/* ==========================================================================
   PORTAL KAS KELAS TRPL 25A1 - HIGH-END CYBER DARK DESIGN SYSTEM
   Dominan: Deep Obsidian Dark (#06080e), Crimson Neon Red (#ff2a5f / #ef4444), & Clean White (#ffffff)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700;800&display=swap');

:root {
  /* Skema Warna Gelap Obsidian */
  --bg-dark-base: #06080e;
  --bg-dark-surface: #0a0e18;
  --bg-dark-card: rgba(13, 19, 33, 0.76);
  --bg-dark-card-hover: rgba(20, 29, 48, 0.90);
  --bg-dark-input: rgba(10, 14, 24, 0.85);

  /* Aksen Merah Crimson (Semangat & Identitas Utama) */
  --red-glow: #ff2a5f;
  --red-primary: #ef4444;
  --red-bright: #f43f5e;
  --red-dark: #b91c1c;
  --red-soft: rgba(239, 68, 68, 0.14);
  --red-border: rgba(244, 63, 94, 0.35);
  --red-shadow: rgba(239, 68, 68, 0.35);

  /* Aksen Hijau (Pemasukan & Status Aman) */
  --green-glow: #10b981;
  --green-soft: rgba(16, 185, 129, 0.15);
  --green-border: rgba(16, 185, 129, 0.3);

  /* Aksen Amber (Tunggakan & Peringatan) */
  --amber-glow: #f59e0b;
  --amber-soft: rgba(245, 158, 11, 0.15);
  --amber-border: rgba(245, 158, 11, 0.3);

  /* Teks & Netral Putih */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;
  --border-subtle: rgba(255, 255, 255, 0.09);
  --border-hover: rgba(255, 255, 255, 0.22);

  /* Tipografi */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transisi */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Reset & Basis */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-dark-base);
  color: var(--text-primary);
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  line-height: 1.6;
  background-color: var(--bg-dark-base);
  background-image: 
    radial-gradient(circle at 12% 18%, rgba(239, 68, 68, 0.12) 0%, transparent 42%),
    radial-gradient(circle at 88% 25%, rgba(255, 42, 95, 0.10) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(220, 38, 38, 0.08) 0%, transparent 50%),
    linear-gradient(to bottom, rgba(6, 8, 14, 0.94), rgba(6, 8, 14, 1));
  background-attachment: fixed;
  display: flex;
  flex-direction: column;
}

/* Custom Text Selection */
::selection {
  background: var(--red-glow);
  color: #ffffff;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark-base);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--red-primary), #881337);
  border-radius: 9999px;
  border: 2px solid var(--bg-dark-base);
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--red-glow), var(--red-primary));
}

/* Dynamic Interactive Canvas */
#particlesCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
}

/* Cyber Ambient Glows */
.cyber-ambient-light {
  position: fixed;
  border-radius: 50%;
  filter: blur(130px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  animation: floatAmbient 16s ease-in-out infinite alternate;
}
.cyber-light-red-1 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(255, 42, 95, 0.35) 0%, transparent 70%);
  top: -10%;
  left: -5%;
}
.cyber-light-red-2 {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(239, 68, 68, 0.28) 0%, transparent 70%);
  bottom: 5%;
  right: -8%;
  animation-delay: -8s;
}

@keyframes floatAmbient {
  0% { transform: translateY(0) scale(1); }
  50% { transform: translateY(40px) scale(1.08); }
  100% { transform: translateY(-30px) scale(0.96); }
}

/* Grid Overlay Texture */
.cyber-grid-overlay {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(6, 8, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.gradient-text-red-white {
  background: linear-gradient(135deg, #ffffff 0%, #ffe4e6 50%, #f43f5e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-red-glow {
  background: linear-gradient(135deg, #ff2a5f 0%, #ef4444 60%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn-primary-red {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 50%, #b91c1c 100%);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.625rem 1.25rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 20px rgba(239, 68, 68, 0.35);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
}
.btn-primary-red:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(255, 42, 95, 0.5);
  background: linear-gradient(135deg, #f43f5e 0%, #ef4444 50%, #dc2626 100%);
  color: #ffffff;
}
.btn-primary-red:active {
  transform: translateY(0);
}

.btn-glass-subtle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.625rem 1.25rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
}
.btn-glass-subtle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  transform: translateY(-1px);
}

/* Glass Card */
.glass-card {
  background: var(--bg-dark-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  border-radius: 1.25rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
}
.glass-card:hover {
  border-color: rgba(239, 68, 68, 0.35);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

/* Hero Ledger Box */
.hero-ledger-card {
  background: linear-gradient(145deg, rgba(24, 10, 16, 0.92) 0%, rgba(13, 19, 33, 0.95) 100%);
  border: 1px solid rgba(244, 63, 94, 0.3);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 40px rgba(239, 68, 68, 0.12);
  position: relative;
  overflow: hidden;
}
.hero-ledger-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to bottom, transparent, transparent 28px, rgba(255, 255, 255, 0.025) 29px);
  pointer-events: none;
}

