:root {
  --brown: #372E2D;
  --terracotta: #A37154;
  --cream: #F9F8F5;
  --terracotta-light: #f5ece4;
  --terracotta-mid: #e0c4ae;
  --text: #372E2D;
  --text-muted: #7d7270;
  --border: #e2d4cb;
  --bg: #F9F8F5;
  --white: #ffffff;
  --error: #b83c2c;
  --error-bg: #fdf0ee;
  --warning: #8a6020;
  --warning-bg: #fef6e8;
  --success: #5c6e40;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(55, 46, 45, 0.08);
  --shadow-lg: 0 4px 20px rgba(55, 46, 45, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100dvh;
}

/* ── Header ── */

.header {
  background: var(--brown);
  color: var(--white);
  padding: 20px 20px 18px;
  text-align: center;
}

.header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.header p {
  font-size: 0.85rem;
  opacity: 0.82;
  margin-top: 4px;
}

/* ── Layout ── */

.container {
  max-width: 540px;
  margin: 0 auto;
  padding: 20px 16px 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Card / Section ── */

.card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 20px;
}

.step-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--terracotta);
  margin-bottom: 6px;
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}

/* ── URL Input ── */

.url-input-wrap {
  position: relative;
}

.url-input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  -webkit-appearance: none;
}

.url-input::placeholder {
  color: #aaa;
  font-size: 0.9rem;
}

.url-input:focus {
  border-color: var(--brown);
}

.url-input.error {
  border-color: var(--error);
}

/* ── Preset Groups ── */

.preset-groups {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.preset-group-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.preset-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preset-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  color: var(--text);
  font-family: inherit;
  line-height: 1.3;
  min-height: 52px;
  transition: border-color 0.12s, background 0.12s;
  -webkit-tap-highlight-color: transparent;
  width: 100%;
}

.preset-btn:active {
  background: var(--terracotta-light);
}

.preset-btn.selected {
  border-color: var(--brown);
  background: var(--terracotta-light);
  color: var(--brown);
  font-weight: 600;
}

.preset-btn .btn-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  width: 28px;
  text-align: center;
}

.preset-btn .btn-label {
  flex: 1;
}

.preset-btn .btn-check {
  font-size: 1rem;
  color: var(--brown);
  opacity: 0;
  transition: opacity 0.12s;
  flex-shrink: 0;
}

.preset-btn.selected .btn-check {
  opacity: 1;
}

/* ── Advanced toggle ── */

.advanced-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  padding: 10px 0 2px;
  display: flex;
  align-items: center;
  gap: 6px;
  -webkit-tap-highlight-color: transparent;
}

.advanced-toggle:hover {
  color: var(--text);
}

.advanced-toggle .chevron {
  transition: transform 0.2s;
  display: inline-block;
}

.advanced-toggle.open .chevron {
  transform: rotate(180deg);
}

.advanced-panel {
  display: none;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.advanced-panel.open {
  display: block;
}

.manual-fields {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.field-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field-row label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.field-input {
  padding: 11px 14px;
  font-size: 0.95rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  outline: none;
  -webkit-appearance: none;
  transition: border-color 0.15s;
}

.field-input:focus {
  border-color: var(--brown);
}

/* ── Topic field (Step 2 standalone card) ── */

.topic-hint {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.topic-input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
  -webkit-appearance: none;
}

.topic-input::placeholder {
  color: #aaa;
  font-size: 0.9rem;
}

.topic-input:focus {
  border-color: var(--brown);
}

.topic-input.error {
  border-color: var(--error);
}

/* ── Error text ── */

.error-msg {
  font-size: 0.83rem;
  color: var(--error);
  margin-top: 6px;
  display: none;
}

.error-msg.visible {
  display: block;
}

/* ── Generate button ── */

.generate-btn {
  width: 100%;
  padding: 17px;
  background: var(--brown);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1.05rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: background 0.15s, transform 0.08s;
  -webkit-tap-highlight-color: transparent;
  min-height: 56px;
}

.generate-btn:active {
  background: var(--terracotta);
  transform: scale(0.99);
}

/* ── Result ── */

.result-card {
  display: none;
}

.result-card.visible {
  display: block;
}

.result-summary {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-style: italic;
}

.result-summary strong {
  color: var(--text);
  font-style: normal;
}

.result-url-box {
  background: var(--terracotta-light);
  border: 1px solid var(--terracotta-mid);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.82rem;
  word-break: break-all;
  color: var(--text);
  line-height: 1.6;
  user-select: all;
  -webkit-user-select: all;
  cursor: text;
}

.utm-highlight {
  color: var(--terracotta);
  font-weight: 600;
}

.result-actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

.copy-btn {
  flex: 1;
  padding: 15px;
  background: var(--brown);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
  min-height: 52px;
}

.copy-btn:active {
  background: var(--terracotta);
}

.copy-btn.copied {
  background: var(--success);
}

.reset-btn {
  padding: 15px 20px;
  background: var(--white);
  color: var(--text-muted);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  -webkit-tap-highlight-color: transparent;
  min-height: 52px;
}

.reset-btn:active {
  border-color: var(--text-muted);
  color: var(--text);
}

/* ── Warning / notice banners ── */

.warning-banner {
  display: none;
  background: var(--warning-bg);
  border: 1px solid #f0d080;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 0.85rem;
  color: var(--warning);
  margin-bottom: 12px;
}

.warning-banner.visible {
  display: block;
}

/* ── Footer ── */

.footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 0 16px 24px;
}

/* ── Responsive tweaks ── */

@media (min-width: 480px) {
  .header h1 {
    font-size: 1.4rem;
  }

  .preset-btn {
    font-size: 1.05rem;
  }
}