/* ==========================================================================
   Graduation Website Premium Style System
   Theme: Dreamy Twilight & Frosted Glass (暖色暮光与微光磨砂玻璃)
   ========================================================================== */

/* Custom Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Noto+Serif+SC:wght@500;700;900&family=Ma+Shan+Zheng&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Color System - Light Mode Default */
  --bg-main: #F8F9FD;
  --bg-card-default: #FFFFFF;
  --color-dark: #1E293B; /* Softer dark charcoal */
  --color-muted: #64748B;
  
  /* Premium Solid Accents (for buttons, icons, borders, active states) */
  --brand-purple: #6366F1;
  --brand-purple-hover: #4F46E5;
  --brand-orange: #F97316;
  --brand-yellow: #F59E0B;
  --brand-blue: #3B82F6;
  --brand-pink: #EC4899;
  --brand-green: #10B981;

  /* Pastels for glass cards (subtle, soft) */
  --pastel-yellow: #FEF9E7;
  --pastel-pink: #FCE7F3;
  --pastel-blue: #E0F2FE;
  --pastel-purple: #F3E8FF;
  --pastel-green: #E6F4EA;

  /* Borders and Shadows (High-end styling) */
  --border-width: 1px;
  --border-main: var(--border-width) solid rgba(30, 41, 59, 0.08);
  --border-glass: var(--border-width) solid rgba(255, 255, 255, 0.5);
  
  --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.04), 0 1px 3px -1px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 12px 20px -8px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
  
  /* Fonts */
  --font-main: 'Plus Jakarta Sans', 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-title: 'Noto Serif SC', serif;
  --font-handwriting: 'Ma Shan Zheng', cursive, serif;

  /* Theme Mesh Gradients - Light */
  --mesh-grad-1: rgba(224, 242, 254, 0.4);
  --mesh-grad-2: rgba(243, 232, 255, 0.4);
  --mesh-grad-3: rgba(254, 243, 199, 0.2);
  --mesh-grad-4: rgba(252, 231, 243, 0.2);

  /* Element Backgrounds */
  --header-bg: rgba(255, 255, 255, 0.7);
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-hover-bg: rgba(255, 255, 255, 0.95);
  --input-bg: rgba(255, 255, 255, 0.6);
  --input-focus-bg: #FFFFFF;
  --text-primary: #1E293B;
  --text-secondary: #475569;
}

[data-theme="dark"] {
  --bg-main: #0B0F19;
  --bg-card-default: #1E293B;
  --color-dark: #F1F5F9;
  --color-muted: #94A3B8;
  
  --brand-purple: #818CF8;
  --brand-purple-hover: #6366F1;
  --brand-orange: #FB923C;
  --brand-yellow: #FBBF24;
  --brand-blue: #60A5FA;
  --brand-pink: #F472B6;
  --brand-green: #34D399;

  --pastel-yellow: #2D2A1E;
  --pastel-pink: #2F1E29;
  --pastel-blue: #1E293B;
  --pastel-purple: #2A1E3B;
  --pastel-green: #1E2F24;

  --border-main: var(--border-width) solid rgba(255, 255, 255, 0.08);
  --border-glass: var(--border-width) solid rgba(255, 255, 255, 0.1);
  
  --shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 12px 20px -8px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

  --mesh-grad-1: rgba(15, 23, 42, 0.7);
  --mesh-grad-2: rgba(88, 28, 135, 0.35);
  --mesh-grad-3: rgba(124, 45, 18, 0.25);
  --mesh-grad-4: rgba(13, 148, 136, 0.25);

  --header-bg: rgba(15, 23, 42, 0.7);
  --card-bg: rgba(30, 41, 59, 0.7);
  --card-hover-bg: rgba(30, 41, 59, 0.95);
  --input-bg: rgba(15, 23, 42, 0.6);
  --input-focus-bg: #1E293B;
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background-color: rgba(148, 163, 184, 0.3);
  border: 3px solid var(--bg-main);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
  background-color: rgba(148, 163, 184, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(at 0% 0%, var(--mesh-grad-1) 0px, transparent 50%),
    radial-gradient(at 100% 0%, var(--mesh-grad-2) 0px, transparent 50%),
    radial-gradient(at 100% 100%, var(--mesh-grad-3) 0px, transparent 50%),
    radial-gradient(at 0% 100%, var(--mesh-grad-4) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--color-dark);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  padding-bottom: 0;
  transition: background-color 0.5s ease, background-image 0.5s ease, color 0.3s ease;
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
header {
  background-color: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.2);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

header.scrolled {
  background-color: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 0;
  margin-top: 12px;
  border-radius: 99px;
  max-width: 1160px;
  margin-left: auto;
  margin-right: auto;
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(30, 41, 59, 0.05);
  border-bottom: none;
}

