/* ============================================================
   六道裂隙 · 宣传首页样式（/bros）
   手机优先：默认按窄屏排版，再往上用媒体查询放宽。
   页面结构见 bros/index.html，交互见 bros/js/landing.js。
   ============================================================ */

:root {
    --bg: #070918;
    --bg-soft: #0c1027;
    --purple: #8d5cff;
    --purple-deep: #7045f5;
    --blue: #47c8ff;
    --gold: #ffcc70;
    --text: #f4f5ff;
    --sub: #a8aed0;
    --line: rgba(157, 139, 255, 0.25);
    --card: rgba(21, 25, 59, 0.78);
    --pad: clamp(1.1rem, 4.5vw, 2.6rem);
    --nav-h: 64px;
    --radius: 14px;
}

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

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

body {
    min-width: 320px;
    overflow-x: hidden;
    color: var(--text);
    background: var(--bg);
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
    line-height: 1.6;
    -webkit-tap-highlight-color: transparent;
}

body::before {
    content: "";
    position: fixed;
    z-index: -2;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 15% 10%, rgba(80, 82, 255, 0.2), transparent 28%),
        radial-gradient(circle at 82% 23%, rgba(207, 75, 255, 0.15), transparent 24%),
        radial-gradient(circle at 50% 85%, rgba(27, 170, 255, 0.1), transparent 30%),
        var(--bg);
}

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

a {
    color: inherit;
}

:focus-visible {
    outline: 2px solid var(--blue);
    outline-offset: 3px;
    border-radius: 6px;
}

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    z-index: 200;
    padding: 10px 16px;
    background: var(--purple-deep);
    border-radius: 0 0 10px 0;
}

.skip-link:focus {
    left: 0;
}

/* ==================== 顶部导航 ==================== */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(7, 9, 24, 0.82);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(14px);
}

.site-nav__inner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-height: var(--nav-h);
    padding: 0.4rem var(--pad);
    padding-left: max(0.9rem, env(safe-area-inset-left));
    padding-right: max(0.9rem, env(safe-area-inset-right));
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.15rem;
    font-weight: 900;
    letter-spacing: 2px;
    text-decoration: none;
    white-space: nowrap;
}

.brand__mark {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    color: var(--gold);
    border: 1px solid var(--purple);
    border-radius: 50%;
    box-shadow: 0 0 18px rgba(141, 92, 255, 0.8);
}

.nav-links {
    display: none;
}

.nav-cta {
    margin-left: auto;
}

/* 手机上的折叠菜单（用 details，没 JS 也能用） */
.nav-mobile {
    position: relative;
    order: 2;
}

.nav-mobile > summary {
    display: grid;
    gap: 4px;
    place-content: center;
    width: 44px;
    height: 44px;
    list-style: none;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 12px;
    cursor: pointer;
}

.nav-mobile > summary::-webkit-details-marker {
    display: none;
}

.nav-mobile > summary span {
    display: block;
    width: 18px;
    height: 2px;
    background: #dfe3ff;
    border-radius: 2px;
}

.nav-mobile nav {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    z-index: 120;
    display: grid;
    min-width: 11rem;
    padding: 0.4rem;
    background: rgba(12, 16, 39, 0.98);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
}

.nav-mobile nav a {
    padding: 0.65rem 0.8rem;
    color: #cdd0ed;
    font-size: 0.92rem;
    text-decoration: none;
    border-radius: 9px;
}

.nav-mobile nav a:hover,
.nav-mobile nav a.is-active {
    color: #fff;
    background: rgba(141, 92, 255, 0.18);
}

.nav-progress {
    height: 2px;
    background: linear-gradient(90deg, var(--purple) 0%, var(--blue) 100%);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.15s linear;
}

/* ==================== 按钮 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.7rem 1.4rem;
    color: #fff;
    font-size: 0.98rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.2s ease, filter 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    touch-action: manipulation;
}

.btn--primary {
    background: linear-gradient(135deg, var(--purple-deep), #aa4fff);
    box-shadow: 0 7px 25px rgba(127, 75, 255, 0.35);
}

.btn--primary:hover {
    filter: brightness(1.12);
    box-shadow: 0 12px 32px rgba(127, 75, 255, 0.5);
    transform: translateY(-2px);
}

.btn--ghost {
    color: #e9eaff;
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(201, 202, 255, 0.45);
}

.btn--ghost:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
}

.btn--lg {
    padding: 0.9rem 2rem;
    font-size: 1.05rem;
}

.nav-cta.btn {
    min-height: 38px;
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
}

/* ==================== 首屏 ==================== */
.hero {
    position: relative;
    display: grid;
    gap: 1.75rem;
    align-items: center;
    padding: clamp(2.2rem, 7vw, 4.5rem) var(--pad) clamp(2.5rem, 8vw, 5rem);
    overflow: hidden;
}

