/* ============================================================
   SLIM — Main Stylesheet
   ============================================================ */

:root {
  --navy:        #0D1B2A;
  --navy-2:      #132233;
  --navy-3:      #1a2f45;
  --navy-4:      #243d56;
  --teal:        #1B7F79;
  --teal-2:      #229990;
  --teal-light:  #2abfb5;
  --accent:      #E05C2A;
  --accent-2:    #f0773f;
  --green:       #22c55e;
  --yellow:      #eab308;

  --text:        #f1f5f9;
  --text-2:      #cbd5e1;
  --text-3:      #94a3b8;
  --text-4:      #64748b;

  --border:      rgba(255,255,255,0.07);
  --border-2:    rgba(255,255,255,0.12);
  --card:        rgba(255,255,255,0.04);
  --card-hover:  rgba(255,255,255,0.07);

  --radius:      12px;
  --radius-sm:   8px;
  --shadow:      0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg:   0 8px 48px rgba(0,0,0,0.5);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--navy);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--teal-light); text-decoration: none; }
a:hover { color: var(--accent-2); }
code, pre { font-family: var(--font-mono); }

/* ── Layout ─────────────────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ── Navigation ─────────────────────────────────────────────── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,27,42,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; gap: 8px;
  height: 60px; max-width: 1100px; margin: 0 auto; padding: 0 24px;
}
.nav-logo {
  font-size: 1.2rem; font-weight: 800; letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--teal-light), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  margin-right: 8px;
}
.nav-logo span { color: var(--text-3); -webkit-text-fill-color: var(--text-3); font-weight: 400; font-size: 0.85rem; }
.nav-links { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.nav-link {
  color: var(--text-3); font-size: 0.9rem; padding: 6px 12px; border-radius: 6px;
  transition: all 0.15s;
}
.nav-link:hover { color: var(--text); background: var(--card); }
.nav-cta {
  background: var(--teal); color: white !important; padding: 7px 16px;
  border-radius: 6px; font-weight: 600; font-size: 0.85rem;
  transition: background 0.15s; -webkit-text-fill-color: white !important;
}
.nav-cta:hover { background: var(--teal-2); }

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  padding: 96px 0 80px;
  text-align: center;
  position: relative; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 800px 400px at 50% -80px, rgba(27,127,121,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 600px 300px at 80% 100%, rgba(224,92,42,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(27,127,121,0.15); border: 1px solid rgba(27,127,121,0.3);
  color: var(--teal-light); padding: 5px 14px; border-radius: 100px;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.5px; text-transform: uppercase;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 900; line-height: 1.1; letter-spacing: -1.5px;
  max-width: 760px; margin: 0 auto 20px;
}
.hero h1 .accent { color: var(--accent-2); }
.hero h1 .teal   { color: var(--teal-light); }
.hero-sub {
  font-size: 1.15rem; color: var(--text-2); max-width: 560px;
  margin: 0 auto 36px; line-height: 1.7;
}
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 56px; }
.btn-primary {
  background: var(--teal); color: white; padding: 13px 28px;
  border-radius: var(--radius-sm); font-weight: 700; font-size: 1rem;
  transition: all 0.2s; border: none; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover { background: var(--teal-2); transform: translateY(-1px); box-shadow: 0 8px 24px rgba(27,127,121,0.35); }
.btn-secondary {
  background: var(--card); color: var(--text); padding: 13px 28px;
  border-radius: var(--radius-sm); font-weight: 600; font-size: 1rem;
  border: 1px solid var(--border-2); transition: all 0.2s; display: inline-flex; align-items: center; gap: 8px;
}
.btn-secondary:hover { background: var(--card-hover); border-color: var(--teal); color: var(--teal-light); }

