:root {
    --bg-primary: #0b0f1c;
    --bg-secondary: #12182a;
    --bg-tertiary: #19223a;
    --accent: #22d3ee;
    --accent-strong: #14b8a6;
    --accent-glow: rgba(34, 211, 238, 0.3);
    --accent-light: #5eead4;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5f5;
    --text-muted: #8a94b8;
    --border: rgba(148, 163, 184, 0.18);
    --surface: rgba(255, 255, 255, 0.04);
    --gradient: linear-gradient(135deg, #22d3ee 0%, #14b8a6 55%, #f59e0b 110%);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "DM Sans", sans-serif;
    background-color: var(--bg-primary);
    background-image:
        radial-gradient(1200px 600px at 70% -10%, rgba(34, 211, 238, 0.16), transparent 60%),
        radial-gradient(900px 500px at 10% 10%, rgba(245, 158, 11, 0.12), transparent 55%),
        radial-gradient(1000px 800px at 50% 120%, rgba(20, 184, 166, 0.18), transparent 60%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: repeating-linear-gradient(
        115deg,
        rgba(255, 255, 255, 0.03) 0px,
        rgba(255, 255, 255, 0.03) 1px,
        transparent 1px,
        transparent 12px
    );
    opacity: 0.4;
    mix-blend-mode: soft-light;
    z-index: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: "Sora", sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.nav.scrolled {
    background: rgba(11, 15, 28, 0.85);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}

.nav.menu-open {
    background: rgba(11, 15, 28, 0.94);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 24px;
}

.logo {
    font-family: "Sora", sans-serif;
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 2px;
}

.logo-dot {
    width: 8px;
    height: 8px;
    background: var(--gradient);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--accent-glow);
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    list-style: none;
    justify-self: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 12px;
    font-family: "DM Sans", sans-serif;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient);
    color: var(--text-primary);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 35px var(--accent-glow);
}

.btn-secondary {
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: rgba(30, 41, 59, 0.6);
    border-color: var(--accent-strong);
}

.btn-topup {
    gap: 10px;
    background: linear-gradient(135deg, #f59e0b 0%, #fb7185 45%, #22d3ee 100%);
    color: #fff;
    box-shadow: 0 10px 30px rgba(245, 158, 11, 0.22);
}

.btn-topup:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 18px 40px rgba(245, 158, 11, 0.3);
}

.btn-nav-plan,
.btn-nav-topup {
    min-width: 160px;
    padding: 14px 22px;
}

.nav-cta-left {
    justify-self: start;
}

.nav-cta-right {
    justify-self: end;
}

.btn-wechat {
    gap: 10px;
    background: linear-gradient(135deg, #22c55e 0%, #14b8a6 100%);
    color: #fff;
    box-shadow: 0 10px 26px rgba(34, 197, 94, 0.2);
}

.btn-wechat:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 18px 38px rgba(34, 197, 94, 0.28);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 999;
    left: 0;
    right: 0;
    background: rgba(11, 15, 28, 0.97);
    backdrop-filter: blur(24px);
    padding: 108px 24px 32px;
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateY(-16px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

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

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.mobile-nav-links > li {
    border-bottom: 1px solid var(--border);
}

.mobile-nav-links > li:last-child {
    border-bottom: none;
    padding-top: 24px;
}

.mobile-nav-links > li > a:not(.mobile-nav-cta) {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 22px;
    display: block;
    padding: 20px 0;
}

.mobile-nav-cta {
    width: 100%;
    margin-top: 0;
    padding: 18px 22px;
    border-radius: 20px;
    border: none;
}

.mobile-nav-cta-group {
    margin-top: 0;
    display: grid;
    gap: 14px;
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0;
    overflow: hidden;
    z-index: 1;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-orb {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(34, 211, 238, 0.25) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: pulse 8s ease-in-out infinite;
    filter: blur(2px);
}

.hero-orb-2 {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(16, 163, 127, 0.15) 0%, transparent 70%);
    top: 30%;
    left: 20%;
    animation: float 10s ease-in-out infinite;
}

.hero-orb-3 {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(16, 163, 127, 0.1) 0%, transparent 70%);
    bottom: 20%;
    right: 15%;
    animation: float 12s ease-in-out infinite reverse;
}

