/* Base Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    color: #0f172a;
    background: #0b1020;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

:root {
    --bg: #0b1020;
    --panel: #101935;
    --panel-alt: #0f1530;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --primary: #7c3aed;
    --primary-600: #6d28d9;
    --accent: #22d3ee;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --card: #0f172a;
    --border: #1f2a44;
    --shadow: 0 10px 25px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.02);
    --radius: 14px;
}

/* Navigation */
.nav-bar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(10, 14, 30, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    letter-spacing: 0.3px;
}

.nav-logo i {
    color: var(--accent);
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 14px;
}

.nav-link {
    color: var(--muted);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 10px;
    transition: all .2s ease;
}

.nav-link.active, .nav-link:hover {
    color: var(--text);
    background: rgba(124, 58, 237, 0.12);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}
.hamburger span {
    width: 26px;
    height: 2px;
    background: var(--text);
    display: block;
}

/* Hero */
.hero {
    position: relative;
    background: radial-gradient(1200px 500px at 20% -10%, rgba(124,58,237,.28), transparent),
                radial-gradient(900px 400px at 80% -20%, rgba(34,211,238,.25), transparent),
                linear-gradient(180deg, #0b1020 0%, #0b1020 100%);
    border-bottom: 1px solid var(--border);
}
.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px 48px;
    color: var(--text);
}
.hero h1 {
    font-size: 48px;
    line-height: 1.1;
    letter-spacing: -0.02em;
}
.hero-subtitle {
    margin-top: 10px;
    color: var(--muted);
    font-size: 18px;
}
.hero-description {
    margin-top: 12px;
    color: #cbd5e1;
    max-width: 800px;
}

.hero-stats {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    max-width: 700px;
}
.stat {
    background: linear-gradient(180deg, #0f172a, #0c1430);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 16px;
    box-shadow: var(--shadow);
}
.stat-number {
    font-size: 24px;
    font-weight: 800;
    color: var(--accent);
}
.stat-label {
    display: block;
    color: var(--muted);
    font-size: 12px;
}

.cta-button {
    margin-top: 22px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-600) 100%);
    color: white;
    border: none;
    padding: 12px 16px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    box-shadow: 0 10px 24px rgba(124,58,237,.25);
}
.cta-button:hover {
    filter: brightness(1.05);
}

/* Sections */
.section {
    background: #0b1020;
}
.section.section-dark {
    background: #0c1328;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 20px;
}
.section-title {
    color: var(--text);
    font-size: 28px;
    margin-bottom: 20px;
}

/* Intro */
.intro-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}
.intro-card {
    background: linear-gradient(180deg, #0f172a, #0c1430);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    color: var(--text);
}
.card-icon {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    margin-bottom: 10px;
    color: var(--accent);
    background: rgba(34, 211, 238, .1);
    border: 1px solid rgba(34, 211, 238, .25);
}

.concept-box {
    margin-top: 22px;
    background: #0d1632;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    color: var(--text);
}
.comparison-table {
    margin-top: 12px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}
.comparison-item {
    background: #0e1836;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
}
.comparison-header {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    margin-bottom: 8px;
}
.comparison-item ul {
    color: var(--muted);
    padding-left: 16px;
}

/* Pillars */
.pillars-container {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 18px;
}
.pillar-selector {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.pillar-btn {
    text-align: left;
    background: #0f172a;
    border: 1px solid var(--border);
    color: var(--muted);
    border-radius: 12px;
    padding: 12px;
    cursor: pointer;
}
.pillar-btn.active, .pillar-btn:hover {
    color: var(--text);
    border-color: rgba(124,58,237,.6);
    background: linear-gradient(180deg, #0f172a, #0c1430);
}
.pillar-content {
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    color: var(--text);
}
.pillar-detail { display: none; }
.pillar-detail.active { display: block; }
.pillar-description { color: var(--muted); }

.trace-visualization {
    margin: 12px 0 6px;
    background: #0d1632;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
}
.span-block {
    background: linear-gradient(90deg, rgba(124,58,237,.25), rgba(124,58,237,.05));
    border: 1px solid rgba(124,58,237,.35);
    border-radius: 8px;
    padding: 8px 10px;
    margin-bottom: 8px;
}
.span-info { display: flex; justify-content: space-between; color: var(--text); }
.span-duration { color: var(--accent); font-weight: 600; }

.metrics-types { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 10px; }
.metric-type { background:#0d1632; border:1px solid var(--border); border-radius: 10px; padding: 12px; color: var(--text); }
.metric-icon { font-size: 22px; }

