/*
 * Navigation home V3
 * Apple-inspired page rhythm: 44px global navigation, one-focus hero,
 * full-width color sections, product-shelf shortcuts, and practical scanning.
 */
:root {
  --nav-page: #f5f5f7;
  --nav-card: #ffffff;
  --nav-ink: #1d1d1f;
  --nav-secondary: #6e6e73;
  --nav-tertiary: #86868b;
  --nav-line: rgba(0, 0, 0, .08);
  --nav-blue: #0071e3;
  --nav-blue-hover: #0077ed;
  --nav-card-shadow: 0 2px 8px rgba(0,0,0,.035), 0 18px 46px rgba(0,0,0,.055);
}

[data-theme="dark"] {
  --nav-page: #000;
  --nav-card: #1c1c1e;
  --nav-ink: #f5f5f7;
  --nav-secondary: #a1a1a6;
  --nav-tertiary: #86868b;
  --nav-line: rgba(255,255,255,.12);
  --nav-blue: #2997ff;
  --nav-blue-hover: #409cff;
  --nav-card-shadow: 0 2px 8px rgba(0,0,0,.22), 0 22px 58px rgba(0,0,0,.32);
}

html { background: var(--nav-page); scroll-padding-top: 44px; }
body { min-height: 100vh; background: var(--nav-page) !important; color: var(--nav-ink); }

/* Wallpaper belongs to the hero only, rather than sitting behind every card. */
#bing-bg, #bing-bg-overlay {
  position: absolute !important;
  inset: 0 0 auto !important;
  width: 100%;
  height: max(720px, 100svh) !important;
}
#bing-bg {
  z-index: 0 !important;
  background-position: center 46% !important;
  filter: saturate(.92) contrast(1.03) brightness(.92) !important;
}
#bing-bg-overlay {
  z-index: 1 !important;
  background:
    linear-gradient(180deg, rgba(0,0,0,.20) 0%, rgba(0,0,0,.04) 35%, rgba(0,0,0,.14) 75%, rgba(0,0,0,.46) 100%) !important;
}
[data-theme="dark"] #bing-bg-overlay {
  background: linear-gradient(180deg, rgba(0,0,0,.38), rgba(0,0,0,.12) 38%, rgba(0,0,0,.58)) !important;
}

/* Apple global-navigation proportions with practical anchors. */
.top-bar {
  position: absolute !important;
  inset: 0 0 auto !important;
  z-index: 50 !important;
  width: 100%;
  height: 44px;
  display: grid !important;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 28px !important;
  padding: 0 24px !important;
  background: rgba(255,255,255,.74) !important;
  border: 0 !important;
  border-bottom: 1px solid rgba(255,255,255,.22) !important;
  box-shadow: none !important;
  backdrop-filter: saturate(180%) blur(22px) !important;
  -webkit-backdrop-filter: saturate(180%) blur(22px) !important;
}
[data-theme="dark"] .top-bar { background: rgba(20,20,22,.70) !important; border-bottom-color: rgba(255,255,255,.09) !important; }
.site-brand { display: inline-flex; align-items: center; gap: 10px; width: fit-content; color: var(--nav-ink); text-decoration: none; }
.site-brand-mark { position: relative; display: grid; width: 28px; height: 28px; flex: 0 0 auto; place-items: center; border-radius: 9px; box-shadow: 0 4px 13px rgba(0,113,227,.22),inset 0 0 0 1px rgba(255,255,255,.24); transition: transform 240ms cubic-bezier(.16,1,.3,1),box-shadow 240ms ease; }
.site-brand-mark::after { content:""; position:absolute; inset:-4px; z-index:-1; border-radius:12px; background:linear-gradient(135deg,rgba(100,210,255,.30),rgba(0,113,227,.08)); filter:blur(7px); opacity:0; transition:opacity 220ms ease; }
.site-brand-mark svg { display:block; width:28px; height:28px; overflow:visible; }
.site-brand:hover .site-brand-mark { transform: translateY(-1px) rotate(-3deg) scale(1.04); box-shadow:0 7px 18px rgba(0,113,227,.28),inset 0 0 0 1px rgba(255,255,255,.28); }
.site-brand:hover .site-brand-mark::after { opacity:1; }
.site-brand-name { font-size: 12px; font-weight: 650; letter-spacing:-.015em; white-space: nowrap; }
.site-links { display: flex; align-items: center; justify-content: center; gap: 34px; }
.site-links a { color: var(--nav-ink); font-size: 12px; text-decoration: none; opacity: .78; transition: opacity 160ms ease; }
.site-links a:hover { opacity: 1; }
.top-actions { display: flex; align-items: center; justify-content: flex-end; gap: 8px; }
.user-menu-wrap { position: relative; }
.top-bar .user-btn, .top-bar .theme-toggle {
  min-height: 30px !important;
  height: 30px !important;
  background: transparent !important;
  border: 0 !important;
  border-radius: 9px !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
}
.top-bar .user-btn { padding: 2px 8px 2px 3px !important; }
.top-bar .user-avatar { width: 24px !important; height: 24px !important; font-size: 11px !important; }
.top-bar .theme-toggle { width: 30px !important; padding: 0 !important; }
.top-bar .theme-toggle-knob { width: 24px !important; height: 24px !important; transform: none !important; font-size: 13px !important; background: rgba(127,127,127,.13) !important; }
.top-bar .user-btn:hover, .top-bar .theme-toggle:hover { background: rgba(127,127,127,.12) !important; }

