:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(35,91,165);
    --primary-soft: rgb(232,243,255);
    --ink: #12233d;
    --muted: #5d6b82;
    --line: #dce8f8;
    --bg: #f7fbff;
    --white: #ffffff;
    --shadow: 0 18px 45px rgba(39, 93, 160, 0.10);
    --radius: 22px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f2f8ff 0%, #ffffff 46%, #f7fbff 100%);
    line-height: 1.72;
    overflow-x: hidden;
}

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

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

p {
    margin: 0 0 16px;
    color: var(--muted);
}

h1,
h2,
h3 {
    margin: 0 0 14px;
    line-height: 1.22;
    color: var(--ink);
    font-weight: 800;
}

h1 {
    font-size: clamp(34px, 9vw, 64px);
    letter-spacing: -1.6px;
}

h2 {
    font-size: clamp(26px, 5.8vw, 42px);
    letter-spacing: -0.8px;
}

h3 {
    font-size: 20px;
}

ul,
ol {
    margin: 0;
    padding-left: 22px;
    color: var(--muted);
}

li + li {
    margin-top: 10px;
}

.container {
    width: min(100% - 32px, 1160px);
    margin: 0 auto;
}

.narrow {
    max-width: 850px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220, 232, 248, 0.85);
}

.header-inner {
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand,
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 900;
    color: var(--ink);
    letter-spacing: -0.4px;
}

.logo-img,
.footer-logo {
    width: 38px;
    height: 38px;
    border-radius: 13px;
    object-fit: cover;
    box-shadow: 0 10px 24px rgba(70, 139, 223, 0.18);
}

.brand-text {
    font-size: 20px;
}

.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    background: var(--white);
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 20px;
    height: 2px;
    border-radius: 2px;
    background: var(--ink);
}

.main-nav {
    position: absolute;
    top: 70px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: var(--white);
    box-shadow: var(--shadow);
}

.main-nav.open {
    display: flex;
}

.main-nav a {
    padding: 12px 14px;
    border-radius: 14px;
    font-size: 15px;
    color: #33445f;
    transition: background 0.2s ease, color 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--primary-soft);
    color: var(--primary-dark);
}

.hero {
    padding: 54px 0 46px;
    background:
        radial-gradient(circle at 85% 12%, rgba(70,139,223,0.18), transparent 30%),
        linear-gradient(135deg, #eff7ff 0%, #ffffff 52%, #eaf4ff 100%);
}

.hero-grid {
    display: grid;
    gap: 38px;
    align-items: center;
}

.eyebrow,
.section-kicker {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    margin-bottom: 16px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,0.22);
    border-radius: 999px;
    background: rgba(255,255,255,0.74);
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 13px;
}

.hero-text {
    font-size: 17px;
    max-width: 650px;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin: 26px 0 22px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    font-size: 16px;
    box-shadow: 0 14px 28px rgba(70,139,223,0.26);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    white-space: nowrap;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 18px 34px rgba(70,139,223,0.30);
}

.hero-note {
    color: var(--muted);
    font-size: 14px;
}

.trust-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.trust-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(70,139,223,0.10);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    min-height: 430px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.phone-card {
    width: min(330px, 86vw);
    border-radius: 36px;
    padding: 14px;
    background: linear-gradient(180deg, #ffffff, #eaf4ff);
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: 0 28px 70px rgba(31, 89, 154, 0.18);
}

.phone-card img {
    width: 100%;
    border-radius: 28px;
}

.visual-badge {
    position: absolute;
    padding: 10px 14px;
    border-radius: 16px;
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--line);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 800;
    box-shadow: var(--shadow);
}

.badge-one {
    left: 0;
    top: 58px;
}

.badge-two {
    right: 0;
    bottom: 66px;
}

.section {
    padding: 58px 0;
}

.soft-section {
    background: rgba(232,243,255,0.64);
}

.section-heading {
    max-width: 760px;
    margin: 0 auto 30px;
    text-align: center;
}

.two-col,
.content-layout {
    display: grid;
    gap: 26px;
    align-items: start;
}

.card,
.info-card,
.security-panel,
.cta-card,
.faq-item,
.scenario,
.steps-panel,
.warning-card {
    border: 1px solid rgba(220,232,248,0.95);
    border-radius: var(--radius);
    background: var(--white);
    box-shadow: var(--shadow);
}

.card,
.info-card,
.security-panel,
.faq-item,
.scenario,
.steps-panel,
.warning-card {
    padding: 22px;
}

.stats-card {
    display: grid;
    gap: 14px;
}

.stat-row {
    display: grid;
    gap: 4px;
    padding: 16px;
    border-radius: 18px;
    background: var(--primary-soft);
}