@keyframes pulse {
    0%,
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.8;
    }

    50% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 1;
    }
}

@keyframes float {
    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-30px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.3;
    }
}

.hero h1 {
    font-size: 64px;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-light) 60%, #f59e0b 120%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.hero-model {
    white-space: nowrap;
}

.hero-heading-secondary {
    display: inline-block;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-topup-strip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-top: 24px;
    padding: 14px 18px;
    border-radius: 18px;
    border: 1px solid rgba(245, 158, 11, 0.35);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.16), rgba(34, 211, 238, 0.12));
    box-shadow: 0 18px 40px rgba(8, 12, 24, 0.35);
    color: var(--text-primary);
    text-decoration: none;
    flex-wrap: wrap;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.hero-topup-strip:hover {
    transform: translateY(-4px);
    border-color: rgba(245, 158, 11, 0.6);
    box-shadow: 0 24px 48px rgba(8, 12, 24, 0.45);
}

.hero-topup-pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.52);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fbbf24;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero-topup-copy {
    font-size: 16px;
    color: var(--text-secondary);
}

.hero-topup-copy strong {
    color: var(--text-primary);
    font-family: "Sora", sans-serif;
    font-size: 18px;
}

.hero-topup-action {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    font-weight: 700;
}

.chat-bubbles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.chat-bubble {
    position: absolute;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

.chat-bubble-1 {
    top: 20%;
    left: 5%;
    animation-delay: 0s;
}

.chat-bubble-2 {
    top: 60%;
    right: 5%;
    animation-delay: 2s;
}

.chat-bubble-3 {
    bottom: 15%;
    left: 10%;
    animation-delay: 4s;
}

/* Shared section styles */
.topup,
.features,
.how-it-works,
.pricing {
    padding: 120px 0;
    position: relative;
    z-index: 1;
}

.benefits,
.testimonials,
.faq {
    padding: 120px 0;
    position: relative;
    z-index: 1;
}

.benefits {
    background: linear-gradient(180deg, rgba(18, 24, 42, 0.9), rgba(11, 15, 28, 0.6));
}

.testimonials {
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.9), rgba(11, 15, 28, 0.8));
}

.faq {
    background: linear-gradient(180deg, rgba(18, 24, 42, 0.95), rgba(11, 15, 28, 0.85));
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    color: var(--accent);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Top Up Entry */
.topup {
    padding-top: 72px;
    scroll-margin-top: 120px;
}

.pricing {
    padding: 84px 0 76px;
    scroll-margin-top: 52px;
}

.pricing .section-header {
    margin-bottom: 44px;
}

.pricing .section-subtitle {
    max-width: 720px;
}

.topup-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    gap: 32px;
    align-items: stretch;
}

.topup-featured,
.topup-panel {
    position: relative;
    overflow: hidden;
    border-radius: 28px;
    border: 1px solid var(--border);
    box-shadow: 0 24px 60px rgba(8, 12, 24, 0.42);
}

.topup-featured {
    padding: 40px;
    background:
        radial-gradient(320px 160px at 80% 10%, rgba(245, 158, 11, 0.16), transparent 60%),
        radial-gradient(280px 160px at 0% 100%, rgba(34, 211, 238, 0.14), transparent 60%),
        linear-gradient(145deg, rgba(17, 24, 39, 0.96), rgba(11, 15, 28, 0.92));
}

.topup-panel {
    padding: 32px;
    background: linear-gradient(160deg, rgba(15, 23, 42, 0.88), rgba(11, 15, 28, 0.92));
}

.topup-kicker,
.topup-panel-label {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 999px;
    margin-bottom: 18px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.topup-kicker {
    background: rgba(245, 158, 11, 0.14);
    border: 1px solid rgba(245, 158, 11, 0.25);
    color: #fbbf24;
}

.topup-panel-label {
    background: rgba(34, 211, 238, 0.12);
    border: 1px solid rgba(34, 211, 238, 0.2);
    color: var(--accent);
}

.topup-title {
    font-size: 48px;
    line-height: 1.08;
    margin-bottom: 18px;
}

