/* ============================================================
   Design tokens — Starbucks-inspired
   ============================================================ */
:root {
  /* Greens (4-tier brand system) */
  --starbucks-green: #006241;
  --green-accent: #00754A;
  --house-green: #1E3932;
  --green-uplift: #2b5148;
  --green-light: #d4e9e2;

  /* Surface */
  --white: #ffffff;
  --neutral-cool: #f9f9f9;
  --neutral-warm: #f2f0eb;   /* page canvas */
  --ceramic: #edebe9;
  --black: #000000;

  /* Text */
  --text-black: rgba(0, 0, 0, 0.87);
  --text-black-soft: rgba(0, 0, 0, 0.58);
  --text-black-faint: rgba(0, 0, 0, 0.36);
  --text-white: rgba(255, 255, 255, 1);
  --text-white-soft: rgba(255, 255, 255, 0.70);

  /* Spacing (1rem = 10px) */
  --space-1: 0.4rem;
  --space-2: 0.8rem;
  --space-3: 1.6rem;
  --space-4: 2.4rem;
  --space-5: 3.2rem;
  --space-6: 4rem;
  --space-7: 4.8rem;
  --space-8: 5.6rem;
  --space-9: 6.4rem;

  /* Radii */
  --radius-card: 12px;
  --radius-pill: 50px;

  /* Shadows */
  --shadow-card: 0 0 0.5px rgba(0, 0, 0, 0.14), 0 1px 1px rgba(0, 0, 0, 0.24);
  --shadow-card-hover: 0 0 1px rgba(0, 0, 0, 0.18), 0 4px 12px rgba(0, 0, 0, 0.10);
  --shadow-nav: 0 1px 3px rgba(0, 0, 0, 0.1), 0 2px 2px rgba(0, 0, 0, 0.06), 0 0 2px rgba(0, 0, 0, 0.07);

  /* Typography */
  --font-sans: 'Inter', 'Helvetica Neue', Helvetica, Arial, 'Apple SD Gothic Neo',
               'Noto Sans KR', sans-serif;
  --font-serif: 'Lora', 'Iowan Old Style', Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Monaco, Consolas, monospace;

  --tracking-normal: -0.01em;
  --tracking-tight: -0.02em;
  --tracking-loose: 0.1em;

  --lh-compact: 1.2;
  --lh-normal: 1.5;
  --lh-loose: 1.75;

  /* Layout */
  --container-narrow: 720px;
  --container-default: 1080px;
  --container-wide: 1440px;
  --header-height: 64px;

  /* Motion */
  --ease-default: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration: 0.2s;
  --button-active-scale: 0.95;
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 62.5%;        /* 1rem = 10px (Starbucks anchor) */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.6rem;       /* 16px body */
  font-weight: 400;
  line-height: var(--lh-normal);
  letter-spacing: var(--tracking-normal);
  color: var(--text-black);
  background: var(--neutral-warm);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a { color: var(--green-accent); text-decoration: none; transition: color var(--duration) var(--ease-default); }
a:hover { color: var(--starbucks-green); text-decoration: underline; text-underline-offset: 3px; }

button { font: inherit; cursor: pointer; }

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-3);
}
.skip-link:focus {
  left: var(--space-3);
  z-index: 100;
  background: var(--starbucks-green);
  color: var(--white);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-pill);
}

/* ============================================================
   Layout
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-default);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}

@media (min-width: 768px) {
  .container { padding-left: var(--space-4); padding-right: var(--space-4); }
}
@media (min-width: 1024px) {
  .container { padding-left: var(--space-6); padding-right: var(--space-6); }
}

.main { min-height: 60vh; }

.section {
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
}
@media (min-width: 768px) {
  .section { padding-top: var(--space-9); padding-bottom: var(--space-9); }
}

.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.section__title {
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--text-black);
  letter-spacing: var(--tracking-normal);
  line-height: var(--lh-compact);
  margin: 0;
}
.section__caption {
  font-size: 1.4rem;
  color: var(--text-black-soft);
  margin: 0;
}

/* ============================================================
   Header / Site nav
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
  transition: background-color var(--duration) var(--ease-default),
              box-shadow var(--duration) var(--ease-default);
}

/* Stronger lift after the user scrolls past the page top */
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-nav);
}

/* Fallback for browsers without backdrop-filter */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .site-header { background: var(--white); box-shadow: var(--shadow-nav); }
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-height);
}
@media (min-width: 768px) { .site-header__inner { height: 72px; } }
@media (min-width: 1024px) { .site-header__inner { height: 83px; } }
@media (min-width: 1440px) { .site-header__inner { height: 99px; } }

