:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --border-focus: #3b82f6;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --info: #0284c7;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  overflow-x: clip;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Nav */
header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  min-height: 60px;
  flex-wrap: wrap;
  gap: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-badge {
  background: var(--primary);
  color: white;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.logo-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  flex-wrap: wrap;
}

.nav-btn {
  background: none;
  border: none;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.nav-btn:hover {
  background: #f1f5f9;
  color: var(--text-main);
}

.nav-btn.active {
  background: #eff6ff;
  color: var(--primary);
  font-weight: 600;
}

.user-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-badge {
  font-size: 0.85rem;
  color: var(--text-muted);
  background: #f1f5f9;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
}

/* Main Container */
main {
  flex: 1;
  padding: 1.5rem;
  max-width: 1440px;
  margin: 0 auto;
  width: 100%;
}

/* Common UI Elements */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  margin-bottom: 1rem;
}

.card-title {
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: white;
  border-color: var(--border);
  color: var(--text-main);
}
.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-danger:hover {
  background: #b91c1c;
}

.btn-success {
  background: var(--success);
  color: white;
}
.btn-success:hover {
  background: #15803d;
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-draft { background: #f1f5f9; color: #475569; }
.badge-pending_review { background: #fef3c7; color: #b45309; }
.badge-approved { background: #dcfce7; color: #15803d; }
.badge-returned { background: #fee2e2; color: #b91c1c; }
.badge-revoked { background: #f3e8ff; color: #7e22ce; }

.badge-parsed { background: #dcfce7; color: #15803d; }
.badge-partial { background: #fef3c7; color: #b45309; }
.badge-unsupported { background: #e0f2fe; color: #0369a1; }
.badge-failed { background: #fee2e2; color: #b91c1c; }
.badge-image_stored_no_vision { background: #ffedd5; color: #c2410c; }

/* Grid / Flex */
.grid-cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.grid-cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

/* Forms */
.form-group {
  margin-bottom: 0.85rem;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

input[type="text"], input[type="password"], input[type="number"], input[type="search"], select, textarea {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--text-main);
  background: white;
  transition: border-color 0.15s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

textarea {
  min-height: 80px;
  resize: vertical;
}

/* Project Workspace 3-Column Layout */
.workspace-container {
  display: grid;
  grid-template-columns: minmax(220px, 0.85fr) minmax(340px, 1.6fr) minmax(260px, 1fr);
  gap: 1rem;
  height: calc(100vh - 120px);
}

.workspace-col {
  min-width: 0;
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.col-header {
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: #f8fafc;
  font-weight: 600;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.col-body {
  padding: 1rem;
  flex: 1;
  overflow-y: auto;
}

/* Chat Component */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.chat-bubble {
  max-width: 90%;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  font-size: 0.875rem;
  line-height: 1.45;
  word-break: break-word;
}

.chat-bubble.assistant {
  align-self: flex-start;
  background: #f1f5f9;
  color: #1e293b;
  border: 1px solid #e2e8f0;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--primary);
  color: white;
}

.chat-input-bar {
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 0.5rem;
  background: white;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-content {
  background: white;
  border-radius: 10px;
  width: 100%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 600;
}

/* File list item */
.file-item {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem;
  margin-bottom: 0.5rem;
  background: #fcfcfd;
}

.file-header {
  flex-wrap: wrap;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}

.workspace-heading { flex-wrap: wrap; min-width: 0; }
.workspace-heading h2, .card, .form-group, .logo-area, .user-area { min-width: 0; overflow-wrap: anywhere; }
.grid-cols-2, .grid-cols-3 { min-width: 0; }
.grid-cols-2 > *, .grid-cols-3 > * { min-width: 0; }
.task-status { color: var(--text-muted); font-size: .85rem; white-space: pre-wrap; margin-bottom: .75rem; overflow-wrap: anywhere; }
.help-text { font-size: .8rem; color: var(--text-muted); margin: .5rem 0; line-height: 1.6; }
.source-text { white-space: pre-wrap; overflow-wrap: anywhere; font-size: .8rem; line-height: 1.6; max-height: 320px; overflow: auto; padding: .5rem; }
.section-label { font-size: .95rem; margin: 1rem 0 .5rem; }
details { border-top: 1px solid var(--border); padding: .75rem 0; font-size: .85rem; }
summary { cursor: pointer; overflow-wrap: anywhere; min-height: 32px; }
button:disabled { opacity: .55; cursor: not-allowed; }
@media (max-width: 1200px) { .logo-title { font-size: .95rem; } header { position: relative; padding-top: .5rem; padding-bottom: .5rem; } }

.file-name {
  font-weight: 500;
  font-size: 0.85rem;
  word-break: break-all;
}

.user-card { flex-wrap: wrap; gap: .75rem; }
.user-actions { flex-wrap: wrap; }
.user-actions button { white-space: nowrap; }
#phasesContainer + button, button[onclick="addPhaseCard()"] { white-space: nowrap; }

.file-reason {
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: 0.25rem;
}

/* Phase card */
.phase-card {
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  padding: 0.75rem;
  margin-bottom: 0.75rem;
  background: #f8fafc;
}

/* Responsive Breakpoints */
.project-list-message { color: var(--text-muted); text-align: center; padding: 2rem; overflow-wrap: anywhere; }
.project-list-message button { margin-top: 0.75rem; min-height: 44px; }
.model-picker-row, .settings-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.model-picker-row input { flex: 1 1 220px; min-width: 0; }
.model-picker-row button { flex: 0 0 auto; min-height: 44px; }
.settings-actions { margin-top: 1rem; }
.settings-actions button { min-height: 44px; }
.settings-help, .settings-feedback { font-size: 0.85rem; line-height: 1.5; margin-top: 0.5rem; color: var(--text-muted); overflow-wrap: anywhere; }
.settings-feedback { min-height: 1.5em; }
.model-picker { margin-top: 0.5rem; padding: 0.75rem; border: 1px solid var(--border); border-radius: 6px; background: var(--bg-main); min-width: 0; }
.model-picker input, .model-picker select { width: 100%; min-width: 0; max-width: 100%; min-height: 44px; }
.model-picker label:not(:first-child) { margin-top: 0.75rem; }

/* Tablet 1024px */
@media (max-width: 1024px) {
  .workspace-container {
    grid-template-columns: 280px 1fr;
    height: auto;
  }
  .workspace-col.chat-col {
    grid-column: span 2;
    height: 400px;
  }
  .grid-cols-3 {
    grid-template-columns: 1fr 1fr;
  }
}

/* Mobile 390px */
@media (max-width: 640px) {
  header {
    padding: 0 0.75rem;
    height: auto;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding-bottom: 0.5rem;
  }
  nav {
    width: 100%;
    order: 3;
    padding-bottom: 0.25rem;
  }
  main {
    padding: 0.75rem;
  }
  .workspace-container {
    display: flex;
    flex-direction: column;
    height: auto;
  }
  .grid-cols-2, .grid-cols-3 {
    grid-template-columns: 1fr;
  }
  .workspace-col {
    height: auto;
    min-height: 350px;
  }
  .mobile-hide {
    display: none !important;
  }
}