:root {
    --sf-bg: #050709;
    --sf-panel: rgba(255, 255, 255, 0.075);
    --sf-panel-strong: rgba(255, 255, 255, 0.12);
    --sf-text: #ffffff;
    --sf-muted: #b8bec8;
    --sf-line: rgba(255, 255, 255, 0.14);
    --sf-green: #c7ff2e;
    --sf-cyan: #04f2c7;
    --sf-blue: #167bff;
    --sf-orange: rgb(253, 132, 46);
    --sf-radius-lg: 28px;
    --sf-radius-md: 18px;
}

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

html {
    scroll-behavior: smooth;
}

body.skippingfit-page {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--sf-text);
    background:
        radial-gradient(circle at 12% 10%, rgba(4, 242, 199, 0.22), transparent 32%),
        radial-gradient(circle at 88% 18%, rgba(199, 255, 46, 0.12), transparent 30%),
        linear-gradient(180deg, #050709 0%, #071012 52%, #020304 100%);
}

a {
    color: var(--sf-cyan);
    text-decoration: none;
}

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

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

body.skippingfit-page #header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    width: 100%;
    background: rgba(45, 44, 44, 0.86);
    backdrop-filter: blur(18px);
    box-shadow: 0 8px 34px rgba(0, 0, 0, 0.2);
}

#header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 74px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    width: 30px;
    height: 30px;
    border-radius: 8px;
}

.logo a {
    color: #fff;
    font-size: 1.06rem;
    font-weight: 700;
}

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

.nav-links a {
    color: rgba(255, 255, 255, 0.86);
    font-weight: 600;
}

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

.mobile-menu {
    display: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
}

body.skippingfit-page .product-hero {
    position: relative;
    overflow: hidden;
    padding: 146px 0 92px;
}

.product-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(115deg, rgba(253, 132, 46, 0.12), transparent 34%),
        radial-gradient(circle at 58% 42%, rgba(199, 255, 46, 0.14), transparent 28%),
        radial-gradient(circle at 76% 68%, rgba(4, 242, 199, 0.12), transparent 34%);
    pointer-events: none;
}

.product-hero .container,
.product-section .container,
.product-footer .container {
    position: relative;
    z-index: 1;
}

.product-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.06fr) minmax(280px, 0.94fr);
    gap: clamp(32px, 6vw, 72px);
    align-items: center;
}

.product-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    color: var(--sf-green);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.product-eyebrow::before {
    content: "";
    width: 32px;
    height: 2px;
    border-radius: 999px;
    background: var(--sf-green);
}

.product-title {
    margin: 0;
    max-width: 820px;
    color: #fff;
    font-size: clamp(3.1rem, 8vw, 7.2rem);
    line-height: 0.98;
    letter-spacing: -0.065em;
}

.product-title span {
    display: block;
    background: linear-gradient(135deg, #fff 0%, var(--sf-green) 46%, var(--sf-cyan) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.product-lead {
    max-width: 760px;
    margin: 24px 0 0;
    color: #d7dde5;
    font-size: clamp(1.08rem, 2.1vw, 1.35rem);
}

.product-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.product-button,
.product-button-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    padding: 0 24px;
    border-radius: 999px;
    font-weight: 700;
}

.product-button {
    color: #081010;
    background: linear-gradient(135deg, var(--sf-green), var(--sf-cyan));
    box-shadow: 0 18px 48px rgba(4, 242, 199, 0.18);
}

.product-button:hover {
    color: #081010;
    transform: translateY(-2px);
}

.product-button-secondary {
    color: #fff;
    border: 1px solid var(--sf-line);
    background: rgba(255, 255, 255, 0.06);
}

.product-device-card {
    position: relative;
    min-height: 440px;
    padding: 28px;
    border: 1px solid var(--sf-line);
    border-radius: 42px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.035)),
        radial-gradient(circle at 42% 18%, rgba(199, 255, 46, 0.18), transparent 38%);
    box-shadow: 0 26px 90px rgba(0, 0, 0, 0.36);
}

.app-mark {
    width: 94px;
    height: 94px;
    border-radius: 24px;
    box-shadow: 0 0 42px rgba(4, 242, 199, 0.26);
}

.metric-stack {
    display: grid;
    gap: 14px;
    margin-top: 48px;
}

.metric-card {
    padding: 18px;
    border: 1px solid var(--sf-line);
    border-radius: 22px;
    background: rgba(0, 0, 0, 0.24);
}

