/* ============================================================
   Humanize AI — design system
   ============================================================ */
:root {
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Fraunces', Georgia, serif;

  /* Light theme */
  --bg: #f6f7fb;
  --bg-2: #ffffff;
  --bg-3: #eef0f6;
  --surface: rgba(255, 255, 255, 0.82);
  --border: #e3e6ef;
  --border-strong: #cfd4e2;
  --text: #0f1424;
  --text-2: #4b5268;
  --text-3: #7d8499;
  --primary: #6d5dfc;
  --primary-2: #8b7bff;
  --primary-ink: #ffffff;
  --accent: #14b8a6;
  --accent-2: #f59e0b;
  --danger: #ef4444;
  --success: #10b981;
  --grad: linear-gradient(120deg, #6d5dfc 0%, #a855f7 45%, #14b8a6 100%);
  --shadow-sm: 0 1px 2px rgba(15, 20, 36, 0.05), 0 2px 8px rgba(15, 20, 36, 0.04);
  --shadow: 0 8px 30px rgba(15, 20, 36, 0.08);
  --shadow-lg: 0 24px 60px rgba(15, 20, 36, 0.14);
  --radius: 16px;
  --radius-sm: 10px;
  --sidebar-w: 88px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme='dark'] {
  --bg: #0b0d14;
  --bg-2: #12151f;
  --bg-3: #181c29;
  --surface: rgba(18, 21, 31, 0.8);
  --border: #222636;
  --border-strong: #2f3449;
  --text: #eef0f7;
  --text-2: #aab1c5;
  --text-3: #6f7790;
  --primary: #8b7bff;
  --primary-2: #a99cff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
textarea, select, input { font: inherit; color: inherit; }
img, svg { display: block; max-width: 100%; }
::selection { background: color-mix(in srgb, var(--primary) 30%, transparent); }

/* ---------- Layout ---------- */
.app { min-height: 100dvh; display: flex; }

.sidebar {
  position: fixed; inset: 0 auto 0 0; z-index: 60;
  width: var(--sidebar-w);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 18px 10px;
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  transition: transform 0.4s var(--ease), background 0.35s var(--ease);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 800; letter-spacing: -0.02em; }
.brand-mark { width: 40px; height: 28px; color: var(--primary); display: grid; place-items: center; }
.brand-mark svg { width: 40px; height: 22px; }
.brand-text { display: none; font-size: 1.1rem; }
.brand-text span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

.nav { display: flex; flex-direction: column; gap: 4px; width: 100%; margin-top: 16px; }
.nav-item {
  position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 12px 6px 10px; border-radius: 14px;
  color: var(--text-2); font-size: 0.66rem; font-weight: 600; text-align: center; line-height: 1.2; white-space: nowrap;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), transform 0.25s var(--ease);
}
.nav-item i { font-size: 1.05rem; transition: transform 0.3s var(--ease); }
.nav-item:hover { background: var(--bg-3); color: var(--text); }
.nav-item:hover i { transform: translateY(-2px) scale(1.08); }
.nav-item.active { background: color-mix(in srgb, var(--primary) 14%, transparent); color: var(--primary); }
.nav-item .tag {
  position: absolute; top: 4px; right: 6px;
  font: 700 0.52rem/1 var(--font); font-style: normal; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 15%, transparent);
  padding: 3px 5px; border-radius: 6px;
}
.sidebar-foot { margin-top: auto; display: flex; flex-direction: column; gap: 6px; }

.main { flex: 1; min-width: 0; margin-left: var(--sidebar-w); display: flex; flex-direction: column; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 14px;
  padding: 12px clamp(14px, 3vw, 36px);
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: background 0.35s var(--ease);
}
.menu-btn { display: none !important; }
.brand-mobile { display: none; }
.top-links { display: flex; gap: 22px; margin-left: 8px; }
.top-links a { color: var(--text-2); font-weight: 500; font-size: 0.92rem; position: relative; transition: color 0.25s; }
.top-links a::after { content: ''; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px; background: var(--primary); transform: scaleX(0); transform-origin: left; transition: transform 0.3s var(--ease); }
.top-links a:hover { color: var(--text); }
.top-links a:hover::after { transform: scaleX(1); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.engine-badge {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 0.75rem; font-weight: 600; color: var(--text-2);
  padding: 6px 10px; border-radius: 999px; border: 1px solid var(--border); background: var(--bg-2);
}
.engine-badge i { font-size: 0.5rem; color: var(--text-3); }
.engine-badge.ok i { color: var(--success); animation: pulse 2s infinite; }
.engine-badge.bad i { color: var(--danger); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; font-weight: 600; font-size: 0.92rem;
  border: 1px solid transparent; white-space: nowrap;
  transition: transform 0.2s var(--ease), box-shadow 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
}
.btn:active { transform: translateY(1px) scale(0.98); }
.btn-sm { padding: 8px 14px; font-size: 0.85rem; }
.btn-primary { background: var(--text); color: var(--bg); box-shadow: var(--shadow-sm); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-ghost { border-color: var(--border); color: var(--text-2); background: var(--bg-2); }
.btn-ghost:hover { color: var(--text); border-color: var(--border-strong); }

