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

:root{
    --bg:#f7f3ec;
    --paper:#fffaf2;
    --card:#ffffff;
    --text:#2a241f;
    --muted:#766d66;
    --line:rgba(42,36,31,0.12);
    --accent:#ff7a1a;
    --accent-dark:#d95e00;
    --dark:#16110d;
    --dark-card:#251c16;
    --shadow:0 22px 60px rgba(42,36,31,0.10);
}

html{
    scroll-behavior:smooth;
}

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

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

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

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

.guide-header{
    position:sticky;
    top:0;
    z-index:30;
    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:22px;
}

.back-link{
    font-weight:700;
    color:var(--text);
}

.quick-nav{
    display:flex;
    align-items:center;
    gap:22px;
    color:var(--muted);
    font-size:15px;
}

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

.hero{
    padding:92px 0 78px;
    border-bottom:1px solid var(--line);
    background:
        radial-gradient(circle at 12% 22%, rgba(255,122,26,0.16), transparent 28%),
        radial-gradient(circle at 82% 18%, rgba(42,36,31,0.10), transparent 28%),
        linear-gradient(135deg, #fbf6ee, #eee5d9);
}

.hero-grid{
    display:grid;
    grid-template-columns:minmax(0, 1.1fr) minmax(300px, 0.9fr);
    gap:44px;
    align-items:center;
}

.eyebrow,
.section-kicker{
    color:var(--accent-dark);
    font-size:17px;
    font-weight:700;
    margin-bottom:14px;
}

.hero-copy h1{
    font-size:clamp(58px, 10vw, 116px);
    line-height:0.92;
    margin-bottom:24px;
}

.hero-copy p{
    max-width:680px;
    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;
}

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

.btn-primary{
    background:var(--dark);
    color:#fff;
    box-shadow:0 16px 34px rgba(22,17,13,0.18);
}

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

.spec-panel{
    background:rgba(255,250,242,0.9);
    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{
    list-style:none;
    display:grid;
    gap:12px;
}

.spec-panel li{
    padding:14px 16px;
    border-radius:16px;
    background:#fff;
    border:1px solid var(--line);
    color:var(--muted);
}

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

.section{
    padding:82px 0;
}

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

.section-head h2,
.section-intro h2,
.help-card h2{
    font-size:clamp(30px, 4vw, 48px);
    line-height:1.08;
    margin-bottom:12px;
}

.section-head p,
.section-intro p,
.help-card p{
    max-width:700px;
    color:var(--muted);
}

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

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

.step-card,
.info-card,
.video-card{
    background:#fff;
    border:1px solid var(--line);
    border-radius:26px;
    padding:24px;
    box-shadow:0 16px 44px rgba(42,36,31,0.06);
}

.step-card span{
    display:inline-block;
    color:var(--accent-dark);
    font-size:18px;
    font-weight:700;
    margin-bottom:28px;
}

.step-card h3,
.info-card h3,
.video-card h3{
    font-size:22px;
    line-height:1.2;
    margin-bottom:12px;
}

.step-card p,
.info-card li,
.video-card p{
    color:var(--muted);
}

.video-section,
.soft-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 a,
.inline-video{
    display:inline-flex;
    margin-top:18px;
    color:var(--accent-dark);
    font-weight:700;
}

.split-layout{
    display:grid;
    grid-template-columns:minmax(260px, 0.82fr) minmax(0, 1.18fr);
    gap:42px;
    align-items:start;
}

.reverse-layout{
    grid-template-columns:minmax(0, 1.18fr) minmax(260px, 0.82fr);
}

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

.info-card ul{
    padding-left:20px;
}

.info-card li + li{
    margin-top:8px;
}

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

.dark-section .section-kicker{
    color:#ffb06e;
}

.dark-section .section-intro p,
.dark-section .section-head p,
.dark-section .dark-head p{
    color:rgba(255,255,255,0.7);
}

.note-box{
    margin-top:20px;
    padding:18px;
    border-radius:20px;
    background:rgba(255,122,26,0.14);
    border:1px solid rgba(255,122,26,0.22);
    color:#ffd1ae;
}

.instruction-card{
    background:rgba(255,255,255,0.08);
    border:1px solid rgba(255,255,255,0.12);
    border-radius:28px;
    padding:28px;
}

.instruction-card ol{
    padding-left:22px;
    color:rgba(255,255,255,0.78);
}

.instruction-card li + li{
    margin-top:12px;
}

.instruction-card strong{
    color:#fff;
}

.light-card{
    background:#fff;
    border:1px solid var(--line);
}

.light-card ol{
    color:var(--muted);
}

.settings-panel{
    display:grid;
    gap:14px;
}

.settings-panel div{
    background:#fff;
    border:1px solid var(--line);
    border-radius:22px;
    padding:22px;
}

.settings-panel span{
    display:block;
    color:var(--accent-dark);
    font-weight:700;
    margin-bottom:8px;
}

.settings-panel strong{
    font-size:18px;
    line-height:1.35;
}

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

.tips-grid article{
    min-height:130px;
    display:flex;
    align-items:flex-end;
    padding:22px;
    border-radius:24px;
    background:#fff;
    border:1px solid var(--line);
    color:var(--muted);
    font-weight:700;
}

.dark-head h2{
    color:#fff;
}

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

.guide-accordion{
    background:var(--dark-card);
    border:1px solid rgba(255,255,255,0.12);
    border-radius:22px;
    overflow:hidden;
}

.guide-accordion summary{
    cursor:pointer;
    list-style:none;
    padding:22px 24px;
    font-size:20px;
    font-weight:700;
}

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

.guide-accordion p{
    padding:0 24px 24px;
    color:rgba(255,255,255,0.72);
}

.safety-list{
    display:grid;
    gap:12px;
}

.safety-list p{
    background:#fff;
    border:1px solid var(--line);
    border-radius:18px;
    padding:18px 20px;
    color:var(--muted);
}

.help-section{
    background:#fff8ee;
}

.help-card{
    background:#fff;
    border:1px solid var(--line);
    border-radius:30px;
    padding:34px;
    box-shadow:var(--shadow);
}

.help-card ul{
    margin:16px 0 24px;
    padding-left:22px;
    color:var(--muted);
}

.help-card li + li{
    margin-top:8px;
}

.footer{
    background:#130f0c;
    color:#fff;
    padding:34px 0;
}

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

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

@media (max-width:1060px){
    .step-grid{
        grid-template-columns:repeat(2, minmax(0, 1fr));
    }
}

@media (max-width:900px){
    .guide-header-inner{
        min-height:auto;
        padding:18px 0;
        flex-direction:column;
        align-items:flex-start;
    }

    .quick-nav{
        width:100%;
        overflow-x:auto;
        white-space:nowrap;
        padding-bottom:4px;
    }

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

    .video-grid,
    .power-grid,
    .tips-grid{
        grid-template-columns:1fr;
    }

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

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

    .hero-copy h1{
        font-size:56px;
    }

    .step-grid{
        grid-template-columns:1fr;
    }

    .section{
        padding:62px 0;
    }

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