.topup-title span {
    background: linear-gradient(135deg, #fbbf24 0%, #fb7185 52%, #22d3ee 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.topup-subtitle {
    max-width: 680px;
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.topup-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 28px;
}

.topup-badge {
    display: inline-flex;
    align-items: center;
    padding: 10px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.topup-price-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.topup-price-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.topup-price-label {
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.topup-price {
    font-family: "Sora", sans-serif;
    font-size: 68px;
    line-height: 0.95;
    font-weight: 800;
    color: var(--text-primary);
}

.topup-price span {
    margin-left: 6px;
    font-size: 22px;
    color: var(--text-secondary);
    font-weight: 500;
}

.topup-main-cta {
    min-width: 220px;
}

.topup-action-group {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 14px;
}

.topup-wechat-btn {
    min-width: 220px;
}

.topup-note {
    margin-top: 16px;
    color: var(--text-muted);
    font-size: 14px;
}

.topup-note code {
    font-family: "DM Sans", sans-serif;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 8px;
    border-radius: 999px;
}

.topup-panel h3 {
    font-size: 28px;
    line-height: 1.2;
    margin-bottom: 18px;
}

.topup-panel-list {
    list-style: none;
    display: grid;
    gap: 14px;
    margin-bottom: 24px;
}

.topup-panel-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

.topup-panel-list li span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    border-radius: 12px;
    background: rgba(245, 158, 11, 0.14);
    border: 1px solid rgba(245, 158, 11, 0.24);
    color: #fbbf24;
    font-size: 12px;
    font-weight: 800;
    font-family: "Sora", sans-serif;
}

.topup-link-card {
    display: block;
    width: 100%;
    padding: 18px;
    border-radius: 22px;
    text-decoration: none;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.18), rgba(34, 211, 238, 0.16));
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    text-align: left;
    cursor: pointer;
    font: inherit;
}

.topup-link-card:hover {
    transform: translateY(-4px);
    border-color: rgba(245, 158, 11, 0.4);
    box-shadow: 0 18px 34px rgba(8, 12, 24, 0.32);
}

.topup-qrcode-card {
    text-align: center;
    cursor: default;
    max-width: 232px;
    margin: 0 auto;
}

.topup-qrcode-card:hover {
    transform: none;
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 18px 34px rgba(8, 12, 24, 0.32);
}

.topup-link-card-label {
    display: block;
    margin-bottom: 8px;
    color: rgba(248, 250, 252, 0.72);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.topup-link-card strong {
    display: block;
    font-family: "Sora", sans-serif;
    font-size: 16px;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.topup-qrcode-frame {
    width: min(100%, 118px);
    margin: 8px auto 0;
    padding: 5px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 18px 36px rgba(8, 12, 24, 0.28);
}

.topup-qrcode-frame img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 16px;
}

.topup-qrcode-note {
    display: block;
    margin-top: 8px;
    color: #fbbf24;
    font-weight: 700;
    font-size: 10px;
}

.topup-link-card-arrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #fbbf24;
    font-weight: 700;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: linear-gradient(160deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.9));
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(400px 200px at 20% 0%, rgba(34, 211, 238, 0.08), transparent 60%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(8, 12, 24, 0.45);
    border-color: rgba(34, 211, 238, 0.5);
}

.feature-card:hover::before,
.feature-card:hover::after {
    opacity: 1;
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(34, 211, 238, 0.12);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--accent);
    box-shadow: 0 10px 25px rgba(34, 211, 238, 0.15);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 16px;
}

/* Benefits */
.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.benefits-text h2 {
    font-size: 48px;
    margin-bottom: 24px;
}

.benefits-text p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 32px;
}

.benefits-list {
    list-style: none;
}

.benefits-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    color: var(--text-secondary);
    font-size: 16px;
}

.benefits-list li svg {
    color: var(--accent);
    flex-shrink: 0;
}

.benefits-visual {
    position: relative;
}

.benefits-card {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 25px 60px rgba(8, 12, 24, 0.5);
}

.benefits-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.benefits-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.benefits-card-title {
    font-size: 16px;
    margin-bottom: 4px;
}