.icon-btn {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  color: var(--text-2); border: 1px solid transparent;
  transition: background 0.25s, color 0.25s, transform 0.2s var(--ease), border-color 0.25s;
}
.icon-btn:hover { background: var(--bg-3); color: var(--text); }
.icon-btn:active { transform: scale(0.94); }

.chip-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: 8px; font-size: 0.78rem; font-weight: 600; color: var(--text-2);
  border: 1px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s var(--ease);
}
.chip-btn:hover { background: var(--bg-3); color: var(--text); }
.chip-btn:active { transform: scale(0.96); }
.chip-btn.success { color: var(--success); }

/* ---------- Hero ---------- */
.hero {
  position: relative; text-align: center;
  padding: clamp(40px, 7vw, 84px) clamp(16px, 4vw, 40px) 22px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; z-index: 0; }
.orb { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.35; animation: float 14s ease-in-out infinite; }
.orb-1 { width: 420px; height: 420px; background: #8b7bff; top: -160px; left: 10%; }
.orb-2 { width: 380px; height: 380px; background: #14b8a6; top: -120px; right: 8%; animation-delay: -5s; }
.orb-3 { width: 300px; height: 300px; background: #f59e0b; bottom: -180px; left: 45%; opacity: 0.2; animation-delay: -9s; }
html[data-theme='dark'] .orb { opacity: 0.22; }
@keyframes float { 0%, 100% { transform: translate(0, 0) scale(1); } 50% { transform: translate(30px, 24px) scale(1.08); } }
.hero > * { position: relative; z-index: 1; }

.hero-pill {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center;
  padding: 7px 14px; border-radius: 999px; font-size: 0.82rem; color: var(--text-2);
  background: var(--bg-2); border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.hero-pill b { color: var(--text); }
.stars { color: #22c55e; display: inline-flex; gap: 2px; font-size: 0.85rem; }

.hero-title {
  margin: 22px auto 14px; max-width: 900px;
  font-family: var(--font); font-weight: 800; letter-spacing: -0.035em; line-height: 1.05;
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
}
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { margin: 0 auto; max-width: 640px; color: var(--text-2); font-size: clamp(1rem, 1.6vw, 1.15rem); }

/* ---------- Workspace ---------- */
.workspace {
  position: relative; z-index: 2;
  margin: 18px clamp(12px, 3vw, 36px) 0;
  padding: clamp(14px, 2vw, 24px);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow-lg);
}
.workspace::before {
  content: ''; position: absolute; inset: -1px; border-radius: 25px; padding: 1px; z-index: -1;
  background: var(--grad); opacity: 0.55;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
}

.tool-tabs {
  display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 14px;
  scrollbar-width: none; -webkit-overflow-scrolling: touch;
}
.tool-tabs::-webkit-scrollbar { display: none; }
.tool-tab {
  flex: 0 0 auto; display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px; border-radius: 999px; font-size: 0.85rem; font-weight: 600;
  color: var(--text-2); background: var(--bg-3); border: 1px solid transparent;
  transition: all 0.25s var(--ease);
}
.tool-tab i { font-size: 0.8rem; }
.tool-tab:hover { color: var(--text); transform: translateY(-1px); }
.tool-tab.active { background: var(--text); color: var(--bg); box-shadow: var(--shadow-sm); }

