:root {
  --brand-dark: #3F4753;
  --brand-orange: #F8971D;
  --bg: #f4f4f4;
  --panel: #ffffff;
  --border: #d8dadd;
  --text: #1c1f24;
  --muted: #6a7280;
  --danger: #c0392b;
  --ok: #1e7e34;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--brand-dark); }

/* Auth modal */
.auth-overlay {
  position: fixed; inset: 0;
  background: rgba(20, 24, 32, 0.7);
  display: grid; place-items: center;
  z-index: 1000;
}
.auth-modal {
  background: #fff; padding: 28px; border-radius: 8px;
  width: min(360px, 92vw);
  box-shadow: 0 10px 40px rgba(0,0,0,0.25);
}
.auth-modal h2 { margin: 0 0 8px; font-size: 18px; }
.auth-modal p { margin: 0 0 16px; color: var(--muted); font-size: 13px; }
.auth-modal input {
  width: 100%; padding: 10px 12px; font-size: 15px;
  border: 1px solid var(--border); border-radius: 4px;
}
.auth-modal button {
  margin-top: 16px; width: 100%; padding: 10px;
  background: var(--brand-dark); color: #fff; border: 0; border-radius: 4px;
  font-size: 15px; font-weight: 600; cursor: pointer;
}
.auth-modal button:disabled { opacity: 0.6; cursor: wait; }
.auth-error { margin-top: 10px; color: var(--danger); font-size: 13px; }

/* App shell */
.app {
  display: grid;
  grid-template-columns: 420px 1fr;
  height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  display: flex; flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  background: var(--brand-dark); color: #fff;
}
.sidebar-header h1 { margin: 0; font-size: 15px; font-weight: 600; letter-spacing: 0.5px; }
.sidebar-header a { color: rgba(255,255,255,0.8); font-size: 12px; text-decoration: none; }

.sidebar-tabs {
  display: flex; border-bottom: 1px solid var(--border);
}
.sidebar-tabs button {
  flex: 1; padding: 10px; background: transparent; border: 0;
  border-bottom: 2px solid transparent; cursor: pointer;
  font-size: 13px; color: var(--muted);
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.sidebar-tabs button.active {
  color: var(--text); border-bottom-color: var(--brand-orange); font-weight: 600;
}
.tab-badge {
  display: inline-block; min-width: 18px; height: 18px; padding: 0 5px;
  background: var(--danger); color: #fff; border-radius: 9px;
  font-size: 11px; font-weight: 700; line-height: 18px;
  text-align: center;
}

.sidebar-body { flex: 1; overflow-y: auto; padding: 16px; }

.sidebar-actions {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  display: flex; gap: 8px; flex-wrap: wrap;
}
.btn {
  padding: 9px 14px; border-radius: 4px; border: 1px solid var(--border);
  background: #fff; cursor: pointer; font-size: 13px; font-weight: 500;
}
.btn-primary { background: var(--brand-dark); color: #fff; border-color: var(--brand-dark); }
.btn-danger { background: #fff; color: var(--danger); border-color: var(--danger); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Cards */
.card {
  border: 1px solid var(--border); border-radius: 6px; padding: 12px;
  background: #fff; margin-bottom: 12px;
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; margin-bottom: 8px;
}
.card-title {
  font-size: 13px; font-weight: 600; color: var(--muted);
  flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.field { margin-bottom: 8px; }
.field label {
  display: block; font-size: 11px; color: var(--muted);
  margin-bottom: 3px; text-transform: uppercase; letter-spacing: 0.5px;
}
.field input, .field select, .field textarea {
  width: 100%; padding: 7px 9px; font-size: 13px;
  border: 1px solid var(--border); border-radius: 4px;
  background: #fff;
  font-family: inherit;
}
.field textarea { resize: vertical; min-height: 60px; }
.field input.invalid, .field select.invalid, .field textarea.invalid { border-color: var(--danger); }
.field-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px;
}

.card.drag-target { opacity: 0.4; }
.move-btns {
  display: flex; gap: 4px; flex-shrink: 0;
}
.move-btns button {
  width: 24px; height: 24px; padding: 0;
  border: 1px solid var(--border); border-radius: 3px;
  background: #fff; cursor: pointer;
  font-size: 13px; line-height: 1;
  display: inline-flex; align-items: center; justify-content: center;
}
.move-btns .card-remove {
  border-color: var(--danger); color: var(--danger);
  font-size: 18px;
}
.move-btns .card-remove:hover { background: var(--danger); color: #fff; }

/* Validation panel */
.validation {
  background: #fff5f5; border: 1px solid #f5c2c0; color: var(--danger);
  padding: 10px 12px; border-radius: 4px; margin-bottom: 12px;
  font-size: 13px;
  position: sticky; top: 0; z-index: 5;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.validation ul { margin: 6px 0 0 18px; padding: 0; }
.validation li { margin-bottom: 2px; }
.validation a { color: var(--danger); text-decoration: underline; cursor: pointer; }

/* Preview */
.preview-pane {
  background: #e7e9ec;
  display: flex; flex-direction: column;
  overflow: hidden;
  min-width: 0; /* allow shrinking inside grid; prevents horizontal page scroll */
}
.preview-header {
  padding: 10px 14px;
  background: var(--panel); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.preview-header strong { font-size: 13px; }
.preview-status { font-size: 12px; color: var(--muted); }
.preview-status.error { color: var(--danger); }
.preview-status.ok { color: var(--ok); }
.preview-iframe-wrap {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  padding: 20px;
  display: flex; justify-content: center;
}
.preview-iframe {
  border: 1px solid var(--border);
  /* 800px viewport keeps the email's mobile media query (max-width:600px) from firing;
     the email body itself is still 600px wide and centers inside the iframe like Gmail. */
  width: 800px; height: 800px; background: #fff;
  box-shadow: 0 4px 18px rgba(0,0,0,0.08);
  display: block; flex-shrink: 0;
}

/* Section subheaders inside sidebar */
.sb-section-label {
  font-size: 11px; font-weight: 700; color: var(--muted);
  text-transform: uppercase; letter-spacing: 1px;
  margin: 18px 0 8px;
}
.sb-section-label:first-child { margin-top: 0; }

/* Datalist hint */
.section-hint {
  font-size: 11px; color: var(--muted); margin-top: 3px;
}

.empty-state {
  padding: 32px 12px; text-align: center; color: var(--muted); font-size: 13px;
}