/* ============================================================
   calc.kr — 극도의 미니멀리즘 Glassmorphism 디자인 시스템
   ============================================================ */

@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css');

/* ── Design Tokens ── */
:root {
  --bg: #FFFFFF;
  --text: #222222;
  --text-sub: #888888;
  --text-light: #aaaaaa;
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --glass-blur: blur(14px);
  --btn-bg: rgba(200, 220, 255, 0.4);
  --btn-hover: rgba(180, 210, 255, 0.6);
  --btn-active: rgba(160, 195, 245, 0.7);
  --accent: rgba(100, 140, 255, 0.15);
  --accent-solid: #6488ff;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --max-w: 720px;
  --gap: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Subtle Background Pattern ── */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(200, 220, 255, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(200, 220, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* ── Header ── */
.calc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

.calc-header__logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.03em;
  transition: var(--transition);
}

.calc-header__logo:hover {
  opacity: 0.7;
}

.calc-header__nav {
  position: relative;
}

.calc-header__nav-btn {
  background: var(--btn-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xs);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}

.calc-header__nav-btn:hover {
  background: var(--btn-hover);
  transform: translateY(-1px);
}

.calc-nav-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
  padding: 12px;
  min-width: 260px;
  max-height: 400px;
  overflow-y: auto;
  z-index: 1000;
}

.calc-nav-dropdown.show {
  display: block;
  animation: fadeIn 0.2s ease;
}

.calc-nav-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  text-decoration: none;
  color: var(--text);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  transition: var(--transition);
}

.calc-nav-dropdown a:hover {
  background: var(--accent);
}

.calc-nav-dropdown__icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.calc-nav-dropdown__title {
  font-weight: 500;
}

/* ── Main Content ── */
.calc-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 8px 24px 40px;
  width: 100%;
}

/* ── Page Title ── */
.calc-page-title {
  text-align: center;
  margin-bottom: 8px;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.calc-page-desc {
  text-align: center;
  color: var(--text-sub);
  font-size: 0.95rem;
  margin-bottom: 28px;
  font-weight: 400;
}

/* ── Glassmorphism Card ── */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--glass-shadow);
  margin-bottom: 20px;
  transition: var(--transition);
}

.glass-card:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

.glass-card h3,
.glass-card h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text);
}

.glass-card h3 {
  font-size: 1.15rem;
}

.glass-card h4 {
  font-size: 1rem;
}

/* ── Buttons ── */
.calc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--btn-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
  width: 100%;
  gap: 8px;
}

.calc-btn:hover {
  background: var(--btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
}

.calc-btn:active {
  background: var(--btn-active);
  transform: scale(0.97);
  box-shadow: none;
}

.calc-btn--small {
  padding: 8px 16px;
  font-size: 0.85rem;
  width: auto;
  border-radius: var(--radius-xs);
}

.calc-btn--accent {
  background: rgba(100, 140, 255, 0.12);
  border-color: rgba(100, 140, 255, 0.15);
}

.calc-btn--accent:hover {
  background: rgba(100, 140, 255, 0.2);
}

.calc-btn--danger {
  background: rgba(255, 100, 100, 0.12);
  border-color: rgba(255, 100, 100, 0.15);
  color: #c44;
}

.calc-btn--danger:hover {
  background: rgba(255, 100, 100, 0.2);
}

/* ── Inputs ── */
.calc-input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  font-family: var(--font);
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  outline: none;
  transition: var(--transition);
  margin-bottom: 12px;
}

.calc-input:focus {
  border-color: rgba(100, 140, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(100, 140, 255, 0.1);
}

.calc-input::placeholder {
  color: var(--text-light);
}

.calc-label {
  display: block;
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--text);
}

/* ── Results ── */
.calc-result {
  margin-top: 16px;
  padding: 16px;
  background: rgba(100, 140, 255, 0.06);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
  min-height: 24px;
}

/* ── Tabs ── */
.calc-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  background: rgba(0, 0, 0, 0.03);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.calc-tab {
  flex: 1;
  padding: 12px 8px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-xs);
  transition: var(--transition);
  color: var(--text-sub);
  border: none;
  background: transparent;
  font-family: var(--font);
}

.calc-tab:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.5);
}

.calc-tab.active {
  background: white;
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  font-weight: 600;
}

/* ── Preset Buttons (groups of quick-select buttons) ── */
.calc-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 12px;
}

.calc-presets .calc-btn {
  flex: 1 1 calc(50% - 4px);
  padding: 10px 12px;
  font-size: 0.85rem;
  font-weight: 500;
  min-width: 0;
}

/* ── Table ── */
.calc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-top: 16px;
}

.calc-table th,
.calc-table td {
  padding: 10px 8px;
  text-align: center;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.calc-table th {
  font-weight: 600;
  color: var(--text-sub);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.calc-table tr:hover td {
  background: rgba(100, 140, 255, 0.04);
}

/* ── Related Calculators Section ── */
.calc-related {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.calc-related__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 12px;
}

.calc-related__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.calc-related__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
  transition: var(--transition);
  font-size: 0.88rem;
}

.calc-related__item:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

.calc-related__item-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
}

.calc-related__item-name {
  font-weight: 500;
}

/* ── Footer ── */
.calc-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: auto;
}

