/* ==========================================================================
   ADB Device Manager - Installation Guide CSS
   Implements a strict editorial design system matching trust_center.css:
   - Narrower content (max-width: 820px)
   - Strict spacing scale
   - High visual rhythm and whitespace
   - Dynamic platform selection tabs and responsive panels
   ========================================================================== */

:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-bg-page: #ffffff;
    --color-bg-card: #fafafa;
    --color-text-title: #111111;
    --color-text-body: #444444;
    --color-text-muted: #666666;
    --color-border: #eaeaea;
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Theme tokens */
    --color-header-bg: rgba(255, 255, 255, 0.85);
    --color-border-hover: #cbd5e1;
    --color-nav-hover-bg: #f0f7ff;
}

[data-theme="dark"] {
    --color-bg-page: #0b0f19;
    --color-bg-card: #131b2e;
    --color-text-title: #f8fafc;
    --color-text-body: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: #1e293b;

    --color-header-bg: rgba(11, 15, 25, 0.85);
    --color-border-hover: #334155;
    --color-nav-hover-bg: rgba(37, 99, 235, 0.12);
}

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

body {
    width: 100%;
    min-height: 100vh;
    background: var(--color-bg-page);
    font-family: var(--font-sans);
    color: var(--color-text-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Header styling */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-header-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 32px;
}

.header-content {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-text-title);
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.nav {
    display: flex;
    gap: 24px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.15s ease;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    transition: color 0.15s ease, transform 0.2s ease;
    outline: none;
    margin-left: 8px;
}

.theme-toggle-btn:hover {
    color: var(--color-primary);
    transform: translateY(-1px);
}

.theme-toggle-btn svg {
    width: 18px;
    height: 18px;
}

/* Toggle visibility of sun/moon icons depending on the theme */
[data-theme="dark"] .theme-toggle-btn .sun-icon {
    display: block;
}
[data-theme="dark"] .theme-toggle-btn .moon-icon {
    display: none;
}

:root:not([data-theme="dark"]) .theme-toggle-btn .sun-icon {
    display: none;
}
:root:not([data-theme="dark"]) .theme-toggle-btn .moon-icon {
    display: block;
}

/* Main Container */
.main-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 48px 24px 96px;
}

/* Hero Section */
.hero {
    text-align: left;
    margin-bottom: 32px;
}

.hero-title {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-text-title);
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 12px;
}

.hero-subtitle {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-muted);
    line-height: 1.5;
    max-width: 640px;
}

/* Platform Selection Grid */
.platform-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.platform-card {
    background: var(--color-bg-page);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 20px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    width: 100%;
}

.platform-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.06);
}

.platform-card.active {
    background: var(--color-nav-hover-bg);
    border-color: var(--color-primary);
    box-shadow: 0 8px 28px rgba(37, 99, 235, 0.1);
}

.platform-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 12px;
    object-fit: contain;
    transition: transform 0.2s ease;
}

.platform-card:hover .platform-icon {
    transform: scale(1.08);
}

.platform-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.platform-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text-title);
}

.platform-status {
    font-size: 9px;
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.platform-card.active .platform-status {
    color: var(--color-primary);
}

/* Platform Panels */
.platform-panel {
    display: none;
    opacity: 0;
    transform: translateY(8px);
    animation: fadeInUp 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.platform-panel.active {
    display: block;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* High-Scannability Summary Badges */
.summary-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    margin-bottom: 48px;
}

.summary-badge-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-title);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 8px 16px;
}

.summary-badge-item i {
    width: 14px;
    height: 14px;
    color: var(--color-primary);
    flex-shrink: 0;
}

/* Page Summary / Metadata Index */
.page-summary-block {
    display: flex;
    justify-content: space-between;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 48px;
    gap: 32px;
}

.summary-index {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.summary-index h4 {
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-title);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.summary-index ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
}

.summary-index li a {
    font-size: 13px;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.summary-index li a:hover {
    text-decoration: underline;
}

.summary-meta {
    display: flex;
    flex-direction: column;
    justify-content: center;
    border-left: 1px solid var(--color-border);
    padding-left: 32px;
    min-width: 140px;
    gap: 4px;
    flex-shrink: 0;
}

.summary-meta span {
    font-size: 11px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.summary-meta strong {
    font-size: 13px;
    color: var(--color-text-title);
    font-weight: 700;
}

/* Sections Layout */
.section {
    margin-bottom: 48px;
}

.section-header {
    margin-bottom: 16px;
}

.section-num {
    font-size: 12px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-title);
    letter-spacing: -0.3px;
}