.benefits-card-subtitle {
    font-size: 14px;
    color: var(--text-muted);
}

.benefits-chat {
    background: rgba(30, 41, 59, 0.65);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    border: 1px solid rgba(148, 163, 184, 0.12);
}

.benefits-chat p {
    color: var(--text-secondary);
    font-size: 14px;
}

.benefits-chat.user {
    background: rgba(34, 211, 238, 0.12);
    border: 1px solid rgba(34, 211, 238, 0.28);
}

.benefits-chat-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

/* How it works */
.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
}

.steps::before {
    content: "";
    position: absolute;
    top: 40px;
    left: 15%;
    right: 15%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    opacity: 0.3;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 80px;
    height: 80px;
    background: var(--gradient);
    border: 2px solid var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-family: "Sora", sans-serif;
    font-size: 28px;
    font-weight: 700;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: 1;
    box-shadow: 0 12px 30px rgba(34, 211, 238, 0.2);
}

.step-icon {
    width: 64px;
    height: 64px;
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(34, 211, 238, 0.35);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: var(--accent);
}

.step h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.step p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 280px;
    margin: 0 auto;
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    background: rgba(15, 23, 42, 0.75);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-6px);
    border-color: rgba(34, 211, 238, 0.5);
    box-shadow: 0 18px 40px rgba(8, 12, 24, 0.45);
}

.testimonial-stars {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
}

.testimonial-stars svg {
    color: #fbbf24;
    width: 20px;
    height: 20px;
}

.testimonial-text {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
}

.testimonial-name {
    font-weight: 600;
    font-size: 16px;
}

.testimonial-role {
    font-size: 14px;
    color: var(--text-muted);
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
    align-items: stretch;
}

.pricing-grid--wide {
    grid-template-columns: repeat(4, 1fr);
    max-width: none;
    gap: 20px;
}

.pricing-card {
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 24px 20px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    box-shadow: 0 16px 40px rgba(8, 12, 24, 0.45);
    display: flex;
    flex-direction: column;
}

.pricing-card.featured {
    border-color: rgba(245, 158, 11, 0.7);
    transform: scale(1.02);
    box-shadow: 0 24px 60px rgba(245, 158, 11, 0.15);
}

.pricing-card.featured::before {
    content: "最划算";
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #000;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: rgba(34, 211, 238, 0.6);
    box-shadow: 0 22px 50px rgba(8, 12, 24, 0.55);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
    box-shadow: 0 20px 40px rgba(251, 191, 36, 0.25);
}

.pricing-name {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
}

.pricing-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.pricing-desc-highlight {
    color: var(--accent);
    font-weight: 600;
}

.pricing-desc-featured {
    color: #fbbf24;
    font-weight: 700;
    font-size: 15px;
}

.pricing-price {
    font-size: 36px;
    font-weight: 700;
    font-family: "Sora", sans-serif;
    margin-bottom: 6px;
    white-space: nowrap;
}

.pricing-price span {
    font-size: 13px;
    font-weight: 400;
    color: var(--text-muted);
    white-space: nowrap;
}

.pricing-period {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.pricing-period-featured {
    color: #fbbf24;
    font-weight: 600;
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 20px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 7px 0;
    font-size: 15px;
    color: var(--text-secondary);
}

.pricing-features li svg {
    color: var(--accent);
    flex-shrink: 0;
}

.pricing-btn {
    width: 100%;
    margin-top: auto;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid var(--border);
    border-radius: 16px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: rgba(34, 211, 238, 0.55);
}

.faq-item.active {
    border-color: rgba(34, 211, 238, 0.6);
    box-shadow: 0 10px 30px rgba(8, 12, 24, 0.45);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    color: var(--text-primary);
    font-family: "DM Sans", sans-serif;
    font-size: 18px;
    font-weight: 600;
    text-align: left;
}

.faq-icon {
    width: 24px;
    height: 24px;
    color: var(--accent);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-inner {
    padding: 0 24px 24px;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* Footer */
.footer {
    padding: 60px 0 40px;
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo {
    font-family: "Sora", sans-serif;
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 2px;
}

.footer-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

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

.footer-copyright {
    width: 100%;
    text-align: center;
    padding-top: 40px;
    margin-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 14px;
}

