/* ============================================
   Modern HTML Template for StepShot Guides
   Responsive, accessible, light + dark mode
   Accordion layout (single-open by default)
   ============================================ */

:root {
    --brand: #cf3918;
    --brand-soft: #f9e6e0;
    --brand-deep: #a82d12;

    --bg: #faf8f6;
    --bg-elevated: #ffffff;
    --bg-muted: #f3efea;
    --surface: #ffffff;
    --border: #e8e2dc;
    --border-strong: #d6cec5;
    --text: #1a1614;
    --text-muted: #6b625a;
    --text-soft: #8a8077;

    --shadow-sm: 0 1px 2px rgba(20, 12, 8, 0.04), 0 1px 1px rgba(20, 12, 8, 0.03);
    --shadow-md: 0 4px 16px rgba(20, 12, 8, 0.06), 0 2px 4px rgba(20, 12, 8, 0.04);
    --shadow-lg: 0 16px 48px rgba(20, 12, 8, 0.10), 0 4px 12px rgba(20, 12, 8, 0.06);
    --shadow-xl: 0 32px 80px rgba(20, 12, 8, 0.18);

    --sidebar-w: 320px;
    --content-max: 800px;
    --img-max-h: 320px;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 32px;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
    --font-display: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --duration: 320ms;
}

[data-theme="dark"] {
    --bg: #14110f;
    --bg-elevated: #1c1816;
    --bg-muted: #221d1a;
    --surface: #1c1816;
    --border: #2a2421;
    --border-strong: #3a322e;
    --text: #f5efe8;
    --text-muted: #a89f95;
    --text-soft: #7a7268;
    --brand-soft: #3a1810;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.30);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35), 0 2px 4px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
    --shadow-xl: 0 32px 80px rgba(0, 0, 0, 0.55);
}

html { scroll-behavior: smooth; scroll-padding-top: 16px; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.65;
    min-height: 100vh;
    transition: background var(--duration) var(--ease), color var(--duration) var(--ease);
    -webkit-font-feature-settings: "ss01", "cv11";
    font-feature-settings: "ss01", "cv11";
}

/* Reading progress bar */
.reading-progress {
    position: fixed; top: 0; left: 0; right: 0; height: 3px;
    z-index: 100; pointer-events: none;
}
.reading-progress-fill {
    height: 100%; width: 0;
    background: linear-gradient(90deg, var(--brand) 0%, var(--brand-deep) 100%);
    transition: width 80ms linear;
    box-shadow: 0 0 12px rgba(207, 57, 24, 0.4);
}

/* Theme + menu toggles */
.theme-toggle, .menu-toggle {
    position: fixed; top: 18px; width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    z-index: 80;
    display: flex; align-items: center; justify-content: center;
    transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
    color: var(--text);
}
.theme-toggle { right: 18px; }
.menu-toggle { left: 18px; display: none; flex-direction: column; gap: 4px; padding: 0 12px; }
.theme-toggle:hover, .menu-toggle:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.theme-toggle svg { width: 20px; height: 20px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.menu-toggle span {
    display: block; width: 18px; height: 2px;
    background: var(--text); border-radius: 1px;
    transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}
.menu-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
    position: fixed; top: 0; left: 0;
    width: var(--sidebar-w); height: 100vh;
    background: var(--bg-elevated);
    border-right: 1px solid var(--border);
    z-index: 60;
    overflow-y: auto;
    overscroll-behavior: contain;
    transition: transform var(--duration) var(--ease);
    scrollbar-width: thin;
    scrollbar-color: var(--border-strong) transparent;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
.sidebar-inner { display: flex; flex-direction: column; min-height: 100%; padding: 32px 24px 24px; }