[data-theme="dark"] header.scrolled {
  background-color: rgba(15, 23, 42, 0.7);
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
  transition: all 0.3s;
}

header.scrolled .header-container {
  padding: 0 16px;
}

.logo {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: 900;
  text-decoration: none;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: transform 0.2s ease, color 0.3s ease;
}

.logo:hover {
  transform: scale(1.02);
}

nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
}

/* Premium Buttons & Navigation Links */
nav a, .btn {
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--color-muted);
  background-color: rgba(255, 255, 255, 0.8);
  padding: 8px 20px;
  border: 1px solid rgba(226, 232, 240, 0.8);
  border-radius: 99px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

[data-theme="dark"] nav a, [data-theme="dark"] .btn {
  background-color: rgba(30, 41, 59, 0.8);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--color-muted);
}

nav a:hover, .btn:hover {
  color: var(--color-dark);
  background-color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(30, 41, 59, 0.15);
}

[data-theme="dark"] nav a:hover, [data-theme="dark"] .btn:hover {
  background-color: #1E293B;
  color: var(--color-dark);
  border-color: rgba(255, 255, 255, 0.15);
}

nav a.active {
  background: linear-gradient(135deg, var(--brand-purple), #8B5CF6);
  color: #FFFFFF !important;
  border: none;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
}

nav a.active:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
}

/* Primary Button Modifier */
.btn-primary {
  background: linear-gradient(135deg, var(--brand-purple), #8B5CF6) !important;
  color: #FFFFFF !important;
  border: none !important;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25) !important;
}

.btn-primary:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35) !important;
  color: #FFFFFF !important;
}

.btn-danger {
  background-color: #FEF2F2 !important;
  color: #EF4444 !important;
  border: 1px solid rgba(239, 68, 68, 0.15) !important;
  box-shadow: var(--shadow-sm) !important;
}

[data-theme="dark"] .btn-danger {
  background-color: rgba(239, 68, 68, 0.1) !important;
  color: #F87171 !important;
  border-color: rgba(239, 68, 68, 0.2) !important;
}

.btn-danger:hover {
  background-color: #EF4444 !important;
  color: #FFFFFF !important;
  border-color: transparent !important;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.2) !important;
}

/* Theme Toggle Button Style */
.btn-theme {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(226, 232, 240, 0.8);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--color-dark);
  outline: none;
}

[data-theme="dark"] .btn-theme {
  background: rgba(30, 41, 59, 0.8);
  border-color: rgba(255, 255, 255, 0.08);
  color: #F1F5F9;
}

.btn-theme:hover {
  transform: scale(1.08) translateY(-2px);
  background-color: #FFFFFF;
  box-shadow: var(--shadow-md);
  border-color: rgba(30, 41, 59, 0.15);
}

[data-theme="dark"] .btn-theme:hover {
  background-color: #1E293B;
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-theme svg {
  width: 1.3em;
  height: 1.3em;
  transition: transform 0.5s ease;
}

.btn-theme:hover svg {
  transform: rotate(30deg);
}

/* ==========================================================================
   Hero Section & Live Screen
   ========================================================================== */
.hero-section {
  padding: 40px 0 60px 0;
  text-align: center;
  position: relative;
}

.hero-banner {
  background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 35%, #312E81 70%, #1E1B4B 100%);
  border: none;
  box-shadow: var(--shadow-lg), 0 10px 40px rgba(0, 0, 0, 0.15);
  border-radius: 32px;
  padding: 60px 40px;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

/* Decorative Background Glows inside Hero Banner */
.hero-banner::before {
  content: '';
  position: absolute;
  top: -20%;
  left: -10%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.hero-banner::after {
  content: '';
  position: absolute;
  bottom: -20%;
  right: -10%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-title {
  font-family: var(--font-title);
  font-size: 3.8rem;
  font-weight: 900;
  margin-bottom: 12px;
  letter-spacing: 4px;
  background: linear-gradient(135deg, #FFFFFF, #E0E7FF, #FCE7F3);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: none;
}

.hero-subtitle {
  font-family: var(--font-handwriting);
  font-size: 2.2rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 30px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Transparent Glass Danmaku Screen */
.danmaku-screen {
  height: 200px;
  background-color: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  margin: 20px 0;
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.4), 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Digital Grid Line Pattern overlay */
.danmaku-screen::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.danmaku-item {
  position: absolute;
  white-space: nowrap;
  color: #FFFFFF;
  font-weight: 600;
  font-size: 1rem;
  padding: 8px 18px;
  border-radius: 99px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
  animation: moveDanmaku 12s linear forwards;
  pointer-events: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

