/* ========================================
   ThriftFlip Landing Page — Design System
   ======================================== */

/* --- Google Font --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

/* --- Custom Properties --- */
:root {
  /* Colors */
  --c-bg:         #000000;
  --c-bg-card:    #111111;
  --c-bg-card-2:  #1a1a1a;
  --c-bg-subtle:  #222222;
  --c-border:     #2a2a2a;
  --c-text:       #f0f0f0;
  --c-text-muted: #888888;
  --c-text-dim:   #555555;
  --c-accent:     #4ade80;
  --c-accent-dim: rgba(74, 222, 128, 0.15);
  --c-accent-glow:rgba(74, 222, 128, 0.25);
  --c-white:      #ffffff;

  /* Typography */
  --font-family:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --fs-xs:   0.75rem;   /* 12px */
  --fs-sm:   0.875rem;  /* 14px */
  --fs-base: 1rem;      /* 16px */
  --fs-lg:   1.125rem;  /* 18px */
  --fs-xl:   1.25rem;   /* 20px */
  --fs-2xl:  1.5rem;    /* 24px */
  --fs-3xl:  1.875rem;  /* 30px */
  --fs-4xl:  2.25rem;   /* 36px */
  --fs-5xl:  3rem;      /* 48px */
  --fs-6xl:  3.75rem;   /* 60px */
  --fs-hero: clamp(2.5rem, 6vw, 4.5rem);

  /* Spacing */
  --sp-xs:  0.25rem;
  --sp-sm:  0.5rem;
  --sp-md:  1rem;
  --sp-lg:  1.5rem;
  --sp-xl:  2rem;
  --sp-2xl: 3rem;
  --sp-3xl: 4rem;
  --sp-4xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;

  /* Misc */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- 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-family);
  background-color: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--c-white);
}

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

ul { list-style: none; }

/* --- Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-xl);
}

.section {
  padding: var(--sp-4xl) 0;
}

.section-label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-dim);
  padding: var(--sp-xs) var(--sp-md);
  border-radius: var(--radius-full);
  margin-bottom: var(--sp-lg);
}

.section-title {
  font-size: var(--fs-4xl);
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: var(--sp-md);
}

.section-subtitle {
  font-size: var(--fs-lg);
  color: var(--c-text-muted);
  max-width: 560px;
}

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

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* --- Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Gradient Glow Background --- */
.glow-blob {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--c-accent-glow), transparent 70%);
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
}

/* ====================
   NAVIGATION
   ==================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.nav-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.nav-name {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--c-white);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
}

.nav-links a {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--c-text-muted);
  transition: color var(--transition);
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: var(--c-accent);
  color: #000 !important;
  font-weight: 700 !important;
  font-size: var(--fs-sm) !important;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  transition: transform var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--c-accent-glow);
  color: #000 !important;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: var(--transition);
}

/* ====================
   HERO
   ==================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 580px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: var(--c-accent-dim);
  color: var(--c-accent);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: var(--sp-xs) var(--sp-md);
  border-radius: var(--radius-full);
  margin-bottom: var(--sp-xl);
  border: 1px solid rgba(74, 222, 128, 0.2);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--c-accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-size: var(--fs-hero);
  font-weight: 900;
  letter-spacing: -1.5px;
  line-height: 1.05;
  margin-bottom: var(--sp-lg);
}

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

.hero-subtitle {
  font-size: var(--fs-xl);
  color: var(--c-text-muted);
  line-height: 1.6;
  margin-bottom: var(--sp-2xl);
  max-width: 480px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: var(--c-accent);
  color: #000;
  font-size: var(--fs-base);
  font-weight: 800;
  padding: 16px 32px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  letter-spacing: 0.5px;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--c-accent-glow);
  color: #000;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-sm);
  background: transparent;
  color: var(--c-text);
  font-size: var(--fs-base);
  font-weight: 600;
  padding: 16px 32px;
  border-radius: var(--radius-full);
  border: 1px solid var(--c-border);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.btn-secondary:hover {
  border-color: var(--c-text-muted);
  background: rgba(255, 255, 255, 0.04);
  color: var(--c-white);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-image img {
  max-height: 600px;
  width: auto;
  filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.5));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.hero .glow-blob {
  top: 10%;
  right: -10%;
}

/* ====================
   HOW IT WORKS
   ==================== */
.how-it-works {
  background: var(--c-bg-card);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-2xl);
  margin-top: var(--sp-3xl);
  position: relative;
}

/* Connecting line */
.steps-grid::before {
  content: '';
  position: absolute;
  top: 44px;
  left: calc(16.66% + 20px);
  right: calc(16.66% + 20px);
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-dim), var(--c-accent));
  z-index: 0;
}

.step-card {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-icon {
  width: 88px;
  height: 88px;
  margin: 0 auto var(--sp-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg);
  border: 2px solid var(--c-border);
  border-radius: 50%;
  font-size: 36px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.step-card:hover .step-icon {
  border-color: var(--c-accent);
  box-shadow: 0 0 30px var(--c-accent-glow);
}

.step-number {
  font-size: var(--fs-xs);
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--sp-sm);
}

.step-title {
  font-size: var(--fs-2xl);
  font-weight: 800;
  margin-bottom: var(--sp-sm);
}

.step-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  max-width: 280px;
  margin: 0 auto;
}

/* ====================
   FEATURES
   ==================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-lg);
  margin-top: var(--sp-3xl);
}

.feature-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-2xl);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  border-color: rgba(74, 222, 128, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-accent-dim);
  border-radius: var(--radius-md);
  font-size: 26px;
  margin-bottom: var(--sp-lg);
}