.sidebar-brand {
    display: flex; align-items: flex-start; gap: 14px;
    margin-bottom: 24px; padding-bottom: 22px;
    border-bottom: 1px solid var(--border);
}
.brand-mark {
    flex-shrink: 0; width: 40px; height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
    box-shadow: 0 4px 14px rgba(207, 57, 24, 0.30);
    position: relative; overflow: hidden;
}
.brand-mark::before {
    content: ""; position: absolute; inset: 6px;
    border: 2px solid rgba(255,255,255,0.6);
    border-radius: 6px;
}
.brand-mark::after {
    content: ""; position: absolute; top: 14px; left: 12px;
    width: 16px; height: 2px;
    background: rgba(255,255,255,0.9);
    box-shadow: 0 5px 0 rgba(255,255,255,0.9), 0 10px 0 rgba(255,255,255,0.55);
    border-radius: 1px;
}
.brand-eyebrow {
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em;
    font-weight: 600; color: var(--text-soft); margin-bottom: 2px;
}
.brand-title {
    font-size: 15px; font-weight: 700; color: var(--text); line-height: 1.3;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    overflow: hidden;
}

.sidebar-search { position: relative; margin-bottom: 22px; }
.sidebar-search svg {
    position: absolute; top: 50%; left: 14px; transform: translateY(-50%);
    width: 16px; height: 16px; color: var(--text-soft); pointer-events: none;
}
.sidebar-search input {
    width: 100%; padding: 11px 14px 11px 40px;
    background: var(--bg-muted);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: 14px; color: var(--text);
    transition: border-color 200ms var(--ease), background 200ms var(--ease);
}
.sidebar-search input::placeholder { color: var(--text-soft); }
.sidebar-search input:focus {
    outline: none;
    border-color: var(--brand);
    background: var(--surface);
    box-shadow: 0 0 0 3px var(--brand-soft);
}

.toc { flex: 1; margin-bottom: 20px; }
.toc-label {
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.10em;
    font-weight: 700; color: var(--text-soft);
    margin-bottom: 12px; padding: 0 12px;
}
.toc-list { display: flex; flex-direction: column; gap: 4px; }
.toc-item { position: relative; }
.toc-item.is-hidden, .toc-section.is-hidden { display: none; }
.toc-link {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 12px; border-radius: 10px;
    font-size: 14px; color: var(--text-muted); line-height: 1.4;
    transition: background 160ms var(--ease), color 160ms var(--ease);
    cursor: pointer; border: 1px solid transparent;
    background: transparent;
    width: 100%;
    text-align: left;
}
.toc-link:hover { background: var(--bg-muted); color: var(--text); }
.toc-link.is-active {
    background: var(--brand-soft); color: var(--brand-deep); font-weight: 600;
}
[data-theme="dark"] .toc-link.is-active { color: #f5b8a0; }
.toc-link-bullet {
    flex-shrink: 0; width: 6px; height: 6px;
    border-radius: 50%; background: currentColor; opacity: 0.5;
}

/* Section header in TOC (clickable, with chevron) */
.toc-section-header {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 12px; border-radius: 10px;
    font-size: 12px; font-weight: 700;
    color: var(--text);
    text-transform: uppercase; letter-spacing: 0.05em;
    line-height: 1.3;
    transition: background 160ms var(--ease), color 160ms var(--ease);
    cursor: pointer;
    width: 100%; text-align: left;
    background: transparent;
    border: 1px solid transparent;
}
.toc-section-header:hover { background: var(--bg-muted); }
.toc-section-header.is-expanded {
    background: var(--brand-soft);
    color: var(--brand-deep);
}
[data-theme="dark"] .toc-section-header.is-expanded { color: #f5b8a0; }
.toc-section-num {
    flex-shrink: 0;
    width: 22px; height: 22px;
    border-radius: 6px;
    background: var(--bg-muted);
    color: var(--text-muted);
    display: flex; align-items: center; justify-content: center;
    font-size: 11px; font-weight: 700;
    font-family: var(--font-display);
    transition: background 160ms var(--ease), color 160ms var(--ease);
}
.toc-section-header.is-expanded .toc-section-num {
    background: var(--brand);
    color: white;
}
.toc-section-label {
    flex: 1; min-width: 0;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.toc-section-chevron {
    flex-shrink: 0;
    width: 16px; height: 16px;
    color: var(--text-soft);
    transition: transform 280ms var(--ease), color 160ms var(--ease);
    display: flex; align-items: center; justify-content: center;
}
.toc-section-chevron svg { width: 12px; height: 12px; }
.toc-section-header.is-expanded .toc-section-chevron {
    transform: rotate(180deg);
    color: currentColor;
}