main { position: relative; z-index: 2; }
.hero-stage {
  position: relative;
  min-height: max(720px, 100svh);
  display: grid;
  place-items: center;
  overflow: hidden;
  color: #fff;
}
.hero-inner {
  width: min(820px, calc(100% - 36px));
  margin-top: -12px;
  text-align: center;
}
.clock { padding: 0 !important; margin: 0 !important; }
.clock-time {
  font-size: clamp(92px, 11vw, 152px) !important;
  font-weight: 600 !important;
  line-height: .84 !important;
  letter-spacing: -.075em !important;
  color: #fff !important;
  text-shadow: 0 4px 30px rgba(0,0,0,.24) !important;
}
.clock-sec { font-size: .22em !important; margin-left: 13px !important; opacity: .62 !important; letter-spacing: -.02em !important; }
.clock-date { margin-top: 19px !important; color: rgba(255,255,255,.92) !important; font-size: 15px !important; font-weight: 600 !important; text-shadow: 0 2px 14px rgba(0,0,0,.30); }
.hitokoto {
  min-height: 22px;
  margin: 24px auto 26px !important;
  color: rgba(255,255,255,.88) !important;
  font-size: 14px !important;
  font-weight: 500;
  text-shadow: 0 2px 14px rgba(0,0,0,.38);
}
.search-wrap { width: 100%; max-width: 760px !important; margin: 0 auto !important; }
.search-box {
  min-height: 58px !important;
  padding: 6px !important;
  border: 1px solid rgba(255,255,255,.58) !important;
  border-radius: 18px !important;
  background: rgba(255,255,255,.88) !important;
  box-shadow: 0 16px 44px rgba(0,0,0,.18), inset 0 1px rgba(255,255,255,.42) !important;
  backdrop-filter: saturate(180%) blur(28px) !important;
  -webkit-backdrop-filter: saturate(180%) blur(28px) !important;
}
[data-theme="dark"] .search-box { background: rgba(28,28,30,.86) !important; border-color: rgba(255,255,255,.18) !important; }
.engine-btn { min-height: 46px !important; padding: 0 14px !important; color: var(--nav-secondary) !important; border-radius: 13px !important; }
.search-input { color: var(--nav-ink) !important; font-size: 17px !important; }
.search-input::placeholder { color: var(--nav-tertiary) !important; }
.search-submit { min-height: 46px !important; padding: 0 23px !important; border-radius: 13px !important; background: var(--nav-blue) !important; box-shadow: none !important; }
.search-submit:hover { background: var(--nav-blue-hover) !important; }
.engine-option { appearance: none; border: 0; padding: 0; }
.top-bar button:active, .search-box button:active, .btn:active, .ai-link:active, .shortcut:active { transform: scale(.96) !important; transition-duration: 80ms !important; }
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: rgba(255,255,255,.76);
  font-size: 11px;
  text-decoration: none;
  transform: translateX(-50%);
}
.scroll-cue svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.5; animation: navCue 1.8s ease-in-out infinite; }
@keyframes navCue { 0%,100%{transform:translateY(0);opacity:.55} 50%{transform:translateY(4px);opacity:1} }

/* Solid content section: stronger readability and less decorative glass. */
.dashboard-stage { position: relative; z-index: 3; background: var(--nav-page); padding: 104px 0 48px; }
.dashboard-inner { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.section-intro { max-width: 780px; margin-bottom: 54px; }
.section-eyebrow { margin: 0 0 15px !important; color: var(--nav-blue) !important; font-size: 12px !important; font-weight: 700; letter-spacing: .12em; }
.section-intro h1 { margin: 0; color: var(--nav-ink); font-size: clamp(48px, 6vw, 76px); font-weight: 650; line-height: 1.02; letter-spacing: -.055em; }
.section-intro h1 span { color: var(--nav-secondary); }
.section-intro > p:last-child { margin: 34px 0 0; color: var(--nav-secondary); font-size: 18px; line-height: 1.5; }

