/* ─── DESIGN SYSTEM ─── */
:root {
  /* Light Theme (Default) */
  --bg-primary: hsl(210, 40%, 98%);
  --bg-secondary: hsl(0, 0%, 100%);
  --bg-accent: hsla(217, 91%, 60%, 0.06);
  
  --text-primary: hsl(222, 47%, 11%);
  --text-secondary: hsl(215, 16%, 35%);
  --text-muted: hsl(215, 16%, 55%);
  
  --brand: hsl(217, 91%, 60%);
  --brand-gradient: linear-gradient(135deg, hsl(217, 91%, 60%) 0%, hsl(262, 83%, 58%) 100%);
  
  --border: hsla(217, 91%, 60%, 0.1);
  --border-focus: hsla(217, 91%, 60%, 0.5);
  
  --glass-bg: hsla(0, 0%, 100%, 0.7);
  --glass-border: hsla(217, 91%, 60%, 0.1);
  --glass-shadow: 0 8px 32px 0 hsla(222, 47%, 11%, 0.05);

  --tw1: hsl(217, 91%, 60%);
  --tw2: hsl(142, 71%, 45%);
  --tw3: hsl(38, 92%, 50%);
  --tw4: hsl(350, 89%, 60%);
  
  /* Shared Layout */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: hsl(222, 47%, 7%);
  --bg-secondary: hsl(222, 47%, 11%);
  --bg-accent: hsla(217, 91%, 60%, 0.15);
  
  --text-primary: hsl(210, 40%, 98%);
  --text-secondary: hsl(215, 25%, 72%);
  --text-muted: hsl(215, 16%, 47%);
  
  --border: hsla(217, 33%, 25%, 0.8);
  --glass-bg: hsla(222, 47%, 11%, 0.7);
  --glass-border: hsla(217, 33%, 25%, 0.3);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Custom noise texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 100;
}

/* ─── UTILITIES ─── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.hidden { display: none !important; }

/* ─── HEADER ─── */
header {
  position: relative;
  padding: 80px 0 60px;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, hsla(217, 91%, 60%, 0.1) 0%, transparent 70%);
  filter: blur(60px);
  z-index: -1;
}

.header-main-group {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-top: 40px;
}

.school-logo-large {
  height: 120px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 10px 25px rgba(0,0,0,0.15));
  transition: var(--transition);
}

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

.header-text {
  flex: 1;
}

.header-main-group h1 {
  margin-bottom: 8px;
  text-align: left;
}

.header-main-group .subtitle {
  text-align: left;
}

.header-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.badge-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.theme-toggle:hover {
  border-color: var(--brand);
  color: var(--brand);
  transform: rotate(15deg) scale(1.1);
}

.badge {
  background: var(--bg-accent);
  border: 1px solid var(--border-focus);
  color: var(--brand);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  border-radius: 99px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

h1 {
  font-family: 'Lora', serif;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  background: linear-gradient(to bottom, var(--text-primary) 40%, var(--text-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

h1 span {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
}

.header-meta {
  display: flex;
  gap: 32px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.meta-item i {
  font-size: 18px;
  color: var(--brand);
}

/* ─── SEARCH & FILTER ─── */
.controls-bar {
  position: sticky;
  top: 24px;
  z-index: 50;
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  padding: 8px;
  border-radius: var(--radius-lg);
}

.search-box {
  position: relative;
  flex-grow: 1;
}

.search-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 14px 20px 14px 48px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 15px;
  box-shadow: 0 2px 10px hsla(222, 47%, 11%, 0.05);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--brand);
  background: var(--bg-primary);
  box-shadow: 0 0 0 4px var(--bg-accent);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}


/* ─── GRID ─── */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.category-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  animation: entrance 0.6s ease-out both;
}

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

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px -20px rgba(0,0,0,0.5);
  border-color: var(--brand);
}

.card-header {
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border-bottom: 1px solid var(--border);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  background: hsla(217, 91%, 60%, 0.1);
  border: 1px solid hsla(217, 91%, 60%, 0.2);
}

.card-info {
  flex: 1;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.card-body {
  padding: 20px;
  flex-grow: 1;
}

/* ─── DOCUMENT LIST ─── */
.doc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.doc-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: var(--transition);
}

.doc-item:hover {
  background: var(--bg-accent);
  border-color: var(--brand);
  transform: translateX(4px);
}


.doc-name {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-date {
  font-size: 11px;
  color: var(--text-muted);
}

/* ─── FOOTER ─── */
.footer-content {
  text-align: center;
  margin-top: 64px;
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.footer-credit {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-muted);
}

.footer-credit a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 500;
}

.footer-credit a:hover { text-decoration: underline; }

/* ─── UTILITIES ─── */
.hidden { display: none !important; }

/* ─── RESPONSIVE ─── */
@media (max-width: 768px) {
  header { padding: 40px 0; }
  .header-main-group {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }
  .header-main-group h1, .header-main-group .subtitle {
    text-align: center;
  }
  .school-logo-large { height: 80px; }
  .header-meta { flex-direction: column; gap: 12px; }
  .controls-bar {
    position: relative;
    top: 0;
    margin-bottom: 32px;
  }
}

/* ─── LOGIN OVERLAY ─── */
.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  background-image:
    radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%),
    radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%),
    radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);
  padding: 20px;
}

[data-theme="light"] .login-overlay {
  background-image: 
    radial-gradient(at 0% 0%, hsla(253,100%,95%,1) 0, transparent 50%), 
    radial-gradient(at 50% 0%, hsla(225,100%,90%,1) 0, transparent 50%), 
    radial-gradient(at 100% 0%, hsla(339,100%,95%,1) 0, transparent 50%);
}

.login-box {
  width: 100%;
  max-width: 400px;
  padding: 40px;
  text-align: center;
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-logo {
  height: 80px;
  margin-bottom: 24px;
  filter: drop-shadow(0 0 20px rgba(255,255,255,0.2));
}

.login-header h2 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.login-header p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.input-group {
  position: relative;
}

.input-group input {
  width: 100%;
  padding: 14px 14px 14px 44px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 16px;
  transition: var(--transition);
}

.input-group input:focus {
  outline: none;
  border-color: var(--brand);
  background: var(--bg-primary);
}

.input-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.login-error {
  color: #ff4d4d;
  font-size: 13px;
  font-weight: 500;
  margin-top: -10px;
}

.login-btn {
  width: 100%;
  padding: 14px;
  background: var(--brand);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: var(--transition);
}

.login-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 10px 20px -5px hsla(222, 100%, 61%, 0.4);
}

.login-footer {
  margin-top: 32px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Shake Animation */
.shake {
  animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}