:root {
    --background: #050913;
    --background-soft: #08101d;
    --surface: #0d1625;
    --surface-light: #111d2f;
    --surface-hover: #142238;

    --border: #223149;
    --border-bright: #2d4665;

    --text-primary: #edf6ff;
    --text-secondary: #a8b6c9;
    --text-muted: #718096;

    --accent: #00d4ff;
    --accent-light: #67e8f9;
    --accent-dark: #008fb3;
    --accent-soft: rgba(0, 212, 255, 0.1);

    --success: #22c55e;
    --warning: #f59e0b;

    --container-width: 1200px;
    --navbar-height: 76px;

    --radius-small: 10px;
    --radius-medium: 16px;
    --radius-large: 24px;

    --shadow-small:
        0 10px 30px rgba(0, 0, 0, 0.18);

    --shadow-large:
        0 24px 60px rgba(0, 0, 0, 0.32);

    --transition:
        0.25s ease;
}


/* =========================
   Reset
========================= */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--navbar-height) + 24px);
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    background:
        radial-gradient(
            circle at 50% -10%,
            rgba(0, 212, 255, 0.12),
            transparent 34%
        ),
        var(--background);
    color: var(--text-primary);
    font-family:
        Inter,
        "Segoe UI",
        Arial,
        sans-serif;
    line-height: 1.6;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background-image:
        linear-gradient(
            rgba(255, 255, 255, 0.025) 1px,
            transparent 1px
        ),
        linear-gradient(
            90deg,
            rgba(255, 255, 255, 0.025) 1px,
            transparent 1px
        );
    background-size: 48px 48px;
    mask-image:
        linear-gradient(
            to bottom,
            black,
            transparent 88%
        );
}

body::after {
    content: "";
    position: fixed;
    top: 12%;
    left: 50%;
    width: 520px;
    height: 520px;
    z-index: -1;
    pointer-events: none;
    background: rgba(0, 212, 255, 0.05);
    border-radius: 50%;
    filter: blur(110px);
    transform: translateX(-50%);
}

a {
    color: inherit;
    text-decoration: none;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

ul {
    list-style: none;
}

section {
    width: min(
        calc(100% - 40px),
        var(--container-width)
    );
    margin-inline: auto;
    padding-block: 110px;
}


/* =========================
   Navigation
========================= */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;

    width: 100%;
    min-height: var(--navbar-height);

    padding-inline: max(
        24px,
        calc((100% - var(--container-width)) / 2)
    );

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;

    background:
        rgba(5, 9, 19, 0.82);

    border-bottom:
        1px solid rgba(255, 255, 255, 0.07);

    backdrop-filter: blur(18px);
}

.logo h2 {
    color: var(--accent);
    font-size: 24px;
    letter-spacing: -0.04em;
}

.logo h2::before {
    content: "◈";
    margin-right: 10px;
    font-size: 18px;
}

.navbar nav ul {
    display: flex;
    align-items: center;
    gap: 30px;
}

.navbar nav a {
    position: relative;

    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;

    transition:
        color var(--transition);
}

.navbar nav a::after {
    content: "";

    position: absolute;
    left: 0;
    bottom: -8px;

    width: 100%;
    height: 2px;

    background: var(--accent);

    transform: scaleX(0);
    transform-origin: center;

    transition:
        transform var(--transition);
}

.navbar nav a:hover,
.navbar nav a.active {
    color: var(--text-primary);
}

.navbar nav a:hover::after,
.navbar nav a.active::after {
    transform: scaleX(1);
}

.version {
    padding: 7px 12px;

    color: var(--accent-light);
    background: var(--accent-soft);

    border:
        1px solid rgba(0, 212, 255, 0.22);

    border-radius: 999px;

    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
}


/* =========================
   Hero
========================= */

.hero {
    min-height:
        calc(100vh - var(--navbar-height));

    padding-top: 120px;
    padding-bottom: 120px;

    display: flex;
    align-items: center;
    justify-content: center;

    text-align: center;
}

.hero-content {
    width: min(850px, 100%);
}

.hero-tag {
    width: fit-content;
    margin: 0 auto 24px;
    padding: 8px 14px;

    color: var(--accent-light);
    background: var(--accent-soft);

    border:
        1px solid rgba(0, 212, 255, 0.22);

    border-radius: 999px;

    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.14em;
}

.hero h1 {
    max-width: 900px;
    margin-inline: auto;

    font-size:
        clamp(48px, 7vw, 84px);

    line-height: 1.03;
    letter-spacing: -0.055em;

    background:
        linear-gradient(
            135deg,
            #ffffff 20%,
            #b9f5ff 58%,
            var(--accent) 100%
        );