.metric-card strong {
    display: block;
    color: var(--sf-green);
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1;
}

.metric-card span {
    color: var(--sf-muted);
    font-size: 0.95rem;
}

.product-section {
    padding: 84px 0;
}

.product-section.alt {
    background: rgba(255, 255, 255, 0.035);
}

.product-section h2,
.content-shell h1 {
    color: #fff;
}

.product-section-title {
    max-width: 820px;
    margin: 0 auto 38px;
    text-align: center;
}

.product-section-title h2 {
    margin: 0 0 12px;
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.08;
}

.product-section-title p {
    color: var(--sf-muted);
}

.product-card-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
}

.product-card {
    min-height: 190px;
    padding: 26px;
    border-radius: var(--sf-radius-lg);
    border: 1px solid var(--sf-line);
    background: var(--sf-panel);
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.18);
}

.product-card h3 {
    margin: 0 0 12px;
    color: var(--sf-green);
    font-size: 1.35rem;
}

.product-card p,
.product-card li,
.content-shell p,
.content-shell li {
    color: #d7dde5;
    overflow-wrap: anywhere;
}

.content-shell ul {
    padding-left: 20px;
}

.product-card ul {
    margin: 0;
    padding-left: 18px;
    list-style: disc;
}

.brand-note {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 34px;
}

.brand-note div {
    padding: 20px;
    border-radius: var(--sf-radius-md);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--sf-line);
}

.content-shell {
    width: min(920px, calc(100% - 40px));
    padding-top: 120px;
}

.content-shell section {
    border-color: var(--sf-line);
}

.content-shell h2 {
    color: var(--sf-green);
}

.content-shell .meta {
    color: var(--sf-muted);
}

.notice {
    width: 100%;
    max-width: 100%;
    padding: 18px 20px;
    box-sizing: border-box;
    border-color: rgba(199, 255, 46, 0.28);
    background: rgba(199, 255, 46, 0.08);
}

.notice p {
    margin: 0;
    max-width: calc(100vw - 80px);
    line-break: anywhere;
    word-break: break-word;
}

body.skippingfit-page.challenge-invite-page {
    --challenge-bg: #020506;
    --challenge-surface: rgba(255, 255, 255, 0.08);
    --challenge-surface-strong: rgba(255, 255, 255, 0.13);
    --challenge-text: var(--sf-text);
    --challenge-muted: var(--sf-muted);
    --challenge-accent: var(--sf-green);
    --challenge-cyan: var(--sf-cyan);
    --challenge-line: rgba(255, 255, 255, 0.14);
    inline-size: 100%;
    min-block-size: 100svb;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(circle at 50% 42%, rgba(4, 242, 199, 0.22), transparent 26%),
        radial-gradient(circle at 38% 42%, rgba(199, 255, 46, 0.1), transparent 22%),
        linear-gradient(180deg, #04070a 0%, #07100d 52%, #020304 100%);
}

.challenge-invite {
    flex: 1;
    inline-size: 100%;
    min-block-size: 0;
    margin: 0 auto;
    padding: clamp(1rem, 3vmin, 3rem);
    display: grid;
    place-items: center;
}

.challenge-invite,
.challenge-invite * {
    box-sizing: border-box;
}

.challenge-panel {
    position: relative;
    isolation: isolate;
    inline-size: 92vi;
    max-inline-size: 100%;
    min-inline-size: 0;
    display: grid;
    justify-items: center;
    gap: clamp(0.875rem, 1.6vmin, 1.25rem);
    padding: clamp(1.875rem, 4vmin, 3.25rem);
    border: 1px solid var(--challenge-line);
    border-radius: clamp(1.625rem, 3.5vmin, 2.25rem);
    background:
        radial-gradient(ellipse at 50% 44%, rgba(4, 242, 199, 0.42), transparent 34%),
        radial-gradient(ellipse at 42% 45%, rgba(199, 255, 46, 0.2), transparent 24%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.035) 58%, rgba(255, 255, 255, 0.02));
    box-shadow:
        0 36px 110px rgba(0, 0, 0, 0.44),
        inset 0 0 0 1px rgba(255, 255, 255, 0.045);
    overflow: hidden;
    text-align: center;
}