.log-example { margin-top: 10px; }
.log-entry { display:flex; gap:8px; align-items:center; background:#0d1632; border:1px solid var(--border); border-radius:8px; padding:8px 10px; color:var(--text); }
.log-level { font-size: 12px; padding: 2px 6px; border-radius: 6px; border: 1px solid var(--border); }
.log-level.info { color:#60a5fa; border-color:#1e40af; }
.log-level.error { color:#fca5a5; border-color:#7f1d1d; }
.log-timestamp { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }
.log-trace { color: #93c5fd; }

.correlation-demo { margin-top: 18px; }
.correlation-flow { display:flex; align-items: center; gap: 12px; }
.flow-step { background:#0f172a; border:1px solid var(--border); border-radius: 10px; padding: 12px; color: var(--text); width: 100%; }
.flow-arrow { color: var(--muted); font-weight: 700; }
.step-number { width: 26px; height: 26px; border-radius: 50%; background: rgba(34,211,238,.12); border:1px solid rgba(34,211,238,.35); color: var(--accent); display:grid; place-items:center; font-weight:700; margin-bottom:8px; }

/* Architecture */
.architecture-overview { display:grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.arch-component { background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 14px; color: var(--text); }
.component-icon { width:40px; height:40px; display:grid; place-items:center; border-radius: 10px; margin-bottom: 8px; }
.component-icon.api { background: rgba(34,211,238,.12); border:1px solid rgba(34,211,238,.35); color: var(--accent); }
.component-icon.sdk { background: rgba(124,58,237,.12); border:1px solid rgba(124,58,237,.35); color: var(--primary); }
.component-icon.otlp { background: rgba(59,130,246,.12); border:1px solid rgba(59,130,246,.35); color:#60a5fa; }
.component-icon.collector { background: rgba(34,197,94,.12); border:1px solid rgba(34,197,94,.35); color: var(--success); }

.instrumentation-tabs { display:flex; gap:8px; margin-top: 10px; }
.tab-btn { background:#0f172a; color: var(--muted); border:1px solid var(--border); border-radius: 10px; padding: 8px 10px; cursor:pointer; }
.tab-btn.active, .tab-btn:hover { color: var(--text); border-color: rgba(124,58,237,.6); background: linear-gradient(180deg, #0f172a, #0c1430); }
.tab-panel { display:none; margin-top: 12px; }
.tab-panel.active { display:block; }

.pros-cons { display:grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.pros, .cons { background:#0d1632; border:1px solid var(--border); border-radius: 10px; padding: 12px; color: var(--text); }
.pros ul, .cons ul { padding-left: 16px; color: var(--muted); }
.code-example pre { background:#0b1228; border:1px solid var(--border); border-radius: 10px; padding: 12px; color: var(--text); overflow:auto; }

.collector-pipeline { display:flex; align-items:center; gap: 10px; margin-top: 12px; }
.pipeline-stage { background:#0f172a; border:1px solid var(--border); border-radius: 10px; padding: 12px; color: var(--text); flex:1; text-align:center; }
.pipeline-arrow { color: var(--muted); font-weight: 700; }
.stage-icon { width: 40px; height: 40px; display:grid; place-items:center; border-radius: 10px; margin: 0 auto 6px; }
.stage-icon.receivers { background: rgba(59,130,246,.12); border:1px solid rgba(59,130,246,.35); color:#60a5fa; }
.stage-icon.processors { background: rgba(234,179,8,.12); border:1px solid rgba(234,179,8,.35); color:#fbbf24; }
.stage-icon.exporters { background: rgba(34,197,94,.12); border:1px solid rgba(34,197,94,.35); color: var(--success); }

.deployment-patterns { margin-top: 14px; }
.pattern-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.pattern-card { background:#0f172a; border:1px solid var(--border); border-radius: 10px; padding: 12px; color: var(--text); }
.pattern-card.recommended { border-color: rgba(124,58,237,.6); box-shadow: 0 0 0 1px rgba(124,58,237,.35) inset; }

/* Ecosystem */
.important-note { display:flex; gap:10px; align-items:flex-start; background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.vendor-grid { display:grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 10px; }
.vendor-card { background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.vendor-list { display:flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.vendor-tag, .tool-tag { background:#0d1632; border:1px solid var(--border); border-radius: 999px; padding: 6px 10px; color: var(--text); font-size: 12px; }

