/* ============ CSS VARIABLES ============ */
:root {
  --navy-dark: #0a1628;
  --navy-mid: #0d1f3c;
  --navy-light: #152847;
  --green-bright: #4ade80;
  --green-mid: #22c55e;
  --green-light: #86efac;
  --green-pale: #dcfce7;
  --cyan-accent: #22d3ee;
  --bg-light: #f0f9ff;
  --bg-card: #ffffff;
  --text-dark: #0f172a;
  --text-mid: #475569;
  --text-light: #94a3b8;
  --white: #FFFFFF;
  --shadow: rgba(10, 22, 40, 0.15);
  --shadow-strong: rgba(10, 22, 40, 0.25);
}

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

body {
  font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* ============ HEADER ============ */
.header {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy-mid) 50%, var(--navy-light) 100%);
  color: var(--white);
  padding: 2rem 2rem 2.5rem;
  text-align: center;
}

.header-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.header-logo-svg { width: 80px; height: 80px; }
.header h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 700; color: var(--green-bright); }
.header-subtitle { font-size: 1rem; opacity: 0.85; max-width: 600px; margin: 0 auto; }
.header-badge {
  display: inline-block;
  background: var(--green-bright);
  color: var(--navy-dark);
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 0.75rem;
}

/* ============ DATA STATUS ============ */
.data-status {
  font-size: 0.8rem;
  color: var(--text-mid);
  text-align: center;
  padding: 0.5rem;
  background: var(--bg-light);
  border-bottom: 1px solid var(--green-pale);
}

/* ============ FILTERS ============ */
.filters {
  background: var(--white);
  padding: 1.25rem 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
  box-shadow: 0 2px 20px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border: 2px solid var(--green-pale);
  background: var(--white);
  color: var(--navy-mid);
  border-radius: 50px;
  cursor: pointer;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.filter-btn:hover { background: var(--green-pale); border-color: var(--green-mid); }
.filter-btn.active { background: var(--navy-dark); border-color: var(--navy-dark); color: var(--green-bright); }

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-light);
  border-radius: 50px;
  padding: 0.5rem 1rem;
  margin-left: auto;
  border: 2px solid transparent;
}

.search-box:focus-within { border-color: var(--green-mid); background: var(--white); }

.search-box input {
  border: none;
  background: transparent;
  padding: 0.3rem 0.5rem;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.95rem;
  width: 200px;
  outline: none;
}

/* ============ MAIN CONTENT ============ */
.main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  min-height: calc(100vh - 300px);
}

.section-title {
  font-size: 1.8rem;
  color: var(--navy-dark);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 30px;
  background: linear-gradient(to bottom, var(--green-bright), var(--cyan-accent));
  border-radius: 2px;
}

/* ============ TRIP CARDS ============ */
.trips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.trip-card {
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  border: 1px solid rgba(74, 222, 128, 0.1);
}

.trip-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px var(--shadow-strong);
  border-color: var(--green-mid);
}

.trip-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green-bright), var(--cyan-accent));
}

.card-header { padding: 1.5rem 1.5rem 1rem; position: relative; }

.card-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--green-pale);
  color: var(--navy-dark);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.card-badge.expedition { background: var(--navy-dark); color: var(--green-bright); }
.card-grade { font-size: 0.85rem; color: var(--green-mid); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem; }
.card-title { font-size: 1.4rem; color: var(--navy-dark); margin-bottom: 0.5rem; line-height: 1.3; }
.card-theme { color: var(--text-mid); font-style: italic; font-size: 0.95rem; }
.card-body { padding: 0 1.5rem 1.5rem; }
.card-info { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 1rem; }
.info-item { display: flex; align-items: center; gap: 0.4rem; font-size: 0.9rem; color: var(--text-mid); }
.info-icon { color: var(--green-mid); }

.card-footer {
  background: linear-gradient(to right, var(--navy-dark), var(--navy-mid));
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-sdg { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--green-light); font-weight: 500; }
.view-details { color: var(--green-bright); font-weight: 600; font-size: 0.9rem; display: flex; align-items: center; gap: 0.3rem; }

/* ============ MODAL ============ */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10, 22, 40, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.open { opacity: 1; visibility: visible; }

.modal {
  background: var(--white);
  border-radius: 20px;
  max-width: 1000px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid var(--green-mid);
}

.modal-overlay.open .modal { transform: translateY(0) scale(1); }

.modal-header {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy-mid) 100%);
  color: var(--white);
  padding: 2rem;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(74, 222, 128, 0.2);
  border: none;
  color: var(--green-bright);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover { background: rgba(74, 222, 128, 0.4); }
.modal-grade { font-size: 0.9rem; color: var(--green-bright); text-transform: uppercase; letter-spacing: 0.1em; }
.modal-title { font-size: 2rem; margin-bottom: 0.5rem; }
.modal-meta { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-top: 1rem; font-size: 0.95rem; color: var(--green-light); }
.modal-body { padding: 2rem; background: var(--bg-light); }

.modal-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--green-pale);
  padding-bottom: 0.5rem;
  overflow-x: auto;
}

