/* ══════════════════════════════════════════════════════════════
   SETUP GUIDE — Premium Step-by-Step Design
   Page 1: Selection screen (3 cards)
   Page 2: Split-panel steps (left text / right image)
   ══════════════════════════════════════════════════════════════ */

/* ── 1. Tokens ─────────────────────────────────────────────── */
:root {
    /* Brand Colors */
    --android: #16a34a;
    --android-soft: #dcfce7;
    --android-glow: rgba(22, 163, 74, .15);
    --android-grad: linear-gradient(135deg, #16a34a 0%, #22c55e 100%);

    --windows: #2563eb;
    --windows-soft: #dbeafe;
    --windows-glow: rgba(37, 99, 235, .15);
    --windows-grad: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);

    --cmd-dark: #1e1e2e;
    --cmd-accent: #7dd3fc;

    /* Neutrals */
    --bg: #f4f6fa;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --mono: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;

    /* Spacing */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 20px;
    --sp-6: 24px;
    --sp-8: 32px;
    --sp-10: 40px;
    --sp-12: 48px;
    --sp-16: 64px;

    /* Radius */
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 16px;
    --r-xl: 20px;
    --r-2xl: 24px;
    --r-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, .04), 0 1px 2px rgba(0, 0, 0, .06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, .06), 0 2px 4px rgba(0, 0, 0, .04);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, .08), 0 4px 8px rgba(0, 0, 0, .04);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, .1);

    /* Motion */
    --ease: cubic-bezier(.16, 1, .3, 1);
    --spring: cubic-bezier(.34, 1.56, .64, 1);
    --duration: 350ms;
}

/* ── 2. Reset & Base ───────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body,
html {
    height: 100%;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text-primary);
    line-height: 1.6;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ── 3. App Container ─────────────────────────────────────── */
.app {
    width: 100%;
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

/* ── 4. Pages (page system) ────────────────────────────────── */
.page {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    z-index: 0;
    transition: opacity var(--duration) var(--ease),
        transform var(--duration) var(--ease);
    transform: translateX(30px);
}

.page.active {
    opacity: 1;
    pointer-events: auto;
    z-index: 5;
    transform: translateX(0);
}

.page.exit-left {
    opacity: 0;
    transform: translateX(-30px);
    pointer-events: none;
    z-index: 1;
}

.page.enter-left {
    transform: translateX(-30px);
}

/* ══════════════════════════════════════════════════════════════
   PAGE 1: SELECTION SCREEN
   ══════════════════════════════════════════════════════════════ */

.select-page {
    align-items: center;
    justify-content: center;
    padding: var(--sp-8);
    background: var(--bg);
}

.select-page__inner {
    width: 100%;
    max-width: 560px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-10);
}

/* Header */
.select-header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-3);
}

.select-header__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-1) var(--sp-3);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-full);
    font-size: .6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--text-muted);
}

.select-header__badge svg {
    color: var(--android);
}

.select-header__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -.03em;
    line-height: 1.1;
    color: var(--text-primary);
}

.select-header__sub {
    font-size: .9375rem;
    color: var(--text-secondary);
    max-width: 380px;
    line-height: 1.6;
}

/* Selection Cards */
.select-cards {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.select-card {
    display: flex;
    align-items: center;
    gap: var(--sp-5);
    padding: var(--sp-5) var(--sp-6);
    background: var(--surface);
    border: 1.5px solid var(--border-light);
    border-radius: var(--r-xl);
    transition: all 250ms var(--ease);
    outline: none;
    text-align: left;
    position: relative;
    overflow: hidden;
}

.select-card::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 250ms ease;
    border-radius: inherit;
}

.select-card[data-guide="android"]::before {
    background: linear-gradient(135deg, rgba(22, 163, 74, .03) 0%, transparent 60%);
}

.select-card[data-guide="windows-cmd"]::before,
.select-card[data-guide="windows-gui"]::before {
    background: linear-gradient(135deg, rgba(37, 99, 235, .03) 0%, transparent 60%);
}

.select-card:hover::before {
    opacity: 1;
}

.select-card:hover {
    border-color: var(--border);
    box-shadow: var(--shadow-md);
}

.select-card:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.select-card[data-guide="android"]:hover {
    border-color: rgba(22, 163, 74, .3);
}

.select-card[data-guide="windows-cmd"]:hover,
.select-card[data-guide="windows-gui"]:hover {
    border-color: rgba(37, 99, 235, .3);
}

.select-card:focus-visible {
    outline: 2px solid var(--windows);
    outline-offset: 2px;
}

/* Card Icon */
.select-card__icon {
    width: 52px;
    height: 52px;
    border-radius: var(--r-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 200ms var(--spring);
}


.select-card__icon--android {
    background: var(--android-soft);
    color: var(--android);
}

.select-card__icon--cmd {
    background: var(--cmd-dark);
    color: var(--cmd-accent);
}