@keyframes moveDanmaku {
  from { left: 100%; transform: translateX(0); }
  to { left: -100%; transform: translateX(-100%); }
}

/* ==========================================================================
   Section Header & Titles
   ========================================================================== */
.section-header {
  margin: 70px 0 35px 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 1px solid rgba(30, 41, 59, 0.06);
  padding-bottom: 16px;
}

.section-header span {
  font-size: 0.95rem;
  font-weight: 500 !important;
  color: var(--color-muted);
}

.section-title {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 900;
  background: none;
  color: var(--color-dark);
  border: none;
  padding: 0;
  transform: none;
  display: inline-block;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 45px;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-purple), var(--brand-pink));
  border-radius: 2px;
}

/* ==========================================================================
   Students Cards Grid (同学录)
   ========================================================================== */
.students-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.student-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

/* Reset target custom child backgrounds from original code */
.student-card:nth-child(even),
.student-card:nth-child(odd) {
  background: rgba(255, 255, 255, 0.7);
}

.student-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg), 0 4px 15px rgba(99, 102, 241, 0.05);
  border-color: rgba(99, 102, 241, 0.2);
}

.student-avatar-container {
  height: 240px;
  border-bottom: 1px solid rgba(30, 41, 59, 0.04);
  background-color: #F1F5F9;
  position: relative;
  overflow: hidden;
}

.student-avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.student-card:hover .student-avatar {
  transform: scale(1.08);
}

.student-info {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 12px;
}

.student-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 2px;
}

.student-quote {
  font-family: var(--font-handwriting);
  font-size: 1.4rem;
  color: #475569;
  margin-bottom: 4px;
  flex-grow: 1;
  border-left: 2px solid rgba(99, 102, 241, 0.3);
  padding-left: 12px;
  line-height: 1.4;
}

.student-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--brand-purple);
  background-color: #EEF2FF;
  border: 1px solid rgba(99, 102, 241, 0.12);
  padding: 4px 10px;
  border-radius: 99px;
}

/* Subtle variation on tag colors based on item sequence */
.student-card:nth-child(2n) .tag {
  color: var(--brand-green);
  background-color: #ECFDF5;
  border-color: rgba(16, 185, 129, 0.12);
}
.student-card:nth-child(3n) .tag {
  color: var(--brand-pink);
  background-color: #FDF2F8;
  border-color: rgba(236, 72, 153, 0.12);
}
.student-card:nth-child(4n) .tag {
  color: var(--brand-blue);
  background-color: #EFF6FF;
  border-color: rgba(59, 130, 246, 0.12);
}

.student-card .btn-sm {
  margin-top: auto;
  align-self: flex-start;
  padding: 6px 16px;
  font-size: 0.85rem;
  border-radius: 99px;
  background-color: rgba(241, 245, 249, 0.8);
  color: var(--color-muted);
  border: 1px solid rgba(226, 232, 240, 0.8);
  box-shadow: none;
}

.student-card:hover .btn-sm {
  background: linear-gradient(135deg, var(--brand-purple), #8B5CF6);
  color: #FFFFFF !important;
  border-color: transparent;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

/* ==========================================================================
   Detail Modal (弹窗)
   ========================================================================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 28px;
  box-shadow: var(--shadow-lg), 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  max-width: 650px;
  width: 100%;
  overflow: hidden;
  position: relative;
  animation: modalIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalIn {
  from { transform: scale(0.95) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(226, 232, 240, 0.8);
  border-radius: 50%;
  font-size: 1.2rem;
  color: var(--color-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: #FFFFFF;
  color: var(--color-dark);
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.modal-body {
  padding: 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.modal-header-grid {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
}

.modal-avatar {
  width: 140px;
  height: 140px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

.modal-intro-text {
  font-size: 0.98rem;
  line-height: 1.7;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(226, 232, 240, 0.7);
  padding: 20px;
  border-radius: 18px;
  box-shadow: none;
  color: #334155;
}

.modal-detail-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.modal-detail-label {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-dark);
}

.modal-detail-content {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(226, 232, 240, 0.7);
  padding: 14px 18px;
  border-radius: 14px;
  color: #475569;
}

/* ==========================================================================
   Interactive Wall Section (留言板)
   ========================================================================== */
.interactive-section {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 35px;
  margin-bottom: 60px;
}

@media (max-width: 900px) {
  .interactive-section {
    grid-template-columns: 1fr;
  }
}

