/* ============================================
   SISTEMA DE GESTIÓN DE CAMBIOS - Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---- CSS Variables ---- */
:root {
  --bg-base: #0d0f17;
  --bg-surface: #141720;
  --bg-card: #1c2030;
  --bg-card-hover: #222840;
  --bg-elevated: #252b3b;
  --border: #2a3045;
  --border-light: #333d55;

  --accent: #6c63ff;
  --accent-light: #8b84ff;
  --accent-dark: #5248cc;
  --accent-glow: rgba(108,99,255,0.25);

  --success: #22c55e;
  --success-bg: rgba(34,197,94,0.12);
  --warning: #f59e0b;
  --warning-bg: rgba(245,158,11,0.12);
  --danger: #ef4444;
  --danger-bg: rgba(239,68,68,0.12);
  --info: #38bdf8;
  --info-bg: rgba(56,189,248,0.12);

  --text-primary: #e8eaf2;
  --text-secondary: #8892a4;
  --text-muted: #56607a;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.6);
  --shadow-accent: 0 4px 24px rgba(108,99,255,0.3);

  --transition: 0.2s ease;
  --sidebar-width: 240px;
}

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

html { font-size: 14px; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-light); text-decoration: none; }
a:hover { color: var(--accent); }

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

/* ---- Sidebar ---- */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  overflow-y: auto;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 18px;
  border-bottom: 1px solid var(--border);
}

.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}

.logo-text {
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}
.logo-sub {
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 400;
}

.sidebar-section {
  padding: 14px 10px 6px;
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 8px;
  margin-bottom: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 2px;
  text-decoration: none;
}

.nav-item:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(108,99,255,0.15);
  color: var(--accent-light);
  border-left: 3px solid var(--accent);
  padding-left: 9px;
}

.nav-item .icon { font-size: 16px; min-width: 18px; }

.nav-badge {
  margin-left: auto;
  background: var(--accent);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 20px;
  min-width: 18px;
  text-align: center;
}

.sidebar-footer {
  margin-top: auto;
  padding: 14px 10px;
  border-top: 1px solid var(--border);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
}
.user-info:hover { background: var(--bg-card); }

.user-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6c63ff, #f093fb);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 12px;
  color: white;
  flex-shrink: 0;
}

.user-name { font-size: 12px; font-weight: 600; color: var(--text-primary); }
.user-role { font-size: 10px; color: var(--text-muted); }

/* ---- Main Content ---- */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---- Topbar ---- */
.topbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-left { display: flex; align-items: center; gap: 12px; }
.page-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.page-subtitle { font-size: 12px; color: var(--text-secondary); }

.topbar-actions { display: flex; align-items: center; gap: 10px; }

.page-body {
  padding: 28px;
  flex: 1;
}

/* ============================================
   COMPONENTS
   ============================================ */

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  box-shadow: var(--shadow-accent);
}
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-1px); }

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover { background: var(--bg-card-hover); border-color: var(--accent); }

.btn-success {
  background: var(--success);
  color: white;
}
.btn-success:hover { filter: brightness(1.1); transform: translateY(-1px); }

.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-danger:hover { filter: brightness(1.1); transform: translateY(-1px); }

.btn-warning {
  background: var(--warning);
  color: #0d0f17;
}
.btn-warning:hover { filter: brightness(1.05); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-card); color: var(--text-primary); }

.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  transition: all var(--transition);
}
.btn-icon:hover { background: var(--bg-card-hover); color: var(--text-primary); }

/* ---- Cards ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.card-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ---- Badges / Status ---- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}

.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

.badge-pending { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-pending::before { background: var(--warning); }

.badge-progress { background: var(--info-bg); color: var(--info); }
.badge-progress::before { background: var(--info); }

.badge-approved { background: var(--success-bg); color: var(--success); }
.badge-approved::before { background: var(--success); }

.badge-rejected { background: var(--danger-bg); color: var(--danger); }
.badge-rejected::before { background: var(--danger); }

.badge-closed { background: rgba(86,96,122,0.2); color: var(--text-muted); }
.badge-closed::before { background: var(--text-muted); }