/* Sublist of step links inside a TOC section */
.toc-sublist {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 320ms var(--ease);
    margin: 2px 0 0 0;
}
.toc-section.is-expanded .toc-sublist {
    grid-template-rows: 1fr;
}
.toc-sublist-inner {
    overflow: hidden; min-height: 0;
    display: flex; flex-direction: column;
    gap: 1px;
    padding: 4px 0 6px 8px;
    border-left: 1.5px dashed var(--border);
    margin-left: 22px;
}
.toc-sublist .toc-link {
    padding: 6px 10px;
    font-size: 13px;
    border-radius: 8px;
}
.toc-sublist .toc-link-text {
    flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.toc-link-text { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.sidebar-footer { padding-top: 18px; border-top: 1px solid var(--border); }
.sidebar-actions { display: flex; gap: 6px; margin-bottom: 16px; }
.sidebar-action {
    flex: 1; padding: 8px 10px;
    background: var(--bg-muted);
    border: 1px solid transparent;
    border-radius: 8px;
    font-size: 12px; font-weight: 600;
    color: var(--text-muted);
    transition: background 160ms var(--ease), color 160ms var(--ease);
}
.sidebar-action:hover {
    background: var(--brand-soft); color: var(--brand-deep);
}
[data-theme="dark"] .sidebar-action:hover { color: #f5b8a0; }
.step-counter { display: flex; align-items: baseline; gap: 8px; padding: 0 12px; }
.step-counter strong {
    font-size: 24px; font-weight: 800; color: var(--brand); letter-spacing: -0.02em;
}
.step-counter span { font-size: 12px; color: var(--text-soft); }

/* ============================================
   Main
   ============================================ */
.main {
    margin-left: var(--sidebar-w);
    min-height: 100vh;
    display: flex; flex-direction: column;
}

/* Hero */
.hero {
    position: relative; overflow: hidden;
    padding: 96px 48px 64px;
    background: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg) 100%);
    border-bottom: 1px solid var(--border);
}
.hero-pattern {
    position: absolute; top: 0; right: 0;
    width: 60%; height: 100%;
    background:
        radial-gradient(circle at 80% 20%, var(--brand-soft) 0%, transparent 50%),
        radial-gradient(circle at 60% 80%, var(--brand-soft) 0%, transparent 60%);
    opacity: 0.5; pointer-events: none;
}
[data-theme="dark"] .hero-pattern { opacity: 0.25; }
.hero-pattern::before {
    content: ""; position: absolute; inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: radial-gradient(ellipse at top right, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at top right, black 0%, transparent 70%);
    opacity: 0.4;
}
.hero-content { position: relative; max-width: var(--content-max); margin: 0 auto; }
.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 14px 6px 10px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 13px; font-weight: 600; color: var(--text-muted);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}
.hero-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--brand);
    box-shadow: 0 0 0 3px rgba(207, 57, 24, 0.18);
    animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.9); }
}
.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 800; line-height: 1.05; letter-spacing: -0.035em;
    color: var(--text); margin-bottom: 20px;
    text-wrap: balance;
}
.hero-description {
    font-size: clamp(1.05rem, 1.6vw, 1.25rem);
    line-height: 1.55; color: var(--text-muted);
    max-width: 640px; margin-bottom: 36px;
    text-wrap: pretty;
}
.hero-meta {
    display: flex; align-items: center; justify-content: space-between;
    gap: 32px; flex-wrap: wrap;
    padding-top: 28px; border-top: 1px solid var(--border);
}
.hero-author { display: flex; align-items: center; gap: 14px; }
.author-avatar {
    width: 44px; height: 44px; border-radius: 50%;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
    display: flex; align-items: center; justify-content: center;
    color: white; font-weight: 700; font-size: 17px;
    box-shadow: 0 4px 12px rgba(207, 57, 24, 0.30);
}
.author-label {
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--text-soft); font-weight: 600; margin-bottom: 1px;
}
.author-name { font-weight: 600; font-size: 15px; color: var(--text); }
.hero-stats { display: flex; gap: 28px; }
.stat-value {
    font-family: var(--font-display);
    font-size: 24px; font-weight: 800;
    color: var(--text); letter-spacing: -0.02em; line-height: 1;
}
.stat-label {
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--text-soft); font-weight: 600; margin-top: 4px;
}