.blessings-wall {
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 28px;
  box-shadow: var(--shadow-sm);
  padding: 30px;
  min-height: 480px;
  display: flex;
  flex-direction: column;
}

.blessings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 20px;
  max-height: 520px;
  overflow-y: auto;
  padding: 6px;
  flex-grow: 1;
}

.blessings-grid::-webkit-scrollbar {
  width: 6px;
}
.blessings-grid::-webkit-scrollbar-track {
  background: transparent;
}
.blessings-grid::-webkit-scrollbar-thumb {
  background-color: rgba(30, 41, 59, 0.1);
  border-radius: 99px;
}

.blessing-card {
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
  transform: rotate(var(--rotate, 0deg));
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  background-color: #FFFFFF;
  position: relative;
  overflow: hidden;
}

.blessing-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(0, 0, 0, 0.04);
}

.blessing-card:hover {
  transform: translateY(-6px) scale(1.05) rotate(0deg) !important;
  box-shadow: var(--shadow-md), 0 10px 20px rgba(0, 0, 0, 0.03);
  z-index: 2;
}

.blessing-sender {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-dark);
  margin-bottom: 10px;
  border-bottom: 1px dashed rgba(30, 41, 59, 0.06);
  padding-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.blessing-time {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-muted);
}

.blessing-content {
  font-family: var(--font-handwriting);
  font-size: 1.35rem;
  word-wrap: break-word;
  line-height: 1.5;
  color: #334155;
}

/* Sending Form Box */
.sending-box {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 28px;
  box-shadow: var(--shadow-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  height: fit-content;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: #475569;
}

.form-control {
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: 14px;
  padding: 12px 16px;
  font-family: var(--font-main);
  font-size: 0.95rem;
  outline: none;
  background-color: rgba(255, 255, 255, 0.6);
  transition: all 0.25s ease;
  color: var(--color-dark);
}

.form-control:focus {
  background-color: #FFFFFF;
  border-color: var(--brand-purple);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

textarea.form-control {
  resize: vertical;
  min-height: 110px;
}

.paper-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 4px;
}

.color-option {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid #FFFFFF;
  box-shadow: 0 0 0 1px rgba(30, 41, 59, 0.1);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.color-option:hover {
  transform: scale(1.1);
}

.color-option.selected {
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--brand-purple);
}

/* ==========================================================================
   Gallery Section (时光相册)
   ========================================================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.gallery-card {
  background: #FFFFFF;
  border: 1px solid rgba(226, 232, 240, 0.5);
  padding: 16px 16px 24px 16px;
  box-shadow: var(--shadow-md);
  border-radius: 16px; /* soft modern polaroid */
  transform: rotate(var(--rotate, 0deg));
  transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.gallery-card:hover {
  transform: translateY(-8px) rotate(0deg) scale(1.03);
  box-shadow: var(--shadow-lg), 0 12px 25px rgba(0, 0, 0, 0.05);
  z-index: 5;
}

.gallery-image-wrapper {
  aspect-ratio: 4/3;
  border-radius: 10px;
  border: none;
  overflow: hidden;
  margin-bottom: 16px;
  background-color: #F1F5F9;
}

.gallery-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.gallery-card:hover .gallery-image {
  transform: scale(1.06);
}

.gallery-caption {
  font-family: var(--font-handwriting);
  font-size: 1.5rem;
  color: #334155;
  text-align: center;
  line-height: 1.4;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  text-align: center;
  padding: 40px 0;
  border-top: 1px solid rgba(226, 232, 240, 0.8);
  margin-top: 80px;
  background-color: #0F172A;
  color: #94A3B8;
  font-weight: 500;
}

footer p {
  margin-bottom: 6px;
}

/* ==========================================================================
   Admin Dashboard & Authentication Panel
   ========================================================================== */
.admin-container {
  padding-top: 45px;
}

.admin-login-card {
  max-width: 450px;
  margin: 80px auto;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 28px;
  box-shadow: var(--shadow-lg);
  padding: 40px;
}

/* Alternating login bg color reset from original style */
.admin-login-card {
  background-color: rgba(255, 255, 255, 0.75) !important;
}

.admin-login-title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 2rem;
  color: var(--color-dark);
  margin-bottom: 12px;
  text-align: center;
}

.auth-tabs {
  display: flex;
  margin-bottom: 30px;
  border-radius: 99px;
  overflow: hidden;
  background: rgba(30, 41, 59, 0.04);
  padding: 4px;
  border: none;
}

