:root {
  --ink: #1a2233;
  --ink-soft: #566072;
  --accent: #2952e3;
  --accent-dark: #1d3cb8;
  --bg: #f4f6fb;
  --card-bg: #ffffff;
  --border: #dde2ec;
  --danger: #c0392b;
  --success: #1e7e42;
  --font-body: "DM Sans", sans-serif;
  --sidebar-width: 220px;
  --sidebar-width-collapsed: 64px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
}

h1, h2, h3 { margin: 0 0 8px; font-weight: 700; }
p { margin: 0 0 12px; line-height: 1.5; }

.btn {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
}

.btn:disabled { cursor: not-allowed; opacity: 0.55; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); }

.btn-secondary {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--border);
}

/* Auth screens */
.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 40px;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-subtitle { color: var(--ink-soft); font-size: 14px; margin-top: -8px; }

.auth-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
}

.auth-card input {
  font-family: var(--font-body);
  font-size: 15px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.auth-error { color: var(--danger); font-size: 13px; margin: 0; }
.auth-success { color: var(--success); font-size: 13px; margin: 0; }

.link-btn {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  align-self: flex-start;
}

.link-btn:hover { text-decoration: underline; }

.password-requirements {
  list-style: none;
  margin: -8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.password-requirements li {
  font-size: 13px;
  color: var(--ink-soft);
  padding-left: 22px;
  position: relative;
}

.password-requirements li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: #fff;
}

.password-requirements li.met {
  color: var(--success);
}

.password-requirements li.met::before {
  border-color: var(--success);
  background: var(--success);
}

.password-requirements li.met::after {
  content: "";
  position: absolute;
  left: 4.5px;
  top: 5px;
  width: 5px;
  height: 8px;
  border: solid #fff;
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

/* App shell */
.app-shell { min-height: 100vh; }

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: var(--ink);
  color: #fff;
}

.app-title { font-weight: 700; font-size: 16px; }

.app-header-right { display: flex; align-items: center; gap: 16px; }
.session-email { font-size: 13px; color: #c7cee0; }

.app-header .btn-ghost {
  color: #e4e8f5;
  border-color: rgba(255, 255, 255, 0.3);
}

.app-header .btn-ghost:hover { background: rgba(255, 255, 255, 0.08); }

.app-body {
  display: flex;
  align-items: flex-start;
  min-height: calc(100vh - 61px);
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  background: #fff;
  border-right: 1px solid var(--border);
  min-height: calc(100vh - 61px);
  transition: width 0.18s ease;
}

.sidebar.collapsed { width: var(--sidebar-width-collapsed); }

.sidebar-toggle {
  align-self: flex-end;
  background: none;
  border: none;
  color: var(--ink-soft);
  cursor: pointer;
  padding: 8px;
  margin-bottom: 8px;
  border-radius: 6px;
  transition: transform 0.18s ease;
}

.sidebar-toggle:hover { background: var(--bg); }
.sidebar-toggle.rotated { transform: rotate(180deg); }
.sidebar.collapsed .sidebar-toggle { align-self: center; }

.tab-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 14px;
  background: none;
  border: none;
  border-radius: 8px;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
}

.tab-btn .nav-icon { flex-shrink: 0; }

.tab-btn:hover { background: var(--bg); }
.tab-btn.active { color: var(--accent); background: #eef1fd; }

.sidebar.collapsed .tab-btn { justify-content: center; padding: 12px; }
.sidebar.collapsed .nav-label { display: none; }

.tab-panels { flex: 1; padding: 32px; max-width: 900px; margin: 0 auto; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-subtitle { color: var(--ink-soft); }
.panel-note { color: var(--ink-soft); font-size: 13px; }

/* Upload */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 40px;
  text-align: center;
  background: var(--card-bg);
}

.dropzone.dragover { border-color: var(--accent); background: #eef1fd; }

.file-btn { display: inline-block; margin-top: 8px; }

.selected-file { margin-top: 12px; font-size: 13px; color: var(--ink-soft); }

.preview-wrap {
  margin-top: 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}

.preview-summary { font-size: 13px; color: var(--ink-soft); }

.table-scroll { overflow-x: auto; margin-bottom: 16px; }

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

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  white-space: nowrap;
}

th { background: #f0f2f8; font-weight: 700; }

.upload-report { margin-top: 24px; }

.empty-state {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 48px;
  text-align: center;
  color: var(--ink-soft);
}

@media (max-width: 700px) {
  .app-header { padding: 16px; flex-wrap: wrap; gap: 8px; }
  .tab-panels { padding: 20px; }
  .auth-card { padding: 28px; }
}