.tool-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.tool-head h2 { margin: 0 0 4px; font-size: 1.3rem; letter-spacing: -0.02em; }
.tool-head p { margin: 0; color: var(--text-2); font-size: 0.92rem; }
.tool-options { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.opt { display: flex; flex-direction: column; gap: 4px; }
.opt label { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); }
.seg { display: inline-flex; padding: 3px; border-radius: 10px; background: var(--bg-3); border: 1px solid var(--border); }
.seg button {
  padding: 6px 11px; border-radius: 8px; font-size: 0.8rem; font-weight: 600; color: var(--text-2);
  transition: background 0.25s, color 0.25s, box-shadow 0.25s;
}
.seg button.active { background: var(--bg-2); color: var(--text); box-shadow: var(--shadow-sm); }
.select {
  appearance: none; -webkit-appearance: none;
  padding: 8px 32px 8px 12px; border-radius: 10px; font-size: 0.85rem; font-weight: 600;
  background: var(--bg-3) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237d8499' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 12px center;
  border: 1px solid var(--border); color: var(--text);
  transition: border-color 0.2s;
}
.select:focus { outline: none; border-color: var(--primary); }

.editor-grid {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: stretch;
}
.editor-card {
  display: flex; flex-direction: column; min-width: 0;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.editor-card:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 14%, transparent); }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px 6px; }
.eyebrow { display: inline-flex; align-items: center; gap: 6px; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); }
.card-tools { display: flex; gap: 2px; }
.editor {
  flex: 1; min-height: 300px; max-height: 60vh; margin: 0; padding: 8px 16px 14px;
  border: 0; background: transparent; resize: none; outline: none;
  font-size: 1rem; line-height: 1.7; color: var(--text); overflow-y: auto;
  white-space: pre-wrap; word-wrap: break-word;
}
.editor::placeholder { color: var(--text-3); }
.output { position: relative; }
.output .placeholder {
  height: 100%; min-height: 240px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  color: var(--text-3); text-align: center;
}
.output .placeholder i { font-size: 2rem; opacity: 0.6; }
.output .placeholder p { margin: 0; font-size: 0.92rem; }
.output p { margin: 0 0 1em; }
.output p:last-child { margin-bottom: 0; }
.output ul, .output ol { margin: 0 0 1em; padding-left: 1.3em; }
.card-foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 14px 10px; border-top: 1px dashed var(--border); flex-wrap: wrap; }
.stats { font-size: 0.78rem; color: var(--text-2); font-weight: 500; }
.stats.muted { color: var(--text-3); }
.stats.ok { color: var(--success); }
.stats.warn { color: var(--accent-2); }
.stats.bad { color: var(--danger); }

.run-col { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; }
.run-btn {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 6px;
  width: 92px; padding: 16px 8px; border-radius: 18px; font-weight: 700; font-size: 0.8rem;
  color: var(--primary-ink); background: var(--grad); background-size: 200% 200%;
  box-shadow: 0 10px 30px color-mix(in srgb, var(--primary) 45%, transparent);
  transition: transform 0.25s var(--ease), box-shadow 0.3s var(--ease), filter 0.25s;
  animation: gradShift 8s ease infinite;
}
@keyframes gradShift { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.run-btn:hover { transform: translateY(-3px) scale(1.03); box-shadow: 0 16px 40px color-mix(in srgb, var(--primary) 55%, transparent); }
.run-btn:active { transform: scale(0.97); }
.run-btn:disabled { filter: saturate(0.4); cursor: progress; transform: none; }
.run-icon { width: 40px; height: 40px; border-radius: 12px; background: rgba(255,255,255,0.18); display: grid; place-items: center; font-size: 1.1rem; }
.run-btn.loading .run-icon i { animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.swap-btn { border: 1px solid var(--border); background: var(--bg-2); }

/* ---------- Result panels ---------- */
.results { display: grid; gap: 14px; margin-top: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.results:empty { display: none; }
.panel {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px;
  animation: rise 0.5s var(--ease) both;
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.panel h4 { margin: 0 0 10px; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); display: flex; align-items: center; gap: 8px; }
.panel.wide { grid-column: 1 / -1; }

