:root {
  /* ChatGPT-inspired neutrals + green accent */
  --drpf-bg: #f7f7f8;
  --drpf-surface: #ffffff;
  --drpf-text: #0f172a;
  --drpf-muted: #64748b;
  --drpf-border: #e5e7eb;
  --drpf-shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
  --drpf-radius: 14px;
  --drpf-radius-sm: 10px;
  --drpf-accent: #10a37f;
  --drpf-accent-ink: #ffffff;
  --drpf-focus: 0 0 0 4px rgba(16, 163, 127, 0.18);
  --drpf-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, system-ui, sans-serif;
}

/* Base */
html, body { height: 100%; }

body.drpf {
  margin: 0;
  font-family: var(--drpf-font);
  color: var(--drpf-text);
  background: var(--drpf-bg);
}

.drpf a { color: inherit; }
.drpf-muted { color: var(--drpf-muted); }

/* Layout */
.drpf-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

.drpf-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.drpf-card {
  background: var(--drpf-surface);
  border: 1px solid var(--drpf-border);
  border-radius: var(--drpf-radius);
  box-shadow: var(--drpf-shadow);
}

.drpf-card-header {
  padding: 14px 16px 10px 16px;
  border-bottom: 1px solid var(--drpf-border);
}

.drpf-card-body { padding: 16px; }

.drpf-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.drpf-subtitle {
  margin: 6px 0 0 0;
  font-size: 13px;
  color: var(--drpf-muted);
}

/* Forms */
.drpf-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 6px 0;
}

.drpf-input {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid var(--drpf-border);
  background: var(--drpf-surface);
  color: var(--drpf-text);
  border-radius: var(--drpf-radius-sm);
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}

.drpf-input:focus {
  border-color: rgba(16, 163, 127, 0.55);
  box-shadow: var(--drpf-focus);
}

.drpf-help {
  margin-top: 6px;
  font-size: 12px;
  color: var(--drpf-muted);
}

/* Buttons */
.drpf-btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--drpf-radius-sm);
  padding: 10px 12px;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.drpf-btn-primary {
  background: var(--drpf-accent);
  color: var(--drpf-accent-ink);
}

.drpf-btn-primary:focus {
  outline: none;
  box-shadow: var(--drpf-focus);
}

.drpf-btn-ghost {
  background: transparent;
  border-color: var(--drpf-border);
  color: var(--drpf-text);
}

.drpf-btn-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

/* Alerts */
.drpf-alert {
  border: 1px solid var(--drpf-border);
  border-radius: var(--drpf-radius-sm);
  padding: 12px;
  background: #fff;
}

.drpf-alert-success {
  border-color: rgba(16, 163, 127, 0.35);
  background: rgba(16, 163, 127, 0.06);
}

.drpf-alert-error {
  border-color: rgba(239, 68, 68, 0.35);
  background: rgba(239, 68, 68, 0.06);
}

/* Small helpers */
.drpf-topbar {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.drpf-nav {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.drpf-nav a { text-decoration: none; }
.drpf-nav a:hover { text-decoration: underline; }

/* Auth header mount */
.dpf-auth-header { display: inline-flex; align-items: center; }

.dpf-auth-panel {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--drpf-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 1px 1px rgba(15, 23, 42, 0.04);
}

.dpf-auth-panel .drpf-btn {
  padding: 8px 10px;
  font-size: 13px;
}

.dpf-auth-chip {
  font-size: 12px;
  color: var(--drpf-muted);
  border: 1px solid var(--drpf-border);
  border-radius: 999px;
  padding: 6px 10px;
  background: var(--drpf-surface);
}