.feature-title {
  font-size: var(--fs-xl);
  font-weight: 800;
  margin-bottom: var(--sp-sm);
}

.feature-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: 1.7;
}

/* ====================
   PRICING
   ==================== */
.pricing {
  position: relative;
  overflow: hidden;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-xl);
  margin-top: var(--sp-3xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  padding: var(--sp-2xl);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition);
}

.pricing-card.featured {
  border-color: var(--c-accent);
  position: relative;
  box-shadow: 0 0 40px var(--c-accent-glow);
}

.pricing-card.featured::before {
  content: 'MOST POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-accent);
  color: #000;
  font-size: var(--fs-xs);
  font-weight: 800;
  letter-spacing: 1px;
  padding: 4px 16px;
  border-radius: var(--radius-full);
}

.pricing-card:hover {
  transform: translateY(-4px);
}

.pricing-tier {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: var(--sp-md);
}

.pricing-price {
  font-size: var(--fs-5xl);
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: var(--sp-xs);
}

.pricing-price .period {
  font-size: var(--fs-lg);
  font-weight: 500;
  color: var(--c-text-muted);
}

.pricing-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  margin-bottom: var(--sp-xl);
  padding-bottom: var(--sp-xl);
  border-bottom: 1px solid var(--c-border);
}

.pricing-features {
  flex: 1;
  margin-bottom: var(--sp-xl);
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  font-size: var(--fs-sm);
  color: var(--c-text);
  margin-bottom: var(--sp-md);
}

.pricing-features li .check {
  color: var(--c-accent);
  font-weight: 700;
  font-size: var(--fs-base);
}

.pricing-features li.disabled {
  color: var(--c-text-dim);
}

.pricing-features li.disabled .check {
  color: var(--c-text-dim);
}

.pricing-btn {
  display: block;
  text-align: center;
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--fs-sm);
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.pricing-btn.primary {
  background: var(--c-accent);
  color: #000;
}

.pricing-btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--c-accent-glow);
  color: #000;
}

.pricing-btn.outline {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.pricing-btn.outline:hover {
  border-color: var(--c-text-muted);
  color: var(--c-white);
}

/* ====================
   FAQ
   ==================== */
.faq-list {
  max-width: 720px;
  margin: var(--sp-3xl) auto 0;
}

.faq-item {
  border-bottom: 1px solid var(--c-border);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-xl) 0;
  background: none;
  border: none;
  color: var(--c-text);
  font-size: var(--fs-lg);
  font-weight: 700;
  font-family: var(--font-family);
  cursor: pointer;
  text-align: left;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--c-accent);
}

.faq-question .icon {
  font-size: var(--fs-xl);
  color: var(--c-text-muted);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: var(--sp-md);
}

.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  line-height: 1.7;
  padding-bottom: var(--sp-xl);
}

/* ====================
   CALL TO ACTION
   ==================== */
.cta-section {
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-box {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  padding: var(--sp-4xl) var(--sp-3xl);
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-accent), transparent);
}

.cta-title {
  font-size: var(--fs-4xl);
  font-weight: 900;
  margin-bottom: var(--sp-md);
}

.cta-subtitle {
  font-size: var(--fs-lg);
  color: var(--c-text-muted);
  margin-bottom: var(--sp-2xl);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ====================
   FOOTER
   ==================== */
.footer {
  border-top: 1px solid var(--c-border);
  padding: var(--sp-3xl) 0 var(--sp-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--sp-3xl);
  margin-bottom: var(--sp-3xl);
}

.footer-brand-desc {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  margin-top: var(--sp-md);
  max-width: 300px;
  line-height: 1.7;
}

.footer-col-title {
  font-size: var(--fs-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--c-text);
  margin-bottom: var(--sp-lg);
}

.footer-col a {
  display: block;
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  margin-bottom: var(--sp-sm);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-xl);
  border-top: 1px solid var(--c-border);
  font-size: var(--fs-xs);
  color: var(--c-text-dim);
}

/* ====================
   LEGAL PAGES
   ==================== */
.legal-page {
  padding-top: calc(var(--nav-height) + var(--sp-3xl));
  padding-bottom: var(--sp-4xl);
}

.legal-page h1 {
  font-size: var(--fs-4xl);
  font-weight: 900;
  margin-bottom: var(--sp-md);
}

.legal-page .last-updated {
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  margin-bottom: var(--sp-3xl);
}

.legal-page h2 {
  font-size: var(--fs-xl);
  font-weight: 800;
  margin-top: var(--sp-2xl);
  margin-bottom: var(--sp-md);
}

.legal-page p {
  font-size: var(--fs-base);
  color: var(--c-text-muted);
  line-height: 1.8;
  margin-bottom: var(--sp-md);
}

.legal-page ul {
  list-style: disc;
  padding-left: var(--sp-xl);
  margin-bottom: var(--sp-md);
}

.legal-page ul li {
  font-size: var(--fs-base);
  color: var(--c-text-muted);
  line-height: 1.8;
  margin-bottom: var(--sp-sm);
}

/* ====================
   RESPONSIVE
   ==================== */
@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
    order: 1;
  }

  .hero-subtitle {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

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

  .hero-image {
    order: 0;
    margin-bottom: var(--sp-xl);
  }

  .hero-image img {
    max-height: 380px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-2xl);
  }

  .steps-grid::before {
    display: none;
  }

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-2xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--sp-md);
    text-align: center;
  }

  /* Mobile nav */
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: var(--sp-xl);
    gap: var(--sp-lg);
    border-bottom: 1px solid var(--c-border);
  }

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

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.25rem;
  }

  .section-title {
    font-size: var(--fs-3xl);
  }

  .cta-title {
    font-size: var(--fs-3xl);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}