/* ==========================================================================
   Unfold 웹사이트 — 공통 토큰과 컴포넌트
   색상은 docs/design-system.md의 승인된 네 가지 브랜드 팔레트를 그대로 사용한다.
   모서리·간격 토큰도 앱의 DesignSystem.cs 값을 따른다.
   ========================================================================== */

/* --- 1. 팔레트: 다정한 오트 (기본) --------------------------------------- */
:root,
[data-theme='oat'] {
  --canvas: #f5efe6;
  --shell: #faf6ef;
  --surface: #fffcf7;
  --raised: #f0e5d8;
  --text: #342d28;
  --muted: #706154;
  --accent: #985139;
  --accent-hover: #84432f;
  --on-accent: #ffffff;
  --secondary: #e9b894;
  --halo: #eddccc;
  --outline-subtle: #d8cbbe;
  --outline-strong: #9a8674;
  --warning: #7b560b;
  --error: #9e3f38;
  --success: #3f6850;
  --disabled-fill: #eae1d6;
  --disabled-text: #807365;
}

/* --- 2. 팔레트: 숨 고르는 숲 --------------------------------------------- */
[data-theme='sage'] {
  --canvas: #f0f2e8;
  --shell: #f7f8f0;
  --surface: #fcfcf6;
  --raised: #e7ecdd;
  --text: #263d32;
  --muted: #5d6c5f;
  --accent: #365d4c;
  --accent-hover: #294b3c;
  --on-accent: #ffffff;
  --secondary: #ceda9b;
  --halo: #e1e6cd;
  --outline-subtle: #cad1bf;
  --outline-strong: #7b8c76;
  --warning: #765912;
  --error: #9f3d3d;
  --success: #365d4c;
  --disabled-fill: #e3e8d9;
  --disabled-text: #73806e;
}

/* --- 3. 팔레트: 밤의 버터 (어두운 테마) ---------------------------------- */
[data-theme='midnight'] {
  --canvas: #172133;
  --shell: #1d293f;
  --surface: #243047;
  --raised: #2b3850;
  --text: #f0f1ed;
  --muted: #b5c0d0;
  --accent: #e8cf91;
  --accent-hover: #f0dbae;
  --on-accent: #263147;
  --secondary: #94acc5;
  --halo: #303e55;
  --outline-subtle: #46546b;
  --outline-strong: #8395ad;
  --warning: #ecd09a;
  --error: #ffb4ae;
  --success: #afd6be;
  --disabled-fill: #263248;
  --disabled-text: #91a0b7;
}

/* --- 4. 팔레트: 유연한 라일락 -------------------------------------------- */
[data-theme='plum'] {
  --canvas: #f1edf7;
  --shell: #f7f4fb;
  --surface: #fdfcff;
  --raised: #ece5f4;
  --text: #32283e;
  --muted: #70627f;
  --accent: #685187;
  --accent-hover: #574171;
  --on-accent: #ffffff;
  --secondary: #c8bae6;
  --halo: #e4daf1;
  --outline-subtle: #d5cade;
  --outline-strong: #9785aa;
  --warning: #785515;
  --error: #9e3c50;
  --success: #3c6956;
  --disabled-fill: #e8e1f0;
  --disabled-text: #82738f;
}

/* --- 5. 치수 토큰 (앱 DesignSystem.cs 기준) ------------------------------ */
:root {
  --radius-control: 12px;
  --radius-card: 24px;
  --radius-frame: 32px;

  --gap-xs: 6px;
  --gap-sm: 8px;
  --gap-md: 12px;
  --gap-lg: 20px;
  --gap-xl: 32px;
  --gap-2xl: 56px;
  --gap-3xl: 96px;

  --page-max: 1120px;
  --prose-max: 720px;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.06), 0 16px 40px rgba(0, 0, 0, 0.1);

  --ease: cubic-bezier(0.2, 0, 0.2, 1);
}

/* --- 6. 기본 --------------------------------------------------------------*/
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* 작성자 스타일의 display가 UA의 [hidden]을 덮어쓰지 않게 고정한다. */
[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background-color: var(--canvas);
  color: var(--text);
  font-family: 'Pretendard', 'Apple SD Gothic Neo', 'Noto Sans KR', -apple-system,
    BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

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

figure {
  margin: 0;
}

button, a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--gap-md);
  z-index: 100;
  padding: var(--gap-md) var(--gap-lg);
  background-color: var(--accent);
  color: var(--on-accent);
  border-radius: var(--radius-control);
  font-weight: 600;
}

.skip-link:focus {
  top: var(--gap-md);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* --- 7. 레이아웃 ----------------------------------------------------------*/
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gap-lg);
}

.section {
  padding: var(--gap-3xl) 0;
}

.section-tight {
  padding: var(--gap-2xl) 0;
}

.section-head {
  max-width: var(--prose-max);
  margin-bottom: var(--gap-xl);
}

.section-head.center {
  margin-right: auto;
  margin-left: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--gap-md);
  padding: var(--gap-xs) var(--gap-md);
  background-color: var(--halo);
  color: var(--accent);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.section-title {
  margin-bottom: var(--gap-md);
  font-size: clamp(26px, 4vw, 38px);
}

.section-desc {
  color: var(--muted);
  font-size: 17px;
}

/* --- 8. 헤더 --------------------------------------------------------------*/
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: color-mix(in srgb, var(--shell) 88%, transparent);
  border-bottom: 1px solid var(--outline-subtle);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  background-color: var(--accent);
  color: var(--on-accent);
  border-radius: 9px;
  font-size: 16px;
}