.auth-tab {
  flex: 1;
  padding: 10px;
  text-align: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: transparent;
  border: none;
  border-radius: 99px;
  color: var(--color-muted);
  transition: all 0.25s ease;
}

.auth-tab.active {
  background: #FFFFFF;
  color: var(--brand-purple);
  box-shadow: var(--shadow-sm);
}

.user-welcome-card {
  background: linear-gradient(135deg, var(--brand-purple), #8B5CF6);
  padding: 30px;
  border-radius: 24px;
  margin-bottom: 40px;
  color: #FFFFFF;
  box-shadow: 0 12px 30px rgba(99, 102, 241, 0.2);
}

.user-welcome-card h2 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 2rem;
  margin-bottom: 8px;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  padding: 24px 30px;
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
}

/* Reset admin header color from original style */
.admin-header {
  background-color: rgba(255, 255, 255, 0.7) !important;
  box-shadow: var(--shadow-sm) !important;
}

.admin-header-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.8rem;
  color: var(--color-dark);
}

.admin-table-wrapper {
  background-color: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 24px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: 45px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.admin-table th, .admin-table td {
  padding: 18px 24px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  vertical-align: middle;
}

.admin-table th {
  background-color: rgba(248, 250, 252, 0.8);
  font-weight: 700;
  color: var(--color-dark);
  font-size: 0.95rem;
}

.admin-table tr:hover td {
  background-color: rgba(248, 250, 252, 0.4);
}

.admin-avatar-thumb {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.05);
  object-fit: cover;
  box-shadow: var(--shadow-sm);
}

.admin-actions {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 99px;
}

.user-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 10px;
}

.user-badge.admin {
  background: #FDF2F8;
  color: #DB2777;
  border: 1px solid rgba(219, 39, 119, 0.15);
}

.user-badge.user {
  background: #ECFDF5;
  color: #059669;
  border: 1px solid rgba(5, 150, 105, 0.15);
}

/* ==========================================================================
   Floating Action Button (FAB)
   ========================================================================== */
.fab {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 99;
}

.fab .btn {
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: linear-gradient(135deg, var(--brand-purple), #8B5CF6) !important;
  color: #FFFFFF !important;
  border: none;
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.35) !important;
}

.fab .btn:hover {
  transform: translateY(-4px) scale(1.05) !important;
  box-shadow: 0 15px 30px rgba(99, 102, 241, 0.45) !important;
}

/* ==========================================================================
   Mobile Responsive Tweak
   ========================================================================== */
/* ==========================================================================
   Mobile Responsive Tweak & Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  /* Container global adjustments */
  .container {
    padding: 0 16px;
  }

  /* Header & Capsule Nav Scrolled Adjustments */
  header.scrolled {
    margin-top: 6px;
    border-radius: 16px;
    margin-left: 8px;
    margin-right: 8px;
    padding: 8px 0;
  }

  .header-container {
    flex-direction: column;
    align-items: center; /* Center align header content on mobile */
    padding: 6px 0;
    gap: 8px;
  }

  header.scrolled .header-container {
    padding: 0 12px;
  }

  .logo {
    font-size: 1.5rem;
    gap: 6px;
  }

  nav {
    width: 100%;
    justify-content: center; /* Center align nav links */
    gap: 6px;
  }

  nav a, .btn {
    padding: 6px 12px;
    font-size: 0.8rem;
    gap: 4px;
  }

  /* Hero Section */
  .hero-section {
    padding: 20px 0 35px 0;
  }

  .hero-banner {
    padding: 40px 16px;
    border-radius: 20px;
  }

  .hero-title {
    font-size: 2.2rem;
    letter-spacing: 2px;
    margin-bottom: 8px;
  }

  .hero-subtitle {
    font-size: 1.4rem;
    margin-bottom: 20px;
  }

  .danmaku-screen {
    height: 160px;
  }

  .danmaku-item {
    font-size: 0.85rem;
    padding: 5px 12px;
  }

  /* Search bar spacing */
  .search-wrapper {
    margin-top: -10px;
    margin-bottom: 25px;
    padding: 0 4px;
  }

  .search-input-container input {
    padding: 12px 16px 12px 48px;
    font-size: 0.9rem;
  }

  .search-icon {
    left: 16px;
    width: 18px;
    height: 18px;
  }

  .section-header {
    margin: 40px 0 20px 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-bottom: 12px;
  }

  .section-header span {
    font-size: 0.85rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  /* Students Card layout */
  .students-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
  }