    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.hero-description {
    max-width: 700px;
    margin: 28px auto 0;

    color: var(--text-secondary);

    font-size:
        clamp(17px, 2vw, 21px);

    line-height: 1.75;
}

.hero-buttons {
    margin-top: 38px;

    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.primary-btn,
.secondary-btn {
    min-width: 160px;
    min-height: 50px;
    padding: 13px 22px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    border-radius: var(--radius-small);

    font-size: 15px;
    font-weight: 700;

    transition:
        transform var(--transition),
        background var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

.primary-btn {
    color: #00141a;
    background: var(--accent);

    box-shadow:
        0 12px 35px
        rgba(0, 212, 255, 0.22);
}

.primary-btn:hover {
    background: var(--accent-light);
    transform: translateY(-2px);

    box-shadow:
        0 18px 45px
        rgba(0, 212, 255, 0.3);
}

.secondary-btn {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.035);

    border:
        1px solid var(--border);
}

.secondary-btn:hover {
    background: var(--surface-hover);
    border-color: var(--border-bright);
    transform: translateY(-2px);
}


/* =========================
   Shared Section Heading
========================= */

.section-heading {
    max-width: 720px;
    margin: 0 auto 50px;

    text-align: center;
}

.section-heading h2 {
    font-size:
        clamp(34px, 5vw, 50px);

    line-height: 1.15;
    letter-spacing: -0.04em;
}

.section-heading p {
    margin-top: 16px;

    color: var(--text-secondary);
    font-size: 17px;
    line-height: 1.7;
}


/* =========================
   Module Cards
========================= */

.modules-section {
    position: relative;
}

.module-grid {
    display: grid;
    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 24px;
}

.module-card {
    position: relative;
    overflow: hidden;

    min-height: 330px;
    padding: 32px;

    display: flex;
    flex-direction: column;
    align-items: flex-start;

    background:
        linear-gradient(
            145deg,
            rgba(17, 29, 47, 0.96),
            rgba(10, 18, 31, 0.96)
        );

    border:
        1px solid var(--border);

    border-radius: var(--radius-large);

    box-shadow: var(--shadow-small);

    transition:
        transform var(--transition),
        border-color var(--transition),
        box-shadow var(--transition);
}

.module-card[data-href] {
    cursor: pointer;
}

.module-card[data-href]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

.module-card::before {
    content: "";

    position: absolute;
    top: -90px;
    right: -90px;

    width: 220px;
    height: 220px;

    background: rgba(0, 212, 255, 0.08);
    border-radius: 50%;
    filter: blur(30px);

    transition:
        transform 0.35s ease,
        opacity 0.35s ease;
}

.module-card:hover {
    border-color:
        rgba(0, 212, 255, 0.48);

    transform: translateY(-7px);

    box-shadow:
        0 24px 60px rgba(0, 0, 0, 0.34),
        0 0 35px rgba(0, 212, 255, 0.08);
}

.module-card:hover::before {
    opacity: 1;
    transform: scale(1.18);
}

.module-icon {
    position: relative;
    z-index: 1;

    width: 58px;
    height: 58px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    color: var(--accent);
    background: var(--accent-soft);

    border:
        1px solid rgba(0, 212, 255, 0.18);

    border-radius: 15px;

    font-size: 27px;
    font-weight: 800;
}

.module-icon svg {
    width: 28px;
    height: 28px;

    fill: none;
    stroke: var(--accent);
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.module-card h3 {
    position: relative;
    z-index: 1;

    margin-top: 24px;

    font-size: 25px;
    letter-spacing: -0.03em;
}

.module-card p {
    position: relative;
    z-index: 1;

    margin-top: 14px;
    margin-bottom: 28px;

    color: var(--text-secondary);
    line-height: 1.75;
}

.module-button {
    position: relative;
    z-index: 1;

    margin-top: auto;
    padding: 11px 0;

    display: inline-flex;
    align-items: center;
    gap: 9px;

    color: var(--accent-light);

    font-size: 14px;
    font-weight: 800;
}

.module-button::after {
    content: "→";

    font-size: 18px;

    transition:
        transform var(--transition);
}

.module-button:hover::after {
    transform: translateX(5px);
}


/* =========================
   Capabilities
========================= */

.capabilities {
    width: 100%;
    max-width: none;

    padding-inline: max(
        20px,
        calc((100% - var(--container-width)) / 2)
    );

    background:
        linear-gradient(
            to bottom,
            transparent,
            rgba(13, 22, 37, 0.58),
            transparent
        );
}

