/* ---------- Basic Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
}

/* ---------- Theme Vars ---------- */
:root {
  --bg: #ffffff;
  --bg-elevated: #f6f7f9;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #d1d5db;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --input-bg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-elevated: #181b22;
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --border: #2a2f3a;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --input-bg: #0f1115;
  }
}

/* ---------- Layout ---------- */
body {
  background: var(--bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

#app {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ---------- Icon button ---------- */

.icon-btn {
  position: absolute;
  right: 8px;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  opacity: 0.8;
  transition: opacity 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.icon-btn:hover {
  opacity: 1;
  background: color-mix(in srgb, var(--text) 6%, transparent);
  border-color: color-mix(in srgb, var(--text) 12%, transparent);
}

.icon-btn:active {
  transform: translateY(1px);
}

.icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ---------- Paper ---------- */
.paper {
    width: min(360px, 92vw);
    background: var(--bg-elevated);
    border-radius: 18px;
    padding: 24px;
    box-shadow: 0 18px 45px rgba(0,0,0,0.35);
    border: 1px solid rgba(0,0,0,0.08);
}

.paper-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.paper-title {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.paper-subtitle {
    margin: 6px 0 0 0;
    color: var(--text-muted);
    font-size: 14px;
}

.paper-body {
    display: grid;
    margin-top: 12px;
}

/* ---------- Inputs ---------- */
input {
  width: 100%;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border 0.15s ease, box-shadow 0.15s ease;
}

input::placeholder {
  color: var(--text-muted);
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 20%, transparent);
}

/* ---------- Util ---------- */
[hidden] {
  display: none !important;
}

/* ---------- Error message ---------- */
.error {
  color: #dc2626;
  font-size: 12px;
  line-height: 1.3;
  margin-top: 2px;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  .error {
    color: #f87171;
  }
}