/* =========================
   CSS Variables (PROMOTIONAL_WEBSITE_PLAN.md 기준)
   ========================= */
:root {
  /* Primary Colors - 무채색 팔레트 */
  --color-primary: #222222;
  --color-white: #FFFFFF;
  --color-grey-1: #888888;
  --color-grey-2: #AAAAAA;
  --color-grey-5: #555555;
  --color-bg-light: #F8F8F8;
  --color-bg-grey: #EEEEEE;

  /* Extended Grays */
  --color-grey-100: #F7F7F7;
  --color-grey-200: #EEEEEE;
  --color-grey-300: #DDDDDD;
  --color-grey-400: #CCCCCC;
  --color-grey-600: #666666;
  --color-grey-700: #444444;
  --color-grey-800: #333333;
  --color-grey-900: #1A1A1A;

  /* Typography */
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Layout */
  --max-width: 1200px;
  --section-padding: 100px 24px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.14);
  --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.18);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
}

/* =========================
   Animations
   ========================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Hero animations */
.hero-content {
  animation: fadeInUp 0.8s ease-out forwards;
}

.hero-mockups {
  animation: fadeInUp 0.8s ease-out 0.2s forwards;
  opacity: 0;
}

body.loaded .hero-mockups {
  opacity: 1;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: -0.48px;
  color: var(--color-primary);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

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

ul {
  list-style: none;
}

/* =========================
   Typography
   ========================= */
h1 {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -1.44px;
  line-height: 1.15;
}

h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.96px;
  line-height: 1.25;
}

h3 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.72px;
  line-height: 1.35;
}

.small {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.42px;
}

/* =========================
   Layout
   ========================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  font-size: 18px;
  color: var(--color-grey-5);
  max-width: 600px;
  margin: 0 auto;
}

/* =========================
   Buttons
   ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-grey-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  opacity: 1;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-grey-300);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  opacity: 1;
}

/* =========================
   Header
   ========================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-bg-grey);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo img {
  width: 36px;
  height: 36px;
}

.logo span {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-grey-5);
}

.nav a:hover {
  color: var(--color-primary);
  opacity: 1;
}

/* Mobile menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin: 5px 0;
  transition: 0.3s;
  border-radius: 2px;
}

/* =========================
   Hero Section
   ========================= */
.hero {
  padding: 120px 24px 60px;
  background: var(--color-bg-light);
  background-image: url('../images/hero-bg.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  overflow: hidden;
  min-height: auto;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.92) 0%,
    rgba(248, 248, 248, 0.8) 40%,
    rgba(248, 248, 248, 0.7) 70%,
    rgba(248, 248, 248, 0.85) 100%
  );
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.hero-content {
  flex: 1;
  max-width: 560px;
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--color-white);
  color: var(--color-grey-5);
  font-size: 14px;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 28px;
  border: 1px solid var(--color-bg-grey);
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-grey-5);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  justify-content: flex-start;
  gap: 16px;
  margin-bottom: 0;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.store-btn:hover {
  background: var(--color-grey-800);
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  opacity: 1;
}

.store-btn-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.store-btn-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.store-btn-text small {
  font-size: 11px;
  font-weight: 400;
  opacity: 0.7;
}

.store-btn-text span {
  font-size: 16px;
  font-weight: 600;
}

/* Hero Mockups */
.hero-mockups {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.mockup-wrapper {
  position: relative;
}

.mockup-wrapper:only-child {
  transform: none;
}

.mockup-wrapper:first-child:not(:only-child) {
  transform: rotateY(5deg) translateZ(0);
}

.mockup-wrapper:last-child:not(:only-child) {
  transform: rotateY(-5deg) translateZ(0);
}

.hero-mockups img {
  width: 340px;
  height: auto;
  transition: all 0.4s ease;
}

.mockup-wrapper:hover img {
  transform: translateY(-8px);
}

/* =========================
   Features Section
   ========================= */
.features {
  background: var(--color-white);
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  position: relative;
  padding: 40px 28px;
  background: var(--color-bg-light);
  border-radius: var(--radius-xl);
  border: 1px solid transparent;
  transition: all 0.4s ease;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-bg-grey);
  background: var(--color-white);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  border: 1px solid var(--color-bg-grey);
  border-radius: var(--radius-lg);
  margin-bottom: 20px;
  color: var(--color-primary);
  transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 15px;
  color: var(--color-grey-5);
  line-height: 1.6;
}

/* =========================
   How It Works Section
   ========================= */
.how-it-works {
  background: var(--color-bg-light);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 20%;
  right: 20%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-grey-300), var(--color-grey-300), transparent);
}

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

.step-number {
  width: 80px;
  height: 80px;
  background: var(--color-white);
  border: 3px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 700;
  margin: 0 auto 24px;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

.step:hover .step-number {
  background: var(--color-primary);
  color: var(--color-white);
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.step h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.step p {
  font-size: 15px;
  color: var(--color-grey-5);
  max-width: 280px;
  margin: 0 auto;
}

/* =========================
   Pricing Section
   ========================= */
.pricing {
  background: var(--color-white);
}

