/* Fulcrum 宣传页样式 — 主题色取自 App 内 AppTheme (#00E5FF / #051224 / #0A2342) */
:root {
    --cyan: #00e5ff;
    --cyan-soft: #5fb8c9;
    --navy: #051224;
    --deep: #0a2342;
    --card: rgba(255, 255, 255, 0.045);
    --card-border: rgba(255, 255, 255, 0.1);
    --text: #eaf4fa;
    --muted: #9db4c4;
    --radius: 20px;
    --max: 1120px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.65;
    color: var(--text);
    background: var(--navy);
    background-image:
        radial-gradient(900px 500px at 85% -5%, rgba(0, 229, 255, 0.16), transparent 60%),
        radial-gradient(700px 500px at -10% 30%, rgba(10, 35, 66, 0.9), transparent 70%);
    background-repeat: no-repeat;
}

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

a {
    color: var(--cyan);
    text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--cyan);
    outline-offset: 3px;
    border-radius: 8px;
}

.container {
    width: min(100% - 40px, var(--max));
    margin-inline: auto;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 8px;
    background: var(--cyan);
    color: var(--navy);
    padding: 8px 14px;
    border-radius: 8px;
    z-index: 100;
}

.skip-link:focus {
    left: 8px;
}

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(5, 18, 36, 0.78);
    backdrop-filter: saturate(160%) blur(14px);
    -webkit-backdrop-filter: saturate(160%) blur(14px);
    border-bottom: 1px solid var(--card-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 64px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    font-size: 18px;
    text-decoration: none;
}

.brand img {
    width: 34px;
    height: 34px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 22px;
}

.nav-links a {
    color: var(--muted);
    text-decoration: none;
    font-size: 15px;
}

.nav-links a:hover {
    color: var(--text);
}

.lang-switch {
    border: 1px solid var(--card-border);
    border-radius: 999px;
    padding: 4px 12px;
}

.btn-small {
    background: var(--cyan);
    color: var(--navy) !important;
    font-weight: 700;
    padding: 7px 16px;
    border-radius: 999px;
}

@media (max-width: 760px) {
    .nav-links .hide-sm {
        display: none;
    }
}

/* ---------- Hero ---------- */
.hero {
    padding: 72px 0 56px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    align-items: center;
    gap: 40px;
}

.eyebrow {
    display: inline-block;
    color: var(--cyan);
    background: rgba(0, 229, 255, 0.1);
    border: 1px solid rgba(0, 229, 255, 0.3);
    border-radius: 999px;
    padding: 4px 14px;
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 20px;
}

h1 {
    font-size: clamp(34px, 5.2vw, 58px);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin: 0 0 20px;
}

h1 .accent {
    background: linear-gradient(90deg, var(--cyan), #7df3ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.lead {
    font-size: clamp(17px, 2vw, 20px);
    color: var(--muted);
    margin: 0 0 30px;
    max-width: 34em;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 18px;
}

.badge-link {
    display: inline-block;
    line-height: 0;
    transition: transform 0.2s ease;
}

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

.badge-link img {
    height: 54px;
    width: auto;
}

.meta-line {
    color: var(--muted);
    font-size: 14px;
    margin-top: 16px;
}

/* 三张截图扇形排列 */
.phones {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
}

.hero-grid > * {
    min-width: 0;
}

.phone {
    border-radius: 22px;
    border: 1px solid var(--card-border);
    box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.7), 0 0 60px -10px rgba(0, 229, 255, 0.25);
    width: min(26vw, 168px);
    background: #0b1c33;
}

.phone.center {
    width: min(34vw, 214px);
    z-index: 2;
}

.phone.left {
    transform: rotate(-6deg) translateY(18px);
    margin-right: -36px;
}

.phone.right {
    transform: rotate(6deg) translateY(18px);
    margin-left: -36px;
}

@media (max-width: 860px) {
    .hero {
        padding-top: 44px;
    }
    .hero-grid {
        grid-template-columns: 1fr;
    }
    .phones {
        order: 2;
    }
}

/* ---------- Sections ---------- */
section {
    padding: 64px 0;
}

.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 44px;
}

h2 {
    font-size: clamp(28px, 3.8vw, 40px);
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin: 0 0 14px;
}

.section-head p {
    color: var(--muted);
    font-size: 18px;
    margin: 0;
}

h3 {
    font-size: 20px;
    margin: 0 0 8px;
}

.grid {
    display: grid;
    gap: 20px;
}

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

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

@media (max-width: 860px) {
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: var(--radius);
    padding: 28px;
}

.card p {
    color: var(--muted);
    margin: 0;
}

.step-num {
    display: inline-grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(0, 229, 255, 0.12);
    border: 1px solid rgba(0, 229, 255, 0.4);
    color: var(--cyan);
    font-weight: 800;
    margin-bottom: 16px;
}

.feature-icon {
    font-size: 28px;
    margin-bottom: 12px;
    line-height: 1;
}

.statement {
    background: linear-gradient(135deg, rgba(10, 35, 66, 0.9), rgba(5, 18, 36, 0.4));
    border: 1px solid var(--card-border);
    border-radius: 28px;
    padding: clamp(28px, 5vw, 56px);
    text-align: center;
}

.statement p {
    font-size: clamp(18px, 2.4vw, 24px);
    max-width: 780px;
    margin: 0 auto;
    color: var(--text);
}

.statement p + p {
    margin-top: 16px;
    color: var(--muted);
    font-size: clamp(16px, 2vw, 19px);
}

/* ---------- FAQ ---------- */
.faq {
    max-width: 780px;
    margin: 0 auto;
}

details {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 0 22px;
    margin-bottom: 12px;
}

summary {
    cursor: pointer;
    list-style: none;
    font-weight: 600;
    font-size: 18px;
    padding: 18px 0;
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: "+";
    color: var(--cyan);
    font-size: 24px;
    line-height: 1;
}

details[open] summary::after {
    content: "–";
}

details p {
    margin: 0 0 18px;
    color: var(--muted);
}

/* ---------- Final CTA ---------- */
.final-cta {
    text-align: center;
}

.final-cta .cta-row {
    justify-content: center;
}

.final-cta .box {
    background: linear-gradient(135deg, rgba(0, 229, 255, 0.14), rgba(10, 35, 66, 0.6));
    border: 1px solid rgba(0, 229, 255, 0.3);
    border-radius: 28px;
    padding: clamp(36px, 6vw, 64px) 24px;
}

.final-cta .app-icon {
    width: 96px;
    height: 96px;
    border-radius: 22px;
    margin: 0 auto 20px;
    box-shadow: 0 0 50px rgba(0, 229, 255, 0.35);
}

.final-cta p {
    color: var(--muted);
    font-size: 18px;
    margin: 0 auto 28px;
    max-width: 560px;
}

/* ---------- Footer ---------- */
.site-footer {
    border-top: 1px solid var(--card-border);
    padding: 36px 0 48px;
    color: var(--muted);
    font-size: 14px;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

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

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

.disclaimer {
    margin-top: 16px;
    font-size: 12px;
    opacity: 0.75;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .badge-link {
        transition: none;
    }
}