/* ============================================
   Accordion sections
   ============================================ */
.content {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 48px 36px 64px;
    width: 100%;
    display: flex; flex-direction: column;
    gap: 14px;
    /* Ensure the last accordion can scroll its header to the top of the
       viewport even when its content is short. */
    min-height: calc(100vh - 200px);
}

.accordion {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease);
    scroll-margin-top: 16px;
}
.accordion.is-open {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}
.accordion.is-hidden { display: none; }

.accordion-trigger {
    width: 100%;
    display: flex; align-items: center; justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    background: transparent;
    text-align: left; color: var(--text);
    transition: background 200ms var(--ease);
}
.accordion-trigger:hover { background: var(--bg-muted); }
.accordion-trigger:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: -2px;
}
.accordion-trigger-left {
    display: flex; align-items: center; gap: 16px;
    min-width: 0; flex: 1;
}
.accordion-trigger-num {
    flex-shrink: 0; width: 40px; height: 40px;
    border-radius: 12px;
    background: var(--bg-muted); color: var(--text);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 15px;
    font-family: var(--font-display); letter-spacing: -0.02em;
    transition: background 200ms var(--ease), color 200ms var(--ease), box-shadow 200ms var(--ease);
}
.accordion.is-open .accordion-trigger-num {
    background: var(--brand); color: white;
    box-shadow: 0 4px 14px rgba(207, 57, 24, 0.30);
}
.accordion-trigger-text { min-width: 0; flex: 1; }
.accordion-trigger-eyebrow {
    font-size: 11px; text-transform: uppercase; letter-spacing: 0.10em;
    color: var(--text-soft); font-weight: 700; margin-bottom: 4px;
}
.accordion.is-open .accordion-trigger-eyebrow { color: var(--brand); }
[data-theme="dark"] .accordion.is-open .accordion-trigger-eyebrow { color: #f5b8a0; }
.accordion-trigger-title {
    font-family: var(--font-display);
    font-size: 1.25rem; font-weight: 700;
    line-height: 1.3; letter-spacing: -0.018em;
    color: var(--text);
    text-wrap: balance;
}
.accordion-trigger-title .section-heading { display: inline; }
.accordion-trigger-right {
    display: flex; align-items: center; gap: 12px;
    flex-shrink: 0;
}
.accordion-count {
    font-size: 12px; font-weight: 600;
    color: var(--text-soft);
    padding: 4px 10px;
    background: var(--bg-muted);
    border-radius: 999px;
    white-space: nowrap;
}
.accordion-chevron {
    display: flex; align-items: center; justify-content: center;
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--bg-muted); color: var(--text-muted);
    transition: transform 320ms var(--ease), background 200ms var(--ease), color 200ms var(--ease);
}
.accordion-chevron svg { width: 16px; height: 16px; }
.accordion.is-open .accordion-chevron {
    transform: rotate(180deg);
    background: var(--brand-soft);
    color: var(--brand-deep);
}
[data-theme="dark"] .accordion.is-open .accordion-chevron { color: #f5b8a0; }