.challenge-panel::before {
    content: "";
    position: absolute;
    inset: -18%;
    z-index: -1;
    background:
        repeating-conic-gradient(
            from -18deg at 50% 43%,
            transparent 0deg 8.8deg,
            rgba(199, 255, 46, 0.24) 9.2deg 9.8deg,
            transparent 10.6deg 21deg
        ),
        repeating-conic-gradient(
            from 4deg at 50% 43%,
            transparent 0deg 14deg,
            rgba(4, 242, 199, 0.22) 14.5deg 15.2deg,
            transparent 15.8deg 34deg
        ),
        radial-gradient(ellipse at 50% 43%, rgba(199, 255, 46, 0.24), transparent 19%),
        radial-gradient(ellipse at 50% 43%, transparent 0 18%, rgba(4, 242, 199, 0.16) 20%, transparent 48%);
    -webkit-mask-image: radial-gradient(circle at 50% 43%, transparent 0 17%, rgba(0, 0, 0, 0.92) 30%, rgba(0, 0, 0, 0.56) 55%, transparent 74%);
    mask-image: radial-gradient(circle at 50% 43%, transparent 0 17%, rgba(0, 0, 0, 0.92) 30%, rgba(0, 0, 0, 0.56) 55%, transparent 74%);
    opacity: 0.82;
    mix-blend-mode: screen;
    pointer-events: none;
}

.challenge-panel::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(circle at 18% 30%, rgba(199, 255, 46, 0.48) 0 1px, transparent 2px),
        radial-gradient(circle at 24% 42%, rgba(4, 242, 199, 0.42) 0 1px, transparent 2px),
        radial-gradient(circle at 34% 24%, rgba(199, 255, 46, 0.34) 0 1px, transparent 2px),
        radial-gradient(circle at 66% 28%, rgba(4, 242, 199, 0.38) 0 1px, transparent 2px),
        radial-gradient(circle at 74% 44%, rgba(199, 255, 46, 0.46) 0 1px, transparent 2px),
        radial-gradient(circle at 82% 34%, rgba(4, 242, 199, 0.34) 0 1px, transparent 2px),
        radial-gradient(circle at 47% 36%, rgba(4, 242, 199, 0.3) 0 1px, transparent 2px),
        radial-gradient(circle at 56% 50%, rgba(199, 255, 46, 0.32) 0 1px, transparent 2px);
    opacity: 0.56;
    mix-blend-mode: screen;
    pointer-events: none;
}

.challenge-copy,
.challenge-card {
    inline-size: 100%;
    min-inline-size: 0;
    max-inline-size: 100%;
}

.challenge-copy {
    display: grid;
    justify-items: center;
}

.challenge-brand-mark {
    width: clamp(4.75rem, 9vmin, 7rem);
    height: clamp(4.75rem, 9vmin, 7rem);
    border-radius: 24%;
    object-fit: cover;
    box-shadow:
        0 0 48px rgba(4, 242, 199, 0.42),
        0 22px 58px rgba(0, 0, 0, 0.42),
        0 0 0 1px rgba(255, 255, 255, 0.16);
}

.challenge-kicker {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.challenge-copy h1 {
    max-inline-size: 12ch;
    margin: clamp(1.375rem, 2.4vmin, 2rem) 0 0;
    color: var(--challenge-text);
    font-size: clamp(3rem, 7.5vmin, 6rem);
    line-height: 1;
    letter-spacing: 0;
    text-shadow: 0 8px 28px rgba(0, 0, 0, 0.32);
    overflow-wrap: anywhere;
    word-break: break-word;
}

.challenge-copy h1 span {
    display: block;
}

.challenge-summary {
    max-inline-size: 22ch;
    margin: 0.625rem 0 0;
    color: rgba(247, 250, 252, 0.72);
    font-size: clamp(1.125rem, 2.4vmin, 1.5rem);
    font-weight: 700;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.challenge-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: clamp(0.875rem, 2vmin, 1.25rem);
    inline-size: min(70vi, 100%);
    margin: 0;
}

.challenge-actions .product-button,
.challenge-actions .product-button-secondary {
    min-block-size: clamp(3.625rem, 6vmin, 4.5rem);
    flex: 1 1 14rem;
    min-inline-size: 0;
    justify-content: center;
    text-align: center;
    font-size: clamp(1.125rem, 2.4vmin, 1.625rem);
    font-weight: 900;
}

.challenge-guidance {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.challenge-card {
    display: grid;
    justify-items: center;
    gap: clamp(1.125rem, 2vmin, 1.5rem);
    max-inline-size: 100%;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    overflow: visible;
}

