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

body {
    font-family: 'Inter', sans-serif;
    background: #f5f5f7;
    color: #1d1d1f;
    min-height: 100vh;
}

/* ── Header ── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(245, 245, 247, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding: 0 32px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-left img { height: 26px; }

.header-title {
    font-size: 13px;
    font-weight: 500;
    color: rgba(0, 0, 0, 0.45);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.header-sep {
    width: 1px;
    height: 18px;
    background: rgba(0, 0, 0, 0.15);
}

.back-link {
    font-size: 13px;
    color: rgba(0, 0, 0, 0.45);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: color 0.15s;
}

.back-link:hover { color: rgba(0, 0, 0, 0.75); }

/* ── Layout ── */
.layout {
    display: flex;
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px 80px;
    gap: 40px;
}

/* ── Sidebar ── */
.sidebar {
    width: 200px;
    flex-shrink: 0;
}

.sidebar-inner {
    position: sticky;
    top: 76px;
}

.sidebar-label {
    font-size: 10px;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.35);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 10px;
    padding-left: 10px;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-list a {
    display: block;
    padding: 7px 10px;
    border-radius: 8px;
    font-size: 14px;
    color: rgba(0, 0, 0, 0.55);
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}

 /* ── Content ── */
.content {
    flex: 1;
    min-width: 0;
}

.section {
    margin-bottom: 64px;
    scroll-margin-top: 76px;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.section-number {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.07);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
    color: rgba(0, 0, 0, 0.45);
    flex-shrink: 0;
}

.section h2 {
    font-size: 20px;
    font-weight: 600;
    color: #1d1d1f;
}

.section p {
    font-size: 15px;
    line-height: 1.75;
    color: rgba(0, 0, 0, 0.65);
    margin-bottom: 16px;
}

.section p:last-child { margin-bottom: 0; }

.section strong { color: rgba(0, 0, 0, 0.82); }

/* ── Images ── */
.img-wrap {
    margin: 24px 0;
    text-align: center;
}

.img-wrap img {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.05);
}

/* ── Hotkeys ── */
.hotkeys-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin: 20px 0;
}

.hotkey-entry {
    display: flex;
    align-items: center;
    gap: 16px;
}

.hotkey-entry img {
    height: 28px;
    object-fit: contain;
    flex-shrink: 0;
}

.hotkey-entry span {
    font-size: 15px;
    color: rgba(0, 0, 0, 0.65);
}

/* ── Feature / item lists ── */
.features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.features-list li {
    font-size: 15px;
    color: rgba(0, 0, 0, 0.65);
    line-height: 1.5;
    padding-left: 20px;
    position: relative;
}

.features-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: rgba(0, 0, 0, 0.25);
}

/* ── Footer ── */
.guide-footer {
    text-align: center;
    padding: 32px;
    font-size: 12px;
    color: rgba(0, 0, 0, 0.3);
    border-top: 1px solid rgba(0, 0, 0, 0.07);
}

.guide-footer a { color: inherit; }

/* ── Mobile ── */
@media (max-width: 720px) {
    .sidebar { display: none; }
    .layout { padding: 24px 16px 60px; }
    .site-header { padding: 0 16px; }
    .img-wrap img { max-width: 100% !important; }
}

 .features-list--intro {
     margin-bottom: 16px;
 }

 .img-small {
     max-width: 320px;
 }

 .img-wrap--footer {
     margin-top: 40px;
 }

 .img-logo {
     height: 40px;
     box-shadow: none;
     border-radius: 0;
 }