.accordion-panel {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 320ms var(--ease);
}
.accordion.is-open .accordion-panel { grid-template-rows: 1fr; }
/* Disable all accordion transitions for instant close (anti-flash) */
.accordion.is-no-anim,
.accordion.is-no-anim .accordion-panel,
.accordion.is-no-anim .accordion-chevron,
.accordion.is-no-anim .accordion-trigger-num,
.toc-section.is-no-anim .toc-sublist,
.toc-section.is-no-anim .toc-section-chevron,
.toc-section.is-no-anim .toc-section-num {
    transition: none !important;
}
.accordion-panel-inner {
    overflow: hidden;
    min-height: 0;
}
.accordion-panel-inner > * {
    padding-left: 24px;
    padding-right: 24px;
}
.accordion-panel-inner > *:first-child { padding-top: 8px; }
.accordion-panel-inner > *:last-child { padding-bottom: 24px; }

.accordion-description {
    font-size: 0.9375rem;
    color: var(--text-muted);
    line-height: 1.65;
    padding-top: 4px !important;
    padding-bottom: 16px !important;
    border-bottom: 1px dashed var(--border);
    margin-bottom: 8px;
}

/* ============================================
   Step card (text BEFORE image)
   ============================================ */
.step-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding-top: 18px !important;
    padding-bottom: 18px !important;
    border-top: 1px solid var(--border);
    scroll-margin-top: 24px;
}
.accordion-panel-inner > .step-card:first-child,
.accordion-description + .step-card {
    border-top: none;
    padding-top: 8px !important;
}
.step-card.is-hidden { display: none; }

.step-card-rail {
    display: flex; flex-direction: column; align-items: center;
    padding-top: 2px;
}
.step-number {
    flex-shrink: 0;
    min-width: 36px; height: 24px;
    padding: 0 9px;
    border-radius: 999px;
    background: var(--brand-soft); color: var(--brand-deep);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 12px;
    font-family: var(--font-display); letter-spacing: -0.01em;
    font-variant-numeric: tabular-nums;
    transition: background 200ms var(--ease), color 200ms var(--ease), box-shadow 200ms var(--ease);
    white-space: nowrap;
}
[data-theme="dark"] .step-number { color: #f5b8a0; }
.step-card:hover .step-number {
    background: var(--brand); color: white;
    box-shadow: 0 4px 12px rgba(207, 57, 24, 0.30);
}
.step-card-body { min-width: 0; }

.step-title {
    font-family: var(--font-display);
    font-size: 1.0625rem;
    font-weight: 700; line-height: 1.4;
    letter-spacing: -0.01em;
    color: var(--text);
    margin-bottom: 6px;
}
.step-description {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.step-description:last-child { margin-bottom: 0; }
.step-description p { margin-bottom: 0.65em; }
.step-description p:last-child { margin-bottom: 0; }
.step-description strong { color: var(--text); font-weight: 600; }
.step-description em { font-style: italic; }
.step-description a { color: var(--brand); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.step-description a:hover { color: var(--brand-deep); }
.step-description ul, .step-description ol { padding-left: 1.4em; margin: 0.5em 0; }
.step-description li { margin-bottom: 0.25em; }
.step-description code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    padding: 2px 6px;
    background: var(--bg-muted);
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* Step figure — small, centered images */
.step-figure {
    margin: 10px auto 4px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-muted);
    border: 1px solid var(--border);
    width: fit-content;
    max-width: 100%;
    display: block;
}
.step-figure-button {
    display: block; padding: 0;
    position: relative; overflow: hidden;
    background: transparent;
    cursor: zoom-in;
}
.step-figure-button img {
    display: block;
    width: auto; height: auto;
    max-width: 100%;
    max-height: var(--img-max-h);
    transition: transform 480ms var(--ease);
}
.step-figure-button:hover img { transform: scale(1.02); }
.step-figure-zoom {
    position: absolute; top: 10px; right: 10px;
    width: 32px; height: 32px;
    border-radius: 50%;
    background: rgba(20, 12, 8, 0.72);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex; align-items: center; justify-content: center;
    color: white;
    opacity: 0; transform: translateY(-4px);
    transition: opacity 200ms var(--ease), transform 200ms var(--ease);
}
.step-figure-zoom svg { width: 14px; height: 14px; }
.step-figure-button:hover .step-figure-zoom,
.step-figure-button:focus-visible .step-figure-zoom { opacity: 1; transform: translateY(0); }