.ai-row {
  display: grid !important;
  grid-template-columns: repeat(12, minmax(0,1fr)) !important;
  gap: 20px !important;
}
.ai-row > .card, .shortcuts-wrap {
  overflow: hidden;
  background: var(--nav-card) !important;
  border: 0 !important;
  border-radius: 30px !important;
  box-shadow: var(--nav-card-shadow) !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}
.ai-row > .card:hover, .shortcuts-wrap:hover { transform: none !important; box-shadow: var(--nav-card-shadow) !important; }
.countdown-card { grid-column: span 4; min-height: 300px; }
.ai-card { grid-column: span 8; min-height: 300px; }
.exam-card { grid-column: 1 / -1; min-height: 260px; }
.shortcuts-header, .shortcuts-body, .exam-sidebar-header {
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
}
.shortcuts-header, .exam-sidebar-header {
  min-height: 70px;
  padding: 26px 28px 12px !important;
  color: var(--nav-ink) !important;
  font-size: 14px !important;
  font-weight: 650 !important;
}
.shortcuts-header-left svg, .exam-sidebar-header svg { color: var(--nav-blue) !important; stroke-width: 1.7 !important; }
.shortcuts-body { padding: 12px 28px 28px !important; }

.countdown-card .shortcuts-body { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.countdown-box, #countdown-box-holiday {
  min-height: 190px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin: 0 !important;
  padding: 20px 14px !important;
  border-radius: 22px !important;
  background: var(--nav-page) !important;
  text-align: center;
}
.countdown-box-num { color: var(--nav-ink) !important; font-size: 56px !important; font-weight: 650 !important; letter-spacing: -.06em !important; }
.countdown-box-label, .countdown-box-date, .countdown-box-unit { color: var(--nav-secondary) !important; }
.countdown-accent-line { display: none !important; }

.ai-card .shortcuts-body { display: flex; align-items: center; min-height: 220px; padding-top: 4px !important; }
.ai-card .shortcuts { width: 100%; display: grid !important; grid-template-columns: repeat(5, minmax(62px,1fr)); gap: 22px 10px !important; justify-content: stretch !important; }
.ai-card .shortcut { width: auto !important; min-width: 0; }
.shortcut-icon, .shortcut-icon > div, .shortcut-icon img { width: 58px !important; height: 58px !important; border-radius: 17px !important; }
.shortcut-icon { background: var(--nav-page) !important; border: 0 !important; box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 6px 18px rgba(0,0,0,.08) !important; }
.shortcut-icon img { padding: 8px !important; background: #fff !important; object-fit: contain !important; }
.shortcut-icon .shortcut-letter-card {
  display: grid !important;
  width: 58px !important;
  height: 58px !important;
  place-items: center;
  border-radius: 17px !important;
  background:
    radial-gradient(circle at 28% 20%,rgba(255,255,255,.34),transparent 34%),
    linear-gradient(145deg,color-mix(in srgb,var(--shortcut-color) 72%,#fff),var(--shortcut-color) 58%,color-mix(in srgb,var(--shortcut-color) 78%,#000)) !important;
  color: #fff !important;
  font-size: 22px !important;
  font-weight: 750 !important;
  text-shadow: 0 1px 3px rgba(0,0,0,.22);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.38);
}
.shortcut-name { max-width: 100%; color: var(--nav-ink) !important; font-size: 12px !important; text-shadow: none !important; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.shortcut:hover .shortcut-icon { transform: translateY(-4px) scale(1.025) !important; box-shadow: 0 12px 28px rgba(0,0,0,.13) !important; }

.exam-list { display: grid !important; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 0; padding: 4px 22px 28px !important; }
.exam-item {
  min-height: 82px;
  margin: 0 !important;
  padding: 15px 16px !important;
  border: 0 !important;
  border-top: 1px solid var(--nav-line) !important;
  border-radius: 0 !important;
  background: transparent !important;
}
.exam-item:nth-child(-n+3) { border-top: 0 !important; }
.exam-item-left { min-width: 0; }
.exam-item-name { color: var(--nav-ink) !important; font-size: 13px !important; }
.exam-item-meta { color: var(--nav-tertiary) !important; }
.exam-item-days { flex: 0 0 auto; }