.challenge-score {
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: clamp(0.5rem, 1vmin, 0.875rem);
    color: var(--challenge-accent);
    text-shadow: 0 0 34px rgba(199, 255, 46, 0.22);
}

.challenge-score span {
    font-size: clamp(7rem, 16vmin, 12rem);
    line-height: 0.84;
    font-weight: 950;
    letter-spacing: 0;
}

.challenge-score small {
    color: var(--challenge-accent);
    font-size: clamp(2rem, 4.8vmin, 3rem);
    font-weight: 950;
}

.challenge-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    inline-size: min(78vi, 100%);
    min-block-size: clamp(5.25rem, 9vmin, 6.5rem);
    border: 1px solid var(--challenge-line);
    border-radius: 24px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.045)),
        rgba(5, 10, 12, 0.52);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.24);
    overflow: hidden;
}

.challenge-metrics div {
    position: relative;
    display: flex;
    text-align: center;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0.875rem 0.75rem;
    background: transparent;
    border: 0;
}

.challenge-metrics div + div::before {
    content: "";
    position: absolute;
    left: 0;
    top: 22%;
    bottom: 22%;
    width: 1px;
    background: rgba(255, 255, 255, 0.22);
}

.challenge-metrics strong,
.challenge-metrics span {
    display: block;
}

.challenge-metrics strong {
    color: var(--challenge-cyan);
    font-size: clamp(1.3125rem, 3.4vmin, 2.125rem);
    line-height: 1.1;
    font-weight: 900;
}

.challenge-metrics span {
    order: -1;
    margin: 0 0 0.375rem;
    color: rgba(247, 250, 252, 0.68);
    font-size: clamp(0.75rem, 1.5vmin, 0.9375rem);
    font-weight: 700;
}

.challenge-rhythm {
    inline-size: min(82vi, 100%);
    block-size: clamp(3.125rem, 7vmin, 4.125rem);
    display: flex;
    align-items: end;
    justify-content: center;
    gap: clamp(0.25rem, 0.7vmin, 0.5rem);
    margin: -0.25rem 0 0;
}

.challenge-rhythm i {
    flex: 1;
    min-inline-size: 0;
    max-inline-size: 1.375rem;
    border-radius: 999px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.46), transparent 24%),
        linear-gradient(180deg, var(--challenge-accent) 0%, #70ff63 42%, var(--challenge-cyan) 100%);
    box-shadow:
        0 0 26px rgba(4, 242, 199, 0.44),
        0 0 16px rgba(199, 255, 46, 0.28),
        inset 0 1px 0 rgba(255, 255, 255, 0.34);
    opacity: 0.32;
    -webkit-box-reflect: below 6px linear-gradient(transparent, rgba(255, 255, 255, 0.16));
}

.challenge-rhythm i:nth-child(1),
.challenge-rhythm i:nth-child(2),
.challenge-rhythm i:nth-child(23),
.challenge-rhythm i:nth-child(24) { height: 34%; opacity: 0.28; }
.challenge-rhythm i:nth-child(3),
.challenge-rhythm i:nth-child(22) { height: 44%; opacity: 0.38; }
.challenge-rhythm i:nth-child(4),
.challenge-rhythm i:nth-child(21) { height: 50%; opacity: 0.5; }
.challenge-rhythm i:nth-child(5),
.challenge-rhythm i:nth-child(20) { height: 56%; opacity: 0.58; }
.challenge-rhythm i:nth-child(6),
.challenge-rhythm i:nth-child(19) { height: 62%; opacity: 0.66; }
.challenge-rhythm i:nth-child(7),
.challenge-rhythm i:nth-child(18) { height: 68%; opacity: 0.74; }
.challenge-rhythm i:nth-child(8),
.challenge-rhythm i:nth-child(17) { height: 76%; opacity: 0.82; }
.challenge-rhythm i:nth-child(9),
.challenge-rhythm i:nth-child(16) { height: 84%; opacity: 0.9; }
.challenge-rhythm i:nth-child(10),
.challenge-rhythm i:nth-child(15) { height: 72%; opacity: 0.82; }
.challenge-rhythm i:nth-child(11),
.challenge-rhythm i:nth-child(14) { height: 90%; opacity: 0.94; }
.challenge-rhythm i:nth-child(12),
.challenge-rhythm i:nth-child(13) { height: 100%; opacity: 1; }