.site-header__brand {
  flex-shrink: 0;
  color: var(--starbucks-green);
}
.site-header__brand:hover { color: var(--starbucks-green); text-decoration: none; }
.site-header__title {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: var(--tracking-normal);
}

/* Topic nav (scrollable horizontal on mobile) */
.topic-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.topic-nav::-webkit-scrollbar { display: none; }

.topic-nav__link {
  flex-shrink: 0;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text-black-soft);
  letter-spacing: var(--tracking-normal);
  transition: color var(--duration) var(--ease-default),
              background-color var(--duration) var(--ease-default);
}
.topic-nav__link:hover {
  color: var(--starbucks-green);
  background: var(--green-light);
  text-decoration: none;
}
.topic-nav__link.is-active {
  color: var(--starbucks-green);
  background: var(--green-light);
  font-weight: 600;
}

/* ============================================================
   Hero (home + topic)
   ============================================================ */
.hero {
  background: var(--neutral-warm);
  padding-top: var(--space-9);
  padding-bottom: var(--space-9);
  border-bottom: 1px solid var(--ceramic);
}
.hero__title {
  font-size: 3.6rem;
  font-weight: 600;
  color: var(--starbucks-green);
  line-height: var(--lh-compact);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-3);
}
@media (min-width: 768px) {
  .hero__title { font-size: 5rem; }
}
.hero__lead {
  font-size: 1.9rem;
  font-weight: 400;
  color: var(--text-black-soft);
  line-height: var(--lh-loose);
  letter-spacing: var(--tracking-normal);
  margin: 0;
  max-width: 60ch;
}

.topic-hero {
  position: relative;
  background: var(--ceramic);
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
}
.topic-hero__band {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: var(--topic-color, var(--green-accent));
}
.topic-hero__eyebrow {
  font-size: 1.3rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-loose);
  color: var(--topic-color, var(--green-accent));
  margin-bottom: var(--space-2);
}
.topic-hero__title {
  font-size: 3.2rem;
  font-weight: 600;
  color: var(--topic-color, var(--starbucks-green));
  line-height: var(--lh-compact);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-2);
}
.topic-hero__caption {
  font-size: 1.5rem;
  color: var(--text-black-soft);
  margin: 0;
}

/* ============================================================
   Post list / cards
   ============================================================ */
.post-list {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .post-list { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
}
@media (min-width: 1200px) {
  .post-list { grid-template-columns: repeat(3, 1fr); }
}

.post-card {
  background: var(--white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--duration) var(--ease-default),
              box-shadow var(--duration) var(--ease-default);
}
.post-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.post-card__link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.post-card__link:hover { text-decoration: none; color: inherit; }

/* Topic-colored top swatch */
.post-card__swatch {
  position: relative;
  height: 112px;
  background: var(--topic-color, var(--green-uplift));
  display: flex;
  align-items: flex-end;
  padding: var(--space-3) var(--space-4);
  transition: filter var(--duration) var(--ease-default);
}
.post-card:hover .post-card__swatch { filter: brightness(0.94); }

.post-card__swatch-label {
  font-size: 1.2rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  text-transform: lowercase;
  letter-spacing: var(--tracking-loose);
}

.post-card__body {
  padding: var(--space-4);
}

.post-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: 1.3rem;
  color: var(--text-black-soft);
}
.post-card__topic {
  font-weight: 600;
  color: var(--topic-color, var(--green-accent));
  text-transform: lowercase;
  letter-spacing: var(--tracking-loose);
}
.post-card__title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--text-black);
  line-height: var(--lh-compact);
  letter-spacing: var(--tracking-normal);
  margin: 0 0 var(--space-2);
}
.post-card:hover .post-card__title { color: var(--starbucks-green); }

.post-card__excerpt {
  font-size: 1.5rem;
  color: var(--text-black-soft);
  line-height: var(--lh-normal);
  margin: 0 0 var(--space-3);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

.tag {
  display: inline-block;
  padding: 2px var(--space-2);
  font-size: 1.2rem;
  font-weight: 500;
  border-radius: var(--radius-pill);
  background: var(--green-light);
  color: var(--starbucks-green);
  letter-spacing: var(--tracking-normal);
}

.empty-state {
  text-align: center;
  padding: var(--space-9) var(--space-3);
  color: var(--text-black-soft);
  font-size: 1.6rem;
}

/* ============================================================
   Post (article page)
   ============================================================ */
.post {
  position: relative;
  padding-top: var(--space-6);
  padding-bottom: var(--space-9);
}
.post__band {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--topic-color, var(--green-accent));
}

.post__container {
  max-width: var(--container-narrow);
}

.breadcrumb {
  font-size: 1.4rem;
  color: var(--text-black-soft);
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--green-accent); }
.breadcrumb a:hover { color: var(--starbucks-green); }
.breadcrumb__sep { color: var(--text-black-faint); }