/* Status Pulsing Dot */
.status-pulsing-dot {
  position: relative;
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
}
.status-pulsing-dot::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background-color: #10b981;
  opacity: 0.75;
  animation: pulsePing 1.8s cubic-bezier(0, 0, 0.2, 1) infinite;
}
@keyframes pulsePing {
  0% { transform: scale(1); opacity: 0.8; }
  75%, 100% { transform: scale(2.4); opacity: 0; }
}

/* Chip Badges */
.chip-month-paid {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34d399;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  transition: all var(--transition-fast);
}
.chip-month-paid:hover {
  background: rgba(16, 185, 129, 0.22);
  border-color: rgba(16, 185, 129, 0.6);
  transform: translateY(-1px);
}

.chip-month-unpaid {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #f87171;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  transition: all var(--transition-fast);
}
.chip-month-unpaid:hover {
  background: rgba(239, 68, 68, 0.22);
  border-color: rgba(239, 68, 68, 0.6);
  transform: translateY(-1px);
}

/* Filter Tab Active State */
.filter-tab {
  padding: 0.5rem 1rem;
  border-radius: 0.625rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.filter-tab:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}
.filter-tab.active {
  color: #ffffff;
  background: rgba(239, 68, 68, 0.18);
  border-color: rgba(244, 63, 94, 0.4);
  box-shadow: 0 0 16px rgba(239, 68, 68, 0.25);
}

/* Input Fields */
.cyber-input {
  width: 100%;
  background: var(--bg-dark-input);
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}
.cyber-input:focus {
  outline: none;
  border-color: var(--red-glow);
  box-shadow: 0 0 0 3px rgba(255, 42, 95, 0.2);
  background: rgba(14, 20, 34, 0.95);
}
.cyber-input::placeholder {
  color: var(--text-muted);
}

/* Table Scrollbar & Row Hover */
.table-container::-webkit-scrollbar {
  height: 6px;
  width: 6px;
}
.table-container::-webkit-scrollbar-thumb {
  background: rgba(244, 63, 94, 0.4);
  border-radius: 9999px;
}
.table-container::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
}

.table-row-item {
  transition: background-color var(--transition-fast);
}
.table-row-item:hover {
  background-color: rgba(255, 42, 95, 0.06) !important;
}

/* Modal Popup */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 6, 10, 0.82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: #0d1322;
  border: 1px solid rgba(244, 63, 94, 0.35);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 40px rgba(239, 68, 68, 0.2);
  border-radius: 1.25rem;
  width: 100%;
  max-width: 32rem;
  max-height: 90vh;
  max-height: 90dvh;
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: scale(0.94) translateY(10px);
  transition: transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.modal-content::-webkit-scrollbar {
  width: 6px;
}
.modal-content::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.03);
  border-radius: 9999px;
}
.modal-content::-webkit-scrollbar-thumb {
  background: rgba(239, 68, 68, 0.35);
  border-radius: 9999px;
}
.modal-content::-webkit-scrollbar-thumb:hover {
  background: rgba(239, 68, 68, 0.65);
}
.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
  animation: fadeIn 0.3s ease-out forwards;
}

/* Shimmer Loading Effect */
.skeleton-shimmer {
  background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.03) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ==========================================================================
   MOBILE PERFORMANCE ENGINE (ULTRA-LIGHTWEIGHT CYBER BLUEPRINT)
   ========================================================================== */
@media (max-width: 768px) {
  /* 1. Sembunyikan canvas & ambient divs agar hemat 100% VRAM GPU */
  #particlesCanvas,
  .cyber-ambient-light,
  .cyber-grid-overlay {
    display: none !important;
  }

  /* 2. Cyber Matrix Blueprint: Background grid titik-titik merah kas neon super ringan */
  body {
    background-color: #06080e !important;
    background-image: 
      radial-gradient(circle at 15% 15%, rgba(255, 42, 95, 0.16) 0%, transparent 45%),
      radial-gradient(circle at 85% 25%, rgba(239, 68, 68, 0.16) 0%, transparent 45%),
      radial-gradient(rgba(244, 63, 94, 0.12) 1px, transparent 1px) !important;
    background-size: 100% 100%, 100% 100%, 24px 24px !important;
    background-attachment: scroll !important;
  }

  /* 3. Kartu Solid Obsidian Dark dengan Neon Cyber Border 1px (0ms blur computation) */
  .glass-card {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: #0a0e18 !important;
    border: 1px solid rgba(244, 63, 94, 0.22) !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5) !important;
  }

  .site-header {
    background: #06080e !important;
    border-bottom: 1px solid rgba(244, 63, 94, 0.18) !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  /* 4. Modal, Hero Ledger, Chips & Buttons: Bebas blur & compositing lag */
  .modal-overlay {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: rgba(6, 8, 14, 0.95) !important;
  }
  .modal-content {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: #0d1322 !important;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8) !important;
  }
  .hero-ledger-card {
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5) !important;
  }
  .status-pulsing-dot::after {
    animation: none !important;
  }
  .btn-primary-red, .btn-glass-subtle {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }

  /* 5. Virtualized DOM Rendering untuk tabel & daftar panjang */
  #transactionSection, #studentStatusSection {
    content-visibility: auto;
    contain-intrinsic-size: 1px 600px;
  }
}