:root {
  color-scheme: light;
  --primary: #0f766e;
  --primary-dark: #0f4c4a;
  --accent: #f59e0b;
  --text: #0f172a;
  --muted: #64748b;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #ffffff;
  padding: 2.5rem 0 2rem;
}

.header-top,
.detail-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.brand h1 {
  margin: 0 0 0.4rem;
  font-size: 2.4rem;
}

.brand p {
  margin: 0;
  color: rgba(255, 255, 255, 0.85);
}

.developer-button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.12);
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.developer-button:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.24);
  border-color: rgba(255, 255, 255, 0.65);
}

.developer-button svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  flex-shrink: 0;
}

.search-panel {
  margin-top: 2rem;
  background: rgba(255, 255, 255, 0.15);
  padding: 1.5rem;
  border-radius: 1rem;
  backdrop-filter: blur(10px);
}

.search-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

#searchInput {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 0.6rem;
  border: 1px solid transparent;
  font-size: 1rem;
}

.filters {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  margin-top: 1rem;
}

.filters label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  gap: 0.4rem;
}

select {
  padding: 0.6rem 0.8rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
}

.summary {
  margin: 2rem 0 1rem;
  font-weight: 600;
  color: var(--muted);
}

.university-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin-bottom: 3rem;
}

.university-card {
  background: var(--card);
  border-radius: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.university-card h3 {
  margin: 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.12);
  color: var(--primary);
  font-weight: 600;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.tag-list li {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
}

.card-meta {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.card-link {
  margin-top: auto;
  text-decoration: none;
  color: var(--primary);
  font-weight: 600;
}

.card-link:hover {
  color: var(--primary-dark);
}

.detail-header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.back-link {
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
}

.detail-card {
  background: var(--card);
  border-radius: 1rem;
  padding: 2rem;
  border: 1px solid var(--border);
  margin: 2.5rem 0 3rem;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.detail-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.detail-logo {
  width: 120px;
  height: 120px;
  border-radius: 1rem;
  border: 1px solid var(--border);
  padding: 0.75rem;
  background: var(--bg);
  object-fit: contain;
}

.section-title {
  font-weight: 700;
  margin-top: 1.5rem;
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.info-list a {
  color: var(--primary);
  text-decoration: none;
}

.site-footer {
  padding: 2rem 0;
  background: #ffffff;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

@media (max-width: 720px) {
  .header-top,
  .detail-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .developer-button {
    max-width: 100%;
  }

  .search-panel {
    margin-top: 1.5rem;
  }

  .detail-card {
    padding: 1.5rem;
  }
}

/* Dashboard & Statistics Charts */
.dashboard-section {
  margin: 3rem 0;
}

.dashboard-section h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  color: var(--text);
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.5rem;
  display: inline-block;
}

.charts-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  margin-top: 1rem;
}

.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.chart-card h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.15rem;
  color: var(--text);
  align-self: flex-start;
}

.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 280px;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Community Feed Tabs */
.tabs-nav {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.tab-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--primary);
  background: rgba(15, 118, 110, 0.05);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--primary);
}

/* Header actions & Join Community button */
.header-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.join-community-btn {
  background: var(--accent) !important;
  border-color: var(--accent) !important;
  color: var(--text) !important;
}

.join-community-btn:hover {
  background: #d97706 !important;
}

/* Feed Layout */
.feed-layout {
  display: grid;
  gap: 2rem;
  grid-template-columns: 2fr 1fr;
  margin-top: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .feed-layout {
    grid-template-columns: 1fr;
  }
}

.feed-main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.feed-sidebar {
  position: sticky;
  top: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

/* Post Creator */
.post-creator textarea {
  width: 100%;
  min-height: 80px;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.75rem;
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  margin: 0.5rem 0;
  outline: none;
}

.post-creator textarea:focus {
  border-color: var(--primary);
}

.post-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.file-upload-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  border-radius: 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
  font-weight: 500;
}

