/* =========================================================
   Daily AI News — 미니멀 (데스크탑 Hero+Grid / 모바일 Linear)
   ========================================================= */

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #ececec;
  --border-strong: #d8d8d8;
  --text: #0f0f0f;
  --text-2: #404040;
  --text-3: #6b6b6b;
  --text-4: #9a9a9a;
  --accent: #0f0f0f;
  --accent-soft: #f4f4f4;

  --src-hn: #ff6600;
  --src-gh: #24292f;
  --src-gn: #2563eb;
  --src-an: #d97757;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
  --maxw: 1240px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
               "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", Roboto, sans-serif;
  font-feature-settings: "tnum", "ss01";
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ---------- 상단 미니바 ---------- */
.topbar {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.topbar-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 12px 24px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: var(--text-3);
}
.topbar .brand-mini { font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.topbar .brand-mini::before {
  content: ""; display: inline-block;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); margin-right: 8px; vertical-align: middle;
}
.topbar .last-updated { font-variant-numeric: tabular-nums; }

/* ---------- 헤더 ---------- */
header.page-header {
  max-width: var(--maxw); margin: 0 auto;
  padding: 56px 24px 32px;
}
.brand {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.05;
  color: var(--text);
}
.subtitle {
  margin-top: 12px;
  font-size: 16px;
  color: var(--text-3);
  letter-spacing: -0.005em;
}
.header-bottom {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: flex-end;
}

/* ====== 날짜 네비 (드롭다운 + 캘린더) ====== */
.nav-c { display: inline-flex; align-items: center; gap: 6px; position: relative; }
.nav-c .today-link {
  margin-right: 6px;
  padding: 0 14px; height: 36px;
  border: 0; background: transparent;
  border-radius: 99px;
  font-size: 13px; color: var(--text-3); font-weight: 500;
  cursor: pointer; font-family: inherit;
  transition: background 0.12s, color 0.12s;
  display: inline-flex; align-items: center; justify-content: center;
}
.nav-c .today-link:hover { background: var(--accent-soft); color: var(--text); }
.nav-c .arrow {
  width: 36px; height: 36px;
  border: 1px solid var(--border); background: var(--surface);
  border-radius: 50%;
  cursor: pointer; color: var(--text-3); font-size: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.nav-c .arrow:hover {
  background: var(--accent-soft); color: var(--text);
  border-color: var(--border-strong);
}
.nav-c .arrow.disabled {
  cursor: default; opacity: 0.35; pointer-events: none;
}
.nav-c .date-pill {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 16px;
  border: 0; background: transparent;
  border-radius: 99px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s;
  margin: 0 4px;
}
.nav-c .date-pill:hover { background: var(--accent-soft); }
.nav-c .date-pill .date-text {
  font-size: 18px; font-weight: 700; letter-spacing: -0.015em;
  color: var(--text); font-variant-numeric: tabular-nums;
}
.nav-c .date-pill .day-text {
  font-size: 13px; color: var(--text-3); font-weight: 500;
}
.nav-c .date-pill .caret {
  color: var(--text-3); font-size: 10px;
  transition: transform 0.18s;
}
.nav-c .date-pill.open .caret { transform: rotate(180deg); }

.nav-c .calendar-pop {
  position: absolute; top: calc(100% + 12px); right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.12);
  padding: 16px;
  width: 280px;
  display: none;
  z-index: 50;
}
.nav-c.open .calendar-pop { display: block; }
.nav-c .cal-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 10px;
}
.nav-c .cal-head .month-title {
  font-size: 14px; font-weight: 700; letter-spacing: -0.01em;
}
.nav-c .cal-head button {
  width: 26px; height: 26px; border: 0; background: transparent;
  border-radius: 6px; cursor: pointer; color: var(--text-3); font-size: 14px;
}
.nav-c .cal-head button:hover { background: var(--accent-soft); color: var(--text); }
.nav-c .cal-head button:disabled { opacity: 0.3; cursor: default; }
.nav-c .cal-grid {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px;
}
.nav-c .cal-grid .dow {
  font-size: 10px; color: var(--text-4); text-align: center;
  padding: 4px 0; font-weight: 600; letter-spacing: 0.05em;
}
.nav-c .cal-grid .day {
  aspect-ratio: 1; display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 12px; color: var(--text-2);
  border-radius: 6px;
  font-variant-numeric: tabular-nums;
  transition: background 0.1s;
  position: relative;
  text-decoration: none;
}
.nav-c .cal-grid a.day { cursor: pointer; }
.nav-c .cal-grid a.day:hover { background: var(--accent-soft); }
.nav-c .cal-grid .day.has-data::after {
  content: ""; position: absolute; bottom: 3px;
  width: 3px; height: 3px; border-radius: 50%; background: var(--text-3);
}
.nav-c .cal-grid .day.active {
  background: var(--accent); color: var(--bg); font-weight: 700;
}
.nav-c .cal-grid .day.active::after { background: var(--bg); opacity: 0.7; }
.nav-c .cal-grid .day.muted { color: var(--text-4); opacity: 0.4; cursor: default; }
.nav-c .cal-grid span.day { cursor: default; }

