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

:root{
    --bg:#f7f3ec;
    --paper:#fffaf5;
    --card:#ffffff;
    --text:#251f1a;
    --muted:#746a62;
    --line:rgba(37,31,26,0.12);
    --accent:#7c5cff;
    --accent-dark:#5b3ee6;
    --accent-soft:#efeaff;
    --warm:#ff8a2a;
    --dark:#15110f;
    --dark-card:#211b18;
    --shadow:0 22px 60px rgba(37,31,26,0.10);
}

html{
    scroll-behavior:smooth;
}

body{
    font-family:Arial, Helvetica, sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.6;
}

button,
input,
textarea,
select{
    font:inherit;
}

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

.container{
    width:min(1120px, calc(100% - 40px));
    margin:0 auto;
}

.guide-header{
    position:sticky;
    top:0;
    z-index:50;
    background:rgba(247,243,236,0.9);
    backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
}

.guide-header-inner{
    width:min(1180px, calc(100% - 40px));
    min-height:74px;
    margin:0 auto;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:24px;
}

.back-link{
    display:inline-flex;
    align-items:center;
    min-height:42px;
    padding:0 16px;
    border-radius:999px;
    background:#fff;
    border:1px solid var(--line);
    font-weight:700;
    color:var(--text);
}

.quick-nav{
    display:flex;
    align-items:center;
    gap:22px;
    color:#756b63;
    font-size:15px;
    white-space:nowrap;
}

.quick-nav a{
    padding:8px 0;
    transition:color .2s ease;
}

.quick-nav a:hover{
    color:var(--accent-dark);
}

.hero{
    padding:92px 0 78px;
    background:
        radial-gradient(circle at 12% 18%, rgba(124,92,255,0.17), transparent 30%),
        radial-gradient(circle at 86% 18%, rgba(255,138,42,0.14), transparent 28%),
        linear-gradient(135deg, #fbf7ef, #efe8dd);
    border-bottom:1px solid var(--line);
}

.hero-grid{
    display:grid;
    grid-template-columns:minmax(0, 1.15fr) minmax(320px, 0.85fr);
    gap:44px;
    align-items:center;
}

.eyebrow,
.section-kicker{
    color:var(--accent-dark);
    font-size:17px;
    font-weight:700;
    margin-bottom:12px;
}

.hero-copy h1{
    max-width:720px;
    font-size:clamp(52px, 8vw, 92px);
    line-height:0.96;
    margin-bottom:24px;
}

.hero-copy p{
    max-width:700px;
    color:var(--muted);
    font-size:18px;
}

.hero-actions{
    display:flex;
    flex-wrap:wrap;
    gap:14px;
    margin-top:30px;
}

.btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:48px;
    padding:0 22px;
    border-radius:999px;
    font-weight:700;
    transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

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

.btn-primary{
    background:var(--dark);
    color:#fff;
    box-shadow:0 16px 34px rgba(21,17,15,0.18);
}

.btn-secondary{
    background:rgba(255,255,255,0.72);
    border:1px solid var(--line);
}

.spec-panel{
    background:rgba(255,250,245,0.88);
    border:1px solid rgba(255,255,255,0.76);
    border-radius:30px;
    padding:30px;
    box-shadow:var(--shadow);
}

.spec-panel h2{
    font-size:26px;
    margin-bottom:18px;
}

.spec-panel ul{
    display:grid;
    gap:12px;
    list-style:none;
}

.spec-panel li{
    display:flex;
    justify-content:space-between;
    gap:16px;
    padding-bottom:12px;
    border-bottom:1px solid var(--line);
    color:var(--muted);
}

.spec-panel li:last-child{
    border-bottom:none;
    padding-bottom:0;
}

.spec-panel strong{
    color:var(--text);
}

.section{
    padding:82px 0;
}

.section-head{
    text-align:center;
    margin-bottom:34px;
}

.section-head h2,
.section-intro h2{
    font-size:clamp(32px, 4.6vw, 56px);
    line-height:1.05;
    margin-bottom:14px;
}

.section-head p,
.section-intro p{
    max-width:720px;
    color:var(--muted);
    font-size:17px;
}

.section-head p{
    margin:0 auto;
}

.step-grid{
    display:grid;
    grid-template-columns:repeat(5, minmax(0, 1fr));
    gap:16px;
}

.step-card{
    min-height:315px;
    display:flex;
    flex-direction:column;
    justify-content:flex-start;
    gap:20px;
    background:#fff;
    border:1px solid var(--line);
    border-radius:26px;
    padding:26px;
    box-shadow:0 18px 45px rgba(37,31,26,0.06);
}

.step-card span{
    color:var(--accent-dark);
    font-size:22px;
    font-weight:700;
}

.step-card h3{
    font-size:24px;
    line-height:1.16;
}

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

.video-section{
    background:#fff8ee;
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
}

.video-grid{
    display:grid;
    grid-template-columns:repeat(3, minmax(0, 1fr));
    gap:20px;
}

.video-card{
    min-height:240px;
    display:flex;
    flex-direction:column;
    justify-content:space-between;
    gap:22px;
    padding:28px;
    border-radius:28px;
    background:#fff;
    border:1px solid var(--line);
    box-shadow:0 18px 45px rgba(37,31,26,0.06);
}

.video-card h3{
    font-size:24px;
    line-height:1.18;
    margin-bottom:10px;
}

