/* ==========================================================================
   aspen.hnnilovey.me / uuina.space/aspen
   Linear / Vercel Style Minimalist Obsidian Dark Theme
   Design Principles: Ultra-Pure Obsidian Black (#000), Slate Gray Accents,
   Cool Indigo & Pure White Highlights, Monospaced Accents, Interactive Tabs & Toast
   ========================================================================== */

:root {
  /* Obsidian & Vercel Palette */
  --bg-main: #000000;
  --bg-surface: #0a0a0a;
  --bg-card: #121212;
  --bg-card-hover: #1a1a1a;
  --bg-input: #171717;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.2);
  --border-focus: #6366f1;
  
  /* Accent Colors */
  --accent-indigo: #6366f1;
  --accent-violet: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  /* Typography Colors */
  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-muted: #737373;
  --text-dim: #525252;
  
  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Border Radius */
  --radius-xl: 14px;
  --radius-lg: 10px;
  --radius-md: 8px;
  --radius-sm: 6px;
  --radius-full: 9999px;
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden !important;
}

body {
  overflow-x: hidden !important;
  width: 100%;
  max-width: 100vw;
  position: relative;
  min-height: 100vh;
  background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
              var(--bg-main);
}

.container {
  width: 90%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Background Grid Mesh */
.bg-glow-container {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
                    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 0%, #000 40%, transparent 100%);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(0, 0, 0, 0.78);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.brand-badge {
  width: 28px;
  height: 28px;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-violet);
  font-size: 0.85rem;
}

.brand-text .dot {
  color: var(--accent-indigo);
}

.nav-links {
  display: flex;
  gap: 1.8rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.88rem;
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.btn-nav-home {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.82rem;
  transition: var(--transition);
}

.btn-nav-home:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.mobile-toggle-btn {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

/* Mobile Drawer */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  top: 60px;
  z-index: 99;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.mobile-drawer-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer-content {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem;
  transform: translateY(-20px);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-drawer-overlay.active .mobile-drawer-content {
  transform: translateY(0);
}

.mobile-drawer-links {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.mobile-nav-link {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1rem;
  font-family: var(--font-heading);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.mobile-nav-link:hover {
  background: var(--bg-card-hover);
  color: var(--accent-violet);
}

/* Hero Section */
.hero-section {
  padding: 130px 0 70px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-indigo);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-indigo);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.4); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.7rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.2rem;
  color: var(--text-primary);
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.02rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 2rem;
  line-height: 1.65;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
  margin-bottom: 2.2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--text-primary);
  color: #000;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary:hover {
  background: #e5e5e5;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(255, 255, 255, 0.15);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  color: var(--accent-violet);
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

/* Detailed Step Tutorial Styling */
.step-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.8rem;
  margin-bottom: 1.8rem;
  transition: var(--transition);
}

.step-item:hover {
  border-color: var(--border-hover);
}

.step-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
}

.step-badge {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-violet);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.step-img-box {
  background: #000000;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.6rem;
  text-align: center;
  margin-top: 1rem;
}

.step-img-box img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  margin: 0 auto;
}

/* Code Snippet Box */
.code-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7);
}

.code-card-header {
  background: var(--bg-card);
  padding: 0.7rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.term-dots {
  display: flex;
  gap: 6px;
}

.term-dots .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.term-dots .red { background-color: #ef4444; }
.term-dots .yellow { background-color: #f59e0b; }
.term-dots .green { background-color: #10b981; }

.term-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.code-card-body {
  padding: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.6;
  overflow-x: auto;
}

.code-comment { color: var(--text-dim); }
.code-keyword { color: var(--accent-violet); }
.code-str { color: #34d399; }
.code-success { color: #10b981; font-weight: 600; }
.code-cmd { color: #38bdf8; }

/* Section Header */
.section {
  padding: 80px 0;
  border-top: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem;
}

.subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent-violet);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.8rem;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Download Section Cards */
.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: stretch;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
}

.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.2rem;
  width: fit-content;
}

.badge-blue {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-violet);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-green {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.file-meta-table {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.file-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  font-size: 0.83rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.file-meta-row:last-child {
  border-bottom: none;
}

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

.meta-val {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 500;
}

/* Tabs */
.tabs-header {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-card);
  padding: 0.35rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  margin-bottom: 1.2rem;
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.cmd-box {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: auto;
  margin-bottom: 1rem;
}

.cmd-box pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-all;
}

.btn-copy-code {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy-code:hover {
  background: var(--border-hover);
  color: var(--text-primary);
}

/* AI Agent Section */
.ai-agent-container {
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.05) 0%, rgba(10, 10, 10, 0.6) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}

.ai-agent-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.ai-workflow-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
  margin-bottom: 2.2rem;
}

.workflow-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-violet);
  margin-bottom: 0.4rem;
  font-weight: 600;
}

.step-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.step-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Prompt Card */
.prompt-card {
  background: #050505;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.prompt-card-header {
  background: #0f0f0f;
  padding: 0.8rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.prompt-card-body {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  color: #e2e8f0;
  background: #050505;
  max-height: 380px;
  overflow-y: auto;
  white-space: pre-wrap;
}

/* Pitfalls & FAQ Section */
.pitfalls-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}

.pitfall-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  transition: var(--transition);
}

.pitfall-item:hover {
  border-color: var(--border-hover);
}

.pitfall-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.pitfall-title-wrapper {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.pitfall-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.icon-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.icon-warning {
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.icon-info {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.pitfall-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.chevron-icon {
  color: var(--text-muted);
  transition: transform 0.25s ease;
}

.pitfall-item.open .chevron-icon {
  transform: rotate(180deg);
}

.pitfall-content {
  display: none;
  padding-top: 1.2rem;
  margin-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.pitfall-item.open .pitfall-content {
  display: block;
}

.solution-box {
  background: var(--bg-card);
  border-left: 3px solid var(--accent-indigo);
  padding: 0.8rem 1.2rem;
  margin-top: 0.8rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 0.85rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

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

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #18181b;
  border: 1px solid var(--border-hover);
  color: #ffffff;
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius-lg);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.toast i {
  color: var(--accent-green);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .ai-workflow-grid {
    grid-template-columns: 1fr 1fr;
  }
  .nav-links {
    display: none;
  }
  .mobile-toggle-btn {
    display: flex;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 2.1rem;
  }
  .ai-workflow-grid {
    grid-template-columns: 1fr;
  }
  .ai-agent-container {
    padding: 1.5rem;
  }
}