/* Shared toast notifications (top-right, non-blocking). */
html {
  overflow-y: scroll;
}

.site-skip-link {
  position: fixed;
  left: 1rem;
  top: 0.75rem;
  z-index: 70;
  padding: 0.65rem 0.95rem;
  border-radius: 9999px;
  background: #0c6780;
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform 180ms ease, opacity 180ms ease;
  opacity: 0;
}

.site-skip-link:focus,
.site-skip-link:focus-visible {
  transform: translateY(0);
  opacity: 1;
}

:focus-visible {
  outline: 2px solid #0c6780;
  outline-offset: 2px;
}

.site-nav-mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 5.25rem;
  z-index: 51;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.84) 0%, rgba(255, 255, 255, 0.66) 100%);
  -webkit-backdrop-filter: blur(20px) saturate(1.14);
  backdrop-filter: blur(20px) saturate(1.14);
  transition: opacity 180ms ease;
}

html.dark .site-nav-mask {
  background: linear-gradient(180deg, rgba(10, 18, 32, 0.9) 0%, rgba(10, 18, 32, 0.72) 100%);
}

/* Announcement bar — 胶囊样式固定在 banner 顶部 */
.site-announcement-bar {
  position: absolute;
  top: 5.75rem;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  justify-content: center;
  padding: 0.45rem 1rem;
  pointer-events: none;
}

.site-announcement-bar-inner {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 1.2rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: #1e4b5e;
  background: rgba(224, 242, 254, 0.88);
  border: 1px solid rgba(14, 116, 144, 0.18);
  box-shadow: 0 2px 10px rgba(14, 116, 144, 0.08);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  pointer-events: auto;
}

html.dark .site-announcement-bar-inner {
  color: #b9e6f7;
  background: rgba(12, 43, 58, 0.88);
  border-color: rgba(100, 180, 210, 0.2);
  box-shadow: 0 2px 10px rgba(2, 6, 23, 0.3);
}

.site-shared-nav {
  background: rgba(255, 255, 255, 0.76) !important;
  border-bottom: 1px solid rgba(186, 212, 227, 0.48);
  -webkit-backdrop-filter: blur(22px) saturate(1.16);
  backdrop-filter: blur(22px) saturate(1.16);
  box-shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
}

html.dark .site-shared-nav {
  background: rgba(10, 18, 32, 0.72) !important;
  border-bottom-color: rgba(82, 109, 143, 0.38);
  -webkit-backdrop-filter: blur(22px) saturate(1.18);
  backdrop-filter: blur(22px) saturate(1.18);
  box-shadow: 0 8px 26px rgba(2, 6, 23, 0.28);
}

.site-shared-desktop-links a,
.site-shared-mobile-links a {
  letter-spacing: 0.045em;
  line-height: 1.2;
}

.site-mobile-nav-trigger {
  width: 2.25rem;
  height: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: rgba(255, 255, 255, 0.72);
  color: #0f4c76;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform 160ms ease, background-color 180ms ease, color 180ms ease;
}

.site-mobile-nav-trigger:active {
  transform: scale(0.95);
}

.site-avatar-trigger {
  width: 2.25rem;
  height: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: rgba(255, 255, 255, 0.72);
  color: #0f4c76;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform 160ms ease, background-color 180ms ease, color 180ms ease;
}

.site-avatar-trigger:active {
  transform: scale(0.95);
}

html.dark .site-mobile-nav-trigger {
  background: rgba(15, 23, 42, 0.72);
  border-color: rgba(148, 163, 184, 0.34);
  color: #9dcfe8;
}

html.dark .site-avatar-trigger {
  background: rgba(15, 23, 42, 0.72);
  border-color: rgba(148, 163, 184, 0.34);
  color: #9dcfe8;
}

.site-mobile-nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 58;
  opacity: 0;
  pointer-events: none;
  background: rgba(7, 14, 27, 0.34);
  transition: opacity 220ms ease;
}

.site-mobile-nav-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.site-mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  height: 100dvh;
  width: min(82vw, 320px);
  z-index: 59;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
  transform: translateX(100%);
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
  background: rgba(255, 255, 255, 0.9);
  border-left: 1px solid rgba(148, 163, 184, 0.24);
  box-shadow: -12px 0 28px rgba(15, 23, 42, 0.12);
  -webkit-backdrop-filter: blur(18px) saturate(1.12);
  backdrop-filter: blur(18px) saturate(1.12);
}

.site-mobile-nav-drawer.is-open {
  transform: translateX(0);
}

html.dark .site-mobile-nav-drawer {
  background: rgba(10, 18, 32, 0.9);
  border-left-color: rgba(82, 109, 143, 0.38);
  box-shadow: -14px 0 34px rgba(2, 6, 23, 0.4);
}

.site-mobile-nav-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.25rem 0.25rem 0.5rem;
  border-bottom: 1px solid rgba(148, 163, 184, 0.22);
}

html.dark .site-mobile-nav-head {
  border-bottom-color: rgba(82, 109, 143, 0.4);
}