.site-nav {
  display: flex;
  gap: var(--gap-lg);
  margin-left: auto;
}

.site-nav .nav-account-link {
  display: none;
}

.brand, .header-actions, .site-nav a {
  flex-shrink: 0;
}

.site-nav a {
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.16s var(--ease);
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  background-color: transparent;
  color: var(--text);
  border: 1px solid var(--outline-subtle);
  border-radius: var(--radius-control);
  font-size: 18px;
  cursor: pointer;
}

/* --- 9. 버튼 --------------------------------------------------------------*/
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gap-sm);
  min-height: 44px;
  padding: 0 var(--gap-lg);
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.16s var(--ease), border-color 0.16s var(--ease),
    color 0.16s var(--ease);
}

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

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

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

.btn-secondary:hover {
  border-color: var(--outline-strong);
}

.btn-quiet {
  background-color: transparent;
  color: var(--text);
  border-color: var(--outline-subtle);
}

.btn-quiet:hover {
  border-color: var(--outline-strong);
}

.btn-lg {
  min-height: 52px;
  padding: 0 var(--gap-xl);
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  background-color: var(--disabled-fill);
  color: var(--disabled-text);
  border-color: var(--outline-subtle);
  cursor: not-allowed;
}

/* --- 10. 테마 선택기 ------------------------------------------------------*/
.theme-picker {
  display: flex;
  gap: var(--gap-xs);
  padding: var(--gap-xs);
  background-color: var(--raised);
  border-radius: 999px;
}

.theme-swatch {
  width: 26px;
  height: 26px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.16s var(--ease), border-color 0.16s var(--ease);
}

.theme-swatch:hover {
  transform: scale(1.12);
}

.theme-swatch[aria-pressed='true'] {
  border-color: var(--text);
}

.theme-swatch[data-value='oat'] {
  background: linear-gradient(135deg, #e9b894 50%, #985139 50%);
}

.theme-swatch[data-value='sage'] {
  background: linear-gradient(135deg, #ceda9b 50%, #365d4c 50%);
}

.theme-swatch[data-value='midnight'] {
  background: linear-gradient(135deg, #94acc5 50%, #e8cf91 50%);
}

.theme-swatch[data-value='plum'] {
  background: linear-gradient(135deg, #c8bae6 50%, #685187 50%);
}

/* --- 11. 카드 -------------------------------------------------------------*/
.card {
  padding: var(--gap-xl);
  background-color: var(--surface);
  border: 1px solid var(--outline-subtle);
  border-radius: var(--radius-card);
}

.card-title {
  margin-bottom: var(--gap-sm);
  font-size: 19px;
}

.card-desc {
  color: var(--muted);
  font-size: 15px;
}

.grid {
  display: grid;
  gap: var(--gap-lg);
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* --- 12. 안내 배너 --------------------------------------------------------*/
.notice {
  display: flex;
  gap: var(--gap-md);
  padding: var(--gap-lg);
  border: 1px solid var(--outline-subtle);
  border-left-width: 4px;
  border-radius: var(--radius-control);
  font-size: 15px;
}

.notice-warning {
  background-color: var(--halo);
  border-left-color: var(--warning);
}

.notice-info {
  background-color: var(--raised);
  border-left-color: var(--accent);
}

.notice-icon {
  flex-shrink: 0;
  font-size: 17px;
}

.notice strong {
  display: block;
  margin-bottom: 2px;
}

.notice p {
  color: var(--muted);
}

/* --- 13. 푸터 ------------------------------------------------------------ */
.site-footer {
  padding: var(--gap-2xl) 0 var(--gap-xl);
  background-color: var(--shell);
  border-top: 1px solid var(--outline-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--gap-xl);
  margin-bottom: var(--gap-xl);
}

.footer-desc {
  margin-top: var(--gap-md);
  max-width: 280px;
  color: var(--muted);
  font-size: 14px;
}

.footer-head {
  margin-bottom: var(--gap-md);
  font-size: 14px;
  font-weight: 600;
}

.footer-links li + li {
  margin-top: var(--gap-sm);
}

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

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

.footer-base {
  display: flex;
  justify-content: space-between;
  gap: var(--gap-md);
  padding-top: var(--gap-lg);
  border-top: 1px solid var(--outline-subtle);
  color: var(--muted);
  font-size: 13px;
}

/* --- 14. 반응형 -----------------------------------------------------------*/
@media (max-width: 900px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1050px) {
  .nav-toggle {
    display: block;
    order: 3;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 68px;
    right: 0;
    left: 0;
    flex-direction: column;
    gap: 0;
    padding: var(--gap-sm) var(--gap-lg) var(--gap-lg);
    background-color: var(--shell);
    border-bottom: 1px solid var(--outline-subtle);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: var(--gap-md) 0;
    font-size: 16px;
  }

  .site-nav .nav-account-link {
    display: block;
  }

  .header-actions {
    margin-left: auto;
  }

  .header-actions .btn {
    display: none;
  }
}

@media (max-width: 720px) {
  .section {
    padding: var(--gap-2xl) 0;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-base {
    flex-direction: column;
  }
}

@media (max-width: 420px) {
  .header-inner {
    gap: var(--gap-sm);
  }

  .header-actions {
    gap: var(--gap-xs);
  }

  .theme-picker {
    gap: 2px;
    padding: 4px;
  }

  .theme-swatch {
    width: 22px;
    height: 22px;
  }

  .card {
    padding: var(--gap-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

/* --- 15. 유틸리티 ---------------------------------------------------------*/
.section-alt {
  background-color: var(--shell);
}

.card-narrow {
  max-width: 760px;
  margin: 0 auto;
}

.stack-top {
  margin-top: var(--gap-lg);
}

.theme-dot-oat {
  background-color: #985139;
}

.theme-dot-sage {
  background-color: #365d4c;
}

.theme-dot-midnight {
  background-color: #e8cf91;
}

.theme-dot-plum {
  background-color: #685187;
}