/* ============================================
   MailRambo Landing Page — Dark Techy Theme
   ============================================ */

/* --- Design Tokens --- */
:root {
  --color-bg: #0a0a0f;
  --color-bg-elevated: #12121a;
  --color-bg-card: #1a1a2e;
  --color-bg-card-hover: #22223a;
  --color-surface: #16161f;
  --color-border: #2a2a3e;
  --color-text: #e4e4ef;
  --color-text-secondary: #9090a8;
  --color-text-muted: #5e5e78;
  --color-accent: #6366f1;
  --color-accent-light: #818cf8;
  --color-accent-dark: #4f46e5;
  --color-accent-glow: rgba(99, 102, 241, 0.25);
  --color-green: #22c55e;
  --color-green-glow: rgba(34, 197, 94, 0.2);
  --color-red: #ef4444;
  --color-yellow: #eab308;
  --color-orange: #f97316;
  --gradient-accent: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);
  --gradient-hero: linear-gradient(180deg, #0a0a0f 0%, #12121a 100%);
  --gradient-card: linear-gradient(145deg, #1a1a2e, #12121a);
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px var(--color-accent-glow);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* --- Utility --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  background: var(--color-accent-glow);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 48px;
}

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

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

/* Progressive enhancement: content visible by default.
   JS adds .js-loaded to body, then animations activate. */
.js-loaded .fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-loaded .fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all var(--transition-base);
  background: transparent;
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
}

.nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.nav-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.nav-cta {
  padding: 8px 20px;
  background: var(--color-accent);
  color: #fff !important;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-accent-dark);
  box-shadow: var(--shadow-glow);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

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

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding: 120px 24px 96px;
}

.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-accent-light);
  background: var(--color-accent-glow);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-glow);
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px var(--color-accent-glow);
  color: #fff;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}

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

.hero-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.hero-stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* --- Social Proof --- */
.social-proof {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.social-proof p {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.proof-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
  opacity: 0.4;
}

.proof-logos span {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

/* --- Problem Section --- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.problem-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-base);
}

.problem-card:hover {
  border-color: rgba(239, 68, 68, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(239, 68, 68, 0.1);
}

.problem-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.problem-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.problem-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.problem-stat {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-red);
  background: rgba(239, 68, 68, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

/* --- Features Section --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.feature-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-glow);
  border-radius: var(--radius-md);
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- How It Works --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.3;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent-light);
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}

.step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.step p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Terminal Demo --- */
.demo-section {
  background: var(--color-bg-elevated);
}

.demo-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.terminal {
  background: #0d0d14;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal-dot.red { background: #ef4444; }
.terminal-dot.yellow { background: #eab308; }
.terminal-dot.green { background: #22c55e; }

.terminal-title {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-left: 8px;
  font-family: var(--font-mono);
}

.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.8;
}

.terminal-line {
  display: block;
  margin-bottom: 2px;
}

.terminal-prompt {
  color: var(--color-green);
}

.terminal-command {
  color: var(--color-text);
}

.terminal-output {
  color: var(--color-text-secondary);
}

.terminal-success {
  color: var(--color-green);
}

.terminal-warning {
  color: var(--color-yellow);
}

.terminal-error {
  color: var(--color-red);
}

.terminal-accent {
  color: var(--color-accent-light);
}

.demo-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.demo-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 0.95rem;
  line-height: 1.5;
}

.check-icon {
  width: 24px;
  height: 24px;
  min-width: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-green-glow);
  color: var(--color-green);
  border-radius: 50%;
  font-size: 0.75rem;
  margin-top: 2px;
}

/* --- Lead Grading --- */
.grading-section {
  background: var(--color-bg);
}

.grades-container {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 48px;
}

.grade-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 20px 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  min-width: 100px;
}

.grade-chip:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.grade-letter {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.grade-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.grade-a .grade-letter { color: #22c55e; }
.grade-a { border-color: rgba(34, 197, 94, 0.3); }
.grade-b .grade-letter { color: #4ade80; }
.grade-b { border-color: rgba(74, 222, 128, 0.2); }
.grade-c .grade-letter { color: #eab308; }
.grade-c { border-color: rgba(234, 179, 8, 0.2); }
.grade-d .grade-letter { color: #f97316; }
.grade-d { border-color: rgba(249, 115, 22, 0.2); }
.grade-f .grade-letter { color: #ef4444; }
.grade-f { border-color: rgba(239, 68, 68, 0.3); }

/* --- ROI Section --- */
.roi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.roi-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition-base);
}

.roi-card:hover {
  border-color: rgba(34, 197, 94, 0.3);
  transform: translateY(-4px);
}

.roi-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-green);
  margin-bottom: 8px;
}

.roi-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* --- Waitlist CTA --- */
.waitlist-section {
  background: var(--color-bg-elevated);
  position: relative;
  overflow: hidden;
}

.waitlist-section::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  bottom: -200px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.waitlist-box {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.waitlist-form {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

.waitlist-input {
  flex: 1;
  padding: 14px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: var(--font-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.waitlist-input::placeholder {
  color: var(--color-text-muted);
}

.waitlist-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.waitlist-btn {
  padding: 14px 28px;
  background: var(--gradient-accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-primary);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.waitlist-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.waitlist-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.waitlist-message {
  margin-top: 16px;
  font-size: 0.9rem;
  min-height: 24px;
}

.waitlist-message.success {
  color: var(--color-green);
}

.waitlist-message.error {
  color: var(--color-red);
}

.waitlist-note {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* --- Footer --- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

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

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

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.footer-credit {
  width: 100%;
  text-align: center;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .features-grid,
  .problem-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .demo-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 15, 0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    z-index: 99;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.2rem;
  }

  .mobile-toggle {
    display: flex;
    z-index: 101;
  }

  .features-grid,
  .problem-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .steps::before {
    display: none;
  }

  .hero-stats {
    flex-direction: column;
    gap: 24px;
  }

  .waitlist-form {
    flex-direction: column;
  }

  .footer .container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .grades-container {
    gap: 10px;
  }

  .grade-chip {
    padding: 14px 18px;
    min-width: 70px;
  }

  .proof-logos {
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 100px 16px 64px;
  }

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

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .fade-up {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }

  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}