.stat-row strong {
    color: var(--primary-dark);
    font-size: 28px;
    line-height: 1;
}

.stat-row span {
    color: var(--muted);
}

.feature-grid,
.scenario-grid {
    display: grid;
    gap: 18px;
}

.card h3,
.scenario h3,
.faq-item h3 {
    color: #17355f;
}

.card p,
.scenario p,
.faq-item p {
    margin-bottom: 0;
}

.security-panel {
    background: linear-gradient(135deg, #ffffff 0%, #eef7ff 100%);
}

.check-list h3,
.side-card h3,
.side-card h2 {
    color: var(--primary-dark);
}

.scenario span {
    display: inline-flex;
    width: 42px;
    height: 42px;
    margin-bottom: 14px;
    border-radius: 14px;
    align-items: center;
    justify-content: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.faq-list {
    display: grid;
    gap: 16px;
}

.faq-list.compact {
    gap: 12px;
}

.faq-item h2 {
    font-size: 21px;
}

.faq-item h3 {
    font-size: 18px;
}

.cta-card {
    padding: 28px;
    display: grid;
    gap: 18px;
    align-items: center;
    background:
        radial-gradient(circle at 96% 5%, rgba(70,139,223,0.22), transparent 28%),
        linear-gradient(135deg, #ffffff 0%, #edf7ff 100%);
}

.page-hero {
    padding: 56px 0 42px;
    background:
        radial-gradient(circle at 82% 14%, rgba(70,139,223,0.16), transparent 30%),
        linear-gradient(135deg, #f1f8ff 0%, #ffffff 100%);
    border-bottom: 1px solid rgba(220,232,248,0.8);
}

.page-hero p {
    font-size: 17px;
}

.page-hero .download-btn {
    margin-top: 8px;
}

.content-main {
    min-width: 0;
}

.content-main h2 {
    margin-top: 28px;
    font-size: clamp(24px, 4.8vw, 34px);
}

.content-main h2:first-child {
    margin-top: 0;
}

.side-card {
    position: relative;
}

.notice-card {
    background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
}

.step-list {
    padding-left: 0;
    list-style: none;
    display: grid;
    gap: 14px;
}

.step-list li {
    display: grid;
    gap: 6px;
    padding: 16px;
    margin: 0;
    border-radius: 18px;
    background: var(--primary-soft);
}

.step-list strong {
    color: var(--primary-dark);
}

.step-list span {
    color: var(--muted);
}

.warning-card {
    background: linear-gradient(135deg, #ffffff 0%, #f5faff 100%);
}

.site-footer {
    padding: 42px 0 24px;
    background: #10243d;
    color: #dce9fb;
}

.site-footer p,
.site-footer a,
.footer-bottom {
    color: #bed0e7;
}

.footer-grid {
    display: grid;
    gap: 28px;
}

.footer-grid h3 {
    margin-bottom: 12px;
    color: #ffffff;
    font-size: 17px;
}

.footer-grid a {
    display: block;
    margin-bottom: 10px;
    transition: color 0.2s ease;
}

.footer-grid a:hover {
    color: #ffffff;
}

.footer-brand {
    color: #ffffff;
    margin-bottom: 14px;
}

.footer-bottom {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.12);
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
}

@media (min-width: 640px) {
    .container {
        width: min(100% - 48px, 1160px);
    }

    .hero-actions,
    .cta-card {
        grid-template-columns: 1fr auto;
    }

    .hero-actions {
        flex-direction: row;
        align-items: center;
    }

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

    .footer-grid {
        grid-template-columns: 1.4fr repeat(3, 1fr);
    }
}

@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }

    .main-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }

    .main-nav a {
        padding: 9px 12px;
    }

    .hero {
        padding: 74px 0 70px;
    }

    .hero-grid {
        grid-template-columns: 1.06fr 0.94fr;
        gap: 54px;
    }

    .two-col {
        grid-template-columns: 1fr 0.92fr;
        gap: 34px;
    }

    .content-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        gap: 36px;
    }

    .reverse-on-mobile {
        grid-template-columns: 1.05fr 0.95fr;
    }

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

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

    .section {
        padding: 76px 0;
    }

    .page-hero {
        padding: 76px 0 58px;
    }

    .card,
    .info-card,
    .security-panel,
    .faq-item,
    .scenario,
    .steps-panel,
    .warning-card {
        padding: 28px;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (min-width: 1120px) {
    .main-nav a {
        padding: 10px 15px;
    }

    .phone-card {
        width: 372px;
    }
}

@media (max-width: 380px) {
    .container {
        width: min(100% - 24px, 1160px);
    }

    .brand-text {
        font-size: 18px;
    }

    .download-btn {
        width: 100%;
    }

    .hero-note {
        display: block;
    }
}