/* ── Code comparison ─────────────────────────────────────────── */
.hero-compare {
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 16px; align-items: start; text-align: left;
  max-width: 960px; margin: 0 auto;
}
.compare-panel {
  background: var(--navy-2); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.compare-header {
  display: flex; align-items: center; gap: 8px; padding: 10px 16px;
  background: var(--navy-3); border-bottom: 1px solid var(--border);
  font-size: 0.78rem; font-weight: 600; color: var(--text-3);
}
.compare-header .dot { width: 8px; height: 8px; border-radius: 50%; }
.dot-red    { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green  { background: #28c840; }
.compare-label { margin-left: auto; font-size: 0.72rem; padding: 2px 8px; border-radius: 4px; }
.label-md   { background: rgba(255,255,255,0.07); color: var(--text-3); }
.label-slim { background: rgba(27,127,121,0.2); color: var(--teal-light); }
.compare-body { padding: 16px; font-size: 0.78rem; line-height: 1.7; overflow-x: auto; }

.compare-arrow {
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--teal); padding-top: 48px;
}

/* SLIM syntax highlight colours */
.sl-key     { color: #94a3b8; }
.sl-llm-key { color: var(--teal-light); font-weight: 700; }
.sl-punct   { color: var(--text-4); }
.sl-comment { color: #64748b; font-style: italic; }
.sl-block   { color: #a78bfa; font-weight: 700; }
.sl-directive { color: #fbbf24; }
.sl-heading { color: var(--text); font-weight: 700; }
.sl-var     { color: var(--accent-2); font-weight: 600; }
.sl-stripped { color: #ef4444; text-decoration: line-through; opacity: 0.5; }

/* ── Stats bar ───────────────────────────────────────────────── */
.stats-bar {
  background: var(--navy-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  padding: 28px 0;
}
.stats-inner {
  display: flex; justify-content: center; gap: 0; flex-wrap: wrap;
  max-width: 800px; margin: 0 auto;
}
.stat-item {
  flex: 1; min-width: 160px; text-align: center; padding: 0 32px;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: 2.4rem; font-weight: 900; letter-spacing: -1px;
  background: linear-gradient(135deg, var(--teal-light), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  display: block;
}
.stat-label { font-size: 0.82rem; color: var(--text-3); font-weight: 500; margin-top: 2px; }

/* ── Section ─────────────────────────────────────────────────── */
section { padding: 80px 0; }
.section-tag {
  display: inline-block; color: var(--teal-light); font-size: 0.75rem; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 800;
  letter-spacing: -0.5px; line-height: 1.2; margin-bottom: 16px;
}
.section-sub { font-size: 1.05rem; color: var(--text-2); max-width: 560px; line-height: 1.7; margin-bottom: 48px; }
.section-sub.center { margin: 0 auto 48px; text-align: center; }
.text-center { text-align: center; }

/* ── Problem section ─────────────────────────────────────────── */
.problem-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px;
  margin-top: 48px;
}
.problem-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; position: relative; overflow: hidden;
}
.problem-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, #ef4444, #f97316);
}
.problem-icon { font-size: 2rem; margin-bottom: 14px; }
.problem-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.problem-card p { font-size: 0.88rem; color: var(--text-3); line-height: 1.6; }

/* ── Features ────────────────────────────────────────────────── */
.features { background: var(--navy-2); }
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px;
}
.feature-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: all 0.2s; position: relative; overflow: hidden;
}
.feature-card:hover { border-color: var(--border-2); background: var(--card-hover); transform: translateY(-2px); }
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 3px; height: 100%;
  background: linear-gradient(180deg, var(--teal), var(--accent));
}
.feature-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(27,127,121,0.15); border: 1px solid rgba(27,127,121,0.2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: 16px;
}
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.87rem; color: var(--text-3); line-height: 1.6; margin-bottom: 12px; }
.feature-code {
  background: var(--navy); border: 1px solid var(--border);
  border-radius: 6px; padding: 10px 12px;
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-2); line-height: 1.6;
}

