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

body {
  background: #f7f9fc;
  color: #333;
  padding: 24px 16px;
  line-height: 1.5;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  background: #ffffff;
  border-radius: 18px;
  box-shadow: 0 14px 36px rgba(0,0,0,0.14);
  overflow: hidden;
}

/* ── Tabs ── */
.tabs {
  display: flex;
  align-items: center;
  background: linear-gradient(90deg, #0d6efd 0%, #1075fe 100%);
  border-bottom: 1px solid #0b5ed7;
  flex-wrap: nowrap;
  min-height: 52px;
}

.tab {
  padding: 14px 16px;
  text-align: center;
  color: white;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.1px;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

.tab:hover:not(.active) { background: #0b58d4; transform: translateY(-1px); }
.tab.active { background: #0b5ed7; box-shadow: inset 0 -2px 0 0 #fff; }

.tab-spacer { flex: 1; }

.logged-in-badge {
  font-size: 12px;
  color: rgba(255,255,255,0.8);
  padding: 0 10px;
  white-space: nowrap;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.logout-btn {
  margin: 0 10px;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 6px;
  background: transparent;
  color: white;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
.logout-btn:hover { background: rgba(255,255,255,0.15); }

/* ── Panels ── */
.panel { padding: 26px 24px; display: none; }
.panel.active { display: block; }

/* ── Cards ── */
.card {
  background: #ffffff;
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  border: 1px solid #e0e5eb;
  margin-bottom: 20px;
  margin-top: 10px;
}

.card-light {
  background: #f9fbfe;
  border: 1px solid #dae1ea;
  border-radius: 10px;
  padding: 18px 20px;
  margin-bottom: 16px;
}

/* ── Auth panel ── */
.auth-wrap {
  max-width: 440px;
  margin: 0 auto;
  text-align: center;
  padding: 10px 0 20px;
}

.auth-logo {
  font-size: 48px;
  line-height: 1;
  margin-bottom: 16px;
}

.auth-card {
  text-align: left;
  margin-top: 20px;
}

/* ── Messages ── */
.msg {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 14px;
}

.msg.error {
  background: #fff0f0;
  border: 1px solid #f5c2c2;
  color: #c0392b;
}

.msg.success {
  background: #f0fdf4;
  border: 1px solid #a7f3c8;
  color: #166534;
}

/* ── Switch link ── */
.switch-link {
  margin-top: 16px;
  font-size: 13px;
  color: #666;
  text-align: center;
}

/* ── Password wrapper ── */
.pw-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.pw-wrap input {
  flex: 1;
  padding-right: 40px;
}

.pw-eye {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  padding: 0;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.45;
  line-height: 1;
  transition: opacity 0.2s;
}

.pw-eye:hover { opacity: 0.8; }

/* ── Hint text ── */
.hint {
  font-size: 11px;
  color: #999;
  margin-top: 3px;
}

.req { color: #e74c3c; }

/* ── Button row ── */
.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 6px;
}

/* ── Typography ── */
.title {
  font-size: 22px;
  margin-bottom: 8px;
  color: #1a1a1a;
  font-weight: 600;
}

.subtitle {
  color: #666;
  margin-bottom: 16px;
  line-height: 1.55;
  font-size: 14px;
}

/* ── Inputs ── */
.input-group { margin-bottom: 12px; }

label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
  color: #333;
  font-size: 14px;
}

.input-row { display: flex; gap: 12px; }
.input-row .input-group { flex: 1; }

input, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ced4da;
  border-radius: 8px;
  font-size: 14px;
  background: #f8f9fa;
  transition: all 0.2s;
}

input:focus, select:focus {
  outline: none;
  border-color: #0d6efd;
  box-shadow: 0 0 0 2px rgba(13,110,253,0.25);
  background: #ffffff;
}

/* ── Buttons ── */
button {
  padding: 9px 16px;
  border: none;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(90deg, #0d6efd 0%, #0a58ca 100%);
  color: white;
}

.btn-primary:hover { background: #0a58ca; transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  border: 1px solid #6c757d;
  color: #6c757d;
}

.btn-outline:hover { background: #f8f9fa; border-color: #495057; }

.btn-link {
  background: transparent;
  color: #0d6efd;
  padding: 4px 0;
  font-size: 13px;
  border: none;
}

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

/* ── Result ── */
.result {
  padding: 18px 20px;
  background: #e9f7ff;
  border-radius: 10px;
  border: 1px solid #b2e1ff;
  margin-top: 18px;
  border-left: 4px solid #0d6efd;
}

.result-title { font-size: 16px; margin-bottom: 6px; color: #084298; font-weight: 500; }
.result-text  { font-size: 17px; color: #0b58ca; font-weight: 600; margin-top: 6px; }

#chartCanvas {
  max-width: 100%;
  height: 300px;
  border-radius: 8px;
  border: 1px solid #e0e5eb;
  background: #f9fbfe;
}

/* ── Dark theme ── */
.theme-dark body      { background: #121212; color: #e0e0e0; }
.theme-dark .container{ background: #1f1f1f; box-shadow: 0 14px 36px rgba(0,0,0,0.4); }
.theme-dark .card     { background: #2c2c2c; border: 1px solid #3a3a3a; box-shadow: 0 4px 16px rgba(0,0,0,0.25); }
.theme-dark .card-light{ background: #252525; border: 1px solid #3a3a3a; }
.theme-dark input, .theme-dark select { background: #333; border-color: #4a4a4a; color: #e0e0e0; }
.theme-dark input:focus, .theme-dark select:focus { border-color: #0d6efd; box-shadow: 0 0 0 2px rgba(13,110,253,0.35); }
.theme-dark .result   { background: #203040; border: 1px solid #304060; border-left-color: #0d6efd; }
.theme-dark .result-title, .theme-dark .result-text { color: #e0f0ff; }
.theme-dark .msg.error  { background: #2a1010; border-color: #7a2020; color: #ffaaaa; }
.theme-dark .msg.success{ background: #0f2a1a; border-color: #1a5a30; color: #7dffaa; }
.theme-dark .title    { color: #f0f0f0; }
.theme-dark .subtitle { color: #aaa; }
.theme-dark label     { color: #ccc; }
.theme-dark .hint     { color: #777; }
.theme-dark .switch-link { color: #aaa; }
.theme-dark #chartCanvas { background: #252525; border-color: #3a3a3a; }