.hero__tag {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    margin-bottom: 1rem;
    color: #d8c7ff;
    font-size: 0.8rem;
    letter-spacing: 1px;
    background: rgba(130, 76, 235, 0.12);
    border: 1px solid rgba(177, 132, 255, 0.55);
    border-radius: 30px;
}

.hero h1 {
    font-size: clamp(2.6rem, 13vw, 5.6rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: clamp(2px, 1.2vw, 8px);
    background: linear-gradient(135deg, #ffffff 20%, #c5a4ff 54%, #6bd5ff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__sub {
    margin-top: 0.6rem;
    color: #e7d9ff;
    font-size: clamp(1.05rem, 4vw, 1.6rem);
    font-weight: 500;
    letter-spacing: clamp(1px, 0.8vw, 6px);
}

.hero__desc {
    max-width: 34rem;
    margin: 1.1rem 0 1.5rem;
    color: var(--sub);
    font-size: 0.98rem;
    line-height: 1.95;
}

.hero__desc .highlight {
    color: var(--gold);
    font-weight: 700;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.hero__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 0.9rem;
    margin-top: 1.4rem;
    color: #8f97bd;
    font-size: 0.82rem;
    list-style: none;
}

.hero__meta li::before {
    content: "◆";
    margin-right: 0.4rem;
    color: var(--purple);
}

.hero-card {
    position: relative;
    padding: 1.1rem 1.2rem 1.3rem;
    background: linear-gradient(145deg, rgba(32, 35, 82, 0.85), rgba(11, 13, 38, 0.75));
    border: 1px solid rgba(181, 146, 255, 0.4);
    border-radius: 16px;
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.45);
}

.hero-card__rarity {
    color: var(--gold);
    font-size: 0.75rem;
    letter-spacing: 2px;
}

.hero-card h2 {
    margin: 0.3rem 0 0.15rem;
    font-size: 1.7rem;
    letter-spacing: 4px;
}

.hero-card__role {
    color: #aeb7e3;
    font-size: 0.82rem;
}

.hero-card__skill {
    padding-top: 0.75rem;
    margin-top: 0.85rem;
    color: #d9c8ff;
    font-size: 0.82rem;
    line-height: 1.7;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-card__skill strong {
    color: var(--gold);
}

/* 首屏右侧的装饰环：只在宽屏出现，手机上省电省地方 */
.hero__ring {
    display: none;
}

/* ==================== 通用区块 ==================== */
.section {
    padding: clamp(2.6rem, 8vw, 5rem) var(--pad);
    scroll-margin-top: calc(var(--nav-h) + 12px);
}

.section--alt {
    background: linear-gradient(180deg, rgba(13, 17, 44, 0.65), rgba(7, 9, 24, 0));
    border-block: 1px solid rgba(255, 255, 255, 0.05);
}

.section__title {
    font-size: clamp(1.4rem, 5.2vw, 2.1rem);
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: 1px;
}

.section__title::after {
    content: "";
    display: block;
    width: 56px;
    height: 3px;
    margin-top: 0.7rem;
    background: linear-gradient(90deg, var(--purple), var(--blue));
    border-radius: 3px;
}

.section__desc {
    max-width: 46rem;
    margin-top: 0.9rem;
    color: var(--sub);
    font-size: 0.95rem;
    line-height: 1.9;
}

.section__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1.6rem;
}

.section__foot {
    margin-top: 1.5rem;
}

/* 特色卡片 */
.features {
    display: grid;
    gap: 1rem;
    margin-top: 1.8rem;
}

.feature {
    position: relative;
    padding: 1.4rem 1.3rem 1.5rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.feature:hover {
    border-color: rgba(181, 146, 255, 0.55);
    transform: translateY(-4px);
}

.feature__num {
    color: rgba(255, 255, 255, 0.16);
    font-size: 2rem;
    font-weight: 900;
    line-height: 1;
}

.feature__icon {
    margin: 0.35rem 0 0.5rem;
    color: var(--blue);
    font-size: 1.5rem;
}

.feature h3 {
    font-size: 1.05rem;
    letter-spacing: 1px;
}

.feature p {
    margin-top: 0.5rem;
    color: var(--sub);
    font-size: 0.88rem;
    line-height: 1.85;
}

/* ==================== 英雄阵容 ==================== */
.hero-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
    margin-top: 1.7rem;
}

.hero-mini {
    display: flex;
    flex-direction: column;
    padding: 0.7rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.hero-mini:hover {
    border-color: rgba(181, 146, 255, 0.55);
    transform: translateY(-3px);
}

.hero-mini__thumb {
    position: relative;
    display: grid;
    place-items: center;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    font-size: 1.8rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.7);
    background: radial-gradient(circle at 50% 35%, rgba(141, 92, 255, 0.35), rgba(12, 16, 39, 0.9));
    border-radius: 10px;
}

.hero-mini__thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.92;
}

.hero-mini__thumb img[data-failed="1"] {
    display: none;
}

.hero-mini h3 {
    margin-top: 0.55rem;
    font-size: 0.98rem;
    letter-spacing: 1px;
}