.site-mobile-nav-title {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #64748b;
  font-weight: 600;
}

html.dark .site-mobile-nav-title {
  color: #a4bad5;
}

.site-mobile-nav-close {
  width: 2rem;
  height: 2rem;
  border-radius: 9999px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  color: #0f4c76;
  background: rgba(255, 255, 255, 0.68);
}

html.dark .site-mobile-nav-close {
  border-color: rgba(148, 163, 184, 0.34);
  color: #9dcfe8;
  background: rgba(15, 23, 42, 0.72);
}

.site-mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.site-mobile-nav-item {
  display: flex;
  align-items: center;
  gap: 0.72rem;
  border-radius: 0.85rem;
  padding: 0.72rem 0.8rem;
  color: #3f4b5e;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  transition: background-color 180ms ease, color 180ms ease;
}

.site-mobile-nav-item .material-symbols-outlined {
  font-size: 1.15rem;
  color: #0f6a95;
}

.site-mobile-nav-item:hover {
  background: rgba(14, 116, 144, 0.08);
  color: #0f4c76;
}

.site-mobile-nav-item.is-active {
  background: rgba(14, 116, 144, 0.14);
  color: #0f4c76;
  font-weight: 600;
}

html.dark .site-mobile-nav-item {
  color: #b9c8dd;
}

html.dark .site-mobile-nav-item .material-symbols-outlined {
  color: #9dcfe8;
}

html.dark .site-mobile-nav-item:hover {
  background: rgba(56, 189, 248, 0.12);
  color: #e4f2ff;
}

html.dark .site-mobile-nav-item.is-active {
  background: rgba(56, 189, 248, 0.18);
  color: #f2f8ff;
}

html.site-mobile-nav-open,
body.site-mobile-nav-open {
  overflow: hidden;
}

@media (min-width: 768px) {
  .site-mobile-nav-trigger,
  .site-mobile-nav-drawer,
  .site-mobile-nav-overlay {
    display: none !important;
  }
}

.site-page-transition-enabled .site-nav-mask,
.site-page-transition-exiting .site-nav-mask {
  opacity: 1;
}

.site-page-transition-ready .site-nav-mask {
  opacity: 0;
}

.site-page-transition-enabled main,
.site-page-transition-enabled [data-site-footer] {
  opacity: 0;
}

.site-page-transition-entering main,
.site-page-transition-ready main {
  transition: opacity 280ms ease;
}

.site-page-transition-entering [data-site-footer],
.site-page-transition-ready [data-site-footer] {
  transition: opacity 360ms cubic-bezier(0.22, 1, 0.36, 1) 60ms;
}

.site-page-transition-ready main,
.site-page-transition-ready [data-site-footer] {
  opacity: 1;
}

.site-page-transition-exiting main {
  transition: opacity 220ms ease-out;
  opacity: 0;
}

.site-page-transition-exiting [data-site-footer] {
  transition: opacity 260ms ease-out 40ms;
  opacity: 0;
}

/* ── Page Loader Progress Bar ── */
.site-page-loader {
  position: fixed;
  top: 5.25rem;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 49;
  pointer-events: none;
  overflow: hidden;
  opacity: 0;
  transition: opacity 180ms ease;
}
.site-page-loader.is-active {
  opacity: 1;
}
.site-page-loader::after {
  content: '';
  display: block;
  height: 100%;
  width: 0;
  border-radius: 0 2px 2px 0;
  background: linear-gradient(90deg, #0c6780, #38bdf8, #0ea5e9, #0c6780);
  background-size: 200% 100%;
  transition: width 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.site-page-loader.is-active::after {
  width: 60%;
  animation: siteLoaderSlide 0.9s ease-in-out infinite;
}
.site-page-loader.is-complete::after {
  width: 100%;
  animation: none;
  background: #0c6780;
  transition: width 0.15s ease-out;
}
@keyframes siteLoaderSlide {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.site-toast-container {
  position: fixed;
  top: 5.25rem;
  right: 1rem;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  pointer-events: none;
}

.site-toast {
  max-width: min(24rem, calc(100vw - 2rem));
  padding: 0.75rem 1rem;
  border-radius: 0.875rem;
  border: 1px solid rgba(191, 200, 205, 0.6);
  background: rgba(255, 255, 255, 0.9);
  color: #1f2937;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.42s ease, transform 0.42s ease;
}

.site-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  flex-shrink: 0;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: rgba(255, 255, 255, 0.85);
  color: #0f4c76;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 180ms ease;
}

.site-theme-toggle-wrap {
  width: 100%;
  display: flex;
  justify-content: flex-end;
}

@media (min-width: 768px) {
  .site-theme-toggle-wrap {
    width: auto;
  }
}

.site-theme-toggle:active {
  transform: scale(0.96);
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.12);
}

.site-theme-toggle-icon {
  display: none;
  font-size: 0.95rem;
}

.site-theme-toggle[data-theme="light"] [data-theme-icon="dark"],
.site-theme-toggle[data-theme="dark"] [data-theme-icon="light"] {
  display: inline-flex;
}

html.dark .site-theme-toggle {
  background: rgba(15, 23, 42, 0.78);
  border-color: rgba(148, 163, 184, 0.38);
  color: #9dcfe8;
  box-shadow: 0 10px 20px rgba(2, 6, 23, 0.35);
}