/* ---------- 메인 컨테이너 ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 32px 24px 64px; }

.empty-state {
  padding: 80px 24px; text-align: center; color: var(--text-3);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

/* ---------- 카드 공통 ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--src-color, transparent);
}
.card.src-hn { --src-color: var(--src-hn); }
.card.src-gh { --src-color: var(--src-gh); }
.card.src-gn { --src-color: var(--src-gn); }
.card.src-an { --src-color: var(--src-an); }

.card-header {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-size: 12px; color: var(--text-3);
}
.source-name {
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-2);
}
.card.src-hn .source-name { color: var(--src-hn); }
.card.src-gh .source-name { color: var(--src-gh); }
.card.src-gn .source-name { color: var(--src-gn); }
.card.src-an .source-name { color: var(--src-an); }

.card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.015em;
  color: var(--text);
  word-break: keep-all;
}
.card .summary {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
  word-break: keep-all;
  white-space: pre-line;
}
.card .application {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.6;
  padding: 12px 14px;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  word-break: keep-all;
}
.card .application::before {
  content: "활용";
  display: inline-block;
  font-size: 10px; font-weight: 700; letter-spacing: 0.08em;
  color: var(--text-3);
  text-transform: uppercase;
  margin-right: 8px;
  padding: 2px 6px;
  background: var(--surface);
  border-radius: 3px;
  vertical-align: 2px;
}

.card-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; align-items: center;
}
.read-more {
  font-size: 13px; font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px;
  background: var(--accent);
  color: var(--bg);
  border-radius: var(--radius-sm);
  transition: background 0.15s, transform 0.1s;
  min-height: 36px;
}
.read-more:hover { background: #2a2a2a; }
.read-more:active { transform: scale(0.98); }
.read-more::after { content: "→"; font-weight: 400; }

/* ---------- Hero 카드 ---------- */
.card.hero {
  padding: 32px;
  min-height: 320px;
}
.card.hero h3 {
  font-size: 26px;
  line-height: 1.3;
  letter-spacing: -0.025em;
}
.card.hero .summary { font-size: 15px; }

/* ---------- 데스크탑: Hero + Grid ---------- */
.hero-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
  margin-bottom: 18px;
}
.grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}

@media (max-width: 1024px) {
  .hero-row { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .card.hero { min-height: 0; padding: 28px; }
  .card.hero h3 { font-size: 22px; }
}

/* ---------- 모바일 ---------- */
@media (max-width: 768px) {
  main { padding: 20px 16px 48px; max-width: 720px; }
  header.page-header { padding: 32px 16px 20px; }
  .topbar-inner { padding: 10px 16px; }
  .header-bottom { justify-content: stretch; }

  .nav-c { width: 100%; justify-content: space-between; }
  .nav-c .date-pill { flex: 1; justify-content: center; }
  .nav-c .calendar-pop { left: 0; right: 0; width: auto; }

  .hero-row, .grid {
    display: flex; flex-direction: column; gap: 12px;
    grid-template-columns: none;
  }
  .hero-row { margin-bottom: 12px; }

  .card { padding: 18px; gap: 12px; border-radius: var(--radius); }
  .card.hero { padding: 22px; min-height: 0; }
  .card.hero h3 { font-size: 19px; }
  .card h3 { font-size: 16px; }
  .card .summary { font-size: 14px; }
  .card .application { font-size: 13px; padding: 11px 12px; }

  .brand { font-size: 32px; }
  .subtitle { font-size: 14px; }

  .read-more { padding: 10px 16px; min-height: 44px; }
  .nav-c .arrow, .nav-c .today-link { height: 44px; }
  .nav-c .arrow { width: 44px; }
}

@media (max-width: 360px) {
  .brand { font-size: 28px; }
  main { padding: 16px 12px 40px; }
  .card { padding: 16px; }
}

/* ---------- 푸터 ---------- */
footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.footer-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 28px 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 13px; color: var(--text-3);
}
.footer-inner a { color: var(--text-2); font-weight: 500; }
.footer-inner a:hover { color: var(--text); }
@media (max-width: 768px) {
  .footer-inner { padding: 20px 16px; flex-direction: column; }
}

/* 접근성 */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}