.tab-btn {
  padding: 0.6rem 1.2rem;
  border: none;
  background: none;
  color: var(--text-mid);
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 8px;
  white-space: nowrap;
}

.tab-btn:hover { background: var(--green-pale); }
.tab-btn.active { background: var(--navy-dark); color: var(--green-bright); }

.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }

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

/* ============ FLIP CARD ============ */
.flip-btn {
  position: absolute;
  top: 1rem;
  right: 3.5rem;
  background: rgba(74, 222, 128, 0.2);
  border: 2px solid var(--green-bright);
  color: var(--green-bright);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 10;
}

.flip-btn:hover { background: rgba(74, 222, 128, 0.4); transform: rotate(180deg); }

.local-badge {
  display: inline-block;
  background: #f59e0b;
  color: #1a1a2e;
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 0.75rem;
  vertical-align: middle;
}

.main-badge {
  display: inline-block;
  background: var(--green-bright);
  color: var(--navy-dark);
  padding: 0.3rem 0.75rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-left: 0.75rem;
  vertical-align: middle;
}

/* ============ ITINERARY ============ */
.itinerary-timeline { position: relative; padding-left: 2rem; }

.itinerary-day {
  position: relative;
  padding-bottom: 1.5rem;
  border-left: 3px solid var(--green-light);
  padding-left: 1.5rem;
  margin-left: 0.5rem;
}

.itinerary-day:last-child { border-left-color: transparent; }

.itinerary-day::before {
  content: '';
  position: absolute;
  left: -0.6rem;
  top: 0;
  width: 1rem;
  height: 1rem;
  background: var(--navy-dark);
  border-radius: 50%;
  border: 3px solid var(--white);
  box-shadow: 0 0 0 3px var(--green-mid);
}

.day-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.day-number { background: var(--navy-dark); color: var(--green-bright); padding: 0.25rem 0.75rem; border-radius: 50px; font-size: 0.85rem; font-weight: 600; }
.day-title { font-weight: 600; color: var(--navy-dark); }
.day-activities { background: var(--white); padding: 1rem; border-radius: 12px; margin-top: 0.5rem; border: 1px solid var(--green-pale); }
.activity-item { display: flex; gap: 0.75rem; padding: 0.5rem 0; border-bottom: 1px solid var(--green-pale); }
.activity-item:last-child { border-bottom: none; }
.activity-time { font-weight: 600; color: var(--green-mid); min-width: 80px; }
.activity-desc { color: var(--text-mid); }

/* ============ PACKING & EDUCATIONAL ============ */
.packing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.packing-category { background: var(--white); padding: 1.25rem; border-radius: 12px; border-left: 4px solid var(--green-mid); }
.packing-category h4 { color: var(--navy-dark); font-size: 1rem; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem; }
.packing-items { list-style: none; }
.packing-items li { padding: 0.4rem 0; color: var(--text-mid); display: flex; align-items: center; gap: 0.5rem; }
.packing-items li::before { content: '✓'; color: var(--green-mid); font-weight: bold; }

.edu-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.edu-card { background: var(--white); padding: 1.25rem; border-radius: 12px; border-left: 4px solid var(--green-mid); }
.edu-card h4 { color: var(--navy-dark); font-size: 0.9rem; margin-bottom: 0.5rem; text-transform: uppercase; }
.edu-card p { color: var(--text-dark); font-size: 1.1rem; font-weight: 500; }

/* ============ LOGISTICS & CONTACTS ============ */
.logistics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.logistics-card { background: var(--white); padding: 1.25rem; border-radius: 12px; border: 1px solid var(--green-pale); }
.logistics-card h4 { color: var(--navy-dark); margin-bottom: 0.75rem; }
.logistics-item { display: flex; justify-content: space-between; padding: 0.5rem 0; border-bottom: 1px solid var(--green-pale); }
.logistics-item:last-child { border-bottom: none; }

.contact-card {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy-mid));
  color: var(--white);
  padding: 1.25rem;
  border-radius: 12px;
  position: relative;
}

.contact-card h4 { margin-bottom: 0.5rem; color: var(--green-bright); }
.contact-info { opacity: 0.9; font-size: 0.95rem; }
.emergency-badge { position: absolute; top: 0.75rem; right: 0.75rem; background: #ef4444; color: white; padding: 0.2rem 0.5rem; border-radius: 4px; font-size: 0.7rem; font-weight: 600; }

/* ============ FAQ ============ */
.faq-item { background: var(--white); border-radius: 12px; margin-bottom: 1rem; overflow: hidden; border: 1px solid var(--green-pale); }
.faq-question { padding: 1rem 1.25rem; font-weight: 600; color: var(--navy-dark); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-question:hover { background: var(--green-pale); }
.faq-answer { padding: 0 1.25rem 1rem; color: var(--text-mid); display: none; }
.faq-item.open .faq-answer { display: block; }