.select-card__icon--gui {
    background: var(--windows-soft);
    color: var(--windows);
}

/* Card Text */
.select-card__text {
    flex: 1;
    min-width: 0;
}

.select-card__name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
}

.select-card__desc {
    font-size: .8125rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Card Arrow */
.select-card__arrow {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform 200ms var(--ease), color 200ms;
    opacity: .5;
}

.select-card:hover .select-card__arrow {
    transform: translateX(3px);
    opacity: 1;
}

.select-card[data-guide="android"]:hover .select-card__arrow {
    color: var(--android);
}

.select-card[data-guide="windows-cmd"]:hover .select-card__arrow,
.select-card[data-guide="windows-gui"]:hover .select-card__arrow {
    color: var(--windows);
}

/* Section Labels */
.select-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--sp-3);
}

.select-section__label {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-size: .6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--text-muted);
    padding-left: var(--sp-2);
}

.section-emoji {
    flex-shrink: 0;
    opacity: .7;
}

/* ══════════════════════════════════════════════════════════════
   PAGE 2: STEP PAGES (Split Layout)
   ══════════════════════════════════════════════════════════════ */

.step-page {
    flex-direction: column;
    background: var(--surface);
}

/* Top Bar */
.step-topbar {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--sp-4) var(--sp-8);
    border-bottom: 1px solid var(--border-light);
    background: var(--surface);
    z-index: 10;
}

.step-topbar__left {
    display: flex;
    align-items: center;
    gap: var(--sp-4);
}

.step-topbar__back {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--r-sm);
    font-size: .8125rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 160ms ease;
}

.step-topbar__back:hover {
    background: var(--surface-2);
    color: var(--text-secondary);
}

.step-topbar__title {
    font-size: .875rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Step Indicators (dots) */
.step-dots {
    display: flex;
    align-items: center;
    gap: 6px;
}

.step-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--r-full);
    background: var(--border);
    transition: all 250ms var(--ease);
    cursor: pointer;
    border: none;
    outline: none;
    padding: 0;
}

.step-dot:focus-visible {
    outline: 2px solid var(--text-muted);
    outline-offset: 2px;
}

.step-dot.active {
    width: 24px;
}

.step-dot.done {
    opacity: .6;
}

/* Android colors */
.guide-android .step-dot.active {
    background: var(--android);
}

.guide-android .step-dot.done {
    background: var(--android);
}

/* Windows colors */
.guide-windows .step-dot.active {
    background: var(--windows);
}

.guide-windows .step-dot.done {
    background: var(--windows);
}

/* Split Content Area */
.step-content {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* Individual Step Slide */
.step-slide {
    position: absolute;
    inset: 0;
    display: flex;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration) var(--ease),
        transform var(--duration) var(--ease);
    transform: translateX(40px);
}

.step-slide.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(0);
    z-index: 2;
}

.step-slide.exit {
    opacity: 0;
    transform: translateX(-40px);
    z-index: 1;
}

/* Left Panel (Text) */
.step-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 520px;
    overflow-y: auto;
}

.step-left__body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--sp-8) var(--sp-8) var(--sp-5) var(--sp-12);
    gap: var(--sp-5);
}

.step-left__nav {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--sp-4) var(--sp-8) var(--sp-6) var(--sp-12);
    gap: var(--sp-3);
}

.step-left__tag {
    display: inline-block;
    font-size: .6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--text-muted);
    padding: var(--sp-1) var(--sp-3);
    background: var(--surface-2);
    border-radius: var(--r-full);
    border: 1px solid var(--border-light);
    align-self: flex-start;
}

.step-left__title {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 800;
    letter-spacing: -.025em;
    line-height: 1.15;
    color: var(--text-primary);
}

.step-left__desc {
    font-size: .9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.step-left__desc strong {
    color: var(--text-primary);
    font-weight: 600;
}

.step-left__desc em {
    color: var(--text-primary);
    font-style: italic;
}


/* Chip Row */
.step-chips {
    display: flex;
    gap: var(--sp-2);
    flex-wrap: wrap;
}

.step-chip {
    display: inline-flex;
    align-items: center;
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--r-full);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .02em;
}

.step-chip--warn {
    background: #fef9c3;
    color: #854d0e;
    border: 1px solid #fde68a;
}

.step-chip--action {
    background: var(--android-soft);
    color: var(--android);
    border: 1px solid #bbf7d0;
}

/* Mini Steps */
.step-mini-list {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-4);
    background: var(--surface-2);
    border-radius: var(--r-md);
    border: 1px solid var(--border-light);
}

.step-mini {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    font-size: .8125rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.step-mini__num {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border-radius: var(--r-full);
    font-size: .6875rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
}

.guide-android .step-mini__num {
    background: var(--android-soft);
    color: var(--android);
}

.guide-windows .step-mini__num {
    background: var(--windows-soft);
    color: var(--windows);
}

