:root {
    --liquid-bg: #e2e8f0;
    --liquid-light: #ffffff;
    --liquid-dark: #94a3b8;
    --liquid-accent: #0ea5e9;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --shadow-out: 12px 12px 24px #c1c9d6, -12px -12px 24px #ffffff;
    --shadow-in: inset 6px 6px 12px #c1c9d6, inset -6px -6px 12px #ffffff;
    --font-stack: "Inter", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--liquid-bg);
    color: var(--text-main);
    font-family: var(--font-stack);
    padding: 40px 20px 100px;
    display: flex;
    justify-content: center;
}
a { text-decoration: none; color: inherit; }

/* The App Window */
.app-window {
    width: 100%;
    max-width: 1000px;
    background: var(--liquid-bg);
    border-radius: 40px;
    box-shadow: var(--shadow-out);
    overflow: hidden;
    position: relative;
    padding: 60px;
}

/* Window Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 60px;
}
.app-logo {
    font-size: 28px;
    font-weight: 900;
    color: var(--text-main);
    letter-spacing: -1px;
}
.app-logo span { color: var(--liquid-accent); }
.app-trust-badge {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 20px;
    box-shadow: var(--shadow-in);
}

/* Grid Content Area */
.app-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

/* Left Column */
.app-left {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.hero-card {
    background: var(--liquid-bg);
    box-shadow: var(--shadow-out);
    border-radius: 30px;
    padding: 40px;
}
.hero-card h1 { font-size: 48px; font-weight: 900; line-height: 1.1; margin-bottom: 20px; }
.hero-card p { font-size: 18px; color: var(--text-muted); margin-bottom: 30px; }
.btn-fluid {
    display: inline-block;
    padding: 15px 35px;
    border-radius: 30px;
    background: var(--liquid-bg);
    box-shadow: var(--shadow-out);
    font-weight: 700;
    color: var(--liquid-accent);
    transition: 0.2s;
    border: none;
    cursor: pointer;
}
.btn-fluid:active { box-shadow: var(--shadow-in); }

.features-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.f-item {
    background: var(--liquid-bg);
    box-shadow: var(--shadow-in);
    padding: 25px;
    border-radius: 20px;
}
.f-item h3 { font-size: 18px; margin-bottom: 10px; }
.f-item p { font-size: 14px; color: var(--text-muted); }

/* Right Column */
.app-right {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.stat-col {
    background: var(--liquid-bg);
    box-shadow: var(--shadow-out);
    border-radius: 30px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 30px;
    text-align: center;
}
.st-b { padding: 20px 0; border-bottom: 2px solid var(--liquid-light); }
.st-b:last-child { border-bottom: none; }
.st-num { font-size: 32px; font-weight: 900; color: var(--liquid-accent); }
.st-lbl { font-size: 13px; font-weight: 600; color: var(--text-muted); }

.node-cloud {
    background: var(--liquid-bg);
    box-shadow: var(--shadow-in);
    border-radius: 30px;
    padding: 30px;
}
.node-cloud h4 { text-align: center; margin-bottom: 20px; }
.cloud-tags {
    display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
}
.c-tag {
    padding: 8px 15px;
    border-radius: 15px;
    box-shadow: var(--shadow-out);
    font-size: 12px;
    font-weight: bold;
}

/* Reviews List */
.reviews-full { margin-top: 40px; }
.r-list { display: flex; flex-direction: column; gap: 20px; }
.r-row {
    background: var(--liquid-bg);
    box-shadow: var(--shadow-out);
    border-radius: 20px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
}
.r-ava {
    width: 50px; height: 50px; border-radius: 50%;
    box-shadow: var(--shadow-in);
    display: flex; justify-content: center; align-items: center; font-weight: bold;
}
.r-content { flex-grow: 1; }
.r-content span { color: #f59e0b; font-size: 14px; margin-bottom: 5px; display: block;}

/* Fixed Bottom Nav */
.bottom-nav {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--liquid-bg);
    box-shadow: var(--shadow-out);
    border-radius: 40px;
    display: flex;
    padding: 10px 20px;
    gap: 10px;
    z-index: 100;
}
.b-nav-item {
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 600;
    color: var(--text-muted);
    transition: 0.3s;
}
.b-nav-item:hover, .b-nav-item.active {
    box-shadow: var(--shadow-in);
    color: var(--liquid-accent);
}

@media (max-width: 900px) {
    .app-grid { grid-template-columns: 1fr; }
    .features-box { grid-template-columns: 1fr; }
    .app-window { padding: 30px; border-radius: 20px; }
    .bottom-nav { width: 90%; justify-content: space-around; padding: 10px; }
    .b-nav-item { padding: 10px; font-size: 13px; }
}