.post__header {
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--ceramic);
}
.post__topic {
  font-size: 1.3rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-loose);
  color: var(--topic-color, var(--green-accent));
  margin-bottom: var(--space-3);
}
.post__title {
  font-size: 3.2rem;
  font-weight: 600;
  color: var(--topic-color, var(--starbucks-green));
  line-height: var(--lh-compact);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-3);
}
@media (min-width: 768px) {
  .post__title { font-size: 4rem; }
}
.post__date {
  font-size: 1.4rem;
  color: var(--text-black-soft);
}

/* ----- Body — typography for rendered markdown ----- */
.post__body {
  font-size: 1.7rem;
  line-height: var(--lh-loose);
  color: var(--text-black);
}

.post__body > * + * { margin-top: var(--space-4); }
.post__body h1, .post__body h2, .post__body h3, .post__body h4 {
  margin-top: var(--space-7);
  margin-bottom: var(--space-3);
  line-height: var(--lh-compact);
  letter-spacing: var(--tracking-normal);
  color: var(--text-black);
}
.post__body h1 { font-size: 2.8rem; font-weight: 600; color: var(--starbucks-green); }
.post__body h2 { font-size: 2.4rem; font-weight: 600; }
.post__body h3 { font-size: 2rem;   font-weight: 600; }
.post__body h4 { font-size: 1.7rem; font-weight: 600; }

.post__body p { margin: 0; }

.post__body a {
  color: var(--green-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.post__body a:hover { color: var(--starbucks-green); }

.post__body strong { font-weight: 600; color: var(--text-black); }
.post__body em { font-style: italic; }

.post__body ul, .post__body ol {
  margin: 0;
  padding-left: var(--space-5);
}
.post__body li + li { margin-top: var(--space-1); }

.post__body blockquote {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--green-accent);
  background: var(--neutral-warm);
  color: var(--text-black-soft);
  font-style: italic;
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
}
.post__body blockquote > * + * { margin-top: var(--space-2); }

.post__body hr {
  border: 0;
  height: 1px;
  background: var(--ceramic);
  margin: var(--space-7) 0;
}

.post__body code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  padding: 2px 6px;
  background: var(--neutral-cool);
  border-radius: 4px;
  color: var(--house-green);
}
.post__body pre {
  background: var(--house-green);
  color: var(--text-white);
  padding: var(--space-4);
  border-radius: var(--radius-card);
  overflow-x: auto;
  font-size: 1.4rem;
  line-height: 1.6;
}
.post__body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.post__body img {
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.post__body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1.5rem;
  background: var(--white);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.post__body th, .post__body td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--ceramic);
}
.post__body th {
  background: var(--neutral-warm);
  font-weight: 600;
  color: var(--text-black);
  letter-spacing: var(--tracking-normal);
}
.post__body tr:last-child td { border-bottom: 0; }

.post__tags {
  margin-top: var(--space-7);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.post__footer {
  margin-top: var(--space-9);
  padding-top: var(--space-5);
  border-top: 1px solid var(--ceramic);
}

/* ============================================================
   Buttons (50px pill, scale(0.95) active)
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 9px 20px;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: var(--tracking-normal);
  line-height: var(--lh-compact);
  border: 1px solid transparent;
  background: var(--green-accent);
  color: var(--white);
  text-decoration: none;
  transition: transform var(--duration) var(--ease-default),
              background-color var(--duration) var(--ease-default),
              color var(--duration) var(--ease-default),
              border-color var(--duration) var(--ease-default);
}
.btn:hover { background: var(--starbucks-green); color: var(--white); text-decoration: none; }
.btn:active { transform: scale(var(--button-active-scale)); }

.btn--outlined {
  background: transparent;
  color: var(--green-accent);
  border-color: var(--green-accent);
}
.btn--outlined:hover {
  background: var(--green-accent);
  color: var(--white);
}

/* ============================================================
   Footer (House Green band)
   ============================================================ */
.site-footer {
  background: var(--house-green);
  color: var(--text-white);
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
  margin-top: var(--space-9);
}
.site-footer__inner {
  text-align: center;
}
.site-footer__brand {
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: var(--tracking-normal);
  margin-bottom: var(--space-2);
}
.site-footer__desc {
  font-size: 1.4rem;
  color: var(--text-white-soft);
  margin: 0 0 var(--space-4);
  max-width: 50ch;
  margin-left: auto;
  margin-right: auto;
}
.site-footer__meta {
  font-size: 1.3rem;
  color: var(--text-white-soft);
  letter-spacing: var(--tracking-normal);
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  .site-header, .site-footer, .breadcrumb, .post__footer { display: none; }
  body { background: white; }
  .post__body { font-size: 12pt; line-height: 1.6; }
}