.challenge-details {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: 0;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.challenge-footer {
    inline-size: 100%;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.625rem 1rem;
    padding: 0 1.25rem 1.625rem;
    border: 0;
    background: transparent;
    color: var(--challenge-muted);
    font-size: 0.8125rem;
}

.challenge-footer span {
    color: rgba(247, 250, 252, 0.62);
}

.challenge-footer a {
    color: rgba(4, 242, 199, 0.72);
    text-decoration: none;
}

.challenge-footer a:hover {
    color: var(--challenge-cyan);
}

.content-page .product-actions {
    align-items: stretch;
}

.content-page .product-button,
.content-page .product-button-secondary {
    flex: 1 1 190px;
    min-width: 0;
    text-align: center;
}

.product-footer {
    padding: 44px 0;
    border-top: 1px solid var(--sf-line);
    background: rgba(0, 0, 0, 0.22);
    color: var(--sf-muted);
}

.product-footer a {
    color: var(--sf-green);
}

@media (max-width: 900px) {
    .product-hero-grid,
    .brand-note {
        grid-template-columns: 1fr;
    }

    .product-card-grid {
        grid-template-columns: 1fr;
    }

    .product-device-card {
        min-height: auto;
    }
}

@media (max-width: 640px) {
    #header .container {
        min-height: 92px;
        align-items: flex-start;
        flex-direction: column;
        justify-content: center;
        gap: 10px;
    }

    .nav-links {
        gap: 18px;
        flex-wrap: wrap;
        font-size: 0.92rem;
    }

    body.skippingfit-page .product-hero {
        padding-top: 174px;
    }

    .product-actions {
        flex-direction: column;
    }

    .product-button,
    .product-button-secondary {
        width: 100%;
        flex: none;
    }

    .content-page .product-button,
    .content-page .product-button-secondary {
        flex: none;
    }

}

@media (orientation: portrait) {
    .challenge-invite {
        padding: clamp(0.75rem, 4vi, 2rem);
    }

    .challenge-panel {
        inline-size: 100%;
        gap: clamp(0.875rem, 3vi, 1.125rem);
        padding: clamp(1.5rem, 6vi, 2rem);
        border-radius: clamp(1.5rem, 7vi, 2rem);
    }

    .challenge-panel::before {
        opacity: 0.78;
    }

    .challenge-brand-mark {
        width: clamp(5rem, 22vi, 6rem);
        height: clamp(5rem, 22vi, 6rem);
    }

    .challenge-copy h1 {
        margin-top: clamp(1.25rem, 5vi, 1.75rem);
        font-size: clamp(2.75rem, 14vi, 3.5rem);
    }

    .challenge-summary {
        font-size: clamp(1.125rem, 5.2vi, 1.375rem);
    }

    .challenge-score span {
        font-size: clamp(5.25rem, 26vi, 6.75rem);
    }

    .challenge-score small {
        font-size: clamp(1.375rem, 6vi, 1.875rem);
    }

    .challenge-metrics {
        inline-size: 100%;
        min-block-size: clamp(5.25rem, 22vi, 6rem);
        border-radius: clamp(1rem, 5vi, 1.25rem);
    }

    .challenge-metrics div {
        min-inline-size: 0;
        padding-inline: clamp(0.375rem, 1.8vi, 0.625rem);
    }

    .challenge-metrics strong {
        max-inline-size: 100%;
        font-size: clamp(0.9375rem, 4.6vi, 1.25rem);
        white-space: nowrap;
    }

    .challenge-metrics span {
        font-size: clamp(0.6875rem, 3vi, 0.8125rem);
    }

    .challenge-rhythm {
        inline-size: 100%;
        block-size: clamp(3rem, 13vi, 3.75rem);
        gap: clamp(0.25rem, 1.4vi, 0.375rem);
    }

    .challenge-actions {
        inline-size: 100%;
        flex-direction: column;
        gap: clamp(0.75rem, 3vi, 1rem);
    }

    .challenge-actions .product-button,
    .challenge-actions .product-button-secondary {
        width: 100%;
        flex: none;
        min-block-size: clamp(3.5rem, 15vi, 4rem);
        font-size: clamp(1.125rem, 5vi, 1.375rem);
    }

    .challenge-footer {
        inline-size: 100%;
        padding: 0 clamp(1rem, 4vi, 1.5rem) clamp(1rem, 5vi, 1.5rem);
        font-size: clamp(0.75rem, 3vi, 0.8125rem);
    }