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

.video-card a,
.inline-video,
.web-links a{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    width:max-content;
    min-height:42px;
    padding:0 16px;
    border-radius:999px;
    background:var(--accent-soft);
    color:var(--accent-dark);
    font-weight:700;
}

.dark-section{
    background:var(--dark);
    color:#fff;
}

.dark-section .section-kicker{
    color:#b6a6ff;
}

.dark-section p,
.dark-section li{
    color:rgba(255,255,255,0.72);
}

.split-layout{
    display:grid;
    grid-template-columns:minmax(280px, 0.82fr) minmax(0, 1.18fr);
    gap:42px;
    align-items:start;
}

.note-box{
    margin-top:24px;
    padding:20px;
    border-radius:22px;
    background:rgba(124,92,255,0.12);
    border:1px solid rgba(124,92,255,0.28);
    color:inherit;
}

.dark-section .note-box{
    background:rgba(255,255,255,0.08);
    border-color:rgba(255,255,255,0.14);
    color:rgba(255,255,255,0.8);
}

.instruction-card,
.power-card,
.support-panel{
    padding:30px;
    border-radius:30px;
    background:#fff;
    border:1px solid var(--line);
    box-shadow:var(--shadow);
    color:var(--text);
}

.dark-section .instruction-card{
    background:var(--dark-card);
    border-color:rgba(255,255,255,0.12);
    box-shadow:none;
    color:#fff;
}

.instruction-card ol,
.power-card ul,
.support-block ul{
    padding-left:22px;
}

.instruction-card li + li,
.power-card li + li,
.support-block li + li{
    margin-top:12px;
}

.instruction-card strong{
    color:inherit;
}

.inline-video{
    margin-top:24px;
}

.web-links{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    margin-top:24px;
}

.setting-grid{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));
    gap:18px;
}

.setting-card{
    min-height:170px;
    padding:26px;
    border-radius:26px;
    background:#fff;
    border:1px solid var(--line);
    box-shadow:0 18px 45px rgba(37,31,26,0.06);
}

.setting-card h3{
    color:var(--accent-dark);
    font-size:22px;
    margin-bottom:10px;
}

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

.wide-card{
    grid-column:1 / -1;
}

.soft-section{
    background:#f0eaff;
    border-top:1px solid rgba(124,92,255,0.16);
    border-bottom:1px solid rgba(124,92,255,0.16);
}

.safety-grid{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));
    gap:16px;
}

.safety-grid article{
    min-height:118px;
    display:flex;
    align-items:center;
    padding:22px;
    border-radius:24px;
    background:#fff;
    border:1px solid rgba(124,92,255,0.14);
    color:#5d544d;
    font-weight:700;
}

.power-card h3{
    color:var(--accent-dark);
    font-size:24px;
    margin-bottom:16px;
}

.accordion-list{
    display:grid;
    gap:14px;
    max-width:920px;
}

.guide-accordion{
    border-radius:22px;
    background:rgba(255,255,255,0.08);
    border:1px solid rgba(255,255,255,0.13);
    overflow:hidden;
}

.guide-accordion summary{
    cursor:pointer;
    list-style:none;
    padding:22px 24px;
    color:#fff;
    font-size:18px;
    font-weight:700;
}

.guide-accordion summary::-webkit-details-marker{
    display:none;
}

.guide-accordion summary::after{
    content:"+";
    float:right;
    color:#b6a6ff;
}

.guide-accordion[open] summary::after{
    content:"–";
}

.guide-accordion p{
    padding:0 24px 22px;
    color:rgba(255,255,255,0.74);
}

.help-section{
    background:#fffaf2;
}

.support-panel{
    display:grid;
    grid-template-columns:repeat(2, minmax(0, 1fr));
    gap:24px;
}

.support-block h3{
    color:var(--accent-dark);
    font-size:24px;
    margin-bottom:14px;
}

.support-block li{
    color:var(--muted);
}

.support-block .btn{
    margin-top:22px;
}

.footer{
    background:#130f0c;
    color:#fff;
    padding:36px 0;
}

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

.footer h3{
    margin-bottom:8px;
}

.footer p,
.footer a{
    color:rgba(255,255,255,0.72);
}

@media (max-width:1080px){
    .step-grid{
        grid-template-columns:repeat(3, minmax(0, 1fr));
    }
}

@media (max-width:900px){
    .guide-header-inner{
        min-height:auto;
        padding:16px 0;
        flex-direction:column;
        align-items:flex-start;
        gap:12px;
    }

    .quick-nav{
        width:100%;
        overflow-x:auto;
        gap:18px;
        padding-bottom:4px;
    }

    .hero-grid,
    .split-layout{
        grid-template-columns:1fr;
    }

    .step-grid,
    .video-grid,
    .setting-grid,
    .safety-grid,
    .support-panel{
        grid-template-columns:1fr;
    }

    .hero{
        padding:58px 0 54px;
    }

    .section{
        padding:62px 0;
    }
}

@media (max-width:560px){
    .container,
    .guide-header-inner{
        width:min(100% - 28px, 1120px);
    }

    .hero-copy h1{
        font-size:52px;
    }

    .step-card,
    .video-card,
    .instruction-card,
    .power-card,
    .support-panel,
    .spec-panel{
        border-radius:24px;
        padding:22px;
    }

    .footer-inner{
        flex-direction:column;
    }
}