  .student-avatar-container {
    height: 200px;
  }

  .student-info {
    padding: 16px;
    gap: 8px;
  }

  .student-name {
    font-size: 1.2rem;
  }

  .student-quote {
    font-size: 1.25rem;
  }

  /* Detailed modal scrolling configuration */
  .modal {
    padding: 12px;
  }

  .modal-content {
    max-height: 85vh;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
  }

  .modal-body {
    padding: 24px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    gap: 20px;
  }

  .modal-header-grid {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 16px;
  }

  .modal-avatar {
    width: 110px;
    height: 110px;
    border-radius: 16px;
  }

  .modal-intro-text {
    padding: 14px;
    font-size: 0.9rem;
    border-radius: 12px;
  }

  .modal-detail-content {
    padding: 10px 14px;
    font-size: 0.9rem;
    border-radius: 10px;
  }

  .modal-close {
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    font-size: 1rem;
  }

  /* Blessings board layout */
  .blessings-wall {
    padding: 16px;
    min-height: 360px;
  }

  .blessings-grid {
    grid-template-columns: repeat(2, 1fr); /* 2 columns collage on mobile */
    gap: 12px;
  }

  .blessing-card {
    padding: 12px;
    border-radius: 14px;
  }

  .blessing-sender {
    font-size: 0.78rem;
    margin-bottom: 6px;
    padding-bottom: 4px;
  }

  .blessing-content {
    font-size: 1.1rem;
    line-height: 1.35;
  }

  .blessing-card::after {
    width: 40px;
    height: 14px;
    top: -2px;
  }

  .sending-box {
    padding: 20px;
    border-radius: 20px;
  }

  /* Polaroid Gallery Grid Collage adaptation */
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr); /* 2 columns collage on mobile */
    gap: 15px;
  }

  .gallery-card {
    padding: 8px 8px 16px 8px;
    border-radius: 10px;
  }

  .gallery-card::after {
    width: 50px;
    height: 16px;
    top: -8px;
  }

  .gallery-image-wrapper {
    margin-bottom: 8px;
  }

  .gallery-caption {
    font-size: 1.15rem;
  }

  /* Admin Section & Tables scroll configuration */
  .admin-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
    padding: 18px 20px;
    border-radius: 16px;
    margin-bottom: 25px;
  }

  .admin-header-title {
    font-size: 1.5rem;
  }

  .admin-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 16px;
    margin-bottom: 25px;
  }

  .admin-table {
    min-width: 680px; /* Force minimum width to enable scroll instead of squeezing */
  }

  .admin-table th, .admin-table td {
    padding: 12px 16px;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  /* Extra mobile optimization */
  .logo {
    font-size: 1.35rem;
  }

  nav {
    gap: 4px;
  }

  nav a, .btn {
    padding: 4px 10px;
    font-size: 0.75rem;
  }
}

/* Inline Vector Icon Helper */
.icon {
  width: 1.2em;
  height: 1.2em;
  vertical-align: -0.15em;
  display: inline-block;
  stroke-width: 2px;
  stroke: currentColor;
  fill: none;
}

/* ==========================================================================
   UX/UI Premium Enhancement Styles
   ========================================================================== */

/* 1. Hero Background Particle System */
.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.particle-bubble {
  position: absolute;
  bottom: -20px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatParticle 8s infinite ease-in;
}

@keyframes floatParticle {
  0% {
    transform: translateY(0) scale(0.6) translateX(0);
    opacity: 0;
  }
  15% {
    opacity: 0.7;
  }
  90% {
    opacity: 0.7;
  }
  100% {
    transform: translateY(-280px) scale(1.2) translateX(var(--drift, 30px));
    opacity: 0;
  }
}

/* Ensure banner text is above particles */
.hero-title, .hero-subtitle, .danmaku-screen {
  position: relative;
  z-index: 2;
}

/* 2. Interactive Search Box Styling */
.search-wrapper {
  margin: -15px auto 45px auto;
  max-width: 600px;
  width: 100%;
}

.search-input-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input-container input {
  width: 100%;
  padding: 16px 20px 16px 54px;
  border-radius: 99px;
  border: 1px solid rgba(30, 41, 59, 0.08);
  background-color: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  outline: none;
}

.search-input-container input:focus {
  background-color: var(--input-focus-bg);
  border-color: var(--brand-purple);
  box-shadow: var(--shadow-md), 0 0 0 4px rgba(99, 102, 241, 0.15);
  transform: translateY(-1px);
}

.search-icon {
  position: absolute;
  left: 20px;
  color: var(--color-muted);
  width: 22px;
  height: 22px;
  pointer-events: none;
  transition: color 0.3s;
}

.search-input-container input:focus + .search-icon {
  color: var(--brand-purple);
}

