:root {
  --bg-main: #020617;
  --bg-elevated: #0b1222;
  --bg-card: #0f172a;
  --bg-card-secondary: #0c1226;
  --border-subtle: #1f2937;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.15);
  --accent-secondary: #10b981;
  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --danger: #f97373;
  --radius-md: 0.75rem;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.45);
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color-scheme: dark light;
}

:root[data-theme="light"] {
  --bg-main: #f5f7fb;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --bg-card-secondary: #f4f8ff;
  --border-subtle: #d9e0ec;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --accent-secondary: #089c74;
  --text-main: #0f172a;
  --text-muted: #475569;
  --danger: #dc2626;
  --shadow-soft: 0 16px 36px rgba(15, 23, 42, 0.15);
  color-scheme: light dark;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background: radial-gradient(circle at top, var(--bg-elevated), var(--bg-main) 55%);
  color: var(--text-main);
  min-height: 100vh;
  transition: background 0.3s ease, color 0.25s ease;
}

/* Top bar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  max-width: 1150px;
  margin: 0 auto;
  backdrop-filter: blur(12px);
  background: linear-gradient(
    to right,
    color-mix(in srgb, var(--bg-card) 92%, transparent),
    color-mix(in srgb, var(--bg-elevated) 90%, transparent)
  );
  border-bottom: 1px solid color-mix(in srgb, var(--border-subtle) 80%, transparent);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-circle {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: radial-gradient(circle at top left, #60a5fa, #2563eb);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #e5e7eb;
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9), 0 14px 30px rgba(37, 99, 235, 0.4);
}

.topbar-title {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.title-main {
  font-size: 0.95rem;
  font-weight: 600;
}

.title-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Hamburger menu */

.menu-toggle {
  border: 1px solid color-mix(in srgb, var(--border-subtle) 80%, transparent);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  color: var(--text-main);
  padding: 0.35rem 0.9rem;
  font-size: 0.9rem;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
}

.menu-toggle:hover {
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
}

.menu-panel {
  position: absolute;
  right: 1rem;
  top: 3.25rem;
  width: min(340px, 92vw);
  padding: 1.4rem 1.4rem;
  background: var(--bg-card);
  border-radius: 0.9rem;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  display: none;
}

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

.menu-title {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.menu-note {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.config-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.75rem 0 0.5rem;
}

/* Layout */

.page {
  max-width: 1150px;
  margin: 1.5rem auto 2.5rem;
  padding: 0 1rem 2.5rem;
}

.hero {
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  margin: 0 0 0.5rem;
}

.hero-text {
  margin: 0;
  color: var(--text-muted);
  max-width: 720px;
  font-size: 0.98rem;
}

.hero-badges {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.badge {
  font-size: 0.78rem;
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--border-subtle) 90%, transparent);
  color: var(--text-muted);
}

/* Cards */

.card {
  background: radial-gradient(
    circle at top left,
    color-mix(in srgb, var(--accent) 14%, transparent),
    var(--bg-card)
  );
  border-radius: 1rem;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 90%, transparent);
  box-shadow: var(--shadow-soft);
  padding: 1.5rem 1.4rem;
  margin-bottom: 1.2rem;
}

.card-secondary {
  background: radial-gradient(
    circle at top right,
    color-mix(in srgb, var(--accent-secondary) 14%, transparent),
    var(--bg-card-secondary)
  );
}

.card-title {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.card-subtitle {
  margin: 0 0 1rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Form */

.field-label {
  display: block;
  margin-top: 0.9rem;
  margin-bottom: 0.25rem;
  font-size: 0.88rem;
  font-weight: 500;
}

.field-help {
  display: block;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.field-input {
  width: 100%;
  border-radius: 0.55rem;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 90%, transparent);
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
  color: var(--text-main);
  padding: 0.55rem 0.75rem;
  font-size: 0.9rem;
}

.field-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.8);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
}

.checkbox-row input[type="checkbox"] {
  width: auto;
}

/* Grid */

.grid-3 {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.9rem;
}

@media (min-width: 780px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Buttons */

.actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
  align-items: center;
}

.btn-primary,
.btn-secondary,
.btn-ghost {
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  padding: 0.55rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(to right, #2563eb, #1d4ed8);
  color: white;
  border-color: rgba(37, 99, 235, 0.9);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: wait;
}