/* Footer */
.footer {
    margin-top: auto;
    padding: 56px 48px;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
}
.footer-content { max-width: var(--content-max); margin: 0 auto; text-align: center; }
.footer-title {
    font-family: var(--font-display);
    font-size: 1.125rem; font-weight: 700;
    color: var(--text); margin-bottom: 4px;
}
.footer-author { font-size: 0.9375rem; color: var(--text-muted); margin-bottom: 24px; }
.footer-meta { padding-top: 24px; border-top: 1px solid var(--border); }
.footer-back-top {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 18px;
    background: transparent; border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 14px; font-weight: 600; color: var(--text-muted);
    transition: border-color 200ms var(--ease), color 200ms var(--ease), background 200ms var(--ease);
}
.footer-back-top svg { width: 14px; height: 14px; }
.footer-back-top:hover {
    border-color: var(--brand); color: var(--brand); background: var(--brand-soft);
}

/* Lightbox */
.lightbox {
    position: fixed; inset: 0;
    background: rgba(15, 10, 7, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    display: none;
    align-items: center; justify-content: center;
    padding: 32px;
    cursor: zoom-out;
}
.lightbox.is-open { display: flex; animation: fadeIn 240ms var(--ease); }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.lightbox img {
    max-width: 92vw; max-height: 88vh;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    animation: zoomIn 320ms var(--ease);
}
@keyframes zoomIn {
    from { transform: scale(0.94); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.lightbox-close {
    position: fixed;
    top: 20px;
    right: 20px;
    height: 44px;
    padding: 0 6px 0 12px;
    border-radius: 999px;
    /* Solid brand red — visible on any image (light, dark, busy) */
    background: var(--brand);
    color: white;
    border: 2.5px solid white;
    box-shadow: 0 6px 22px rgba(0, 0, 0, 0.45),
                0 2px 6px rgba(0, 0, 0, 0.35),
                0 0 0 1px rgba(0, 0, 0, 0.25);
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 14px;
    line-height: 1;
    cursor: pointer;
    transition: background 200ms var(--ease), transform 200ms var(--ease), box-shadow 200ms var(--ease);
    z-index: 210;
}
.lightbox-close:hover {
    background: var(--brand-deep);
    transform: translateY(-1px) scale(1.04);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.55),
                0 4px 10px rgba(0, 0, 0, 0.40),
                0 0 0 1px rgba(0, 0, 0, 0.30);
}
.lightbox-close:focus-visible {
    outline: 3px solid var(--brand);
    outline-offset: 2px;
}
.lightbox-close svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}
.lightbox-close-label {
    letter-spacing: 0.01em;
}
.lightbox-close-hint {
    margin-left: 2px;
    padding: 3px 7px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.04em;
    background: rgba(255, 255, 255, 0.95);
    color: var(--brand-deep);
    border: 1px solid rgba(255, 255, 255, 1);
    line-height: 1;
    text-transform: uppercase;
}

/* Tap-to-close hint at the bottom of the lightbox */
.lightbox-hint {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.92);
    color: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(255, 255, 255, 0.30);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
    pointer-events: none;
    z-index: 210;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

/* Overlay (mobile sidebar) */
.overlay {
    position: fixed; inset: 0;
    background: rgba(15, 10, 7, 0.60);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 50;
    opacity: 0; pointer-events: none;
    transition: opacity var(--duration) var(--ease);
}
.overlay.is-visible { opacity: 1; pointer-events: auto; }