/* 3. Simulated Tape Adhesive Decorations (Physical Commemorative Feel) */
/* Blessings Sticky Note Tape */
.blessing-card::after {
  content: '';
  position: absolute;
  top: -3px;
  left: 50%;
  transform: translateX(-50%) rotate(-3deg);
  width: 55px;
  height: 18px;
  background-color: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  border-left: 1px dashed rgba(0, 0, 0, 0.05);
  border-right: 1px dashed rgba(0, 0, 0, 0.05);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
  pointer-events: none;
}

/* Gallery Polaroid Photo Tape */
.gallery-card {
  position: relative;
}

.gallery-card::after {
  content: '';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%) rotate(2deg);
  width: 65px;
  height: 22px;
  background-color: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  border-left: 1px dashed rgba(0, 0, 0, 0.06);
  border-right: 1px dashed rgba(0, 0, 0, 0.06);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
  z-index: 2;
  pointer-events: none;
}

/* 4. Quick Blessing Chips Styling */
.quick-blessings {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
  margin-bottom: 4px;
}

.quick-bless-item {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 99px;
  background-color: rgba(241, 245, 249, 0.8);
  border: 1px solid rgba(226, 232, 240, 0.8);
  color: var(--color-muted);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.quick-bless-item:hover {
  background-color: var(--brand-purple);
  color: #FFFFFF;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
}

.quick-bless-item:active {
  transform: translateY(0);
}

/* 5. Lightbox Modal Gallery Framework */
.lightbox-modal {
  background: rgba(11, 15, 25, 0.95) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1050;
}

.lightbox-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  max-width: 85%;
  max-height: 85%;
  width: auto;
  height: auto;
  animation: modalIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.lightbox-img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  border: 4px solid #FFFFFF;
  background-color: #0F172A;
}

.lightbox-caption {
  font-family: var(--font-handwriting);
  font-size: 1.8rem;
  color: #FFFFFF;
  margin-top: 18px;
  text-align: center;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
  max-width: 600px;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  font-size: 2.2rem;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s ease;
  z-index: 1060;
  user-select: none;
  outline: none;
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-50%) scale(1.08);
  border-color: rgba(255, 255, 255, 0.4);
}

.lightbox-prev {
  left: -74px;
}

.lightbox-next {
  right: -74px;
}

.lightbox-close {
  top: -60px;
  right: -60px;
  color: #FFFFFF !important;
  background: rgba(255, 255, 255, 0.1) !important;
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25) !important;
  color: #FFFFFF !important;
}

@media (max-width: 960px) {
  .lightbox-prev {
    left: -10px;
    background: rgba(15, 23, 42, 0.6);
  }
  .lightbox-next {
    right: -10px;
    background: rgba(15, 23, 42, 0.6);
  }
  .lightbox-close {
    top: -55px;
    right: 0;
  }
  .lightbox-content {
    max-width: 95%;
  }
}

/* 6. Dark Theme Deep Custom Overrides */
[data-theme="dark"] body {
  background-image: 
    radial-gradient(at 0% 0%, rgba(17, 24, 39, 0.8) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(88, 28, 135, 0.3) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(124, 45, 18, 0.15) 0px, transparent 50%),
    radial-gradient(at 0% 100%, rgba(20, 83, 45, 0.15) 0px, transparent 50%);
}

[data-theme="dark"] .student-card {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .student-card:hover {
  border-color: rgba(129, 140, 248, 0.3);
  box-shadow: var(--shadow-lg), 0 4px 20px rgba(129, 140, 248, 0.05);
}

[data-theme="dark"] .student-avatar-container {
  background-color: #0B0F19;
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .student-quote {
  color: #E2E8F0;
  border-left-color: rgba(129, 140, 248, 0.4);
}

[data-theme="dark"] .tag {
  color: var(--brand-purple);
  background-color: rgba(129, 140, 248, 0.1);
  border-color: rgba(129, 140, 248, 0.2);
}

[data-theme="dark"] .student-card:nth-child(2n) .tag {
  color: var(--brand-green);
  background-color: rgba(52, 211, 153, 0.1);
  border-color: rgba(52, 211, 153, 0.2);
}

[data-theme="dark"] .student-card:nth-child(3n) .tag {
  color: var(--brand-pink);
  background-color: rgba(244, 114, 182, 0.1);
  border-color: rgba(244, 114, 182, 0.2);
}

[data-theme="dark"] .student-card:nth-child(4n) .tag {
  color: var(--brand-blue);
  background-color: rgba(96, 165, 250, 0.1);
  border-color: rgba(96, 165, 250, 0.2);
}