/* ── Ad containers - just spacing ── */
.calc-ad {
  margin: 20px 0;
}

/* ── Search Input (index page) ── */
.calc-search {
  display: flex;
  justify-content: center;
  margin-bottom: 28px;
}

.calc-search input {
  width: 100%;
  max-width: 420px;
  padding: 14px 20px;
  font-size: 0.95rem;
  font-family: var(--font);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 50px;
  outline: none;
  transition: var(--transition);
  color: var(--text);
}

.calc-search input:focus {
  border-color: rgba(100, 140, 255, 0.3);
  box-shadow: 0 0 0 4px rgba(100, 140, 255, 0.08);
}

.calc-search input::placeholder {
  color: var(--text-light);
}

/* ── Card Grid (index page) ── */
.calc-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.calc-card-wrapper {
  position: relative;
}

.calc-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

.calc-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

.calc-card.highlight {
  border-color: rgba(100, 140, 255, 0.3);
  background: rgba(200, 220, 255, 0.2);
}

.calc-card__icon {
  font-size: 1.8rem;
}

.calc-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.calc-card__desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.5;
}

.calc-card-label {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(255, 100, 100, 0.15);
  color: #c44;
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 20px;
  font-weight: 600;
}

/* ── Recently Used Section ── */
.calc-recent {
  margin-bottom: 28px;
}

.calc-recent__title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 10px;
}

.calc-recent__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.calc-recent__item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  text-decoration: none;
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
  transition: var(--transition);
}

.calc-recent__item:hover {
  background: var(--btn-hover);
  transform: translateY(-1px);
}

/* ── Info Snippet / Callout ── */
.calc-info {
  margin-top: 12px;
  padding: 14px 16px;
  background: rgba(255, 220, 100, 0.08);
  border-left: 3px solid rgba(255, 200, 0, 0.4);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  font-size: 0.88rem;
  color: var(--text);
}

/* ── Tip Guide List ── */
.calc-tip-list {
  margin-top: 12px;
  padding: 14px 16px 14px 32px;
  background: rgba(0, 0, 0, 0.02);
  border-radius: var(--radius-xs);
  font-size: 0.88rem;
  line-height: 1.8;
  list-style: disc;
}

/* ── Calculator specific: basic calc ── */
.calc-display {
  font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  background: rgba(0, 0, 0, 0.03);
  color: var(--text);
  font-size: 2rem;
  padding: 20px 16px;
  border-radius: var(--radius-sm);
  text-align: right;
  margin-bottom: 16px;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  word-break: break-all;
  font-weight: 300;
  letter-spacing: 0.02em;
}

.calc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.calc-buttons button {
  padding: 18px;
  font-size: 1.15rem;
  font-weight: 500;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  background: var(--btn-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}

.calc-buttons button:hover {
  background: var(--btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.calc-buttons button:active {
  background: var(--btn-active);
  transform: scale(0.97);
  box-shadow: none;
}

.calc-buttons .btn-clear {
  grid-column: span 4;
  background: rgba(255, 100, 100, 0.1);
  border-color: rgba(255, 100, 100, 0.12);
  color: #c44;
}

.calc-buttons .btn-clear:hover {
  background: rgba(255, 100, 100, 0.18);
}

/* ── Number grid (lotto etc.) ── */
.calc-numgrid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
  justify-content: center;
  margin: 16px 0;
}

.calc-numgrid .number {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-xs);
  cursor: pointer;
  user-select: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

.calc-numgrid .number:hover {
  background: var(--accent);
}

.calc-numgrid .number.selected {
  background: var(--text);
  color: white;
  border-color: var(--text);
}

/* ── Calendar ── */
.calc-calendar {
  border-collapse: collapse;
  width: 100%;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--glass-shadow);
}

.calc-calendar th,
.calc-calendar td {
  padding: 10px;
  text-align: center;
  border: 1px solid rgba(0, 0, 0, 0.04);
  font-size: 0.88rem;
}

.calc-calendar th {
  background: rgba(0, 0, 0, 0.02);
  font-weight: 600;
  color: var(--text-sub);
}

.calc-calendar td.today {
  background: var(--text);
  color: white;
  font-weight: 600;
  border-radius: 0;
}

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .calc-header {
    padding: 14px 16px;
  }

  .calc-main {
    padding: 8px 16px 32px;
  }

  .glass-card {
    padding: 20px;
  }

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

  .calc-related__grid {
    grid-template-columns: 1fr;
  }

  .calc-buttons {
    gap: 10px;
  }

  .calc-buttons button {
    padding: 16px;
  }

  .calc-numgrid {
    grid-template-columns: repeat(9, 1fr);
    gap: 4px;
  }

  .calc-numgrid .number {
    font-size: 0.78rem;
  }

  .calc-presets .calc-btn {
    flex: 1 1 100%;
  }
}

@media (max-width: 480px) {
  .calc-page-title {
    font-size: 1.3rem;
  }

  .calc-display {
    font-size: 1.6rem;
    padding: 16px 12px;
  }

  .calc-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* ── Share Button ── */
.calc-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--btn-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
}

.calc-share-btn:hover {
  background: var(--btn-hover);
  transform: translateY(-1px);
}

/* ── Utility ── */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }