/* ==================== RESET & VARIABLES ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --ink: #0a0a0a;
  --paper: #faf9f7;
  --accent: #e85d26;
  --accent-hover: #d14d1a;
  --accent-light: #fff0ea;
  --muted: #6b6560;
  --border: #e8e4df;
  --success: #22c55e;
  --success-light: #f0fdf4;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --sidebar-w: 240px;
}

body {
  font-family: 'DM Sans', sans-serif;
  background: #f0eeeb;
  color: var(--ink);
  line-height: 1.6;
  min-height: 100vh;
}

/* ==================== AUTH PAGES ==================== */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: white;
  border-radius: 16px;
  padding: 48px 40px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.04);
}

.auth-card .logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.8rem;
  letter-spacing: -0.5px;
  text-align: center;
  margin-bottom: 8px;
}

.auth-card .logo span { color: var(--accent); }

.auth-card .subtitle {
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

.auth-card h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
}

/* ==================== FORMS ==================== */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--ink);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  background: var(--paper);
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--ink);
  color: white;
}
.btn-primary:hover { background: #1a1a1a; transform: translateY(-1px); }

.btn-accent {
  background: var(--accent);
  color: white;
}
.btn-accent:hover { background: var(--accent-hover); transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--ink); background: var(--paper); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  padding: 8px 12px;
}
.btn-ghost:hover { color: var(--ink); background: var(--paper); }

.btn-success {
  background: var(--success);
  color: white;
}
.btn-success:hover { background: #16a34a; }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1.5px solid var(--danger);
}
.btn-danger:hover { background: var(--danger-light); }

.btn-sm {
  padding: 6px 14px;
  font-size: 0.82rem;
  border-radius: 8px;
}

.btn-full {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ==================== APP LAYOUT ==================== */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-w);
  background: var(--ink);
  color: white;
  padding: 28px 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar .logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  padding: 0 24px;
  margin-bottom: 36px;
}

.sidebar .logo span { color: var(--accent); }

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 12px;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.15s;
}

.sidebar-nav a:hover {
  color: white;
  background: rgba(255,255,255,0.08);
}

.sidebar-nav a.active {
  color: white;
  background: rgba(232,93,38,0.2);
}

.sidebar-nav a .nav-icon {
  font-size: 1.1rem;
  width: 24px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: auto;
}

.sidebar-user {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: 32px 40px;
  min-height: 100vh;
}

/* ==================== PAGE HEADER ==================== */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.page-header h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.8px;
}

.page-header .actions {
  display: flex;
  gap: 12px;
}

/* ==================== STAT CARDS ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: white;
  border-radius: 14px;
  padding: 24px;
  border: 1px solid var(--border);
}

.stat-card .label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 8px;
}

.stat-card .value {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.stat-card .value.success { color: var(--success); }
.stat-card .value.warning { color: var(--warning); }
.stat-card .value.danger { color: var(--danger); }
.stat-card .value.accent { color: var(--accent); }

/* ==================== CARDS ==================== */
.card {
  background: white;
  border-radius: 14px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 600;
}

.card-body {
  padding: 24px;
}

/* ==================== TABLES ==================== */
.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  text-align: left;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--paper);
}

.data-table td {
  padding: 14px 16px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: var(--paper);
}

.data-table .clickable {
  cursor: pointer;
}

/* ==================== BADGES ==================== */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-draft { background: var(--paper); color: var(--muted); border: 1px solid var(--border); }
.badge-sent { background: var(--accent-light); color: var(--accent); }
.badge-paid { background: var(--success-light); color: var(--success); }
.badge-overdue { background: var(--danger-light); color: var(--danger); }
.badge-pending { background: var(--warning-light); color: var(--warning); }
.badge-completed { background: var(--success-light); color: var(--success); }
.badge-active { background: var(--accent-light); color: var(--accent); }
.badge-in_progress { background: #eff6ff; color: #3b82f6; }

/* ==================== MODAL ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(2px);
  padding: 20px;
}

.modal {
  background: white;
  border-radius: 16px;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.modal-header {
  padding: 24px 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

.modal-body {
  padding: 24px 28px;
}

.modal-footer {
  padding: 0 28px 24px;
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 0.9rem;
  margin-bottom: 20px;
}

/* ==================== TOAST ==================== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--ink);
  color: white;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  animation: slideIn 0.3s ease;
  max-width: 380px;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ==================== FILTER BAR ==================== */
.filter-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 6px 16px;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: white;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}

.filter-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.filter-btn.active {
  background: var(--ink);
  color: white;
  border-color: var(--ink);
}

/* ==================== MILESTONE LIST ==================== */
.milestone-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.milestone-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: white;
  transition: transform 0.1s;
}

.milestone-item:hover {
  transform: translateX(2px);
}

.milestone-info {
  flex: 1;
}

.milestone-info h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.milestone-info p {
  font-size: 0.82rem;
  color: var(--muted);
}

.milestone-amount {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  color: var(--accent);
  white-space: nowrap;
}

.milestone-actions {
  display: flex;
  gap: 8px;
}

/* ==================== INVOICE DETAIL ==================== */
.invoice-preview {
  background: white;
  border-radius: 14px;
  padding: 40px;
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.invoice-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 36px;
}

.invoice-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

.invoice-meta-section h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--muted);
  margin-bottom: 6px;
}

.invoice-totals {
  display: flex;
  justify-content: flex-end;
  margin-top: 24px;
}

.invoice-totals-box {
  width: 260px;
}

.invoice-totals-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.95rem;
}

.invoice-totals-row.total {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  border-top: 2px solid var(--ink);
  padding-top: 12px;
  margin-top: 8px;
}

/* ==================== COPY LINK ==================== */
.copy-link-box {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 16px;
}

.copy-link-box input {
  flex: 1;
  padding: 8px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  background: var(--paper);
  color: var(--muted);
}

/* ==================== LOADING ==================== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--muted);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 12px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 900px) {
  .sidebar {
    display: none;
  }
  .main-content {
    margin-left: 0;
    padding: 20px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .page-header {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
  .auth-card {
    padding: 32px 24px;
  }
}

/* ==================== MOBILE NAV ==================== */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--ink);
  padding: 8px 0;
  z-index: 100;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.mobile-nav-inner {
  display: flex;
  justify-content: space-around;
}

.mobile-nav a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  font-size: 0.65rem;
  padding: 4px 8px;
}

.mobile-nav a.active {
  color: var(--accent);
}

.mobile-nav a .nav-icon {
  font-size: 1.2rem;
}

@media (max-width: 900px) {
  .mobile-nav {
    display: block;
  }
  .main-content {
    padding-bottom: 80px;
  }
}

/* ==================== SETTINGS GRID ==================== */
.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 768px) {
  .settings-grid {
    grid-template-columns: 1fr;
  }
}

/* ==================== DETAIL HEADER ==================== */
.detail-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.back-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--muted);
  padding: 4px;
}

.back-btn:hover { color: var(--ink); }