/* ── Reset & Base ─────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --accent: #0071e3;
  --accent-hover: #0059b3;
  --border: #d2d2d7;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --mono: "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --surface: #2c2c2e;
    --text: #f5f5f7;
    --text-muted: #98989d;
    --accent: #0a84ff;
    --accent-hover: #409cff;
    --border: #48484a;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.32);
  }
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

a {
  color: var(--accent);
  text-decoration: underline;
  transition: color 0.15s;
}

a:hover {
  color: var(--accent-hover);
}

a:visited {
  color: var(--accent-hover);
}

/* ── Lists ───────────────────────────────────────────── */
ol,
ul {
  margin-left: 1.5rem;
  padding-left: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

/* ── Paragraphs ──────────────────────────────────────── */
p {
  margin-bottom: 1rem;
}

/* ── Layout ──────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 640px;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* ── Card ────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h2 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* ── Controls ────────────────────────────────────────── */
.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.control-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

.control-group input[type="number"],
.control-group input[type="text"] {
  font-family: var(--font);
  font-size: 1rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

/* checkbox inside label should be spaced from text */
.control-group label input[type="checkbox"] {
  margin-right: 0.35rem;
  vertical-align: middle;
}

.control-group input:focus {
  border-color: var(--accent);
}

.control-group select {
  font-family: var(--font);
  font-size: 1rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  cursor: pointer;
}

.control-group select:focus {
  border-color: var(--accent);
}

.control-group-full {
  grid-column: 1 / -1;
}

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  padding: 0.6rem 1.25rem;
  transition: background 0.15s, transform 0.1s;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  margin-top: 1rem;
  padding: 0.75rem;
  font-size: 1rem;
  border-radius: 10px;
}

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

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  padding: 0.45rem 0.9rem;
}

.btn-secondary:hover {
  background: var(--border);
}

/* ── Output ──────────────────────────────────────────── */
.output-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 3.5rem;
}

#passphrase-output {
  flex: 1;
  font-family: var(--mono);
  font-size: 1.35rem;
  font-weight: 600;
  word-break: break-all;
  line-height: 1.4;
  color: var(--text);
  padding: 0.5rem 0;
  user-select: all;
}

#passphrase-output.placeholder {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 1rem;
  font-family: var(--font);
}

#copy-btn {
  flex-shrink: 0;
  white-space: nowrap;
}

.copy-feedback {
  color: #34c759;
  font-size: 0.85rem;
  font-weight: 500;
}

/* ── Validation ──────────────────────────────────────── */
#validation-msg {
  color: #ff453a;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  min-height: 1.25rem;
}

/* subtle note text used for passphrase count */
.note {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Word List Section ───────────────────────────────── */
.wordlist-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.wordlist-header h2 {
  margin-bottom: 0;
}

.wordlist-toggle {
  font-size: 0.8rem;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
  font-family: var(--font);
}

/* controls panel can also be collapsed */
.controls-body {
  display: block;
  margin-top: 1rem;
}

.controls-body.collapsed {
  display: none;
}
#word-textarea {
  width: 100%;
  min-height: 160px;
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  outline: none;
  line-height: 1.5;
}

#word-textarea:focus {
  border-color: var(--accent);
}

.wordlist-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

#word-count-info {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: auto;
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 480px) {
  .controls {
    grid-template-columns: 1fr;
  }

  #passphrase-output {
    font-size: 1.1rem;
  }

  .output-area {
    flex-direction: column;
    align-items: stretch;
  }

  #copy-btn {
    width: 100%;
    text-align: center;
  }
}