:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.85);
    --card-bg-hover: rgba(30, 41, 59, 0.95);
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --accent-color: #3b82f6;
    --border-color: rgba(148, 163, 184, 0.15);
    --service-color: #3b82f6;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

body::after {
    content: '';
    position: fixed;
    inset: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(ellipse at 30% 10%, rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 90%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.sl-container {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 2rem 3rem;
}

/* ── Navigation ── */
.sl-topnav {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-bottom: 2rem;
    animation: fadeInDown 0.6s ease-out;
}

.sl-nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sl-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.sl-nav-link:hover {
    color: #fff;
    border-color: var(--service-color);
    background: rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.1);
}

.sl-nav-arrow {
    font-weight: 400;
    opacity: 0.7;
}

/* ── Hero ── */
.sl-hero {
    text-align: center;
    padding: 2.5rem 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    background: var(--card-bg);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.7s ease-out 0.1s backwards;
}

.sl-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--service-color), transparent);
}

.sl-hero-status {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.65rem;
    border-radius: 9999px;
    margin-bottom: 1rem;
    color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.sl-hero-status .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse 2s ease-in-out infinite;
}

.sl-hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 0.3rem;
    color: #f1f5f9;
}

.sl-hero .tagline {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 300;
    margin-bottom: 0.4rem;
}

.sl-hero .desc {
    font-size: 0.8rem;
    color: var(--text-dim);
    max-width: 560px;
    margin: 0 auto 1.5rem;
    line-height: 1.6;
}

.sl-hero-actions {
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.sl-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 1.1rem;
    border-radius: 8px;
    font-size: 0.78rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.sl-btn-primary {
    background: var(--service-color);
    color: #fff;
}

.sl-btn-primary:hover {
    filter: brightness(1.15);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.3);
}

.sl-btn-outline {
    border-color: var(--border-color);
    color: var(--text-muted);
    background: transparent;
}

.sl-btn-outline:hover {
    border-color: var(--service-color);
    color: #fff;
    background: rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.08);
}

/* ── Section titles ── */
.sl-section {
    margin-bottom: 1.75rem;
}

.sl-section-title {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--service-color);
    margin-bottom: 0.85rem;
    padding-left: 0.6rem;
    border-left: 2px solid var(--service-color);
}

/* ── Features Grid ── */
.sl-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.85rem;
    animation: fadeInUp 0.7s ease-out 0.2s backwards;
}

.sl-feature {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    transition: all 0.25s;
    text-decoration: none;
    display: block;
    cursor: pointer;
}

.sl-feature:hover {
    background: var(--card-bg-hover);
    border-color: rgba(148, 163, 184, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px -6px rgba(0, 0, 0, 0.3);
}

.sl-feature-icon {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    display: block;
}

.sl-feature-name {
    font-size: 0.85rem;
    font-weight: 700;
    color: #f1f5f9;
    margin-bottom: 0.25rem;
}

.sl-feature-desc {
    font-size: 0.7rem;
    color: var(--text-dim);
    line-height: 1.4;
}

.sl-feature-tag {
    display: inline-block;
    margin-top: 0.5rem;
    font-size: 0.6rem;
    font-weight: 600;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.1);
    color: var(--service-color);
}

/* ── Architecture Diagram ── */
.sl-arch {
    animation: fadeInUp 0.7s ease-out 0.3s backwards;
}

.sl-arch-diagram {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
}

.sl-arch-node {
    text-align: center;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: rgba(15, 23, 42, 0.6);
    min-width: 100px;
}

.sl-arch-node-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: #f1f5f9;
    margin-bottom: 0.2rem;
}

.sl-arch-node-tech {
    font-size: 0.6rem;
    color: var(--text-dim);
}

.sl-arch-node.highlight {
    border-color: var(--service-color);
    box-shadow: 0 0 12px rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.15);
}

.sl-arch-arrow {
    padding: 0 0.6rem;
    color: var(--text-dim);
    font-size: 1rem;
}

/* ── Flow Diagram ── */
.sl-flow {
    animation: fadeInUp 0.7s ease-out 0.35s backwards;
}

.sl-flow-steps {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0;
    overflow-x: auto;
}

.sl-flow-step {
    text-align: center;
    flex-shrink: 0;
    padding: 0.6rem 0.8rem;
}

.sl-flow-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(var(--glow-r, 59), var(--glow-g, 130), var(--glow-b, 246), 0.15);
    color: var(--service-color);
    font-size: 0.65rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.sl-flow-step-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: #f1f5f9;
    margin-bottom: 0.15rem;
    white-space: nowrap;
}

.sl-flow-step-desc {
    font-size: 0.6rem;
    color: var(--text-dim);
    white-space: nowrap;
}

.sl-flow-arrow {
    flex-shrink: 0;
    color: var(--text-dim);
    font-size: 0.85rem;
    padding: 0 0.3rem;
    opacity: 0.5;
}

/* ── Tech Stack ── */
.sl-tech {
    animation: fadeInUp 0.7s ease-out 0.4s backwards;
}

.sl-tech-list {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.sl-tech-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.75rem;
    border-radius: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: border-color 0.2s;
}

.sl-tech-badge:hover {
    border-color: rgba(148, 163, 184, 0.3);
}

.sl-tech-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

/* ── Connected Services ── */
.sl-connected {
    animation: fadeInUp 0.7s ease-out 0.45s backwards;
}

.sl-connected-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.7rem;
}

.sl-connected-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    text-decoration: none;
    transition: all 0.2s;
}

.sl-connected-card:hover {
    background: var(--card-bg-hover);
    border-color: rgba(148, 163, 184, 0.25);
    transform: translateY(-1px);
}

.sl-connected-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.sl-connected-info { flex: 1; }

.sl-connected-name {
    font-size: 0.78rem;
    font-weight: 700;
    color: #f1f5f9;
}

.sl-connected-role {
    font-size: 0.62rem;
    color: var(--text-dim);
}

.sl-connected-arrow {
    color: var(--text-dim);
    font-size: 0.8rem;
    transition: color 0.2s;
}

.sl-connected-card:hover .sl-connected-arrow {
    color: var(--service-color);
}

/* ── Footer ── */
.sl-footer {
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
    animation: fadeInUp 0.7s ease-out 0.5s backwards;
}

.sl-footer-inner {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.85rem 1.15rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.sl-footer-logo {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.sl-footer-text {
    font-size: 0.68rem;
    color: var(--text-dim);
}

.sl-footer-copy {
    font-size: 0.6rem;
    color: var(--text-dim);
}

/* ── Animations ── */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .sl-container { padding: 1.5rem 1rem 2rem; }
    .sl-hero h1 { font-size: 1.6rem; }
    .sl-hero { padding: 1.75rem 1rem; }
    .sl-features { grid-template-columns: repeat(2, 1fr); }
    .sl-arch-diagram { flex-direction: column; gap: 0; }
    .sl-arch-arrow { transform: rotate(90deg); padding: 0.3rem 0; }
    .sl-topnav { flex-direction: column; gap: 0.5rem; align-items: flex-start; }
}

@media (max-width: 480px) {
    .sl-features { grid-template-columns: 1fr; }
    .sl-connected-grid { grid-template-columns: 1fr; }
    .sl-flow-steps { padding: 1rem; }
    .sl-hero-actions { flex-direction: column; align-items: center; }
}