.capability-grid {
    width: 100%;

    display: grid;
    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 18px;
}

.capability-card {
    min-height: 220px;
    padding: 26px;

    background:
        rgba(13, 22, 37, 0.78);

    border:
        1px solid var(--border);

    border-radius: var(--radius-medium);

    transition:
        background var(--transition),
        border-color var(--transition),
        transform var(--transition);
}

.capability-card:hover {
    background: var(--surface-light);
    border-color:
        rgba(0, 212, 255, 0.38);

    transform: translateY(-4px);
}

.capability-card h3 {
    color: var(--accent-light);
    font-size: 19px;
}

.capability-card p {
    margin-top: 14px;

    color: var(--text-secondary);
    line-height: 1.7;
}


/* =========================
   Architecture
========================= */

.architecture-diagram {
    max-width: 980px;
    margin-inline: auto;
    padding: 36px;

    display: grid;
    gap: 28px;

    background:
        rgba(8, 16, 29, 0.78);

    border:
        1px solid var(--border);

    border-radius: var(--radius-large);

    box-shadow: var(--shadow-large);
}

.architecture-box {
    position: relative;

    max-width: 430px;
    width: 100%;
    min-height: 70px;
    margin-inline: auto;
    padding: 18px 24px;

    display: flex;
    align-items: center;
    justify-content: center;

    background:
        linear-gradient(
            135deg,
            rgba(17, 29, 47, 0.96),
            rgba(9, 17, 29, 0.96)
        );

    border:
        1px solid var(--border-bright);

    border-radius: var(--radius-medium);

    color: var(--text-primary);

    font-size: 17px;
    font-weight: 800;
    text-align: center;

    transition:
        border-color var(--transition),
        box-shadow var(--transition),
        transform var(--transition);
}

.architecture-box:hover {
    border-color: var(--accent);

    box-shadow:
        0 0 30px
        rgba(0, 212, 255, 0.12);

    transform: translateY(-3px);
}

.architecture-box:not(:last-child)::after {
    content: "";

    position: absolute;
    left: 50%;
    bottom: -29px;

    width: 2px;
    height: 28px;

    background:
        linear-gradient(
            var(--accent),
            rgba(0, 212, 255, 0.1)
        );

    transform: translateX(-50%);
}

.architecture-row {
    position: relative;

    display: grid;
    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 14px;
}

.architecture-row::before,
.architecture-row::after {
    content: "";

    position: absolute;
    left: 50%;

    width: 2px;

    background:
        rgba(0, 212, 255, 0.55);

    transform: translateX(-50%);
}

.architecture-row::before {
    top: -28px;
    height: 28px;
}

.architecture-row::after {
    bottom: -28px;
    height: 28px;
}

.architecture-row div {
    min-height: 88px;
    padding: 16px;

    display: flex;
    align-items: center;
    justify-content: center;

    background: var(--surface);

    border:
        1px solid var(--border);

    border-radius: var(--radius-small);

    color: var(--text-secondary);

    font-size: 14px;
    font-weight: 700;
    text-align: center;

    transition:
        color var(--transition),
        border-color var(--transition),
        background var(--transition),
        transform var(--transition);
}

.architecture-row div:hover,
.architecture-row div.active {
    color: var(--accent-light);
    background: var(--surface-hover);

    border-color:
        rgba(0, 212, 255, 0.48);

    transform: translateY(-4px);
}


/* =========================
   Roadmap
========================= */

.roadmap-wrapper {
    max-width: 900px;
    margin-inline: auto;

    display: grid;
    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 24px;
}

.current,
.future {
    padding: 32px;

    background: var(--surface);

    border:
        1px solid var(--border);

    border-radius: var(--radius-large);
}

.current h3,
.future h3 {
    font-size: 22px;
    letter-spacing: -0.025em;
}

.current h3 {
    color: var(--accent-light);
}

.future h3 {
    color: var(--text-secondary);
}

.current ul,
.future ul {
    margin-top: 22px;

    display: grid;
    gap: 13px;
}

.current li,
.future li {
    min-height: 48px;
    padding: 12px 14px;

    display: flex;
    align-items: center;
    gap: 10px;

    background: var(--background-soft);

    border:
        1px solid rgba(255, 255, 255, 0.055);

    border-radius: var(--radius-small);

    color: var(--text-secondary);
}

.current li {
    color: #baf7cc;
}

.future li::before {
    content: "○";

    color: var(--text-muted);
}


/* =========================
   About
========================= */

.about {
    max-width: 850px;
    text-align: center;
}

.about > p:first-of-type {
    max-width: 700px;
    margin: 0 auto;

    color: var(--text-secondary);
    font-size: 18px;
    line-height: 1.8;
}

.about h3 {
    margin-top: 34px;

    color: var(--text-muted);