.hero-mini__passive {
    margin-top: 0.15rem;
    color: var(--gold);
    font-size: 0.72rem;
}

.hero-mini__skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.5rem;
    list-style: none;
}

.hero-mini__skills li {
    padding: 0.1rem 0.4rem;
    color: #b9c1e6;
    font-size: 0.68rem;
    background: rgba(141, 92, 255, 0.14);
    border: 1px solid rgba(141, 92, 255, 0.24);
    border-radius: 999px;
}

/* ==================== 联机步骤 ==================== */
.steps {
    display: grid;
    gap: 0.8rem;
    margin-top: 1.7rem;
    list-style: none;
    counter-reset: step;
}

.steps li {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: 0.2rem 0.9rem;
    padding: 1rem 1.1rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.steps__num {
    grid-row: span 2;
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    color: #fff;
    font-weight: 800;
    background: linear-gradient(135deg, var(--purple-deep), #aa4fff);
    border-radius: 10px;
}

.steps h3 {
    font-size: 0.98rem;
}

.steps p {
    color: var(--sub);
    font-size: 0.85rem;
    line-height: 1.8;
}

.steps code {
    padding: 0.05rem 0.35rem;
    color: var(--gold);
    font-size: 0.85rem;
    background: rgba(255, 204, 112, 0.1);
    border-radius: 5px;
}

/* ==================== 底部行动区 / 页脚 ==================== */
.cta {
    padding: clamp(2.4rem, 8vw, 4rem) var(--pad);
    text-align: center;
}

.cta__box {
    max-width: 46rem;
    margin: 0 auto;
    padding: clamp(1.6rem, 6vw, 2.6rem);
    background: linear-gradient(145deg, rgba(112, 69, 245, 0.22), rgba(12, 16, 39, 0.9));
    border: 1px solid rgba(181, 146, 255, 0.35);
    border-radius: 18px;
}

.cta h2 {
    font-size: clamp(1.3rem, 5.4vw, 1.9rem);
    letter-spacing: 1px;
}

.cta p {
    margin: 0.8rem auto 1.4rem;
    color: var(--sub);
    font-size: 0.92rem;
    line-height: 1.9;
}

.site-foot {
    padding: 2rem var(--pad);
    padding-bottom: max(2rem, env(safe-area-inset-bottom));
    color: #6f779b;
    font-size: 0.78rem;
    line-height: 1.9;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* 滚动进场：没有 JS / 关掉动画时内容照常显示 */
.reveal {
    opacity: 1;
}

.js-reveal .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.js-reveal .reveal.is-in {
    opacity: 1;
    transform: none;
}

/* ==================== 宽屏 ==================== */
@media (min-width: 640px) {
    .hero__actions .btn,
    .section__actions .btn {
        min-width: 10rem;
    }
}

@media (min-width: 861px) {
    :root {
        --nav-h: 76px;
    }

    .nav-mobile {
        display: none;
    }

    .nav-links {
        display: flex;
        gap: clamp(1rem, 2vw, 2rem);
        margin-left: clamp(1rem, 3vw, 3rem);
    }

    .nav-links a {
        color: #cdd0ed;
        font-size: 0.9rem;
        text-decoration: none;
        transition: color 0.2s ease, text-shadow 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.is-active {
        color: #fff;
        text-shadow: 0 0 12px var(--blue);
    }

    .nav-cta {
        margin-left: auto;
    }

    .nav-cta.btn {
        min-height: 40px;
        padding: 0.5rem 1.1rem;
        font-size: 0.88rem;
    }

    .hero {
        grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
        gap: clamp(1.5rem, 4vw, 4rem);
        min-height: min(760px, 92vh);
        padding-block: clamp(3.5rem, 8vw, 6rem);
    }

    .hero-card {
        align-self: end;
        transform: rotate(-4deg);
        animation: float 5s ease-in-out infinite;
    }

    .hero__ring {
        display: block;
        position: absolute;
        top: 6%;
        right: -8%;
        width: clamp(320px, 34vw, 520px);
        aspect-ratio: 1 / 1;
        border: 1px solid rgba(141, 92, 255, 0.28);
        border-radius: 50%;
        box-shadow: 0 0 70px rgba(122, 73, 255, 0.2), inset 0 0 70px rgba(122, 73, 255, 0.1);
        animation: rotate 24s linear infinite;
        pointer-events: none;
    }

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

    .hero-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.9rem;
    }

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

    .steps li {
        grid-template-columns: 40px 1fr;
    }
}

@media (min-width: 1100px) {
    .hero-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
    }
}

@keyframes rotate {
    to {
        transform: rotate(360deg);
    }
}

@keyframes float {
    50% {
        transform: rotate(-4deg) translateY(-12px);
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }

    .js-reveal .reveal {
        opacity: 1;
        transform: none;
    }
}