.gauge { display: flex; align-items: center; gap: 16px; }
.ring { position: relative; width: 96px; height: 96px; flex: 0 0 auto; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 9; stroke-linecap: round; }
.ring .track { stroke: var(--bg-3); }
.ring .bar { stroke: var(--success); stroke-dasharray: 251; stroke-dashoffset: 251; transition: stroke-dashoffset 1.1s var(--ease), stroke 0.5s; }
.ring .val { position: absolute; inset: 0; display: grid; place-items: center; font-weight: 800; font-size: 1.25rem; letter-spacing: -0.03em; }
.ring .val small { font-size: 0.65rem; color: var(--text-3); font-weight: 600; margin-top: -3px; }
.gauge-info b { display: block; font-size: 1.05rem; letter-spacing: -0.01em; }
.gauge-info span { color: var(--text-2); font-size: 0.85rem; }
.verdict { display: inline-block; margin-top: 6px; padding: 4px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; }
.verdict.human { background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); }
.verdict.mixed { background: color-mix(in srgb, var(--accent-2) 15%, transparent); color: var(--accent-2); }
.verdict.ai { background: color-mix(in srgb, var(--danger) 15%, transparent); color: var(--danger); }

.compare { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; text-align: center; }
.compare .num { font-size: 2rem; font-weight: 800; letter-spacing: -0.04em; line-height: 1; }
.compare .lbl { font-size: 0.72rem; color: var(--text-3); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; margin-top: 4px; }
.compare .arrow { color: var(--text-3); font-size: 1.2rem; }
.num.good { color: var(--success); } .num.bad { color: var(--danger); } .num.mid { color: var(--accent-2); }

.signals { display: grid; gap: 8px; }
.signal { display: grid; grid-template-columns: 8px 1fr auto; gap: 10px; align-items: center; font-size: 0.85rem; }
.signal .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-3); }
.signal.ai .dot { background: var(--danger); } .signal.human .dot { background: var(--success); }
.signal b { font-weight: 600; } .signal small { display: block; color: var(--text-3); }
.signal .v { font-weight: 700; color: var(--text-2); }

.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; }
.metric { padding: 10px 12px; border-radius: 12px; background: var(--bg-2); border: 1px solid var(--border); }
.metric span { display: block; font-size: 0.7rem; color: var(--text-3); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.metric b { display: block; font-size: 1.25rem; letter-spacing: -0.02em; margin-top: 2px; }
.metric small { color: var(--text-2); font-size: 0.75rem; }
.metric .delta { font-size: 0.75rem; font-weight: 700; margin-left: 6px; }
.delta.up { color: var(--success); } .delta.down { color: var(--danger); }

.heat { font-size: 0.95rem; line-height: 1.8; }
.heat span { padding: 1px 3px; border-radius: 4px; transition: background 0.3s; }
.legend { display: flex; gap: 14px; margin-top: 10px; font-size: 0.75rem; color: var(--text-2); flex-wrap: wrap; }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -2px; margin-right: 5px; }

.issues { display: grid; gap: 8px; }
.issue { display: grid; grid-template-columns: auto 1fr; gap: 10px; padding: 10px 12px; border-radius: 12px; background: var(--bg-2); border: 1px solid var(--border); font-size: 0.86rem; }
.issue .type { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; padding: 3px 7px; border-radius: 6px; background: color-mix(in srgb, var(--primary) 14%, transparent); color: var(--primary); align-self: start; white-space: nowrap; }
.issue del { color: var(--danger); text-decoration-color: color-mix(in srgb, var(--danger) 60%, transparent); }
.issue ins { color: var(--success); text-decoration: none; font-weight: 600; }
.issue small { display: block; color: var(--text-3); margin-top: 3px; }
.issue.risk-high .type { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); }
.issue.risk-medium .type { background: color-mix(in srgb, var(--accent-2) 16%, transparent); color: var(--accent-2); }
.issue.risk-low .type { background: color-mix(in srgb, var(--success) 14%, transparent); color: var(--success); }

.note { font-size: 0.8rem; color: var(--text-3); margin: 10px 0 0; display: flex; gap: 8px; align-items: flex-start; }
.note i { margin-top: 3px; }

/* ---------- Trust bar ---------- */
.trust {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px;
  margin: 18px clamp(12px, 3vw, 36px) 0;
}
.trust > div { display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto; column-gap: 12px; padding: 14px 16px; border-radius: var(--radius); background: var(--bg-2); border: 1px solid var(--border); transition: transform 0.3s var(--ease), box-shadow 0.3s; }
.trust > div:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.trust i { grid-row: 1 / 3; align-self: center; width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); }
.trust b { font-size: 0.9rem; } .trust span { font-size: 0.78rem; color: var(--text-2); }

