top: 1rem;
}

/* Form Success Message */
.form-success {
  text-align: center;
  padding: 3rem 2rem;
}

.form-success-icon {
  width: 80px;
  height: 80px;
  background: rgba(34, 197, 94, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: #22c55e;
}

.form-success h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.form-success p {
  color: var(--text-secondary);
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.empty-state p {
  color: var(--text-muted);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-illustration {
    order: -1;
  }

  .runner-svg {
    max-width: 300px;
  }

  .concept-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-container {
    flex-direction: column;
    align-items: center;
  }

  .step-connector {
    transform: rotate(90deg);
    padding: 0;
    margin: 1rem 0;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-content h1 {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .concept-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group {
    width: 100%;
  }

  .filter-group select {
    width: 100%;
  }

  .gpx-grid {
    grid-template-columns: 1fr;
  }

  .sparks-grid {
    grid-template-columns: 1fr;
  }

  .gpx-detail-actions {
    grid-template-columns: 1fr;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-links {
    gap: 2rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .stat-number {
    font-size: 2.5rem;
  }

  /* Contact Page Mobile */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact-form-container {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .category-tabs {
    flex-direction: column;
  }

  .category-tab {
    width: 100%;
    justify-content: center;
  }
}