.pricing-card {
  max-width: 440px;
  margin: 0 auto;
  background: var(--color-white);
  border-radius: var(--radius-2xl);
  padding: 48px 40px;
  text-align: center;
  border: 2px solid var(--color-bg-grey);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.pricing-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
  transform: translateY(-4px);
}

.pricing-badge {
  position: absolute;
  top: 24px;
  right: -32px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 40px;
  transform: rotate(45deg);
}

.pricing-card h3 {
  font-size: 18px;
  color: var(--color-grey-5);
  font-weight: 500;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 52px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -2px;
}

.pricing-price span {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-grey-1);
}

.pricing-desc {
  font-size: 14px;
  color: var(--color-grey-1);
  margin-bottom: 32px;
}

.pricing-features {
  margin: 32px 0;
  text-align: left;
}

.pricing-features li {
  padding: 12px 0;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--color-bg-grey);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li::before {
  content: "✓";
  width: 24px;
  height: 24px;
  background: var(--color-bg-light);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
  margin-top: 24px;
}

.pricing-note {
  font-size: 13px;
  color: var(--color-grey-1);
  margin-top: 16px;
}

/* =========================
   FAQ Section
   ========================= */
.faq {
  background: var(--color-bg-light);
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid var(--color-bg-grey);
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: var(--color-grey-300);
}

.faq-item.active {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 24px 28px;
  background: none;
  border: none;
  text-align: left;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-family);
  color: var(--color-primary);
}

.faq-question::after {
  content: "+";
  font-size: 24px;
  font-weight: 400;
  color: var(--color-grey-1);
  transition: all 0.3s ease;
}

.faq-item.active .faq-question::after {
  content: "−";
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 28px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 28px 24px;
  max-height: 300px;
}

.faq-answer p {
  font-size: 16px;
  color: var(--color-grey-5);
  line-height: 1.7;
}

/* =========================
   CTA Section
   ========================= */
.cta {
  background: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta .container {
  position: relative;
  z-index: 1;
}

.cta h2 {
  margin-bottom: 16px;
}

.cta p {
  font-size: 18px;
  color: var(--color-grey-2);
  margin-bottom: 40px;
}

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

.cta .store-btn {
  background: var(--color-white);
  color: var(--color-primary);
}

.cta .store-btn:hover {
  background: var(--color-bg-light);
  box-shadow: var(--shadow-lg);
}

/* =========================
   Footer
   ========================= */
.footer {
  background: var(--color-bg-light);
  padding: 64px 24px;
  border-top: 1px solid var(--color-bg-grey);
}

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

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
}

.footer-logo img {
  width: 28px;
  height: 28px;
}

.footer-logo span {
  font-size: 18px;
  font-weight: 700;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-grey-5);
}

.footer-links a:hover {
  color: var(--color-primary);
  opacity: 1;
}

.footer-contact {
  font-size: 14px;
  color: var(--color-grey-1);
  margin-bottom: 16px;
}

.footer-copyright {
  font-size: 13px;
  color: var(--color-grey-2);
}

/* =========================
   Legal Pages
   ========================= */
.legal-page {
  padding-top: 120px;
  min-height: 100vh;
}

.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px 100px;
}

.legal-content h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

.legal-date {
  font-size: 14px;
  color: var(--color-grey-1);
  margin-bottom: 48px;
}

.legal-content h2 {
  font-size: 20px;
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.legal-content p {
  margin-bottom: 16px;
  color: var(--color-grey-5);
  line-height: 1.8;
}

.legal-content ul {
  margin-bottom: 16px;
  padding-left: 24px;
}

.legal-content li {
  margin-bottom: 12px;
  color: var(--color-grey-5);
  list-style: disc;
  line-height: 1.7;
}

.legal-content a {
  color: var(--color-primary);
  text-decoration: underline;
}

.legal-content a:hover {
  opacity: 0.7;
}

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

@media (max-width: 768px) {
  h1 {
    font-size: 32px;
    letter-spacing: -0.96px;
  }

  h2 {
    font-size: 24px;
    letter-spacing: -0.72px;
  }

  .header .container {
    height: 64px;
  }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--color-bg-grey);
    box-shadow: var(--shadow-lg);
  }

  .nav.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    padding: 100px 20px 60px;
  }

  .hero .container {
    flex-direction: column;
    text-align: center;
  }

  .hero-content {
    text-align: center;
    max-width: 100%;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-cta {
    justify-content: center;
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .hero-mockups img {
    width: 220px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 32px 24px;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .steps::before {
    display: none;
  }

  .step-number {
    width: 64px;
    height: 64px;
    font-size: 24px;
  }

  .pricing-card {
    padding: 40px 28px;
  }

  .pricing-price {
    font-size: 44px;
  }

  .section {
    padding: 80px 20px;
  }

  .section-header {
    margin-bottom: 48px;
  }

  .section-header p {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  .hero-badge {
    font-size: 13px;
    padding: 8px 16px;
  }

  .hero-mockups img {
    width: 200px;
  }

  .store-btn {
    padding: 12px 20px;
  }

  .store-btn-text span {
    font-size: 14px;
  }

  .legal-content h1 {
    font-size: 26px;
  }
}