    .challenge-footer a {
        flex-basis: 100%;
    }
}

/* 2026 production site refresh. Keep this block last so challenge invite legacy styles stay intact. */
body.skippingfit-page {
    background:
        linear-gradient(120deg, rgba(199, 255, 46, 0.08), transparent 26%),
        linear-gradient(180deg, #05080c 0%, #071015 48%, #020304 100%);
}

.site-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

body.skippingfit-page #header.site-header {
    background: rgba(3, 7, 11, 0.82);
    box-shadow: none;
}

.site-header-inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 24px;
}

#header .container.site-header-inner {
    display: grid;
    align-items: center;
    justify-content: initial;
    min-height: 74px;
}

.brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    font-weight: 800;
}

.brand-lockup img {
    width: 42px;
    height: 42px;
    border-radius: 8px;
    box-shadow: 0 0 24px rgba(199, 255, 46, 0.2);
}

.site-header nav {
    justify-self: center;
}

.nav-links a {
    position: relative;
    padding: 24px 0 20px;
    font-size: 0.94rem;
}

.nav-links a:hover::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 12px;
    height: 2px;
    background: var(--sf-green);
}

.language-switch {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--sf-muted);
    font-size: 0.82rem;
    font-weight: 700;
}

.language-switch select,
.legal-topbar select {
    min-height: 34px;
    border: 1px solid var(--sf-line);
    border-radius: 8px;
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
    padding: 0 10px;
}

.home-hero {
    position: relative;
    overflow: hidden;
    padding: 138px 0 72px;
}

.home-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
    align-items: center;
    gap: clamp(36px, 7vw, 90px);
}

.hero-copy h1,
.support-hero h1 {
    margin: 0;
    color: #fff;
    font-size: clamp(3rem, 7vw, 6rem);
    line-height: 1.04;
    letter-spacing: 0;
}

.hero-copy h1 span,
.support-hero h1 span {
    color: var(--sf-green);
}

.hero-copy p,
.support-hero p,
.section-heading p,
.record-panel p,
.input-grid p,
.faq-group p,
.contact-panel p,
.contact-panel dd {
    color: #c7ced8;
}

.hero-copy > p,
.support-hero p {
    max-width: 620px;
    margin-top: 22px;
    font-size: clamp(1.08rem, 2vw, 1.34rem);
}

.hero-product {
    position: relative;
    min-height: 520px;
}

.rope-arc {
    position: absolute;
    inset: 4% -4% 16% 20%;
    border: 2px solid transparent;
    border-top-color: var(--sf-green);
    border-right-color: var(--sf-cyan);
    border-radius: 50%;
    transform: rotate(12deg);
    opacity: 0.8;
    box-shadow: 0 -8px 28px rgba(4, 242, 199, 0.16);
}

.phone-frame,
.watch-frame,
.feature-strip,
.input-grid article,
.record-panel,
.faq-panel,
.contact-panel {
    border: 1px solid var(--sf-line);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.035)),
        rgba(7, 14, 18, 0.72);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

.phone-frame {
    position: relative;
    z-index: 2;
    width: min(330px, 66%);
    min-height: 500px;
    margin: 0 auto;
    padding: 26px 24px;
    border-radius: 36px;
}

.phone-top,
.mini-stats {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    color: #cbd3dc;
    font-size: 0.78rem;
}

.phone-frame > p {
    margin: 22px 0 12px;
    color: #fff;
    font-weight: 800;
}

.progress-ring {
    display: grid;
    place-items: center;
    width: 174px;
    height: 174px;
    margin: 0 auto 24px;
    border-radius: 50%;
    background:
        radial-gradient(circle, rgba(7, 14, 18, 0.96) 55%, transparent 56%),
        conic-gradient(var(--sf-cyan), var(--sf-green), rgba(255, 255, 255, 0.12) 76%);
}

.progress-ring span,
.progress-ring small {
    color: var(--sf-muted);
    font-size: 0.78rem;
}

.progress-ring strong {
    margin: -20px 0;
    color: #fff;
    font-size: 3.1rem;
    line-height: 1;
}

.mini-stats div {
    display: grid;
    gap: 4px;
    text-align: center;
}

.mini-stats strong {
    color: #fff;
    font-size: 1rem;
}

.week-bars {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    align-items: end;
    height: 74px;
    margin-top: 28px;
    gap: 8px;
}