    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.about h3 + p {
    margin-top: 10px;

    color: var(--accent-light);
    font-size: 21px;
    font-weight: 800;
}


/* =========================
   Footer
========================= */

footer {
    width: min(
        calc(100% - 40px),
        var(--container-width)
    );

    margin-inline: auto;
    padding-block: 42px;

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;

    border-top:
        1px solid rgba(255, 255, 255, 0.08);
}

footer h2 {
    color: var(--accent);
    font-size: 20px;
}

footer p {
    color: var(--text-muted);
    font-size: 13px;
}


/* =========================
   Reveal Animation Classes
========================= */

.reveal {
    opacity: 0;
    transform: translateY(28px);

    transition:
        opacity 0.7s ease,
        transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}


/* =========================
   Scrollbar
========================= */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--background);
}

::-webkit-scrollbar-thumb {
    background: var(--border-bright);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-dark);
}


/* =========================
   Tablet
========================= */

@media (max-width: 1000px) {
    .capability-grid {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

    .architecture-row {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }
}


/* =========================
   Mobile Navigation
========================= */

@media (max-width: 820px) {
    .navbar {
        min-height: auto;
        padding-block: 16px;
        flex-wrap: wrap;
    }

    .navbar nav {
        order: 3;
        width: 100%;
        overflow-x: auto;
    }

    .navbar nav ul {
        width: max-content;
        min-width: 100%;

        justify-content: center;
        gap: 22px;

        padding-bottom: 3px;
    }

    .navbar nav a {
        white-space: nowrap;
    }

    .hero {
        min-height: auto;
        padding-top: 100px;
    }

    .module-grid {
        grid-template-columns: 1fr;
    }

    .module-card {
        min-height: 300px;
    }

    .architecture-diagram {
        padding: 24px;
    }

    .roadmap-wrapper {
        grid-template-columns: 1fr;
    }
}


/* =========================
   Small Mobile
========================= */

@media (max-width: 600px) {
    section {
        width:
            min(calc(100% - 28px), var(--container-width));

        padding-block: 78px;
    }

    .navbar {
        padding-inline: 16px;
    }

    .logo h2 {
        font-size: 21px;
    }

    .version {
        font-size: 10px;
    }

    .navbar nav ul {
        justify-content: flex-start;
    }

    .hero {
        padding-top: 80px;
        padding-bottom: 90px;
    }

    .hero h1 {
        font-size: 46px;
    }

    .hero-description {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
    }

    .module-card,
    .current,
    .future {
        padding: 24px;
    }

    .capabilities {
        padding-inline: 14px;
    }

    .capability-grid {
        grid-template-columns: 1fr;
    }

    .capability-card {
        min-height: auto;
    }

    .architecture-diagram {
        padding: 18px;
    }

    .architecture-row {
        grid-template-columns: 1fr;
    }

    footer {
        padding-block: 34px;
        flex-direction: column;
        text-align: center;
    }
}

.mission {
    max-width: 700px;
    margin: 34px auto 0;
    padding: 24px;

    background:
        rgba(13, 22, 37, 0.72);

    border:
        1px solid var(--border);

    border-radius:
        var(--radius-medium);
}

.mission h3 {
    margin-top: 0;

    color:
        var(--accent-light);

    font-size: 15px;
    letter-spacing: 0.08em;
}

.mission p {
    margin-top: 12px;

    color:
        var(--text-secondary);

    font-size: 16px;
    line-height: 1.75;
}

/* ============================
   FAQ
============================ */

.faq-section {
    padding: 120px 0;
}

.faq-container {
    max-width: 900px;
    margin: 60px auto 0;
}

.faq-item {
    background: rgba(18, 25, 40, 0.65);
    border: 1px solid rgba(0, 212, 255, 0.15);
    border-radius: 14px;
    margin-bottom: 18px;
    overflow: hidden;
    transition: 0.3s;
}

.faq-item:hover {
    border-color: rgba(0,212,255,.4);
}

.faq-item summary {
    cursor: pointer;
    list-style: none;
    padding: 22px 28px;
    font-size: 18px;
    font-weight: 600;
    color: #ffffff;
    position: relative;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    position: absolute;
    right: 28px;
    font-size: 24px;
    color: #00d4ff;
    transition: .3s;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 28px 24px;
    line-height: 1.8;
    color: #b7c4d4;
}

/* Improve initial rendering performance on mobile */
@media (max-width: 600px) {
    body::after {
        display: none;
    }

    .navbar {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
}