.shortcuts-wrap { scroll-margin-top: 64px; margin-top: 28px !important; min-height: 260px; }
.shortcuts-wrap .shortcuts-header { min-height: 78px; padding-bottom: 10px !important; }
.shortcuts-wrap .shortcuts-body { padding-top: 14px !important; }
.shortcuts-wrap .shortcuts { justify-content: flex-start !important; gap: 30px 20px !important; }
.shortcuts-wrap .shortcut { width: 82px !important; }
.shortcut-category { flex-basis: 100%; margin: 18px 0 0 !important; color: var(--nav-tertiary) !important; font-size: 11px !important; font-weight: 700; letter-spacing: .08em; }
.batch-setting { color: var(--nav-secondary) !important; background: var(--nav-page) !important; border: 0 !important; }
.footer { padding: 52px 0 0 !important; color: var(--nav-tertiary) !important; text-shadow: none !important; }

/* Existing dialogs remain functional but visually join the new page. */
.modal-overlay { z-index: 100 !important; background: rgba(0,0,0,.34) !important; backdrop-filter: blur(18px); }
.modal { border: 0 !important; border-radius: 24px !important; background: var(--nav-card) !important; box-shadow: 0 26px 80px rgba(0,0,0,.24) !important; }
.dropdown { border: 1px solid var(--nav-line) !important; border-radius: 14px !important; background: color-mix(in srgb,var(--nav-card) 92%,transparent) !important; box-shadow: 0 18px 46px rgba(0,0,0,.18) !important; backdrop-filter: blur(24px); }

@media (max-width: 900px) {
  .top-bar { grid-template-columns: 1fr auto; }
  .site-links { display: none; }
  .hero-inner { margin-top: -4px; }
  .countdown-card { grid-column: span 5; }
  .ai-card { grid-column: span 7; }
  .ai-card .shortcuts { grid-template-columns: repeat(3,1fr); }
  .exam-list { grid-template-columns: repeat(2,1fr); }
  .exam-item:nth-child(3) { border-top: 1px solid var(--nav-line) !important; }
}

@media (max-width: 640px) {
  #bing-bg, #bing-bg-overlay, .hero-stage { height: max(680px, 100svh) !important; min-height: max(680px, 100svh) !important; }
  .top-bar { padding-inline: 12px !important; }
  .site-brand-name, .user-chevron { display: none; }
  .user-btn { max-width: 112px; }
  .hero-inner { width: calc(100% - 24px); }
  .clock-time { font-size: clamp(76px, 25vw, 112px) !important; }
  .clock-date { margin-top: 15px !important; font-size: 13px !important; }
  .hitokoto { min-height: 40px; margin: 20px auto !important; padding: 0 18px; font-size: 12.5px !important; }
  .search-box { min-height: 54px !important; border-radius: 17px !important; }
  .engine-btn { min-width: 48px; padding: 0 10px !important; }
  #engine-label { display: none !important; }
  .search-submit {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    flex: 0 0 46px;
    width: 46px;
    padding: 0 !important;
    font-size: 0 !important;
  }
  .search-submit::after { content: "→"; font-size: 20px; font-weight: 600; line-height: 1; }
  .search-input { font-size: 15px !important; }
  .scroll-cue { bottom: 16px; }
  .dashboard-stage { padding: 72px 0 34px; }
  .dashboard-inner { width: calc(100% - 24px); }
  .section-intro { margin-bottom: 38px; }
  .section-intro h1 { font-size: 48px; }
  .section-intro > p:last-child { margin-top: 26px; font-size: 15px; }
  .ai-row { display: flex !important; flex-direction: column; gap: 14px !important; }
  .ai-row > .card, .shortcuts-wrap { min-height: 0; border-radius: 24px !important; }
  .shortcuts-header, .exam-sidebar-header { min-height: 62px; padding: 22px 20px 10px !important; }
  .shortcuts-body { padding: 10px 20px 22px !important; }
  .countdown-box, #countdown-box-holiday { min-height: 150px; }
  .countdown-box-num { font-size: 46px !important; }
  .ai-card .shortcuts-body { min-height: 0; }
  .ai-card .shortcuts { grid-template-columns: repeat(3,1fr); gap: 20px 8px !important; }
  .exam-list { grid-template-columns: 1fr; padding: 4px 14px 22px !important; }
  .exam-item { border-top: 1px solid var(--nav-line) !important; }
  .exam-item:first-child { border-top: 0 !important; }
  .shortcuts-wrap .shortcuts { justify-content: space-between !important; gap: 24px 10px !important; }
  .shortcuts-wrap .shortcut { width: 72px !important; }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-cue svg { animation: none; }
}