/* ---------- Sections ---------- */
.section { padding: clamp(44px, 7vw, 84px) clamp(16px, 3vw, 36px) 0; max-width: 1180px; width: 100%; margin: 0 auto; }
.section-title { margin: 0; text-align: center; font-size: clamp(1.6rem, 3.6vw, 2.4rem); letter-spacing: -0.03em; font-weight: 800; }
.section-sub { margin: 8px auto 34px; text-align: center; color: var(--text-2); max-width: 560px; }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; counter-reset: s; }
.steps li { position: relative; padding: 22px 20px 20px; border-radius: var(--radius); background: var(--bg-2); border: 1px solid var(--border); transition: transform 0.3s var(--ease), box-shadow 0.3s; }
.steps li:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.step-n { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-weight: 800; color: #fff; background: var(--grad); margin-bottom: 12px; }
.steps h3 { margin: 0 0 6px; font-size: 1.05rem; } .steps p { margin: 0; color: var(--text-2); font-size: 0.9rem; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; }
.feature { display: block; padding: 22px 20px; border-radius: var(--radius); background: var(--bg-2); border: 1px solid var(--border); transition: transform 0.3s var(--ease), box-shadow 0.3s, border-color 0.3s; }
.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.feature i { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent); font-size: 1rem; margin-bottom: 14px; }
.feature h3 { margin: 0 0 6px; font-size: 1.02rem; } .feature p { margin: 0; color: var(--text-2); font-size: 0.88rem; }

.faq { max-width: 780px; margin: 0 auto; display: grid; gap: 10px; }
.faq details { background: var(--bg-2); border: 1px solid var(--border); border-radius: 14px; padding: 0 18px; transition: border-color 0.3s; }
.faq details[open] { border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.faq summary { cursor: pointer; padding: 16px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 1.3rem; color: var(--text-3); transition: transform 0.3s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { margin: 0 0 16px; color: var(--text-2); font-size: 0.92rem; }

.footer { margin-top: clamp(50px, 7vw, 90px); padding: 30px clamp(16px, 3vw, 36px) 40px; border-top: 1px solid var(--border); text-align: center; color: var(--text-2); font-size: 0.88rem; }
.footer-brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; color: var(--text); }
.footer nav { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; margin-top: 12px; }
.footer nav a:hover { color: var(--text); }

/* ---------- Drawers ---------- */
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 90; width: min(420px, 100%);
  background: var(--bg-2); border-left: 1px solid var(--border); box-shadow: var(--shadow-lg);
  transform: translateX(100%); transition: transform 0.45s var(--ease);
  display: flex; flex-direction: column;
}
.drawer.open { transform: none; }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; border-bottom: 1px solid var(--border); }
.drawer-head h3 { margin: 0; font-size: 1.05rem; display: flex; gap: 10px; align-items: center; }
.drawer-head > div { display: flex; gap: 4px; align-items: center; }
.drawer-body { padding: 16px 18px; overflow-y: auto; flex: 1; display: grid; gap: 14px; align-content: start; }
.backdrop { position: fixed; inset: 0; z-index: 80; background: rgba(6, 8, 14, 0.5); opacity: 0; pointer-events: none; transition: opacity 0.35s; backdrop-filter: blur(2px); }
.backdrop.show { opacity: 1; pointer-events: auto; }
#sidebarBackdrop { z-index: 55; }

.hist { padding: 12px 14px; border-radius: 12px; background: var(--bg); border: 1px solid var(--border); cursor: pointer; transition: border-color 0.25s, transform 0.25s var(--ease); }
.hist:hover { border-color: var(--primary); transform: translateX(-3px); }
.hist .h-top { display: flex; justify-content: space-between; gap: 8px; font-size: 0.72rem; color: var(--text-3); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.hist .h-top b { color: var(--primary); }
.hist p { margin: 6px 0 0; font-size: 0.86rem; color: var(--text-2); display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.empty { text-align: center; color: var(--text-3); padding: 30px 10px; font-size: 0.9rem; }

