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

:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --text: #1e1e2e;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --sidebar-width: 240px;
  --navbar-height: 56px;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
  --transition: 0.2s ease;
}

html {
  font-size: 15px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  font-family: inherit;
}

/* ── Login Page ──────────────────────────────────────────── */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 3rem 2.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.login-card h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.login-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.5;
}

.login-card .icon {
  width: 56px;
  height: 56px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.login-card .icon svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  width: 100%;
}

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

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.login-status {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  min-height: 1.5em;
}

.login-status.success {
  color: #059669;
}

.login-status.error {
  color: #dc2626;
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ── Navbar ───────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 100;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.navbar-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-brand svg {
  width: 22px;
  height: 22px;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.navbar-user {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.4rem 1rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-logout:hover {
  border-color: #dc2626;
  color: #dc2626;
}

/* ── Layout ───────────────────────────────────────────────── */
.app-layout {
  display: flex;
  padding-top: var(--navbar-height);
  min-height: 100vh;
}

/* ── Sidebar ──────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.5rem 0;
  position: fixed;
  top: var(--navbar-height);
  bottom: 0;
  overflow-y: auto;
}

.sidebar-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 0.75rem;
}

.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}

.sidebar-nav li a svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.sidebar-nav li a:hover {
  background: var(--bg);
  color: var(--text);
}

.sidebar-nav li a.active {
  background: #eef2ff;
  color: var(--primary);
  font-weight: 600;
}

/* ── Main Content ─────────────────────────────────────────── */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2rem;
}

.page-header {
  margin-bottom: 1.5rem;
}

.page-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
}

.page-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Card / Panel ─────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card-body {
  padding: 1.5rem;
}

/* ── Table ─────────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

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

thead th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

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

tbody td input {
  width: 100%;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

tbody td input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

/* ── Save Bar ──────────────────────────────────────────────── */
.save-bar {
  display: flex;
  justify-content: flex-end;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
}

.btn-save {
  background: var(--primary);
  color: #fff;
  padding: 0.6rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

.btn-save:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-save:active {
  transform: translateY(0);
}

.btn-save:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.save-status {
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  margin-right: 1rem;
}

.save-status.success {
  color: #059669;
}

.save-status.error {
  color: #dc2626;
}

/* ── Placeholder Pages ────────────────────────────────────── */
.placeholder-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
  color: var(--text-muted);
}

.placeholder-page svg {
  width: 64px;
  height: 64px;
  stroke: var(--border);
  fill: none;
  stroke-width: 1.2;
  margin-bottom: 1.5rem;
}

.placeholder-page h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.placeholder-page p {
  font-size: 0.9rem;
  max-width: 360px;
}

/* ── Activation page ──────────────────────────────────────── */
.activate-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.activate-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 3rem 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.activate-card h1 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.activate-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.activate-card .status-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.activate-card .status-icon.loading {
  background: #eef2ff;
}

.activate-card .status-icon.success {
  background: #d1fae5;
}

.activate-card .status-icon.error {
  background: #fee2e2;
}

.activate-card .status-icon svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.activate-card .status-icon.loading svg {
  stroke: var(--primary);
  animation: spin 0.8s linear infinite;
}

.activate-card .status-icon.success svg {
  stroke: #059669;
}

.activate-card .status-icon.error svg {
  stroke: #dc2626;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    display: none;
  }

  .main-content {
    margin-left: 0;
  }
}