.site-toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

html.dark body {
  background-color: #0b1320;
  color: #e2e8f0;
}

html.dark .site-toast {
  border-color: rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.9);
  color: #e7edf7;
  box-shadow: 0 12px 28px rgba(2, 6, 23, 0.5);
}

html.dark textarea,
html.dark input[type="text"],
html.dark input[type="search"],
html.dark input[type="email"],
html.dark input[type="password"] {
  background: rgba(30, 41, 59, 0.9) !important;
  color: #e7edf7 !important;
  border: 1px solid rgba(148, 163, 184, 0.3) !important;
}

html.dark textarea::placeholder,
html.dark input::placeholder {
  color: #9eb0c7 !important;
  opacity: 1;
}

html.dark textarea:focus,
html.dark input:focus {
  box-shadow: 0 0 0 2px rgba(137, 208, 237, 0.35) !important;
  border-color: rgba(137, 208, 237, 0.6) !important;
}

/* Dark-mode typography contrast tuning across all pages. */
html.dark .text-on-surface {
  color: #e7edf7 !important;
}

html.dark [class*="text-on-surface-variant"] {
  color: #b6c4d9 !important;
}

html.dark .text-primary,
html.dark .text-primary-fixed-variant {
  color: #8fd4ee !important;
}

html.dark .text-secondary {
  color: #a8d7dd !important;
}

html.dark .text-tertiary {
  color: #f2cfa7 !important;
}

html.dark .text-slate-900,
html.dark .text-slate-800,
html.dark .text-slate-700,
html.dark .text-slate-600,
html.dark .text-slate-500,
html.dark .text-slate-400,
html.dark .text-outline,
html.dark .text-outline-variant {
  color: #b7c4d7 !important;
}

html.dark .placeholder\:text-outline::placeholder {
  color: #8ea0ba !important;
  opacity: 1;
}

html.dark .glass-card,
html.dark .glass-panel,
html.dark .polaroid-frame {
  background: rgba(15, 23, 42, 0.62) !important;
  border-color: rgba(148, 163, 184, 0.28) !important;
  box-shadow: 0 8px 24px rgba(2, 6, 23, 0.35) !important;
}

/* Gallery hero text contrast in dark mode. */
html.dark .glass-header {
  background: rgba(10, 18, 32, 0.76) !important;
  border-color: rgba(148, 163, 184, 0.34) !important;
}

html.dark .glass-header h1 {
  color: #ecf3ff !important;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

html.dark .glass-header p {
  color: #c5d3e7 !important;
}

html.dark .bg-ethereal {
  background:
    radial-gradient(circle at 20% 30%, rgba(12, 103, 128, 0.26) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(135, 206, 235, 0.2) 0%, transparent 40%),
    #0b1320 !important;
}

html.dark .bg-dreamy-gradient {
  background: linear-gradient(135deg, #0b1320 0%, #122338 50%, #163a58 100%) !important;
}

html.dark .floating-blob {
  opacity: 0.25;
}

/* Prevent masonry card hover from repainting sibling cards (Safari/columns flicker). */
.note-card {
  transition-property: transform, box-shadow !important;
  will-change: transform;
  backface-visibility: hidden;
  transform: translateZ(0);
  contain: paint;
}

.note-card:hover {
  position: relative;
  z-index: 1;
}

/* Classmates card quote text visibility in dark mode */
html.dark .classmate-quote {
  background: rgba(30, 41, 59, 0.7) !important;
  color: #e0eaff !important;
  border-left: 3px solid rgba(137, 208, 237, 0.5);
}

html.dark .classmate-quote:hover {
  background: rgba(30, 41, 59, 0.85) !important;
  border-left-color: rgba(137, 208, 237, 0.8);
}

@media (prefers-reduced-motion: reduce) {
  .site-nav-mask,
  .site-page-transition-enabled main,
  .site-page-transition-enabled [data-site-footer],
  .site-page-transition-entering main,
  .site-page-transition-entering [data-site-footer],
  .site-page-transition-ready main,
  .site-page-transition-ready [data-site-footer],
  .site-page-transition-exiting main,
  .site-page-transition-exiting [data-site-footer],
  .site-toast,
  .classmate-quote {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}

/* Light mode quote styling */
.classmate-quote {
  background: rgba(227, 237, 245, 0.6) !important;
  color: #1f2937 !important;
  border-left: 3px solid rgba(12, 103, 128, 0.4);
  transition: all 0.3s ease;
}

.classmate-quote:hover {
  background: rgba(227, 237, 245, 0.9) !important;
  border-left-color: rgba(12, 103, 128, 0.7);
}

/* Footer reminder banner */
.site-footer-banner {
  width: 100%;
  background-color: #f1f5f9;
  color: #475569;
  font-size: 0.875rem;
  padding: 0.625rem 1rem;
  border-radius: 2rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.5rem;
  border: 1px solid #e2e8f0;
}

html.dark .site-footer-banner {
  background-color: rgba(30, 41, 59, 0.5);
  color: #94a3b8;
  border-color: rgba(51, 65, 85, 0.6);
}