.week-bars i {
    border-radius: 999px 999px 4px 4px;
    background: linear-gradient(180deg, var(--sf-green), var(--sf-cyan));
}

.week-bars i:nth-child(1) { height: 40%; opacity: 0.55; }
.week-bars i:nth-child(2) { height: 62%; }
.week-bars i:nth-child(3) { height: 54%; opacity: 0.8; }
.week-bars i:nth-child(4) { height: 86%; }
.week-bars i:nth-child(5) { height: 70%; }
.week-bars i:nth-child(6) { height: 96%; }
.week-bars i:nth-child(7) { height: 48%; opacity: 0.6; }

.watch-frame {
    position: absolute;
    z-index: 3;
    right: 6%;
    bottom: 46px;
    width: 148px;
    padding: 18px;
    border-radius: 30px;
    text-align: center;
}

.watch-frame img {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    border-radius: 8px;
}

.watch-frame strong {
    display: block;
    color: var(--sf-green);
    font-size: 3.4rem;
    line-height: 1;
}

.feature-strip {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
    border-radius: 8px;
}

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

.feature-strip article {
    padding: 30px 28px;
    text-align: center;
}

.feature-strip article + article {
    border-left: 1px solid var(--sf-line);
}

.feature-strip h2,
.input-grid h3,
.record-panel h3,
.faq-group h3,
.contact-panel h2 {
    color: #fff;
    font-size: 1.12rem;
}

.line-icon {
    width: 34px;
    height: 34px;
    margin: 0 auto 16px;
    color: var(--sf-green);
    border: 2px solid currentColor;
}

.target-icon { border-radius: 50%; box-shadow: inset 0 0 0 8px #071015; }
.bolt-icon { clip-path: polygon(54% 0, 18% 54%, 48% 54%, 38% 100%, 84% 40%, 54% 40%); background: var(--sf-cyan); border: 0; }
.bars-icon { border: 0; background: linear-gradient(90deg, var(--sf-green) 0 18%, transparent 18% 28%, var(--sf-cyan) 28% 48%, transparent 48% 58%, var(--sf-green) 58% 78%, transparent 78%); }
.trophy-icon { border-radius: 0 0 12px 12px; }

.section-heading {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}

.section-heading.align-left {
    margin: 0;
    text-align: left;
}

.section-heading h2 {
    margin: 0 0 12px;
    color: #fff;
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.08;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.input-grid article {
    min-height: 178px;
    padding: 24px;
    border-radius: 8px;
}

.device-dot {
    display: block;
    width: 36px;
    height: 36px;
    margin-bottom: 20px;
    border-radius: 50%;
    background: var(--sf-green);
    box-shadow: 0 0 28px rgba(199, 255, 46, 0.34);
}

.device-dot.cyan { background: var(--sf-cyan); }
.device-dot.orange { background: var(--sf-orange); }

.records-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.88fr) minmax(320px, 1.12fr);
    align-items: start;
    gap: clamp(28px, 6vw, 70px);
}

.record-panel {
    display: grid;
    gap: 0;
    border-radius: 8px;
}

.record-panel article {
    padding: 26px;
}

.record-panel article + article {
    border-top: 1px solid var(--sf-line);
}

.support-hero {
    padding: 132px 0 52px;
}

.support-hero-grid,
.support-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(290px, 0.42fr);
    gap: 28px;
    align-items: center;
}

.support-mark {
    display: grid;
    place-items: center;
    min-height: 260px;
    border-radius: 8px;
    background:
        radial-gradient(circle, rgba(4, 242, 199, 0.28), transparent 42%),
        radial-gradient(circle, rgba(199, 255, 46, 0.16), transparent 58%);
}

.support-mark img {
    width: 116px;
    height: 116px;
    border-radius: 24px;
    box-shadow: 0 0 60px rgba(4, 242, 199, 0.32);
}

.support-content {
    padding: 20px 0 86px;
}

.support-grid {
    align-items: start;
}

.faq-panel,
.contact-panel {
    border-radius: 8px;
    padding: 28px;
}

.faq-group {
    padding-top: 26px;
}

.faq-group + .faq-group {
    margin-top: 20px;
    border-top: 1px solid var(--sf-line);
}

