@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- DESIGN SYSTEM TOKENS (Vercel-inspired dark theme) --- */
:root {
  /* Colors */
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --bg-tertiary: #121212;
  --text-primary: #ffffff;
  --text-secondary: #a1a1a1;
  --text-muted: #666666;
  --border-color: #1f1f1f;
  --border-color-hover: #333333;
  --border-glow: rgba(255, 255, 255, 0.08);
  
  /* Brand/Accent Colors */
  --accent-blue: #0070f3;
  --accent-cyan: #50e3c2;
  --accent-purple: #7928ca;
  --accent-pink: #ff0080;
  --accent-orange: #ff4d4d;
  
  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  /* Spacing */
  --spacing-xxs: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 40px;
  --spacing-3xl: 48px;
  --spacing-4xl: 64px;
  --spacing-5xl: 96px;
  --spacing-section: 128px;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

/* --- ATMOSPHERIC BACKDROPS --- */
.mesh-gradient-container {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  max-width: 1600px;
  height: 850px;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}

.mesh-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
  mix-blend-mode: screen;
}

.glow-blue {
  top: -10%;
  left: 20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-blue) 0%, transparent 70%);
}

.glow-purple {
  top: 10%;
  right: 15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-purple) 0%, transparent 70%);
}

.glow-pink {
  top: 25%;
  left: 35%;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--accent-pink) 0%, transparent 70%);
}

/* --- LAYOUT & UTILITIES --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

section {
  padding: var(--spacing-section) 0;
  position: relative;
}

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.15;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(36px, 5vw, 64px);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.6;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-cyan);
  display: block;
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

/* --- HEADER / NAVIGATION --- */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: 64px;
  display: flex;
  align-items: center;
  transition: background 0.3s;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--border-color-hover) 100%);
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  color: var(--bg-primary);
  font-size: 12px;
}

.nav-cta-btn {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 13px;
  color: var(--bg-primary);
  background-color: var(--text-primary);
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  text-decoration: none;
  transition: background-color 0.2s, transform 0.2s;
  cursor: pointer;
}

.nav-cta-btn:hover {
  background-color: #e5e5e5;
  transform: translateY(-1px);
}

/* --- HERO SECTION --- */
.hero {
  padding-top: calc(var(--spacing-section) - 40px);
  padding-bottom: var(--spacing-section);
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  background: linear-gradient(180deg, #ffffff 40%, rgba(255, 255, 255, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  max-width: 620px;
  margin-bottom: var(--spacing-3xl);
  line-height: 1.5;
}

/* --- SIGNUP FORMS --- */
.signup-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--spacing-xl);
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  position: relative;
  overflow: hidden;
  text-align: left;
}

.signup-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-pink));
  opacity: 0.8;
}

.form-group {
  margin-bottom: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-input {
  background: #000000;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 12px var(--spacing-md);
  font-family: var(--font-sans);
  font-size: 15px;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-textarea {
  background: #000000;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 8px;
  padding: 12px var(--spacing-md);
  font-family: var(--font-sans);
  font-size: 15px;
  width: 100%;
  height: 90px;
  resize: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: #888888;
  box-shadow: 0 0 0 2px var(--border-glow);
}

.form-submit-btn {
  width: 100%;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  border-radius: 100px;
  padding: 14px var(--spacing-xl);
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

.form-submit-btn:hover {
  background-color: #e5e5e5;
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.1);
}

.form-submit-btn:active {
  transform: scale(0.98);
}

.form-submit-btn:disabled {
  background-color: var(--border-color-hover);
  color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.form-error-msg {
  color: var(--accent-orange);
  font-size: 13px;
  margin-top: var(--spacing-xs);
  display: none;
}

/* --- SUCCESS STATE --- */
.success-state {
  display: none;
  text-align: center;
  padding: var(--spacing-lg) 0;
  animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.success-icon-wrapper {
  width: 48px;
  height: 48px;
  background: rgba(80, 227, 194, 0.1);
  border: 1px solid var(--accent-cyan);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg) auto;
  color: var(--accent-cyan);
}

.success-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.success-desc {
  font-size: 15px;
  color: var(--text-secondary);
}

/* --- "HOW IT WORKS" --- */
.how-it-works {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.how-it-works::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1000px;
  height: 250px;
  background: radial-gradient(circle, rgba(121, 40, 202, 0.08), transparent 70%);
  filter: blur(50px);
  z-index: -1;
  pointer-events: none;
}

.section-lead {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--spacing-4xl) auto;
}

.section-lead h2 {
  margin-bottom: var(--spacing-xs);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1-up);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

@media(min-width: 768px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.step-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: var(--spacing-xl);
  position: relative;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.step-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.step-badge {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 2px 8px;
  width: fit-content;
  margin-bottom: var(--spacing-lg);
}

.step-card:hover .step-badge {
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.step-icon {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
}

.step-card h3 {
  font-size: 18px;
  margin-bottom: var(--spacing-xs);
  text-align: left;
}

.step-card p {
  font-size: 14px;
}

/* --- "WHY IT'S DIFFERENT" --- */
.why-different {
  position: relative;
}

.features-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
  max-width: 900px;
  margin: 0 auto;
}

.diff-card {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, rgba(10, 10, 10, 0.4) 100%);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: var(--spacing-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

@media(min-width: 768px) {
  .diff-card {
    flex-direction: row;
    align-items: center;
  }
}

.diff-content {
  flex: 1;
}

.diff-content h3 {
  font-size: clamp(22px, 3vw, 28px);
  margin-bottom: var(--spacing-md);
}

.diff-content p {
  font-size: 15px;
  margin-bottom: var(--spacing-md);
}

.diff-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
}

.diff-pill {
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 100px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.diff-pill svg {
  color: var(--accent-cyan);
}

.diff-graphic {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

/* Technical mockup representation */
.mockup-window {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.7);
  overflow: hidden;
}

.mockup-header {
  height: 32px;
  background-color: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  gap: 6px;
}

.mockup-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--border-color-hover);
}

.mockup-body {
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}

.mockup-line {
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mockup-line.active {
  color: var(--accent-cyan);
}

.mockup-line.original {
  color: var(--text-muted);
  text-decoration: line-through;
}

.mockup-line.rewritten {
  color: var(--text-primary);
  font-weight: 500;
  border-left: 2px solid var(--accent-cyan);
  padding-left: 6px;
}

/* --- BOTTOM CTA SECTION --- */
.bottom-cta {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  position: relative;
  text-align: center;
}

.bottom-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 800px;
  height: 100%;
  background: radial-gradient(circle, rgba(0, 112, 243, 0.05), transparent 60%);
  filter: blur(40px);
  z-index: -1;
  pointer-events: none;
}

.bottom-cta h2 {
  font-size: clamp(28px, 4vw, 38px);
  margin-bottom: var(--spacing-sm);
}

.bottom-cta p {
  max-width: 500px;
  margin: 0 auto var(--spacing-2xl) auto;
}

/* --- FOOTER --- */
footer {
  padding: var(--spacing-3xl) 0;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.footer-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

@media(min-width: 768px) {
  .footer-wrapper {
    flex-direction: row;
  }
}

.footer-logo {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.footer-link {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* --- UTILITY CLASSES --- */
.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;
}