/* ========================================================
   ACADEMIC DIGITAL CALENDAR — Minimalist Design System
   Custom CSS (Tailwind handles layout + utilities)
   ======================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: #111111;
  background: #FAFAFA;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Page Transitions ───────────────────────────────────── */
.page-enter {
  animation: pageEnter 0.4s ease-out both;
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.4s ease-out both;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.slide-up {
  animation: slideUp 0.4s ease-out both;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Staggered children animation */
.stagger > *:nth-child(1) { animation-delay: 0.05s; }
.stagger > *:nth-child(2) { animation-delay: 0.10s; }
.stagger > *:nth-child(3) { animation-delay: 0.15s; }
.stagger > *:nth-child(4) { animation-delay: 0.20s; }
.stagger > *:nth-child(5) { animation-delay: 0.25s; }
.stagger > *:nth-child(6) { animation-delay: 0.30s; }

/* ── Hero Section (Homepage) ────────────────────────────── */
.hero-section {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.hero-section img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.35) saturate(0.8);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 10%;
}

/* ── Minimal Card ──────────────────────────────────────── */
.editorial-card {
  background: #ffffff;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  padding: 2rem;
}

/* ── Banner Carousel ────────────────────────────────────── */
.banner-wrapper {
  position: relative;
  width: 100%;
  height: 240px;
  overflow: hidden;
  border-radius: 4px;
  border: 1px solid #E5E5E5;
}

.banner-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.8s ease;
}

/* ── Calendar Grid ──────────────────────────────────────── */
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.cal-day-header {
  text-align: center;
  padding: 8px 4px;
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #888888;
}

.cal-cell {
  position: relative;
  min-height: 80px;
  padding: 6px 8px;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  background: #ffffff;
  cursor: pointer;
  transition: background 0.15s ease;
}

.cal-cell:hover {
  background: #F5F5F5;
}

.cal-cell.today {
  border-color: #111111;
  border-width: 2px;
}

.cal-cell.today .cal-number {
  background: #111111;
  color: #ffffff;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.cal-cell.empty {
  background: transparent;
  border-color: transparent;
  cursor: default;
}

.cal-cell.empty:hover {
  background: transparent;
}

.cal-number {
  font-size: 0.85rem;
  font-weight: 500;
  color: #111111;
}

.cal-badge {
  position: absolute;
  bottom: 4px;
  right: 4px;
  background: #111111;
  color: #ffffff;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}

/* ── Calendar Navigation ────────────────────────────────── */
.cal-nav-btn {
  background: none;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  padding: 6px 14px;
  cursor: pointer;
  color: #111111;
  font-size: 0.9rem;
  transition: background 0.15s, border-color 0.15s;
}

.cal-nav-btn:hover {
  background: #F5F5F5;
  border-color: #111111;
}

/* ── Modal ──────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: #ffffff;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  padding: 2rem;
  max-width: 480px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  transform: translateY(12px);
  transition: transform 0.2s ease;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

/* ── Feed Items ─────────────────────────────────────────── */
.feed-item {
  background: #ffffff;
  border: 1px solid #E5E5E5;
  border-left: 3px solid #111111;
  padding: 1.25rem;
  border-radius: 0 4px 4px 0;
  transition: background 0.15s ease;
}

.feed-item:hover {
  background: #FAFAFA;
}

.feed-item + .feed-item {
  margin-top: 0.75rem;
}

/* Type-specific left border colors */
.feed-item[data-type="Quiz"] {
  border-left-color: #888888;
}

.feed-item[data-type="Assignment"] {
  border-left-color: #111111;
}

.feed-item[data-type="Exam"] {
  border-left-color: #DC2626;
}

/* ── Type Badges ────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 10px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 4px;
}

.badge-quiz {
  background: #F5F5F5;
  color: #555555;
  border: 1px solid #E5E5E5;
}

.badge-assignment {
  background: #F5F5F5;
  color: #333333;
  border: 1px solid #E5E5E5;
}

.badge-exam {
  background: #111111;
  color: #ffffff;
}

.badge-student {
  background: #F5F5F5;
  color: #555555;
  border: 1px solid #E5E5E5;
}

.badge-teacher {
  background: #F5F5F5;
  color: #333333;
  border: 1px solid #E5E5E5;
}

.badge-admin {
  background: #111111;
  color: #ffffff;
}

/* ── Form Elements ─────────────────────────────────────── */
.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  background: #ffffff;
  color: #111111;
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-input:focus {
  border-color: #111111;
}

.form-input::placeholder {
  color: #AAAAAA;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: #888888;
  margin-bottom: 4px;
}

.form-select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid #E5E5E5;
  border-radius: 4px;
  background: #ffffff;
  color: #111111;
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: border-color 0.15s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23111111' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-select:focus {
  border-color: #111111;
}

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, opacity 0.15s ease;
  text-decoration: none;
}

.btn:active {
  opacity: 0.85;
}

.btn-primary {
  background: #111111;
  color: #ffffff;
}

.btn-primary:hover {
  background: #333333;
}

.btn-secondary {
  background: #111111;
  color: #ffffff;
}

.btn-secondary:hover {
  background: #333333;
}

.btn-outline {
  background: transparent;
  border: 1px solid #E5E5E5;
  color: #111111;
}

.btn-outline:hover {
  border-color: #111111;
  background: #F5F5F5;
}

.btn-danger {
  background: transparent;
  border: 1px solid #DC2626;
  color: #DC2626;
}

.btn-danger:hover {
  background: #DC2626;
  color: #ffffff;
}

.btn-sm {
  padding: 5px 14px;
  font-size: 0.8rem;
}

/* ── Profile Picture ────────────────────────────────────── */
.profile-pic {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #E5E5E5;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

.profile-pic:hover {
  border-color: #111111;
}

/* ── Auth Tabs ──────────────────────────────────────────── */
.auth-tab {
  flex: 1;
  padding: 10px;
  background: transparent;
  border: none;
  border-bottom: 2px solid #E5E5E5;
  color: #AAAAAA;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.auth-tab.active {
  color: #111111;
  border-bottom-color: #111111;
}

.auth-tab:hover {
  color: #111111;
}

/* ── Divider ────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: #E5E5E5;
  margin: 1.5rem 0;
}

/* ── Toast Notification ─────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 14px 24px;
  background: #111111;
  color: #ffffff;
  font-family: inherit;
  font-size: 0.85rem;
  border-radius: 4px;
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.error {
  background: #DC2626;
}

.toast.success {
  background: #16A34A;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero-overlay {
    padding: 0 6%;
    align-items: center;
    text-align: center;
  }

  .cal-grid {
    gap: 2px;
  }

  .cal-cell {
    min-height: 50px;
    padding: 4px;
  }

  .cal-day-header {
    font-size: 0.65rem;
    padding: 4px 2px;
  }

  .cal-number {
    font-size: 0.75rem;
  }

  .cal-badge {
    font-size: 0.55rem;
    padding: 1px 4px;
  }
}

/* ── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: #FAFAFA;
}

::-webkit-scrollbar-thumb {
  background: #D4D4D4;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: #AAAAAA;
}

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