[data-theme="dark"] .student-card .btn-sm {
  background-color: rgba(15, 23, 42, 0.6);
  color: var(--color-muted);
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .student-card:hover .btn-sm {
  background: linear-gradient(135deg, var(--brand-purple), #8B5CF6);
  color: #FFFFFF !important;
  border-color: transparent;
}

[data-theme="dark"] .blessings-wall {
  background: rgba(15, 23, 42, 0.4);
  border-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .blessing-card {
  filter: saturate(0.7) brightness(0.8);
  border-color: rgba(255, 255, 255, 0.05);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .blessing-card::after {
  background-color: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .blessing-sender {
  color: var(--color-dark);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .blessing-time {
  color: var(--color-muted);
}

[data-theme="dark"] .blessing-content {
  color: var(--color-dark);
}

[data-theme="dark"] .quick-bless-item {
  background-color: rgba(30, 41, 59, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--color-muted);
}

[data-theme="dark"] .sending-box {
  background: rgba(30, 41, 59, 0.7);
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .gallery-card {
  background: #1E293B;
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .gallery-card::after {
  background-color: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .gallery-card:hover {
  box-shadow: var(--shadow-lg), 0 12px 25px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .gallery-image-wrapper {
  background-color: #0F172A;
}

[data-theme="dark"] .gallery-caption {
  color: #E2E8F0;
}

[data-theme="dark"] .modal-content {
  background-color: rgba(30, 41, 59, 0.95);
  border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .modal-close {
  background: rgba(15, 23, 42, 0.8);
  border-color: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .modal-close:hover {
  background: #1E293B;
  color: var(--color-dark);
}

[data-theme="dark"] .modal-intro-text,
[data-theme="dark"] .modal-detail-content {
  background: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.05);
  color: #E2E8F0;
}

[data-theme="dark"] .modal-detail-label {
  color: #F1F5F9;
}

[data-theme="dark"] .user-welcome-card {
  background: linear-gradient(135deg, #4F46E5, #7C3AED);
  box-shadow: 0 12px 30px rgba(79, 70, 229, 0.3);
}

[data-theme="dark"] .admin-table th {
  background-color: rgba(15, 23, 42, 0.8);
  color: #F1F5F9;
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .admin-table td {
  border-bottom-color: rgba(255, 255, 255, 0.05);
  color: #CBD5E1;
}

[data-theme="dark"] .admin-table tr:hover td {
  background-color: rgba(15, 23, 42, 0.4);
}

[data-theme="dark"] .form-group label {
  color: #94A3B8;
}

[data-theme="dark"] .form-control {
  background-color: rgba(15, 23, 42, 0.6);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--color-dark);
}

[data-theme="dark"] .form-control:focus {
  background-color: #1E293B;
  border-color: var(--brand-purple);
  box-shadow: 0 0 0 4px rgba(129, 140, 248, 0.15);
}

[data-theme="dark"] .lightbox-img {
  border-color: #1E293B;
}

[data-theme="dark"] header.scrolled {
  background-color: rgba(15, 23, 42, 0.7);
  box-shadow: var(--shadow-md), 0 0 0 1px rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .section-header {
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .section-title {
  color: #F1F5F9;
}

/* ==========================================================================
   Wave Loader - 波浪文本加载动画（用于图片加载占位）
   ========================================================================== */
.wave-loader {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #1A1A1A;
  border-radius: 10px;
  overflow: hidden;
  z-index: 2;
  -webkit-box-reflect: below -18px linear-gradient(transparent, rgba(0,0,0,0.4));
}

.wave-loader span {
  position: relative;
  display: inline-flex;
  font-size: 1.5em;
  color: transparent;
  text-transform: uppercase;
  -webkit-text-stroke: 1.5px rgba(255, 255, 255, 0.6);
  font-weight: 800;
  font-family: var(--font-main);
  animation: wave-animate 2s ease-in-out infinite;
  animation-delay: calc(0.15s * var(--i));
}

@keyframes wave-animate {
  0% {
    transform: translateY(0);
    color: transparent;
    text-shadow: none;
  }
  20% {
    transform: translateY(-30px);
    color: #FFF;
    text-shadow:
      0 0 5px #FFF,
      0 0 15px var(--brand-yellow),
      0 0 30px var(--brand-orange);
  }
  40%, 100% {
    transform: translateY(0);
    color: transparent;
    text-shadow: none;
  }
}

/* 加载完成后隐藏 */
.gallery-image-wrapper.loaded .wave-loader {
  display: none;
}

/* 暗色主题适配 */
[data-theme="dark"] .wave-loader {
  background: #0F172A;
}