/* ============================================
   Response Bridge — Parent Hub
   Premium dark theme, indigo→cyan "bridging" palette.
   ============================================ */

:root {
    --primary: #6366f1;          /* indigo */
    --primary-dark: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.45);
    --secondary: #06b6d4;        /* cyan — "the other side of the bridge" */
    --secondary-glow: rgba(6, 182, 212, 0.4);
    --accent-violet: #8b5cf6;
    --accent-emerald: #10b981;

    --bg-dark: #0b1020;
    --bg-darker: #070b18;
    --bg-card: rgba(15, 23, 42, 0.6);
    --bg-card-strong: rgba(15, 23, 42, 0.85);

    --text-main: #f1f5f9;
    --text-mid: #cbd5e1;
    --text-muted: #94a3b8;

    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-hover: rgba(255, 255, 255, 0.18);

    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --radius: 1rem;
    --radius-lg: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
}

section[id] {
    scroll-margin-top: 5.5rem;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s, transform 0.2s, border-color 0.2s, background 0.2s;
}

button {
    cursor: pointer;
    border: none;
    font-family: inherit;
}

img { max-width: 100%; display: block; }

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-violet) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.gradient-text-2 {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--accent-emerald) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ===================== BUTTONS ===================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.95rem 1.6rem;
    border-radius: 0.85rem;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.btn-sm { padding: 0.55rem 1rem; font-size: 0.85rem; }

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-violet) 100%);
    color: #fff;
    box-shadow: 0 8px 24px -8px var(--primary-glow);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 32px -10px var(--primary-glow);
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--glass-border-hover);
}
.btn-outline:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.28);
}

/* ===================== NAVBAR ===================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 0;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    background: rgba(11, 16, 32, 0.6);
    border-bottom: 1px solid var(--glass-border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-main);
}
.logo svg {
    color: var(--secondary);
    filter: drop-shadow(0 0 10px var(--secondary-glow));
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.75rem;
    font-size: 0.92rem;
    color: var(--text-muted);
}
.nav-links a:not(.btn):hover { color: var(--text-main); }

@media (max-width: 720px) {
    .nav-links a:not(.btn) { display: none; }
}

/* ===================== HERO ===================== */

.hero {
    position: relative;
    padding: 9rem 0 6rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(circle at 50% 30%, black 0%, transparent 75%);
    -webkit-mask-image: radial-gradient(circle at 50% 30%, black 0%, transparent 75%);
}
.glow {
    position: absolute;
    border-radius: 9999px;
    filter: blur(120px);
    opacity: 0.55;
}
.glow-1 {
    top: -120px;
    left: 15%;
    width: 480px;
    height: 480px;
    background: var(--primary);
}
.glow-2 {
    top: 80px;
    right: 10%;
    width: 420px;
    height: 420px;
    background: var(--secondary);
}

.hero-inner {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.9rem;
    border-radius: 9999px;
    background: rgba(99, 102, 241, 0.12);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: #c7d2fe;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}
.hero-eyebrow .dot {
    height: 6px; width: 6px;
    background: var(--primary);
    border-radius: 9999px;
    box-shadow: 0 0 10px var(--primary-glow);
}

.hero-title {
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.02em;
    max-width: 920px;
    margin: 0 auto;
}

.hero-sub {
    margin: 1.75rem auto 0;
    max-width: 720px;
    color: var(--text-mid);
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.85rem;
    margin-top: 2.25rem;
}

.hero-trust {
    margin-top: 2.5rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.78rem;
}
.hero-trust .check { color: var(--secondary); margin-right: 0.3rem; }

/* ===================== SECTION ===================== */

.section {
    padding: 6rem 0;
    position: relative;
}
.section-alt {
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.04) 0%, transparent 100%);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}

.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 3.5rem;
}
.section-tag {
    display: inline-block;
    padding: 0.3rem 0.9rem;
    border-radius: 9999px;
    background: rgba(99, 102, 241, 0.12);
    color: #c7d2fe;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: 1px solid rgba(99, 102, 241, 0.3);
    margin-bottom: 1rem;
}
.section-header h2 {
    font-size: clamp(1.6rem, 3vw, 2.5rem);
    font-weight: 800;
    line-height: 1.18;
    letter-spacing: -0.02em;
}
.section-header p {
    margin-top: 1rem;
    color: var(--text-muted);
}

/* ===================== PRODUCT GRID ===================== */

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.product-card {
    display: flex;
    flex-direction: column;
    padding: 1.75rem;
    border-radius: var(--radius);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
    position: relative;
    overflow: hidden;
    color: var(--text-main);
}
.product-card::before {
    content: "";
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, transparent 0%, transparent 60%, var(--brand-color, var(--primary)) 100%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    border-radius: inherit;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    padding: 1px;
}
.product-card:hover {
    transform: translateY(-4px);
    border-color: var(--glass-border-hover);
    background: var(--bg-card-strong);
}
.product-card:hover::before { opacity: 0.6; }

.product-card[data-brand="sentendra"]      { --brand-color: #0d9488; }
.product-card[data-brand="detectionlint"]  { --brand-color: var(--accent-violet); }
.product-card[data-brand="visutrack"]      { --brand-color: var(--secondary); }
.product-card[data-brand="casebridge"]     { --brand-color: #f59e0b; }
.product-card[data-brand="dummifai"]       { --brand-color: var(--accent-emerald); }