/* ============ CHATBOT ============ */
.chatbot-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy-dark), var(--navy-mid));
  border: 2px solid var(--green-bright);
  cursor: pointer;
  box-shadow: 0 4px 20px var(--shadow-strong);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.chatbot-toggle:hover { transform: scale(1.1); box-shadow: 0 0 20px rgba(74, 222, 128, 0.4); }
.chatbot-toggle svg { width: 28px; height: 28px; fill: var(--green-bright); }

.chatbot-toggle .ai-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  background: var(--green-bright);
  color: var(--navy-dark);
  font-size: 0.6rem;
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 600;
}

.chatbot-window {
  position: fixed;
  bottom: 100px;
  right: 24px;
  width: 400px;
  max-width: calc(100vw - 48px);
  height: 550px;
  max-height: calc(100vh - 140px);
  background: var(--white);
  border-radius: 20px;
  box-shadow: 0 10px 50px rgba(10, 22, 40, 0.3);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.95);
  transition: all 0.3s ease;
  border: 1px solid var(--green-mid);
}

.chatbot-window.open { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }

.chatbot-header {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy-mid));
  color: var(--white);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.chatbot-avatar { width: 44px; height: 44px; background: var(--navy-dark); border-radius: 12px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.chatbot-avatar svg { width: 40px; height: 40px; }
.chatbot-title { flex: 1; }
.chatbot-title h3 { font-size: 1rem; font-weight: 600; display: flex; align-items: center; gap: 0.5rem; color: var(--green-bright); }
.chatbot-title .ai-tag { background: var(--green-bright); color: var(--navy-dark); font-size: 0.65rem; padding: 2px 6px; border-radius: 8px; }
.chatbot-title span { font-size: 0.75rem; color: var(--green-light); }
.chatbot-close { background: rgba(74, 222, 128, 0.2); border: none; color: var(--green-bright); width: 32px; height: 32px; border-radius: 50%; cursor: pointer; }
.chatbot-close:hover { background: rgba(74, 222, 128, 0.4); }

.chatbot-messages { flex: 1; overflow-y: auto; padding: 1rem; display: flex; flex-direction: column; gap: 0.75rem; background: var(--bg-light); }
.chat-message { max-width: 85%; padding: 0.75rem 1rem; border-radius: 16px; font-size: 0.9rem; line-height: 1.5; }
.chat-message.bot { background: var(--white); color: var(--text-dark); align-self: flex-start; border-bottom-left-radius: 4px; border: 1px solid var(--green-pale); }
.chat-message.user { background: linear-gradient(135deg, var(--navy-dark), var(--navy-mid)); color: var(--green-bright); align-self: flex-end; border-bottom-right-radius: 4px; }
.chat-message.error { background: #FFEBEE; color: #C62828; align-self: flex-start; }

.chat-suggestions { display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 0.5rem 1rem; border-top: 1px solid var(--green-pale); background: var(--white); }
.chat-suggestion { background: var(--green-pale); color: var(--navy-dark); border: none; padding: 0.4rem 0.75rem; border-radius: 50px; font-size: 0.8rem; cursor: pointer; font-family: 'Source Sans 3', sans-serif; }
.chat-suggestion:hover { background: var(--green-light); }

.chatbot-input { display: flex; padding: 0.75rem; border-top: 1px solid var(--green-pale); gap: 0.5rem; background: var(--white); }
.chatbot-input input { flex: 1; border: 2px solid var(--green-pale); border-radius: 50px; padding: 0.6rem 1rem; font-family: 'Source Sans 3', sans-serif; font-size: 0.9rem; outline: none; }
.chatbot-input input:focus { border-color: var(--green-mid); }
.chatbot-input button { background: linear-gradient(135deg, var(--navy-dark), var(--navy-mid)); border: none; color: var(--green-bright); width: 42px; height: 42px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.chatbot-input button:disabled { opacity: 0.5; }

.typing-indicator { display: flex; gap: 4px; padding: 0.75rem 1rem; background: var(--white); border-radius: 16px; align-self: flex-start; border: 1px solid var(--green-pale); }
.typing-indicator span { width: 8px; height: 8px; background: var(--green-mid); border-radius: 50%; animation: typing 1.4s infinite ease-in-out; }
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing { 0%, 60%, 100% { transform: translateY(0); } 30% { transform: translateY(-6px); } }

/* ============ LOADING ============ */
.loading { text-align: center; padding: 4rem 2rem; }
.loading-spinner { width: 50px; height: 50px; border: 4px solid var(--green-pale); border-top-color: var(--green-mid); border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 1rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.no-data { text-align: center; padding: 2rem; color: var(--text-light); font-style: italic; }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .filters { padding: 1rem; }
  .filter-btn { padding: 0.5rem 1rem; font-size: 0.85rem; }
  .search-box { width: 100%; margin: 0; }
  .search-box input { width: 100%; }
  .trips-grid { grid-template-columns: 1fr; }
  .modal { margin: 0.5rem; max-height: 95vh; }
  .chatbot-window { bottom: 0; right: 0; left: 0; width: 100%; max-width: 100%; height: 75vh; border-radius: 20px 20px 0 0; }
  .chatbot-toggle { bottom: 16px; right: 16px; }
}