.btn-secondary {
  background: rgba(16, 185, 129, 0.14);
  color: #a7f3d0;
  border-color: rgba(16, 185, 129, 0.7);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: rgba(55, 65, 81, 0.9);
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.05);
}

.btn-secondary:hover {
  background: rgba(16, 185, 129, 0.2);
}

.btn-ghost:hover {
  background: rgba(15, 23, 42, 0.9);
}

/* Button in menu */

.menu-reset {
  display: block;
  width: 100%;
  margin-top: 0.8rem;
}

/* Status */

.status-text {
  margin-top: 0.7rem;
  min-height: 1.2rem;
  font-size: 0.83rem;
  color: var(--text-muted);
}

.status-text.error {
  color: var(--danger);
}

.status-text.loading {
  color: var(--accent);
}

/* Output */

.output-area {
  margin-top: 0.4rem;
  width: 100%;
  min-height: 360px;
  border-radius: 0.65rem;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 90%, transparent);
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
  color: var(--text-main);
  padding: 0.7rem 0.8rem;
  font-size: 0.86rem;
  line-height: 1.4;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.output-area:focus {
  outline: none;
  border-color: var(--accent-secondary);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.8);
}

/* Steps card */

.steps-list {
  margin: 0.4rem 0 0.6rem 1.2rem;
  padding: 0;
  font-size: 0.9rem;
  color: var(--text-main);
}

.steps-list li {
  margin-bottom: 0.25rem;
}

.small-note {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.icon-btn {
  border: 1px solid var(--border-subtle);
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  color: var(--text-main);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.75rem;
  cursor: pointer;
}

.icon-btn:hover {
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
}

/* Footer */

.footer {
  border-top: 1px solid color-mix(in srgb, var(--border-subtle) 80%, transparent);
  background: radial-gradient(circle at bottom, var(--bg-main), var(--bg-main) 40%);
}

.footer-text {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0.9rem 1rem 1.2rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: left;
}

/* Onboarding overlay */

.onboarding {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: color-mix(in srgb, var(--bg-main) 85%, transparent);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.onboarding.hidden {
  display: none;
}

.onboarding-content {
  background: var(--bg-card);
  padding: 1.8rem 1.6rem;
  border-radius: 0.9rem;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 90%, transparent);
  max-width: 360px;
  text-align: center;
}

/* Split editor + preview */

.progress-shell {
  margin-top: 1rem;
  background: color-mix(in srgb, var(--accent-soft) 55%, transparent);
  border-radius: 0.75rem;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 60%, transparent);
}

.progress-bar {
  height: 6px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent-secondary) 70%, var(--accent)));
  transition: width 0.2s ease;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 0.75rem 0.6rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.split-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.view-toggle {
  display: flex;
  gap: 0.35rem;
}

.toggle-chip {
  border-radius: var(--radius-pill);
  border: 1px solid color-mix(in srgb, var(--border-subtle) 70%, transparent);
  background: color-mix(in srgb, var(--bg-card) 94%, transparent);
  padding: 0.4rem 0.9rem;
  color: var(--text-main);
  cursor: pointer;
  font-weight: 600;
}

.toggle-chip.active {
  border-color: var(--accent);
  color: white;
  background: linear-gradient(120deg, var(--accent), color-mix(in srgb, var(--accent-secondary) 70%, var(--accent)));
  box-shadow: 0 6px 22px color-mix(in srgb, var(--accent) 35%, transparent);
}

.split-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 0.9rem;
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 0.9fr);
  gap: 1rem;
}

.insight-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.insight-card {
  border: 1px solid color-mix(in srgb, var(--border-subtle) 85%, transparent);
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  border-radius: 0.9rem;
  padding: 0.9rem;
  box-shadow: var(--shadow-soft);
}

.seo-score-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.25rem;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--accent-soft) 40%, var(--bg-card));
  font-weight: 700;
}

.score-bar {
  margin: 0.6rem 0;
  width: 100%;
  height: 8px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--border-subtle) 55%, transparent);
  overflow: hidden;
}

.score-bar > div {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-secondary), var(--accent));
  transition: width 0.3s ease;
}

.insight-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.insight-list li {
  padding: 0.4rem 0.5rem;
  border-radius: 0.65rem;
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
  border: 1px solid color-mix(in srgb, var(--border-subtle) 80%, transparent);
  font-size: 0.88rem;
}

