.page-header {
    padding: 52px 0 44px;
    border-bottom: 1px solid var(--border);
}

.page-kicker {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.page-kicker::before { content: ''; display: block; width: 24px; height: 1px; background: var(--accent); }

.page-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-weight: 800;
    font-size: clamp(2.6rem, 6vw, 5rem);
    line-height: 0.92;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.page-desc {
    font-size: 0.92rem;
    color: var(--text-2);
    max-width: 520px;
    line-height: 1.75;
}

.content { padding: 60px 0; }

.before-begin { margin-bottom: 56px; }

.notice {
    background: var(--warn-dim);
    border: 1px solid rgba(245,158,11,0.2);
    border-left: 3px solid var(--warn);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 16px;
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.notice-icon { color: var(--warn); flex-shrink: 0; margin-top: 2px; }
.notice p { font-size: 0.9rem; color: var(--text-2); line-height: 1.7; }
.notice strong { color: var(--text); font-weight: 500; }

.prereq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 10px;
    margin-top: 24px;
}

.prereq-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
}

.prereq-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex-shrink: 0; margin-top: 8px; }
.prereq-item p { font-size: 0.88rem; color: var(--text-2); line-height: 1.65; }
.prereq-item strong { color: var(--text); font-weight: 500; }

.video-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 48px;
}

.video-banner-label {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.72rem;
    color: var(--text-2);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.video-banner-link {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.72rem;
    color: var(--text-3);
    letter-spacing: 0.06em;
    text-decoration: none;
    padding: 5px 14px;
    border: 1px solid var(--border-2);
    border-radius: 50px;
    transition: all 0.2s var(--ease);
    white-space: nowrap;
}

.video-banner-link:hover { color: var(--accent); border-color: var(--accent); }

.step { margin-bottom: 56px; padding-bottom: 56px; border-bottom: 1px solid var(--border); }
.step:last-of-type { border-bottom: none; margin-bottom: 0; }

.step-head { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; }

.step-num {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--bg);
    background: var(--accent);
    padding: 4px 12px;
    border-radius: 4px;
    flex-shrink: 0;
}

.step-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.01em;
    line-height: 1;
}

.platform-tabs {
    display: flex;
    border: 1px solid var(--border);
    border-bottom: none;
    border-radius: var(--radius) var(--radius) 0 0;
    overflow: hidden;
    width: fit-content;
}

.ptab-btn {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 9px 18px;
    background: transparent;
    border: none;
    border-right: 1px solid var(--border);
    color: var(--text-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 7px;
    transition: all 0.2s var(--ease);
    white-space: nowrap;
}

.ptab-btn:last-child { border-right: none; }
.ptab-btn:hover { color: var(--text); background: var(--surface-2); }
.ptab-btn.active { color: var(--bg); background: var(--accent); }

.ptab-panels {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0 var(--radius) var(--radius) var(--radius);
    padding: 28px;
}

.ptab-content { display: none; }
.ptab-content.active { display: block; }

.ptab-content h4 {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 16px;
}

.ptab-content p { font-size: 0.9rem; color: var(--text-2); line-height: 1.75; margin-bottom: 14px; }
.ptab-content p:last-child { margin-bottom: 0; }
.ptab-content a { color: var(--accent); text-decoration: none; }
.ptab-content a:hover { text-decoration: underline; }

.step-sub {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.68rem;
    color: var(--text-2);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin: 20px 0 10px;
    display: block;
}

.code-block {
    position: relative;
    background: #0d0d10;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 56px 14px 16px;
    margin: 10px 0;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Azeret Mono', monospace;
    font-size: 0.85rem;
    color: var(--success);
    background: transparent;
    border: none;
    padding: 0;
    white-space: pre;
    display: block;
}

.copy-btn {
    position: absolute;
    top: 9px; right: 9px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-2);
    padding: 4px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Azeret Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.06em;
    transition: all 0.2s var(--ease);
}

.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: var(--success); border-color: var(--success); }

.inline-note {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    background: var(--info-dim);
    border: 1px solid rgba(59,130,246,0.18);
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 12px;
}

.inline-note svg { flex-shrink: 0; color: var(--info); margin-top: 2px; }
.inline-note p { font-size: 0.86rem; color: var(--text-2); margin-bottom: 0 !important; line-height: 1.65; }

.warn-note {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    background: var(--warn-dim);
    border: 1px solid rgba(245,158,11,0.18);
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 12px;
}

.warn-note svg { flex-shrink: 0; color: var(--warn); margin-top: 2px; }
.warn-note p { font-size: 0.86rem; color: var(--text-2); margin-bottom: 0 !important; line-height: 1.65; }
.warn-note strong { color: var(--text); font-weight: 500; }

.body-text { font-size: 0.9rem; color: var(--text-2); line-height: 1.75; margin-bottom: 14px; }
.body-text strong { color: var(--text); font-weight: 500; }

.errors { padding: 56px 0 0; }

.error-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 10px;
}

.error-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--danger);
    border-radius: var(--radius);
    padding: 20px;
}

.error-title {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--danger);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.error-card p { font-size: 0.88rem; color: var(--text-2); line-height: 1.65; }

footer { margin-top: 72px; }

@media (max-width: 640px) {
    .page-header { padding: 36px 0 32px; }
    .content { padding: 40px 0; }
    .step { margin-bottom: 40px; padding-bottom: 40px; }
    .prereq-grid, .error-grid { grid-template-columns: 1fr; }
    .platform-tabs { width: 100%; }
    .ptab-btn { flex: 1; justify-content: center; font-size: 0.62rem; padding: 8px 10px; }
    .ptab-panels { border-radius: 0 0 var(--radius) var(--radius); }
    .video-banner { flex-direction: column; align-items: flex-start; gap: 10px; }
}