.faq-group h3 {
    margin-bottom: 10px;
    color: var(--sf-green);
}

details {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 14px 0;
}

summary {
    cursor: pointer;
    color: #fff;
    font-weight: 800;
}

summary::marker {
    color: var(--sf-green);
}

details p {
    margin: 10px 0 0;
}

.contact-panel {
    position: sticky;
    top: 96px;
}

.contact-panel dl {
    display: grid;
    gap: 18px;
    margin: 28px 0;
}

.contact-panel dt {
    color: var(--sf-muted);
    font-size: 0.78rem;
    font-weight: 800;
    text-transform: uppercase;
}

.contact-panel dd {
    margin: 4px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr repeat(3, minmax(120px, 0.6fr));
    gap: 34px;
    align-items: start;
}

.footer-grid h2 {
    margin: 0 0 12px;
    color: #fff;
    font-size: 0.92rem;
}

.footer-grid a {
    display: block;
    margin: 8px 0;
    color: #cbd3dc;
}

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

.footer-copy {
    width: min(1180px, calc(100% - 40px));
    margin: 28px auto 0;
    color: rgba(255, 255, 255, 0.42);
    font-size: 0.86rem;
}

.legal-shell {
    padding-top: 132px;
    padding-bottom: 72px;
}

.legal-shell,
.legal-document {
    color: #e9edf2;
}

.legal-shell h1,
.legal-document h1 {
    color: #fff;
    font-size: clamp(2.2rem, 5vw, 4rem);
    line-height: 1.08;
}

.legal-shell section {
    margin-top: 26px;
    padding-top: 26px;
    border-top: 1px solid var(--sf-line);
}

.legal-shell h2,
.legal-document h2 {
    color: var(--sf-green);
    font-size: 1.08rem;
}

.simple-footer {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px 18px;
    padding: 32px 20px;
    border-top: 1px solid var(--sf-line);
}

body.legal-page {
    margin: 0;
    background: #fff;
    color: #222;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.75;
}

.legal-document {
    max-width: 880px;
    margin: 0 auto;
    padding: 32px 20px 64px;
    color: #222;
}

.legal-document h1 {
    color: #111;
    text-align: center;
}

.legal-document h2 {
    margin-top: 30px;
    padding-left: 10px;
    border-left: 4px solid #111;
    color: #111;
}

.legal-document .version {
    text-align: center;
    color: #666;
}

.legal-document .notice {
    border: 1px solid #ddd;
    background: #f7faf9;
    color: #444;
}

.legal-topbar {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    margin-bottom: 28px;
}

.legal-topbar a {
    color: #111;
    font-weight: 800;
}

.legal-topbar label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #666;
}

.legal-topbar select {
    color: #111;
    background: #fff;
    border-color: #ddd;
}

[dir="rtl"] .section-heading.align-left {
    text-align: right;
}

[dir="rtl"] .feature-strip article + article {
    border-left: 0;
    border-right: 1px solid var(--sf-line);
}

@media (max-width: 920px) {
    .site-header-inner,
    .home-hero-grid,
    .support-hero-grid,
    .support-grid,
    .records-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

    .site-header-inner {
        gap: 10px;
        padding: 12px 0;
    }

    #header .container.site-header-inner {
        display: grid;
        min-height: 0;
        align-items: center;
    }

    .site-header nav {
        justify-self: start;
        width: 100%;
        overflow-x: auto;
    }

    .nav-links {
        gap: 20px;
        white-space: nowrap;
    }

    .language-switch {
        justify-self: start;
    }

    .home-hero {
        padding-top: 170px;
    }

    .support-hero,
    .content-shell,
    .legal-shell {
        padding-top: 190px;
    }

    .hero-product {
        min-height: 430px;
    }

    .phone-frame {
        width: min(330px, 82%);
    }

    .feature-strip-grid,
    .input-grid {
        grid-template-columns: 1fr;
    }

    .feature-strip article + article,
    [dir="rtl"] .feature-strip article + article {
        border-left: 0;
        border-right: 0;
        border-top: 1px solid var(--sf-line);
    }

    .contact-panel {
        position: static;
    }
}

@media (max-width: 640px) {
    .container,
    .feature-strip,
    .footer-copy {
        width: min(100% - 28px, 1180px);
    }

    .hero-copy h1,
    .support-hero h1 {
        font-size: clamp(2.55rem, 14vw, 4.1rem);
    }

    .product-actions {
        flex-direction: column;
    }

    .product-button,
    .product-button-secondary {
        width: 100%;
    }

    .watch-frame {
        right: 0;
        bottom: 24px;
    }
}