/* ── Benchmark ───────────────────────────────────────────────── */
.bench-avg {
  text-align: center; margin-bottom: 40px;
}
.bench-big {
  font-size: 5rem; font-weight: 900; letter-spacing: -3px; line-height: 1;
  background: linear-gradient(135deg, var(--teal-light), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.bench-sub { font-size: 1rem; color: var(--text-3); margin-top: 8px; }
.bench-bars { display: flex; flex-direction: column; gap: 14px; max-width: 720px; margin: 0 auto; }
.bench-row { display: grid; grid-template-columns: 180px 1fr 64px; align-items: center; gap: 12px; }
.bench-name { font-size: 0.84rem; color: var(--text-2); font-family: var(--font-mono); text-align: right; }
.bench-track { background: rgba(255,255,255,0.05); border-radius: 100px; height: 20px; overflow: hidden; }
.bench-fill {
  height: 100%; border-radius: 100px; position: relative;
  background: linear-gradient(90deg, var(--teal), var(--teal-light));
  transition: width 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.bench-fill.high { background: linear-gradient(90deg, var(--teal), var(--green)); }
.bench-pct { font-size: 0.84rem; font-weight: 700; color: var(--teal-light); text-align: right; }

/* ── Syntax guide ────────────────────────────────────────────── */
.syntax-guide { background: var(--navy-2); }
.syntax-tabs { display: flex; gap: 4px; margin-bottom: 24px; flex-wrap: wrap; }
.tab-btn {
  padding: 8px 16px; border-radius: 6px; border: 1px solid var(--border);
  background: var(--card); color: var(--text-3); font-size: 0.85rem; cursor: pointer;
  transition: all 0.15s; font-family: var(--font-sans);
}
.tab-btn.active { background: var(--teal); border-color: var(--teal); color: white; }
.tab-btn:hover:not(.active) { border-color: var(--border-2); color: var(--text); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Code blocks ─────────────────────────────────────────────── */
.code-block {
  background: var(--navy); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.code-block-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: var(--navy-3); border-bottom: 1px solid var(--border);
  font-size: 0.78rem; color: var(--text-3);
}
.code-block pre {
  padding: 20px; overflow-x: auto; font-size: 0.82rem; line-height: 1.7; white-space: pre;
}

/* ── Sigil table ─────────────────────────────────────────────── */
.sigil-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.sigil-table th {
  text-align: left; padding: 10px 14px; font-size: 0.78rem; font-weight: 600;
  color: var(--text-3); border-bottom: 1px solid var(--border); text-transform: uppercase; letter-spacing: 0.5px;
}
.sigil-table td { padding: 12px 14px; border-bottom: 1px solid rgba(255,255,255,0.04); vertical-align: top; }
.sigil-table tr:last-child td { border-bottom: none; }
.sigil-table tr:hover td { background: var(--card); }
.sigil { font-family: var(--font-mono); font-size: 0.85rem; color: var(--teal-light); font-weight: 700; }
.sigil-desc { color: var(--text-2); }
.sigil-note { color: var(--text-3); font-size: 0.82rem; }
.badge {
  display: inline-block; font-size: 0.68rem; font-weight: 700; padding: 2px 7px; border-radius: 4px;
  margin-left: 6px; vertical-align: middle;
}
.badge-strip   { background: rgba(239,68,68,0.15); color: #f87171; }
.badge-visible { background: rgba(27,127,121,0.15); color: var(--teal-light); }
.badge-sub     { background: rgba(224,92,42,0.15); color: var(--accent-2); }

/* ── CTA section ─────────────────────────────────────────────── */
.cta-section {
  text-align: center; padding: 96px 0;
  background: radial-gradient(ellipse 800px 400px at 50% 50%, rgba(27,127,121,0.12) 0%, transparent 70%);
}
.cta-section h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 800; letter-spacing: -0.5px; margin-bottom: 16px; }
.cta-section p { color: var(--text-2); font-size: 1.05rem; margin-bottom: 36px; }

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  background: var(--navy-2); border-top: 1px solid var(--border); padding: 40px 0;
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.footer-logo { font-weight: 800; font-size: 1.1rem; }
.footer-logo span { color: var(--text-4); font-weight: 400; font-size: 0.85rem; margin-left: 6px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-3); font-size: 0.88rem; }
.footer-links a:hover { color: var(--text); }
.footer-copy { color: var(--text-4); font-size: 0.8rem; width: 100%; }

/* ============================================================
   PLAYGROUND
   ============================================================ */
.pg-layout {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  height: calc(100vh - 60px); overflow: hidden;
}
.pg-panel {
  display: flex; flex-direction: column; border-right: 1px solid var(--border);
  overflow: hidden;
}
.pg-panel:last-child { border-right: none; }
.pg-panel-header {
  display: flex; align-items: center; gap: 8px; padding: 12px 16px;
  background: var(--navy-2); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.pg-title { font-size: 0.82rem; font-weight: 700; color: var(--text-2); }
.pg-panel-header .spacer { flex: 1; }

