/* THE NOOK Seoul - Airbnb Style Design System (Enhanced) */

/* ========================================
   CSS Variables (Design Tokens)
   ======================================== */
:root {
  /* Primary Colors - 메인 브랜드 색상 */
  --color-primary-green: #448361;
  --color-primary-green-light: #5a9d7a;
  --color-primary-green-dark: #356b4d;

  /* Accent Colors - 액센트 색상 (stay.enko.kr 영감) */
  --color-accent-gold: #F8E585;
  --color-accent-gold-light: #FFF4C4;
  --color-accent-gold-dark: #E6D060;

  /* Neutral Colors - 중립 색상 */
  --color-white: #FFFFFF;
  --color-off-white: #FAF8F3;
  --color-gray-50: #F7F7F7;
  --color-gray-100: #F0F0F0;
  --color-gray-200: #E0E0E0;
  --color-gray-300: #CCCCCC;
  --color-gray-400: #999999;
  --color-gray-500: #717171;
  --color-gray-600: #484848;
  --color-gray-700: #333333;
  --color-gray-800: #222222;
  --color-black: #000000;

  /* Brown Tones - 브라운 톤 */
  --color-brown-light: #B8A789;
  --color-brown: #6c5439;
  --color-brown-dark: #3e3c1f;

  /* Semantic Colors - 의미론적 색상 */
  --color-success: #448361;
  --color-error: #C13515;
  --color-warning: #F8E585;
  --color-info: #4A90E2;

  /* Background Colors */
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #FAF8F3;
  --color-bg-tertiary: #F0F8F4;
  --color-bg-gold: #FFF9F0;

  /* Border Colors */
  --color-border-light: #E0EDE7;
  --color-border: #E0E0E0;
  --color-border-dark: #CCCCCC;
  --color-border-green: #448361;
  --color-border-gold: #FFE4B5;

  /* Text Colors (Semantic) */
  --color-text-primary: #222222;
  --color-text-secondary: #717171;
  --color-text-tertiary: #484848;
  --color-text-light: #B0B0B0;

  /* Typography - 타이포그래피 */
  --font-primary: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --font-secondary: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Roboto Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Font Sizes */
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-md: 1.0625rem;    /* 17px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 1.75;
  --line-height-body: 1.6;
  --line-height-heading: 1.2;

  /* Spacing - 8px 기반 */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-7: 1.75rem;   /* 28px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */

  /* Container */
  --container-max-width: 1280px;
  --container-padding-desktop: 2rem;    /* 32px */
  --container-padding-tablet: 1.5rem;   /* 24px */
  --container-padding-mobile: 1rem;     /* 16px */

  /* Grid */
  --grid-gap: 1.5rem;  /* 24px */

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 6px 16px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.15);
  --shadow-2xl: 0 12px 32px rgba(0, 0, 0, 0.18);
  --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

/* ========================================
   Typography
   ======================================== */
h1 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.625rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text-primary);
  margin-bottom: 0.375rem;
}

p {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text-primary);
}

.text-small {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

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

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--container-padding-mobile);
  }
}

/* ========================================
   Grid System
   ======================================== */
.grid {
  display: grid;
  gap: var(--grid-gap);
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Navigation - Airbnb Style
   ======================================== */
.navbar {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.5rem 0;
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar__logo {
  max-height: 32px;
}

@media (max-width: 768px) {
  .navbar {
    padding: 1rem 0;
  }

  .navbar__logo {
    max-height: 28px;
  }
}

/* ========================================
   Footer
   ======================================== */
.footer {
  text-align: center;
  padding: 3rem 0;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-top: 4rem;
  border-top: 1px solid var(--color-border-light);
}

/* ========================================
   Images
   ======================================== */
img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ========================================
   Property Card - Airbnb Style
   ======================================== */
.property-card {
  background-color: transparent;
  overflow: visible;
  transition: transform 0.15s ease;
  text-decoration: none;
  color: inherit;
  display: block;
  cursor: pointer;
}

.property-card:hover .property-card__image {
  transform: scale(1.02);
}

.property-card:hover {
  transform: translateY(-2px);
}

.property-card__image-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: var(--radius-medium);
  margin-bottom: 12px;
}

.property-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background-color: var(--color-bg-secondary);
  transition: transform 0.2s ease;
}

.property-card__body {
  padding: 0;
}

.property-card__location {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  font-weight: 400;
}

.property-card__title {
  font-size: 0.9375rem;
  font-weight: 400;
  margin-bottom: 8px;
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.property-card__price {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-nook-green); /* THE NOOK 브랜드 컬러로 가격 강조 */
  margin-bottom: 0.5rem;
}

.property-card__price-label {
  font-weight: 400;
  color: var(--color-text-secondary);
}

.property-card__amenities {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.amenity-tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  border-radius: var(--radius-small);
  font-weight: 400;
}

/* ========================================
   Buttons - Airbnb Style
   ======================================== */
.btn-primary {
  display: inline-block;
  padding: 0.875rem 1.5rem;
  background-color: var(--color-nook-green); /* THE NOOK 브랜드 컬러 */
  color: var(--color-bg-primary);
  font-weight: 600;
  font-size: 1rem;
  text-align: center;
  border: none;
  border-radius: var(--radius-small);
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn-primary:hover {
  background-color: #356b4e; /* 더 어두운 그린 */
  transform: scale(1.02);
}

.btn-secondary {
  display: inline-block;
  padding: 0.875rem 1.5rem;
  background-color: transparent;
  color: var(--color-text-primary);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--color-text-primary);
  border-radius: var(--radius-small);
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
}

/* ========================================
   Language Switcher
   ======================================== */
.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
  cursor: pointer;
}

.language-switcher:hover {
  box-shadow: var(--shadow-medium);
  border-color: var(--color-text-primary);
}

/* ========================================
   Sections
   ======================================== */
.section {
  margin-bottom: 3rem;
}

.section__header {
  margin-bottom: 1.5rem;
}

.section__title {
  font-size: 1.625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.section__description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .section {
    margin-bottom: 2rem;
  }

  .section__title {
    font-size: 1.375rem;
  }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding: 3rem 0;
  text-align: center;
}

.hero__title {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .hero {
    padding: 2rem 0;
  }

  .hero__title {
    font-size: 1.875rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }
}

/* ========================================
   Animations
   ======================================== */
a, button, .property-card {
  transition: all 0.15s ease;
}

/* ========================================
   Accessibility
   ======================================== */
a:focus, button:focus {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.pt-1 { padding-top: 0.5rem; }
.pt-2 { padding-top: 1rem; }
.pt-3 { padding-top: 1.5rem; }
.pt-4 { padding-top: 2rem; }

.pb-1 { padding-bottom: 0.5rem; }
.pb-2 { padding-bottom: 1rem; }
.pb-3 { padding-bottom: 1.5rem; }
.pb-4 { padding-bottom: 2rem; }


/* ========================================
   Phase 8 & 9: Performance & Accessibility
   ======================================== */

/* Font Loading Optimization */
@font-face {
  font-family: 'Pretendard Variable';
  font-display: swap;
}

/* Focus Indicators (WCAG 2.1 AA Compliant) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-primary-green);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Skip to main content (accessibility) */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-primary-green);
  color: white;
  padding: var(--spacing-2) var(--spacing-4);
  z-index: 9999;
}

.skip-to-main:focus {
  top: 0;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}