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Modal */
.wechat-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
}

.wechat-modal.active {
    display: block;
}

.wechat-modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    cursor: pointer;
}

.wechat-modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(160deg, rgba(15, 23, 42, 0.98) 0%, rgba(17, 24, 39, 0.92) 100%);
    border-radius: 18px;
    padding: 24px 28px 22px;
    text-align: center;
    max-width: 380px;
    width: 90%;
    border: 1px solid rgba(34, 211, 238, 0.35);
    box-shadow: 0 25px 50px rgba(8, 12, 24, 0.6);
}

.wechat-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 22px;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s;
}

.wechat-modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.wechat-modal-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 12px;
    background: linear-gradient(135deg, #22d3ee 0%, #14b8a6 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wechat-modal-icon svg {
    color: #fff;
    width: 30px;
    height: 30px;
}

.wechat-modal-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
}

.wechat-modal-desc {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.5;
    white-space: normal;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
}

.wechat-qrcode {
    background: #f0f0f0;
    padding: 4px;
    border-radius: 10px;
    margin-bottom: 10px;
    display: inline-block;
}

.wechat-qrcode img {
    width: 132px;
    height: 132px;
    display: block;
    margin: 0 auto;
}

.wechat-modal-note {
    font-size: 12px;
    color: #4ade80;
    font-weight: 600;
    line-height: 1.4;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

.wechat-modal.active .wechat-modal-content {
    animation: modalIn 0.3s ease;
}

@keyframes modalOut {
    from {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    to {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }
}

.wechat-modal.closing .wechat-modal-content {
    animation: modalOut 0.2s ease forwards;
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .topup-shell {
        grid-template-columns: 1fr;
    }

    .steps {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

    .benefits-content {
        gap: 40px;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
}

@media (max-width: 768px) {
    body.mobile-menu-open {
        overflow: hidden;
    }

    .nav {
        padding: 18px 0;
    }

    .nav-inner {
        display: flex;
        justify-content: flex-end;
        align-items: center;
    }

    .nav-links,
    .nav .btn {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
        position: relative;
        z-index: 1001;
    }

    .mobile-nav {
        display: block;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-badge {
        margin-bottom: 24px;
        padding: 8px 14px;
    }

    .hero h1 {
        font-size: 36px;
        line-height: 1.08;
        margin-bottom: 20px;
    }

    .hero h1 br {
        display: none;
    }

    .hero-subtitle {
        font-size: 17px;
        line-height: 1.7;
        margin-bottom: 32px;
    }

    .hero-buttons {
        width: min(100%, 360px);
        margin: 0 auto;
        flex-direction: column;
        align-items: stretch;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .section-title {
        font-size: 32px;
    }

    .features,
    .topup,
    .benefits,
    .how-it-works,
    .testimonials,
    .pricing,
    .faq {
        padding: 80px 0;
    }

    .topup {
        scroll-margin-top: 96px;
    }

    .features-grid,
    .steps,
    .testimonials-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        max-width: 400px;
    }

    .benefits-content {
        grid-template-columns: 1fr;
    }

    .benefits-visual {
        order: -1;
    }

    .steps::before {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 112px 0 80px;
    }

    .hero-topup-strip {
        align-items: flex-start;
        justify-content: flex-start;
        text-align: left;
        width: min(100%, 420px);
        margin-left: auto;
        margin-right: auto;
        padding: 16px;
    }

    .topup-title {
        font-size: 38px;
    }

    .topup-price {
        font-size: 52px;
    }

    .topup-price-row {
        align-items: flex-start;
    }

    .topup-action-group {
        width: 100%;
        justify-content: flex-start;
    }

    .topup-featured,
    .topup-panel {
        padding: 28px;
    }

    .chat-bubbles {
        display: none;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 20px;
    }

    .mobile-nav {
        padding: 96px 20px 28px;
    }

    .mobile-nav-links > li > a:not(.mobile-nav-cta) {
        font-size: 20px;
        padding: 18px 0;
    }

    .hero-badge {
        font-size: 13px;
    }

    .hero h1 {
        font-size: 30px;
    }

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