.badge-major { background: rgba(239,68,68,0.1); color: #f87171; border: 1px solid rgba(239,68,68,0.2); }
.badge-minor { background: rgba(34,197,94,0.1); color: #4ade80; border: 1px solid rgba(34,197,94,0.2); }

/* ---- Stat Cards ---- */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition);
}
.stat-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-accent); }

.stat-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-change {
  font-size: 11px;
  font-weight: 600;
}
.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* ---- Tables ---- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead {
  background: var(--bg-elevated);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

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

tbody tr {
  transition: background var(--transition);
}
tbody tr:hover { background: var(--bg-card-hover); }

/* ---- Forms ---- */
.form-group { margin-bottom: 18px; }

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-label .required { color: var(--danger); margin-left: 3px; }

.form-control {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: 'Inter', sans-serif;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-control::placeholder { color: var(--text-muted); }

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

select.form-control { cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238892a4' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-hint { font-size: 11px; color: var(--text-muted); margin-top: 5px; }

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

.form-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
}

/* ---- File Upload ---- */
.file-upload {
  border: 2px dashed var(--border-light);
  border-radius: var(--radius);
  padding: 30px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-elevated);
}

.file-upload:hover {
  border-color: var(--accent);
  background: rgba(108,99,255,0.05);
}

.file-upload-icon { font-size: 32px; margin-bottom: 10px; }
.file-upload-text { font-size: 13px; color: var(--text-secondary); }
.file-upload-text strong { color: var(--accent-light); }
.file-upload-hint { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

/* ---- Progress / Timeline ---- */
.progress-track {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 20px 0 10px;
  overflow-x: auto;
}

.progress-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  position: relative;
}

.progress-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 15px;
  left: 50%;
  width: 100%;
  height: 2px;
  background: var(--border);
  z-index: 0;
}

.progress-step.done:not(:last-child)::after { background: var(--accent); }

.step-circle {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  z-index: 1;
  position: relative;
  transition: all var(--transition);
}

.progress-step.done .step-circle {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.progress-step.current .step-circle {
  background: var(--bg-elevated);
  border-color: var(--accent);
  color: var(--accent-light);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.step-label {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 7px;
  text-align: center;
  font-weight: 500;
  max-width: 72px;
  line-height: 1.3;
}

.progress-step.done .step-label,
.progress-step.current .step-label {
  color: var(--text-secondary);
}

/* ---- Notification ---- */
.notif-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  cursor: pointer;
}
.notif-item:hover { background: var(--bg-card-hover); }
.notif-item.unread { background: rgba(108,99,255,0.06); }

.notif-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 5px;
  flex-shrink: 0;
}

.notif-text { font-size: 12px; color: var(--text-secondary); line-height: 1.5; }
.notif-text strong { color: var(--text-primary); }
.notif-time { font-size: 10px; color: var(--text-muted); margin-top: 3px; }

/* ---- Grid Layouts ---- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

/* ---- Detail Item ---- */
.detail-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.detail-row:last-child { border-bottom: none; }
.detail-key { font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.detail-value { font-size: 13px; color: var(--text-primary); }

/* ---- Section title ---- */
.section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ---- Empty state ---- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-muted);
  text-align: center;
}
.empty-state-icon { font-size: 48px; margin-bottom: 14px; opacity: 0.5; }
.empty-state-text { font-size: 14px; font-weight: 600; color: var(--text-secondary); }
.empty-state-hint { font-size: 12px; margin-top: 6px; }

/* ---- Misc helpers ---- */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.mt-1 { margin-top: 6px; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 18px; }
.mt-4 { margin-top: 24px; }
.mb-2 { margin-bottom: 12px; }
.mb-3 { margin-bottom: 18px; }
.mb-4 { margin-bottom: 24px; }
.text-sm { font-size: 12px; }
.text-xs { font-size: 11px; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent-light); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-bold { font-weight: 700; }
.font-mono { font-family: 'JetBrains Mono', 'Fira Code', monospace; }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }