:root {
    --bg: #07111f;
    --bg-soft: #0d1a2d;
    --bg-card: rgba(13, 25, 45, 0.72);
    --surface: #f4f7fb;
    --surface-card: #ffffff;
    --text: #e8eef8;
    --text-muted: rgba(232, 238, 248, 0.72);
    --text-dark: #142033;
    --text-dark-muted: #5d6b82;
    --border: rgba(148, 163, 184, 0.16);
    --accent: #69d7ff;
    --accent-strong: #00b7ff;
    --accent-warm: #ffb86c;
    --shadow-lg: 0 24px 60px rgba(3, 9, 20, 0.34);
    --shadow-md: 0 18px 40px rgba(7, 17, 31, 0.16);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 16px;
    --nav-height: 76px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "SF Pro Display", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

button {
    font: inherit;
}

.container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(7, 17, 31, 0.68);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(16px);
    transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.navbar.scrolled {
    background: rgba(7, 17, 31, 0.88);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}

.nav-container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    min-height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.nav-logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
}

.logo-img,
.footer-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.28);
}

.logo-text,
.footer-logo-text {
    font-size: 1.25rem;
    letter-spacing: 0.02em;
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    color: rgba(232, 238, 248, 0.82);
    font-size: 0.98rem;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #ffffff;
}

.hamburger {
    display: none;
    border: 0;
    background: transparent;
    cursor: pointer;
    padding: 0;
    position: relative;
    z-index: 1002;
}

.bar {
    display: block;
    width: 24px;
    height: 2px;
    margin: 5px 0;
    background: #ffffff;
    border-radius: 999px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.hero {
    position: relative;
    padding-top: calc(var(--nav-height) + 18px);
    padding-bottom: 18px;
    min-height: auto;
    overflow: clip;
    background:
        radial-gradient(circle at top left, rgba(105, 215, 255, 0.26), transparent 34%),
        radial-gradient(circle at 85% 20%, rgba(255, 184, 108, 0.18), transparent 24%),
        linear-gradient(180deg, #07111f 0%, #0a1423 50%, #0b1628 100%);
}

.hero-backdrop {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(120deg, rgba(105, 215, 255, 0.06), transparent 42%),
        linear-gradient(300deg, rgba(255, 184, 108, 0.08), transparent 32%);
    pointer-events: none;
}

.hero-container {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.14fr) minmax(280px, 0.76fr);
    gap: 30px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 640px;
}

.hero-kicker,
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(105, 215, 255, 0.12);
    border: 1px solid rgba(105, 215, 255, 0.18);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.hero-title {
    margin-top: 14px;
    font-size: clamp(2.15rem, 4.3vw, 3.6rem);
    line-height: 1.06;
    letter-spacing: -0.04em;
}

.hero-description,
.section-description,
.footer-description,
.about-item p,
.faq-item p,
.check-list li,
.status-card p,
.screenshot-copy p,
.feature-description,
.info-card p,
.store-note,
.about-subtitle,
.contact-list li {
    color: var(--text-muted);
}

.hero-description {
    margin-top: 14px;
    font-size: 0.95rem;
    max-width: 520px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 18px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 132px;
    padding: 12px 18px;
    border-radius: 999px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    color: #04111d;
    background: linear-gradient(135deg, var(--accent) 0%, #b8f1ff 100%);
    box-shadow: 0 16px 40px rgba(105, 215, 255, 0.28);
}

.btn-secondary {
    border: 1px solid rgba(232, 238, 248, 0.16);
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.hero-meta {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.meta-card,
.info-card,
.status-card,
.faq-item,
.feature-card,
.store-card,
.about-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.meta-card {
    padding: 12px 14px 14px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
}

.meta-label,
.info-label,
.store-platform {
    display: block;
    margin-bottom: 6px;
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: rgba(232, 238, 248, 0.58);
}

.meta-note {
    margin-top: 6px;
    color: rgba(232, 238, 248, 0.68);
    font-size: 0.82rem;
    line-height: 1.45;
}

.hero-visual {
    position: relative;
}

.device-showcase {
    position: relative;
    width: min(100%, 320px);
    margin-left: auto;
}

.device-frame {
    position: relative;
    padding: 10px;
    border-radius: 28px;
    background: linear-gradient(180deg, #17233b 0%, #0b1324 100%);
    box-shadow: 0 26px 56px rgba(1, 5, 12, 0.46);
}

.device-frame::before {
    content: "";
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 32%;
    height: 14px;
    border-radius: 0 0 10px 10px;
    background: #0a1120;
    z-index: 2;
}

.device-screen {
    width: 100%;
    aspect-ratio: 1280 / 2832;
    object-fit: cover;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.trust-strip {
    width: min(1180px, calc(100% - 40px));
    margin: 14px auto 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.trust-item {
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(232, 238, 248, 0.84);
    font-size: 0.82rem;
}

.section {
    padding: 108px 0;
}

.section-dark {
    background: linear-gradient(180deg, #091424 0%, #0b1629 100%);
}

.section-light {
    background:
        radial-gradient(circle at top, rgba(105, 215, 255, 0.08), transparent 22%),
        linear-gradient(180deg, #f5f8fc 0%, #eef3f9 100%);
    color: var(--text-dark);
}

.section-download {
    background:
        radial-gradient(circle at top right, rgba(105, 215, 255, 0.12), transparent 22%),
        linear-gradient(180deg, #08111f 0%, #0c1830 100%);
}

.section-light .section-eyebrow {
    background: rgba(0, 183, 255, 0.08);
    border-color: rgba(0, 183, 255, 0.14);
    color: #008bc5;
}

.section-heading {
    max-width: 760px;
    margin: 0 auto 48px;
    text-align: center;
}

.section-title {
    margin-top: 18px;
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.12;
    letter-spacing: -0.03em;
}

.section-dark .section-title {
    color: #ffffff;
}

.section-light .section-title,
.section-light .feature-title,
.section-light .screenshot-copy h3,
.section-light .status-card h3,
.section-light .faq-item h3,
.section-light .footer-title,
.section-light .about-item h2 {
    color: var(--text-dark);
}

.section-light .section-description,
.section-light .feature-description,
.section-light .screenshot-copy p,
.section-light .status-card p,
.section-light .faq-item p,
.section-light .about-item p,
.section-light .check-list li,
.section-light .store-note {
    color: var(--text-dark-muted);
}

.feature-grid,
.status-grid,
.faq-list {
    display: grid;
    gap: 22px;
}

.feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
    min-height: 220px;
    padding: 26px;
    background: linear-gradient(180deg, rgba(16, 29, 49, 0.96), rgba(12, 22, 38, 0.92));
}

.section-light .feature-card,
.section-light .status-card,
.section-light .faq-item,
.section-light .about-item,
.section-light .info-card,
.section-light .store-card {
    background: rgba(255, 255, 255, 0.88);
    box-shadow: var(--shadow-md);
}

.feature-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: rgba(105, 215, 255, 0.14);
    color: var(--accent);
    font-weight: 800;
}

.feature-title {
    margin-top: 18px;
    color: #ffffff;
    font-size: 1.24rem;
}

.feature-description {
    margin-top: 10px;
    font-size: 0.98rem;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
}

.screenshot-card {
    background: linear-gradient(180deg, #0f1b2f 0%, #14233b 100%);
    border: 1px solid rgba(20, 32, 51, 0.12);
    border-radius: 22px;
    overflow: hidden;
    box-shadow: 0 20px 44px rgba(8, 17, 31, 0.16);
    padding: 14px;
}

.screenshot-img {
    width: 100%;
    aspect-ratio: 1280 / 2832;
    object-fit: cover;
    background: #eef3f9;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.screenshot-copy {
    margin-top: 14px;
    padding: 18px 18px 20px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
}

.screenshot-copy h3 {
    font-size: 1.08rem;
    color: #f7fbff;
}

.screenshot-copy p {
    margin-top: 8px;
    font-size: 0.95rem;
    color: rgba(232, 238, 248, 0.74);
}

.section-light .screenshot-card .screenshot-copy h3 {
    color: #f7fbff;
}

.section-light .screenshot-card .screenshot-copy p {
    color: rgba(232, 238, 248, 0.74);
}

.split-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 30px;
    align-items: start;
}

.section-acknowledgement {
    padding-top: 0;
}

.acknowledgement-card {
    max-width: 920px;
    margin: 0 auto;
    padding: 28px 30px;
    border: 1px solid rgba(105, 215, 255, 0.18);
    border-radius: 24px;
    background:
        linear-gradient(135deg, rgba(105, 215, 255, 0.08), rgba(255, 184, 108, 0.08)),
        rgba(255, 255, 255, 0.03);
    box-shadow: 0 18px 40px rgba(4, 10, 20, 0.22);
    text-align: center;
}

.acknowledgement-card .section-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.acknowledgement-card .section-description {
    max-width: 720px;
    margin: 16px auto 0;
}

.check-list {
    list-style: none;
    margin-top: 24px;
    display: grid;
    gap: 14px;
}

.check-list li {
    position: relative;
    padding-left: 28px;
}

.check-list li::before {
    content: "";
    position: absolute;
    top: 10px;
    left: 0;
    width: 12px;
    height: 12px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #b8f1ff);
    box-shadow: 0 0 0 6px rgba(105, 215, 255, 0.08);
}

.info-panel {
    display: grid;
    gap: 18px;
}

.info-card {
    padding: 22px;
    background: rgba(255, 255, 255, 0.04);
}

.info-card strong {
    color: #ffffff;
    display: block;
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.status-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.status-card {
    padding: 24px;
}

.status-card h3 {
    margin-top: 18px;
    font-size: 1.16rem;
}

.status-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 700;
}

.status-tag.done {
    background: rgba(10, 180, 135, 0.12);
    color: #00926d;
}

.status-tag.doing {
    background: rgba(255, 184, 108, 0.18);
    color: #b06800;
}

.download-panel {
    display: grid;
    gap: 30px;
}

.download-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.store-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 22px;
    background: rgba(255, 255, 255, 0.05);
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.store-card strong {
    font-size: 1.16rem;
    color: #ffffff;
}

.store-card:hover {
    transform: translateY(-4px);
    border-color: rgba(105, 215, 255, 0.24);
    background: rgba(255, 255, 255, 0.08);
}

.store-card.disabled {
    cursor: default;
    opacity: 0.8;
}

.store-card.disabled:hover {
    transform: none;
    border-color: var(--border);
    background: rgba(255, 255, 255, 0.05);
}

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

.faq-item {
    padding: 24px;
    background: rgba(255, 255, 255, 0.04);
}

.faq-item h3 {
    margin-bottom: 10px;
    color: #ffffff;
    font-size: 1.12rem;
}

.footer {
    background: #060e1b;
    padding: 54px 0 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-content {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 0.7fr));
    gap: 26px;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.footer-brand .footer-description {
    margin-top: 16px;
    max-width: 420px;
}

.footer-title {
    margin-bottom: 14px;
    color: #ffffff;
    font-size: 1rem;
}

.footer-links {
    list-style: none;
    display: grid;
    gap: 10px;
}

.footer-links a {
    color: rgba(232, 238, 248, 0.72);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
}

.footer-copyright {
    color: rgba(232, 238, 248, 0.52);
}

.about-section {
    padding: calc(var(--nav-height) + 44px) 0 80px;
    background:
        radial-gradient(circle at top, rgba(105, 215, 255, 0.08), transparent 18%),
        linear-gradient(180deg, #0a1323 0%, #0d1728 100%);
}

.about-header {
    max-width: 760px;
    margin: 0 auto 42px;
    text-align: center;
}

.about-header h1 {
    font-size: clamp(2.4rem, 4vw, 3.6rem);
}

.about-subtitle {
    margin-top: 14px;
}

.about-content {
    display: grid;
    gap: 20px;
}

.about-item {
    padding: 26px;
    background: rgba(255, 255, 255, 0.04);
}

.about-item h2 {
    margin-bottom: 14px;
    color: #ffffff;
    font-size: 1.22rem;
}

.feature-list,
.contact-list {
    list-style: none;
    display: grid;
    gap: 12px;
}

.feature-list li,
.contact-list li {
    color: var(--text-muted);
}

[data-reveal] {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 46px;
    height: 46px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(8, 17, 31, 0.84);
    color: #ffffff;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-2px);
}

@media (max-width: 1100px) {
    .hero-container,
    .split-layout {
        grid-template-columns: 1fr;
    }

    .hero-content {
        max-width: none;
    }

    .device-showcase {
        margin: 0 auto;
        width: min(100%, 260px);
    }

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

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

    .download-actions,
    .status-grid,
    .faq-list,
    .footer-content {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .trust-strip {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        display: grid;
        gap: 8px;
        padding: 18px 20px 24px;
        background: rgba(7, 17, 31, 0.96);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
        transform: translateY(-12px);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: transform 0.22s ease, opacity 0.22s ease, visibility 0.22s ease;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    .hamburger {
        display: inline-block;
    }

    .nav-link {
        width: 100%;
        padding: 10px 4px;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .hero {
        padding-top: calc(var(--nav-height) + 18px);
    }

    .hero-container {
        gap: 18px;
    }

    .hero-title {
        font-size: clamp(2rem, 11vw, 3rem);
    }

    .hero-description,
    .section-description {
        font-size: 0.92rem;
    }

    .hero-meta,
    .feature-grid,
    .screenshots-grid,
    .download-actions,
    .status-grid,
    .faq-list,
    .footer-content {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 84px 0;
    }

    .container,
    .nav-container,
    .hero-container {
        width: min(100% - 28px, 1180px);
    }

    .feature-card,
    .status-card,
    .faq-item,
    .about-item,
    .store-card {
        padding: 22px;
    }
}