.file-upload-label:hover {
  background: #f1f5f9;
  border-color: var(--muted);
}

.file-upload-label input {
  display: none;
}

.submit-post-btn {
  background: var(--primary);
  color: #ffffff;
  border: none;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

.submit-post-btn:hover {
  background: var(--primary-dark);
}

.file-preview {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--primary);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

/* Feed Auth Warning */
.feed-auth-warning {
  text-align: center;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* Feed Stream & Cards */
.feed-stream {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.feed-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feed-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.member-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: uppercase;
}

.feed-card-meta {
  display: flex;
  flex-direction: column;
}

.feed-card-meta .username {
  font-weight: 600;
  color: var(--text);
}

.feed-card-meta .timestamp {
  font-size: 0.75rem;
  color: var(--muted);
}

.feed-card-content {
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.post-media-img {
  max-width: 100%;
  max-height: 350px;
  border-radius: 0.6rem;
  object-fit: cover;
  margin-top: 0.5rem;
  border: 1px solid var(--border);
}

.post-doc-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: #fef3c7;
  border: 1px solid #fde68a;
  color: #92400e;
  border-radius: 0.6rem;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  transition: all 0.2s ease;
}

.post-doc-link:hover {
  background: #fde68a;
}

/* Interaction Bar */
.post-interaction-bar {
  display: flex;
  gap: 1.5rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 0.5rem 0;
  margin-top: 0.5rem;
}

.interaction-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.3rem;
  transition: all 0.2s ease;
}

.interaction-btn:hover {
  color: var(--primary);
  background: rgba(15, 118, 110, 0.05);
}

.interaction-btn.liked {
  color: #e11d48;
}

.interaction-btn.liked:hover {
  background: rgba(225, 29, 72, 0.05);
}

/* Comments Section */
.post-comments-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: var(--bg);
  padding: 1rem;
  border-radius: 0.8rem;
  margin-top: 0.25rem;
}

.comment-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 200px;
  overflow-y: auto;
}

.comment-item {
  font-size: 0.85rem;
  line-height: 1.4;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.4rem;
}

.comment-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.comment-item strong {
  color: var(--primary-dark);
}

.comment-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.comment-form input {
  flex-grow: 1;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  outline: none;
}

.comment-form input:focus {
  border-color: var(--primary);
}

.comment-form button {
  background: var(--primary);
  color: #ffffff;
  border: none;
  font-weight: 600;
  padding: 0.4rem 0.8rem;
  border-radius: 0.4rem;
  cursor: pointer;
  font-size: 0.85rem;
}

/* Members List Sidebar */
.members-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 400px;
  overflow-y: auto;
}

.member-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.member-info {
  display: flex;
  flex-direction: column;
}

.member-info .name {
  font-weight: 600;
}

.member-info .phone {
  font-size: 0.75rem;
  color: var(--muted);
}

/* Modal Overlay & Card */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  width: 90%;
  max-width: 400px;
  padding: 2rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  position: relative;
  animation: modalScale 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalScale {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.close-modal-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--muted);
}

.close-modal-btn:hover {
  color: var(--text);
}

.modal-tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.5rem;
}

.modal-tab {
  flex-grow: 1;
  background: none;
  border: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.5rem 0;
  cursor: pointer;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}

.modal-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Auth Forms */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
}

.form-group input {
  padding: 0.6rem 0.8rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  outline: none;
  font-family: inherit;
}

.form-group input:focus {
  border-color: var(--primary);
}

.auth-submit-btn {
  background: var(--primary);
  color: #ffffff;
  border: none;
  font-weight: 600;
  padding: 0.75rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background 0.2s ease;
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

.auth-submit-btn:hover {
  background: var(--primary-dark);
}

/* Visibility Utilities */
.hidden {
  display: none !important;
}

.directory-only.hidden {
  display: none !important;
}