/* Format buttons */
.fmt-btns { display: flex; gap: 4px; }
.fmt-btn {
  padding: 4px 10px; border-radius: 5px; border: 1px solid var(--border);
  background: none; color: var(--text-3); font-size: 0.75rem; cursor: pointer;
  transition: all 0.15s; font-family: var(--font-sans);
}
.fmt-btn.active { background: var(--teal); border-color: var(--teal); color: white; }
.fmt-btn:hover:not(.active) { border-color: var(--border-2); color: var(--text); }

/* Textarea */
.pg-textarea {
  flex: 1; resize: none; border: none; outline: none;
  background: var(--navy); color: var(--text-2);
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.7;
  padding: 20px; overflow: auto;
}
.pg-textarea::placeholder { color: var(--text-4); }

/* Output */
.pg-output {
  flex: 1; overflow: auto; padding: 20px;
  font-family: var(--font-mono); font-size: 0.82rem; line-height: 1.7;
  white-space: pre; background: var(--navy); color: var(--text-2);
}
.pl-empty { color: var(--text-4); font-style: italic; }

/* Stats bar (playground) */
.pg-stats {
  background: var(--navy-3); border-top: 1px solid var(--border);
  padding: 10px 16px; flex-shrink: 0;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.pg-stat { font-size: 0.78rem; color: var(--text-3); }
.pg-stat strong { color: var(--text); }
.pg-stat .teal  { color: var(--teal-light); }
.pg-stat .accent { color: var(--accent-2); }

/* Savings badge */
.badge-green  { display:inline-block; background:rgba(34,197,94,0.15); color:var(--green); padding:2px 8px; border-radius:4px; font-size:0.75rem; font-weight:700; }
.badge-yellow { display:inline-block; background:rgba(234,179,8,0.15); color:var(--yellow); padding:2px 8px; border-radius:4px; font-size:0.75rem; font-weight:700; }
.badge-gray   { display:inline-block; background:var(--card); color:var(--text-3); padding:2px 8px; border-radius:4px; font-size:0.75rem; }

/* Error banner */
.error-banner {
  display: none; background: rgba(239,68,68,0.1); border-top: 1px solid rgba(239,68,68,0.3);
  color: #fca5a5; font-size: 0.78rem; padding: 8px 16px; flex-shrink: 0;
}

/* Buttons (playground) */
.icon-btn {
  background: var(--card); border: 1px solid var(--border);
  color: var(--text-3); padding: 5px 12px; border-radius: 5px;
  font-size: 0.75rem; cursor: pointer; transition: all 0.15s; font-family: var(--font-sans);
}
.icon-btn:hover { border-color: var(--border-2); color: var(--text); }

/* Drop zone */
#drop-zone { display: contents; }
#drop-zone.drag-over > .pg-panel:first-child { border: 2px dashed var(--teal); }

/* Example selector */
.example-select {
  background: var(--card); border: 1px solid var(--border); color: var(--text-3);
  border-radius: 5px; font-size: 0.75rem; padding: 5px 10px; font-family: var(--font-sans);
  cursor: pointer; outline: none;
}
.example-select option { background: var(--navy-2); color: var(--text); }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-compare { grid-template-columns: 1fr; }
  .compare-arrow { display: none; }
  .hero h1 { font-size: 2rem; }
  .pg-layout { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; height: auto; min-height: calc(100vh - 60px); }
  .pg-panel { height: 50vh; border-right: none; border-bottom: 1px solid var(--border); }
  .bench-row { grid-template-columns: 120px 1fr 56px; }
  .stat-item { padding: 0 16px; }
}
@media (max-width: 600px) {
  .container, .container-wide { padding: 0 16px; }
  .hero { padding: 60px 0 48px; }
  .nav-link { display: none; }
  .nav-cta { display: flex; }
  section { padding: 60px 0; }
  .bench-row { grid-template-columns: 100px 1fr 48px; }
}