/* ==========================================================================
   Unilib — Modern Academic Design System
   Inspired by mbkbucket's glassmorphism design language
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Primary teal palette */
  --primary:         #0f766e;
  --primary-lt:      #d7f4ee;
  --primary-dk:      #0b4f4a;
  --primary-hover:   #0d635c;
  --secondary:       #1f8f84;

  /* Semantic surfaces */
  --body-bg:         #f4f7f3;
  --bg-surface:      rgba(255, 255, 255, 0.88);
  --bg-surface-2:    rgba(244, 247, 243, 0.80);
  --bg-surface-3:    #e2ede8;

  /* Borders */
  --border:          rgba(15, 118, 110, 0.18);
  --border-lt:       rgba(15, 118, 110, 0.10);
  --border-solid:    #c0d9ce;

  /* Text */
  --text:            #1f2a2a;
  --text-2:          #425855;
  --text-muted:      #667c79;
  --text-disabled:   #a0b2af;

  /* Status */
  --danger:  #dc2626;
  --warning: #d97706;
  --success: #16a34a;
  --info:    #3b82f6;
  --danger-lt:  rgba(220, 38, 38, 0.10);
  --warning-lt: rgba(217, 119, 6, 0.12);
  --success-lt: rgba(22, 163, 74, 0.12);

  /* Typography */
  --font:          "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-headings: "Sora", "Segoe UI", system-ui, sans-serif;
  --font-mono:     "JetBrains Mono", "SF Mono", Consolas, monospace;

  /* Radii */
  --radius-sm: 6px;
  --radius:    8px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
  --shadow:    0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
  --shadow-md: 0 10px 15px -3px rgba(15,118,110,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 20px 25px -5px rgba(15,118,110,0.10), 0 10px 10px -5px rgba(0,0,0,0.04);

  /* Transitions */
  --transition: all 0.18s ease;
}

/* --------------------------------------------------------------------------
   Global Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font);
  background-color: var(--body-bg);
  color: var(--text);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   Body — Animated Gradient Background (mbkbucket-style)
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font);
  background:
    radial-gradient(circle at 12% 14%, rgba(16, 185, 129, 0.13), transparent 46%),
    radial-gradient(circle at 86% 8%,  rgba(244, 114, 38, 0.11), transparent 42%),
    linear-gradient(160deg, #eef7f2 0%, #f8fbf7 52%, #eaf2ef 100%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
  isolation: isolate;
}

/* Floating orb glow effects */
body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 999px;
  pointer-events: none;
  z-index: -1;
}

body::before {
  width: 320px;
  height: 320px;
  left: -100px;
  top: 15vh;
  background: radial-gradient(circle, rgba(15, 118, 110, 0.16) 0%, rgba(15, 118, 110, 0) 70%);
}

body::after {
  width: 360px;
  height: 360px;
  right: -140px;
  bottom: 8vh;
  background: radial-gradient(circle, rgba(251, 146, 60, 0.16) 0%, rgba(251, 146, 60, 0) 72%);
}

/* --------------------------------------------------------------------------
   Typography — Sora for headings
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6,
.font-headings, .font-serif {
  font-family: var(--font-headings);
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   Custom Scrollbar
   -------------------------------------------------------------------------- */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-solid); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* --------------------------------------------------------------------------
   Glass Surface Card (mbkbucket-style)
   -------------------------------------------------------------------------- */
.classic-card {
  background: var(--bg-surface);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.classic-card:hover {
  border-color: rgba(15, 118, 110, 0.32);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   Form Inputs
   -------------------------------------------------------------------------- */
.input-classic {
  background: rgba(255, 255, 255, 0.90);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  font-family: var(--font);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input-classic:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.14);
  outline: none;
  background: #ffffff;
}

.input-classic::placeholder { color: var(--text-disabled); }

/* --------------------------------------------------------------------------
   Semester Tab Strip
   -------------------------------------------------------------------------- */
.semester-tab {
  padding: 0.42rem 0.9rem;
  border-radius: var(--radius);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  background: rgba(255, 255, 255, 0.80);
  border: 1px solid var(--border);
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
  font-family: var(--font);
  backdrop-filter: blur(6px);
}

.semester-tab:hover {
  color: var(--primary-dk);
  border-color: var(--primary);
  background: var(--primary-lt);
}

.semester-tab.active {
  color: #ffffff;
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(15, 118, 110, 0.28);
}

/* --------------------------------------------------------------------------
   Catalog Layout Engine (Grid / List View)
   -------------------------------------------------------------------------- */
#catalogContainer.view-grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 1.25rem;
}

@media (min-width: 640px)  { #catalogContainer.view-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { #catalogContainer.view-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 1280px) { #catalogContainer.view-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

#catalogContainer.view-grid  .item-list-row  { display: none   !important; }
#catalogContainer.view-grid  .item-grid-card { display: flex   !important; }
#catalogContainer.view-list { display: flex; flex-direction: column; gap: 0.75rem; }
#catalogContainer.view-list .item-grid-card  { display: none   !important; }
#catalogContainer.view-list .item-list-row   { display: flex   !important; }

/* --------------------------------------------------------------------------
   Quick View Modal (Glassmorphic)
   -------------------------------------------------------------------------- */
.quick-view-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 42, 42, 0.52);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.quick-view-modal {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  max-width: 740px;
  width: 100%;
  max-height: 92vh;
  overflow-y: auto;
  position: relative;
}

/* --------------------------------------------------------------------------
   Semester Chip Buttons (Admin form)
   -------------------------------------------------------------------------- */
.semester-chip-btn {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.80);
  color: var(--text-2);
  cursor: pointer;
  transition: var(--transition);
}

.semester-chip-btn:hover {
  border-color: var(--primary);
  color: var(--primary-dk);
  background: var(--primary-lt);
}

.semester-chip-btn.selected {
  background: var(--primary-lt);
  border-color: var(--primary);
  color: var(--primary-dk);
  font-weight: 600;
  box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.12);
}

/* --------------------------------------------------------------------------
   Button Utilities
   -------------------------------------------------------------------------- */
.btn-teal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 7px 16px;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  background: var(--primary);
  color: #ffffff;
  border: 1px solid var(--primary);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(15, 118, 110, 0.22);
}

.btn-teal:hover {
  background: var(--primary-dk);
  border-color: var(--primary-dk);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.30);
}

.btn-outline-teal {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 7px 16px;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.85);
  color: var(--text);
  border: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-outline-teal:hover {
  background: var(--primary-lt);
  color: var(--primary-dk);
  border-color: var(--primary);
}

/* --------------------------------------------------------------------------
   Page Header Component
   -------------------------------------------------------------------------- */
.page-header-glass {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.3rem;
  border: 1px solid rgba(255, 255, 255, 0.88);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.05);
  margin-bottom: 1.25rem;
}

/* --------------------------------------------------------------------------
   Lazy Load Fade-in
   -------------------------------------------------------------------------- */
img.lazy-load {
  opacity: 0;
  transition: opacity 0.3s ease;
}

img.lazy-load.loaded {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   Toast / Alert (shared)
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}