.product-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}
.product-icon {
    height: 42px;
    width: 42px;
    border-radius: 0.65rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
    color: var(--brand-color);
}
.product-domain {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
}

.product-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.25rem;
}
.product-tag {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--brand-color);
    margin-bottom: 0.9rem;
}
.product-body {
    color: var(--text-muted);
    font-size: 0.93rem;
    line-height: 1.65;
    flex-grow: 1;
}
.product-cta {
    margin-top: 1.25rem;
    color: var(--text-main);
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}
.product-cta .arr { transition: transform 0.2s; display: inline-block; }
.product-card:hover .product-cta .arr { transform: translateX(4px); }

/* ===================== BRIDGE GRID ===================== */

.bridge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
}

.bridge-card {
    padding: 1.5rem;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}
.bridge-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}
.bridge-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
}
.bridge-num {
    font-family: var(--font-mono);
    color: var(--secondary);
    font-size: 0.78rem;
    margin-bottom: 0.75rem;
    letter-spacing: 0.08em;
}

/* ===================== STACK ===================== */

.stack-grid {
    max-width: 800px;
    margin: 0 auto;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    overflow: hidden;
}
.stack-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.1rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    gap: 1rem;
}
.stack-row:last-child { border-bottom: 0; }
.stack-label {
    font-weight: 600;
    color: var(--text-main);
}
.stack-val {
    color: var(--text-muted);
    font-size: 0.92rem;
    font-family: var(--font-mono);
    text-align: right;
}

/* ===================== PRICING (pricing.html) ===================== */

.pricing-stack {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    max-width: 920px;
    margin: 0 auto;
}
.pricing-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
    padding: 1.25rem 1.5rem;
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid var(--glass-border, rgba(255, 255, 255, 0.08));
    border-radius: 1rem;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s, transform 0.2s, background 0.2s;
    position: relative;
    overflow: hidden;
}
.pricing-row::before {
    content: '';
    position: absolute; inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, transparent, var(--brand-color, var(--primary)) 50%, transparent);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}
.pricing-row:hover { border-color: rgba(255,255,255,0.18); transform: translateY(-2px); }
.pricing-row:hover::before { opacity: 0.45; }
.pricing-row[data-brand="sentendra"]     { --brand-color: #0d9488; }
.pricing-row[data-brand="detectionlint"] { --brand-color: #8b5cf6; }
.pricing-row[data-brand="visutrack"]     { --brand-color: #6366f1; }
.pricing-row[data-brand="casebridge"]    { --brand-color: #3b82f6; }
.pricing-row[data-brand="dummifai"]      { --brand-color: #10b981; }
.pricing-row-brand {
    flex: 1 1 220px;
    min-width: 200px;
    display: flex; flex-direction: column; gap: 0.2rem;
}
.pricing-row-name { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em; }
.pricing-row-tag { color: var(--text-muted); font-size: 0.85rem; }
.pricing-row-plans {
    flex: 1 1 320px;
    display: flex; flex-wrap: wrap; gap: 0.4rem;
}
.pricing-pill {
    padding: 0.25rem 0.7rem;
    font-size: 0.78rem;
    font-family: var(--font-mono, ui-monospace, monospace);
    color: var(--text-mid, #cbd5e1);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--glass-border, rgba(255,255,255,0.08));
    border-radius: 999px;
    white-space: nowrap;
}
.pricing-pill--primary {
    color: #fff;
    background: color-mix(in srgb, var(--brand-color, var(--primary)) 24%, transparent);
    border-color: color-mix(in srgb, var(--brand-color, var(--primary)) 55%, transparent);
}
.pricing-row-cta {
    color: var(--text-muted);
    font-size: 0.85rem;
    white-space: nowrap;
}
.pricing-row:hover .pricing-row-cta { color: var(--text-main, #f1f5f9); }
.pricing-stack-footnote {
    max-width: 720px;
    margin: 2.5rem auto 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===================== CTA ===================== */

.cta-section {
    padding: 6rem 0;
    text-align: center;
    background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.12) 0%, transparent 60%);
}
.cta-inner h2 {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}
.cta-inner p {
    color: var(--text-muted);
    margin: 1rem auto 2rem;
    max-width: 560px;
}
.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.85rem;
}

/* ===================== FOOTER ===================== */

.footer {
    padding-top: 3.5rem;
    border-top: 1px solid var(--glass-border);
    background: var(--bg-darker);
}
.footer-inner {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    padding-bottom: 2.5rem;
}
@media (max-width: 720px) {
    .footer-inner { grid-template-columns: 1fr; }
}
.footer-brand .logo { margin-bottom: 0.75rem; }
.footer-tag {
    color: var(--text-muted);
    font-size: 0.92rem;
    max-width: 280px;
}
.footer-cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 2rem;
}
.footer-col h5 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text-main);
    margin-bottom: 0.85rem;
}
.footer-col a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.25rem 0;
}
.footer-col a:hover { color: var(--text-main); }

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 0.8rem;
    font-family: var(--font-mono);
}
.footer-bottom .muted { opacity: 0.7; }