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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #eef2ff;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
}

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

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 20px;
}

/* ==================== Pages ==================== */
.page {
  display: none;
}
.page.active {
  display: block;
}

/* ==================== Card ==================== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  margin-bottom: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-light);
}

/* ==================== Auth Page ==================== */
.title {
  font-size: 26px;
  text-align: center;
  margin-bottom: 8px;
  color: var(--primary);
}

.subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 28px;
  font-size: 14px;
}

.tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border);
}

.tab {
  flex: 1;
  padding: 10px;
  border: none;
  background: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.form {
  display: none;
}

.form.active {
  display: block;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group small {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-secondary);
}

.required {
  color: var(--danger);
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="time"] {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  background: #f8fafc;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
  background: #fff;
}

/* ==================== Radio ==================== */
.radio-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.radio {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 14px;
  padding: 8px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
}

.radio:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.radio input {
  accent-color: var(--primary);
}

/* ==================== Step Range ==================== */
.step-range {
  display: flex;
  align-items: center;
  gap: 10px;
}

.step-range > div {
  flex: 1;
}

.step-range input {
  width: 100%;
}

.range-sep {
  font-size: 20px;
  color: var(--text-secondary);
  margin-top: 20px;
}

/* ==================== Buttons ==================== */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
  background: var(--primary-light);
}

/* ==================== Messages ==================== */
.form-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 10px;
  text-align: center;
}

.form-success {
  color: var(--success);
  font-size: 13px;
  margin-top: 10px;
  text-align: center;
}

.form-message {
  font-size: 13px;
  margin: 8px 0;
  padding: 8px 12px;
  border-radius: 6px;
}

.form-message.success {
  background: #f0fdf4;
  color: #15803d;
}

.form-message.error {
  background: #fef2f2;
  color: #b91c1c;
}

.form-message.info {
  background: #eff6ff;
  color: #1d4ed8;
}

/* ==================== Header ==================== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding: 16px 0;
}

.header h1 {
  font-size: 22px;
  color: var(--primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

#current-user {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ==================== Hidden ==================== */
.hidden {
  display: none !important;
}

/* ==================== Logs ==================== */
.logs-list {
  max-height: 300px;
  overflow-y: auto;
  margin-top: 12px;
}

.log-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: #f8fafc;
  border-radius: 8px;
  margin-bottom: 8px;
  font-size: 13px;
}

.log-item .log-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.log-item .log-step {
  font-weight: 600;
  color: var(--primary);
}

.log-item .log-time {
  color: var(--text-secondary);
  font-size: 12px;
}

.log-status {
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.log-status.success {
  background: #f0fdf4;
  color: #15803d;
}

.log-status.failed {
  background: #fef2f2;
  color: #b91c1c;
}

.text-muted {
  color: var(--text-secondary);
  text-align: center;
  font-size: 14px;
}

/* ==================== Loading ==================== */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ==================== Responsive ==================== */
@media (max-width: 480px) {
  .card {
    padding: 20px 16px;
  }
  .step-range {
    flex-direction: column;
    gap: 0;
  }
  .range-sep {
    text-align: center;
    margin-top: 0;
  }
}