/* ============================================
   Responsive — Tablet
   ============================================ */
@media (max-width: 1080px) {
    :root { --sidebar-w: 280px; --content-max: 720px; --img-max-h: 280px; }
    .hero { padding: 80px 36px 56px; }
    .content { padding: 40px 28px 28px; }
    .footer { padding: 48px 36px; }
}

/* ============================================
   Responsive — Mobile
   ============================================ */
@media (max-width: 768px) {
    :root { --content-max: 100%; --img-max-h: 220px; }
    .menu-toggle { display: flex; }
    .sidebar {
        transform: translateX(-100%);
        width: min(320px, 86vw);
        box-shadow: var(--shadow-xl);
    }
    .sidebar.is-open { transform: translateX(0); }
    .main { margin-left: 0; }
    .hero { padding: 88px 22px 44px; }
    .hero-title { font-size: clamp(2rem, 8vw, 2.75rem); }
    .hero-description { font-size: 1.0625rem; }
    .hero-meta { flex-direction: column; align-items: flex-start; gap: 24px; }
    .hero-stats { gap: 24px; width: 100%; }
    .content { padding: 28px 14px 24px; gap: 12px; }
    .accordion-trigger { padding: 16px 16px; gap: 10px; }
    .accordion-trigger-left { gap: 12px; }
    .accordion-trigger-num { width: 36px; height: 36px; font-size: 14px; border-radius: 10px; }
    .accordion-trigger-title { font-size: 1.0625rem; }
    .accordion-count { display: none; }
    .accordion-panel-inner > * { padding-left: 16px; padding-right: 16px; }
    .step-card { grid-template-columns: auto 1fr; gap: 10px; padding-top: 14px !important; padding-bottom: 14px !important; }
    .step-number { min-width: 32px; height: 22px; padding: 0 7px; font-size: 11px; }
    .step-title { font-size: 1rem; }
    .step-description { font-size: 0.9375rem; margin-bottom: 10px; }
    .footer { padding: 40px 20px; }
    .theme-toggle { width: 40px; height: 40px; top: 14px; right: 14px; }
    .menu-toggle { width: 40px; height: 40px; top: 14px; left: 14px; }
    .lightbox-close { top: 14px; right: 14px; height: 40px; padding: 0 12px 0 10px; font-size: 13px; }
    .lightbox-hint { bottom: 16px; font-size: 11px; padding: 7px 14px; }
}

/* Hide Esc keyboard hint only on real phones (no physical keyboard) */
@media (max-width: 540px) {
    .lightbox-close-hint { display: none; }
    .lightbox-close { padding: 0 14px 0 12px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Print — expand all accordions */
@media print {
    body { background: white; color: black; font-size: 11pt; }
    .sidebar, .menu-toggle, .theme-toggle, .reading-progress, .footer-back-top, .lightbox, .overlay, .step-figure-zoom, .accordion-chevron, .accordion-count { display: none !important; }
    .main { margin-left: 0; }
    .hero { padding: 0 0 24pt; border-bottom: 1pt solid #ccc; background: white; }
    .hero-pattern { display: none; }
    .hero-title { color: black; font-size: 24pt; }
    .hero-description { color: #333; }
    .content { padding: 24pt 0; max-width: 100%; gap: 16pt; }
    .accordion { box-shadow: none; border: 1pt solid #ccc; }
    .accordion-panel { grid-template-rows: 1fr !important; }
    .accordion-panel-inner { overflow: visible !important; }
    .accordion-trigger { padding: 12pt 14pt; }
    .accordion-trigger-num { background: #f0f0f0; color: black; }
    .step-card { page-break-inside: avoid; break-inside: avoid; }
    .step-number { background: #f0f0f0; color: black; }
    a { color: black; text-decoration: underline; }
    img { max-width: 60% !important; max-height: 320pt !important; page-break-inside: avoid; }
}