.oss-stack { display:grid; gap: 10px; margin-top: 8px; }
.stack-layer { display:flex; gap: 10px; align-items:center; background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.layer-icon { width: 40px; height: 40px; display:grid; place-items:center; border-radius: 10px; background: rgba(124,58,237,.12); border:1px solid rgba(124,58,237,.35); color: var(--primary); }
.layer-tools { display:flex; gap: 8px; flex-wrap: wrap; }

.strategy-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.strategy-option { background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.strategy-option.recommended { border-color: rgba(124,58,237,.6); box-shadow: 0 0 0 1px rgba(124,58,237,.35) inset; }

/* Maturity */
.maturity-legend { display:flex; gap: 14px; margin-bottom: 10px; }
.legend-item { display:flex; gap: 8px; align-items:center; color: var(--muted); }
.status-indicator { width: 10px; height: 10px; border-radius: 3px; }
.status-indicator.stable { background:#22c55e; }
.status-indicator.beta { background:#f59e0b; }
.status-indicator.development { background:#ef4444; }

.spec-grid { display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.spec-card { background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.spec-status { display:flex; gap: 6px; margin: 6px 0; }
.status-badge { display:inline-block; padding: 4px 8px; border-radius: 999px; font-size: 12px; background:#0d1632; border:1px solid var(--border); color: var(--muted); }
.status-badge.stable { color:#22c55e; border-color:#14532d; }
.status-badge.beta { color:#f59e0b; border-color:#713f12; }
.status-badge.development { color:#ef4444; border-color:#7f1d1d; }

.matrix-container { overflow-x:auto; }
.status-matrix { width:100%; border-collapse: collapse; }
.status-matrix th, .status-matrix td { border:1px solid var(--border); padding: 10px; color: var(--text); text-align:left; }
.status-matrix thead { background:#0d1632; }

/* Getting Started */
.steps-container { display:grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.step-card { background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.step-number { margin-bottom: 8px; }
.code-snippet { margin-top: 8px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; color: #cbd5e1; background:#0b1228; border:1px solid var(--border); border-radius: 8px; padding: 10px; }

.practices-grid { display:grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 10px; }
.practice-card { background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 12px; color: var(--text); }
.practice-icon { width: 40px; height: 40px; display:grid; place-items:center; border-radius: 10px; margin-bottom: 8px; color: var(--accent); background: rgba(34,211,238,.12); border:1px solid rgba(34,211,238,.35); }

/* Conclusion */
.conclusion-card { background: radial-gradient(800px 300px at 100% 0%, rgba(124,58,237,.18), transparent), linear-gradient(180deg, #0f172a, #0c1430); border:1px solid var(--border); border-radius: 16px; padding: 16px; color: var(--text); box-shadow: var(--shadow); }
.key-takeaways ul { padding-left: 16px; color: var(--muted); }

/* Footer */
.footer { background:#0a0f22; border-top: 1px solid var(--border); }
.footer-content { display:grid; grid-template-columns: repeat(3, 1fr); gap: 12px; color: var(--text); }
.footer-section h4 { margin-bottom: 8px; }
.footer-section ul { list-style: none; }
.footer-section a { color: #93c5fd; text-decoration: none; }
.footer-bottom { margin-top: 16px; color: var(--muted); text-align:center; }

/* Utilities */
.feature { color: var(--muted); }

/* Responsive */
@media (max-width: 1000px) {
    .intro-grid { grid-template-columns: 1fr; }
    .pillars-container { grid-template-columns: 1fr; }
    .metrics-types { grid-template-columns: 1fr; }
    .architecture-overview { grid-template-columns: 1fr 1fr; }
    .pattern-grid { grid-template-columns: 1fr; }
    .strategy-grid { grid-template-columns: 1fr; }
    .spec-grid { grid-template-columns: 1fr; }
    .steps-container { grid-template-columns: 1fr; }
    .practices-grid { grid-template-columns: 1fr; }
    .hero-stats { grid-template-columns: 1fr; }
    .nav-menu { display: none; position: absolute; top: 58px; right: 12px; background:#0f172a; border:1px solid var(--border); border-radius: 12px; padding: 10px; flex-direction: column; }
    .hamburger { display: flex; }
}

/* Active section accent */
.nav-link.active {
    background: linear-gradient(90deg, rgba(124,58,237,.18), rgba(34,211,238,.12));
    border: 1px solid rgba(124,58,237,.35);
}