.insight-suggestions {
  margin-top: 0.6rem;
  border-top: 1px solid color-mix(in srgb, var(--border-subtle) 80%, transparent);
  padding-top: 0.5rem;
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.6rem;
}

.insight-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.insight-value {
  margin: 0.15rem 0 0;
  font-weight: 700;
}

.metadata-fields {
  display: grid;
  gap: 0.4rem;
}

.metadata-text {
  margin: 0;
  padding: 0.45rem 0.6rem;
  border-radius: 0.65rem;
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
  border: 1px solid color-mix(in srgb, var(--border-subtle) 80%, transparent);
  font-size: 0.9rem;
}

.complex-sentence {
  background: color-mix(in srgb, var(--danger) 25%, transparent);
  color: inherit;
  border-radius: 0.25rem;
  padding: 0.05rem 0.15rem;
}

.panel {
  border: 1px solid color-mix(in srgb, var(--border-subtle) 85%, transparent);
  background: var(--bg-card);
  border-radius: 0.9rem;
  padding: 0.9rem;
  box-shadow: var(--shadow-soft);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.panel-title {
  margin: 0;
  font-weight: 700;
  font-size: 1rem;
}

.panel-sub {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.metrics {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.preview-area {
  margin-top: 0.6rem;
  padding: 0.85rem;
  border-radius: 0.65rem;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 85%, transparent);
  background: color-mix(in srgb, var(--bg-card) 94%, transparent);
  min-height: 360px;
  overflow: auto;
  color: var(--text-main);
}

.preview-area h1,
.preview-area h2,
.preview-area h3,
.preview-area h4,
.preview-area h5 {
  margin-top: 0.4rem;
  margin-bottom: 0.35rem;
}

.preview-area p {
  line-height: 1.55;
}

.preview-area pre {
  background: color-mix(in srgb, var(--bg-elevated) 85%, transparent);
  padding: 0.75rem;
  border-radius: 0.65rem;
  overflow: auto;
}

.preview-area table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.4rem;
}

.preview-area th,
.preview-area td {
  border: 1px solid color-mix(in srgb, var(--border-subtle) 70%, transparent);
  padding: 0.45rem;
}

.preview-placeholder {
  color: var(--text-muted);
  margin: 0;
}

.history-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 30;
}

.history-overlay.open {
  display: flex;
}

.history-panel {
  width: min(520px, 95vw);
  max-height: min(80vh, 700px);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.history-list {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  overflow: auto;
  max-height: 460px;
  padding: 0.4rem;
  display: grid;
  gap: 0.5rem;
}

.history-item {
  padding: 0.6rem 0.75rem;
  border-radius: 0.6rem;
  border: 1px solid color-mix(in srgb, var(--border-subtle) 90%, transparent);
  background: color-mix(in srgb, var(--bg-card) 94%, transparent);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.history-item:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 35%, var(--bg-card));
}

.history-item-title {
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.history-item-meta {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.expert-mode {
  margin: 1rem 0 0.25rem;
  padding: 0.9rem;
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--bg-card) 90%, transparent);
}

.expert-panel.hidden {
  display: none;
}

.expert-panel .grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.75rem;
}

.estimate-box {
  margin-top: 0.75rem;
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--accent-soft) 40%, var(--bg-card));
}

.workflow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
  margin: 1rem 0;
}

.workflow .step {
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card-secondary);
  font-size: 0.9rem;
}

.workflow .step.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 40%, var(--bg-card));
}

.workflow .step.done {
  border-color: var(--accent-secondary);
  background: color-mix(in srgb, var(--accent-secondary) 12%, var(--bg-card));
}

.plan-panel {
  margin: 1rem 0;
}

.plan-area {
  min-height: 160px;
  margin-top: 0.25rem;
}

.selection-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

@media (max-width: 900px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .split-layout {
    grid-template-columns: 1fr;
  }

  .split-layout[data-view="editor"] .preview-panel {
    display: none;
  }

  .split-layout[data-view="preview"] .editor-panel {
    display: none;
  }
}

@media (max-width: 640px) {
  .topbar {
    gap: 0.5rem;
  }

  .menu-toggle {
    padding: 0.35rem 0.7rem;
  }

  .panel,
  .output-area,
  .preview-area {
    min-height: 240px;
  }
}