.field { display: grid; gap: 6px; font-size: 0.88rem; font-weight: 600; }
.field small { font-weight: 400; color: var(--text-3); }
.field textarea, .field select { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); font-weight: 400; resize: vertical; }
.field textarea:focus, .field select:focus { outline: none; border-color: var(--primary); }
.field.check { grid-template-columns: auto 1fr; align-items: center; gap: 10px; }
.field.check input { width: 18px; height: 18px; accent-color: var(--primary); }
.hint { font-size: 0.78rem; color: var(--text-3); margin: 0; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 24px; z-index: 200; transform: translate(-50%, 20px);
  padding: 11px 18px; border-radius: 12px; font-size: 0.88rem; font-weight: 600;
  background: var(--text); color: var(--bg); box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none; transition: opacity 0.3s, transform 0.4s var(--ease);
  max-width: calc(100vw - 32px); text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--danger); color: #fff; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* Loading skeleton in output */
.skeleton { display: grid; gap: 12px; padding: 4px 0; }
.skeleton i { display: block; height: 14px; border-radius: 6px; background: linear-gradient(90deg, var(--bg-3) 25%, var(--bg-2) 50%, var(--bg-3) 75%); background-size: 200% 100%; animation: shimmer 1.4s infinite; }
@keyframes shimmer { to { background-position: -200% 0; } }
.progress-line { position: absolute; left: 0; right: 0; top: 0; height: 2px; background: var(--grad); background-size: 200% 100%; animation: gradShift 1.4s linear infinite; border-radius: 2px; }

.hide-sm { display: inline; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1100px) {
  .editor-grid { grid-template-columns: 1fr; }
  .run-col { flex-direction: row; justify-content: center; }
  .run-btn { flex-direction: row; width: min(100%, 320px); padding: 12px 22px; justify-content: center; gap: 12px; font-size: 0.95rem; border-radius: 999px; }
  .run-icon { width: 32px; height: 32px; }
  .editor { min-height: 220px; max-height: 45vh; }
}

@media (max-width: 900px) {
  .top-links { display: none; }
  .engine-badge span { display: none; }
  .engine-badge { padding: 8px; }
}

@media (max-width: 760px) {
  :root { --sidebar-w: 0px; }
  .sidebar {
    width: min(300px, 86vw); align-items: stretch; transform: translateX(-100%); padding: 20px 16px;
  }
  .sidebar.open { transform: none; }
  .sidebar .brand { padding: 0 6px 10px; }
  .sidebar .brand-text { display: inline; }
  .sidebar .brand-mark { width: 40px; }
  .nav-item { flex-direction: row; justify-content: flex-start; gap: 14px; padding: 12px 14px; font-size: 0.95rem; }
  .nav-item i { width: 20px; text-align: center; }
  .nav-item .tag { position: static; margin-left: auto; }
  .sidebar-foot { flex-direction: row; justify-content: space-around; padding-top: 12px; border-top: 1px solid var(--border); }
  .main { margin-left: 0; }
  .menu-btn { display: grid !important; }
  .brand-mobile { display: flex; }
  .brand-mobile .brand-text { display: inline; font-size: 1rem; }
  .hide-sm { display: none; }
  .btn-sm { padding: 8px 12px; }
  .workspace { border-radius: 18px; margin-left: 10px; margin-right: 10px; }
  .workspace::before { border-radius: 19px; }
  .tool-head h2 { font-size: 1.12rem; }
  .card-tools .chip-btn span { display: none; }
  .card-tools .chip-btn { padding: 7px 9px; }
  .hero { padding-top: 30px; }
  .hero-title br { display: none; }
  .hero-title .grad { display: block; }
  .hero-title { font-size: clamp(2rem, 9.5vw, 2.6rem); }
  .compare .num { font-size: 1.6rem; }
  .drawer { width: 100%; }
}

@media (max-width: 420px) {
  .topbar { gap: 8px; padding: 10px 12px; }
  .top-actions .btn-primary span { display: none; }
  .top-actions .btn-primary { width: 36px; height: 36px; padding: 0; }
  .hero-pill { font-size: 0.75rem; }
  .editor { font-size: 0.95rem; padding: 6px 12px 12px; }
  .metric b { font-size: 1.05rem; }
  .ring { width: 84px; height: 84px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
  .reveal { opacity: 1; transform: none; }
}

.loading-msg { margin: 14px 0 0; font-size: 0.85rem; color: var(--text-2); font-weight: 500; display: flex; align-items: center; gap: 8px; }
.loading-msg::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); animation: pulse 1.2s infinite; }