.step-mini strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Code Block */
.step-code {
    background: #0f172a;
    border-radius: var(--r-md);
    padding: var(--sp-4) var(--sp-5);
    display: flex;
    align-items: center;
    gap: var(--sp-4);
    border: 1px solid rgba(255, 255, 255, .08);
}

.step-code__label {
    font-size: .625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--cmd-accent);
    flex-shrink: 0;
}

.step-code__text {
    flex: 1;
    font-family: var(--mono);
    font-size: .875rem;
    color: #e2e8f0;
    line-height: 1.5;
    user-select: all;
}

.step-code__copy {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-1);
    padding: var(--sp-1) var(--sp-3);
    border-radius: var(--r-sm);
    font-size: .75rem;
    font-weight: 600;
    color: #94a3b8;
    border: 1px solid rgba(255, 255, 255, .12);
    transition: all 160ms ease;
    white-space: nowrap;
}

.step-code__copy:hover {
    background: rgba(255, 255, 255, .08);
    color: #fff;
}

/* Right Panel (Image) */
.step-right {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--sp-8);
    background: var(--surface-2);
    border-left: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.step-right::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: .4;
}

.guide-android .step-right::before {
    background: linear-gradient(160deg, rgba(22, 163, 74, .04) 0%, transparent 50%);
}

.guide-windows .step-right::before {
    background: linear-gradient(160deg, rgba(37, 99, 235, .04) 0%, transparent 50%);
}

.step-right__img {
    position: relative;
    z-index: 1;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    transition: transform 300ms var(--ease);
}

.step-slide.active .step-right__img {
    animation: imgFadeIn 500ms var(--ease) forwards;
}

@keyframes imgFadeIn {
    from {
        opacity: 0;
        transform: scale(.96);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Placeholder when no image */
.step-right__placeholder {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-3);
    color: var(--text-muted);
    text-align: center;
}

.step-right__placeholder svg {
    opacity: .3;
}

.step-right__placeholder span {
    font-size: .8125rem;
    font-weight: 500;
}

/* Bottom Nav (removed — nav is now inside .step-left__nav) */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-5);
    border-radius: var(--r-md);
    font-size: .875rem;
    font-weight: 600;
    transition: all 180ms var(--ease);
    white-space: nowrap;
    line-height: 1;
}

.btn--ghost {
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn--ghost:hover {
    background: var(--surface-2);
    color: var(--text-secondary);
    border-color: var(--text-muted);
}

.btn--primary {
    color: #fff;
    padding: var(--sp-3) var(--sp-6);
}

.guide-android .btn--primary {
    background: var(--android-grad);
    box-shadow: 0 4px 14px var(--android-glow);
}

.guide-android .btn--primary:hover {
    box-shadow: 0 6px 20px var(--android-glow);
}

.guide-windows .btn--primary {
    background: var(--windows-grad);
    box-shadow: 0 4px 14px var(--windows-glow);
}

.guide-windows .btn--primary:hover {
    box-shadow: 0 6px 20px var(--windows-glow);
}

.btn--primary:active {
    transform: translateY(0);
}

.btn--link {
    color: var(--text-muted);
    font-size: .8125rem;
    font-weight: 500;
    text-decoration: underline;
    text-decoration-color: transparent;
    padding: var(--sp-2) var(--sp-3);
}

.btn--link:hover {
    color: var(--text-secondary);
    text-decoration-color: var(--border);
}

.btn[disabled] {
    opacity: .35;
    pointer-events: none;
}

/* ── Toast ─────────────────────────────────────────────────── */
.toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(16px);
    background: var(--text-primary);
    color: #fff;
    font-size: .875rem;
    font-weight: 500;
    padding: var(--sp-3) var(--sp-6);
    border-radius: var(--r-full);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease, transform 240ms var(--ease);
    white-space: nowrap;
    z-index: 100;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
    .step-slide {
        flex-direction: column;
    }

    .step-left {
        max-width: none;
        flex: none;
    }

    .step-left__body {
        padding: var(--sp-6) var(--sp-4) var(--sp-3);
    }

    .step-left__nav {
        padding: var(--sp-3) var(--sp-4) var(--sp-4);
    }

    .step-right {
        border-left: none;
        border-top: 1px solid var(--border-light);
        padding: var(--sp-4);
        min-height: 200px;
    }

    .step-topbar {
        padding: var(--sp-3) var(--sp-4);
    }



    .select-page {
        padding: var(--sp-6) var(--sp-4);
    }

    .select-card {
        padding: var(--sp-4) var(--sp-5);
    }

    .step-left__title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .step-topbar__title {
        display: none;
    }

    .step-code {
        flex-wrap: wrap;
        gap: var(--sp-2);
    }

    .step-code__copy {
        margin-left: auto;
    }
}

/* ── Reduced Motion ────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
}