.section-content {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text-body);
}

.section-content p {
    max-width: 680px;
    margin-bottom: 16px;
}

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

.section-divider {
    height: 1px;
    background-color: var(--color-border);
    border: none;
    margin: 48px 0;
}

/* Lists and callouts with perfect icon-content alignment */
.clean-list {
    list-style: none;
    margin: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.clean-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.clean-list li i {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    margin-top: 3px;
    flex-shrink: 0;
}

.clean-list li div {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.clean-list li div strong {
    font-size: 14px;
    color: var(--color-text-title);
    font-weight: 700;
}

.clean-list li div span {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.5;
    max-width: 680px;
}

.font-spaced {
    margin-top: 16px;
}

/* Interactive Text Links */
.text-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s ease;
}

.text-link:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* Callout Clean Note */
.clean-note {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 13px;
    color: var(--color-text-body);
    margin-top: 32px;
    padding: 16px 24px;
    border-left: 3px solid var(--color-primary);
    background: var(--color-bg-card);
    border-radius: 0 6px 6px 0;
}

.clean-note i {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.clean-note span {
    line-height: 1.5;
}

/* Code Snippets */
.code-box {
    background: #0f172a;
    color: #e2e8f0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin-top: 8px;
    max-width: 100%;
}

.code-box code {
    background: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
    border: none;
    border-radius: 0;
}

code {
    background: var(--color-bg-card);
    color: var(--color-text-title);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--color-border);
}

/* Data grid items */
.data-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.data-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg-card);
    transition: all 0.2s ease;
}

.data-item:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.data-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-title);
}

.data-item-header h4 {
    font-size: 14px;
    font-weight: 700;
}

.data-item-header i {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.data-item p {
    font-size: 12px;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
}

.status-badge {
    font-size: 12px;
    font-weight: 600;
    margin-top: 8px;
}

.status-badge a {
    text-decoration: none;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
}

/* GitHub Star Button */
.download-btn-github {
    display: inline-flex;
    align-items: center;
    background: #24292f;
    color: #ffffff;
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid rgba(27, 31, 36, 0.15);
    transition: background 0.2s ease;
}

.download-btn-github:hover {
    background: #1f2328;
}

/* Footer Section styling */
.footer {
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-card);
    padding: 64px 24px 32px;
    margin-top: 96px;
}

.footer-main {
    max-width: 820px;
    margin: 0 auto 48px;
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 48px 32px;
}

.footer-contact-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-column-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--color-text-title);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-contact-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.15s ease;
}

.footer-contact-item:hover {
    color: var(--color-primary);
}

.footer-contact-item svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-muted);
    transition: color 0.15s ease;
}

.footer-contact-item:hover svg {
    color: var(--color-primary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.15s ease;
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    max-width: 820px;
    margin: 0 auto;
    border-top: 1px solid var(--color-border);
    padding-top: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    font-size: 13px;
    color: var(--color-text-muted);
}

.footer-copyright a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 600;
}

.footer-copyright a:hover {
    color: var(--color-primary);
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.15s ease;
}

.footer-bottom-links a:hover {
    color: var(--color-primary);
}

.footer-gradient-border {
    height: 3px;
    background: linear-gradient(90deg, #2563eb, #60a5fa, #3b82f6);
    margin-top: 48px;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    .main-container {
        padding: 32px 16px 64px;
    }

    .platform-selector {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
        margin-bottom: 32px;
    }

    .platform-card {
        padding: 16px 8px;
    }

    .platform-icon {
        width: 32px;
        height: 32px;
    }

    .platform-name {
        font-size: 13px;
    }

    .platform-status {
        font-size: 8px;
    }

    .page-summary-block {
        flex-direction: column;
        gap: 20px;
        padding: 16px;
        margin-bottom: 32px;
    }

    .summary-meta {
        border-left: none;
        border-top: 1px solid var(--color-border);
        padding-left: 0;
        padding-top: 16px;
    }

    .data-list-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .footer-main {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .footer-bottom-links {
        flex-wrap: wrap;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .platform-selector {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .platform-card {
        flex-direction: row;
        gap: 16px;
        padding: 12px 16px;
        text-align: left;
        align-items: center;
    }

    .platform-icon {
        margin-bottom: 0;
    }
}

/* Copyable Code Blocks */
.code-block-wrapper {
    position: relative;
    margin-top: 8px;
    max-width: 100%;
}

.code-block-wrapper .code-box {
    margin-top: 0;
    padding-right: 48px;
    /* space for copy button */
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #94a3b8;
    padding: 6px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.25);
}

.copy-btn svg {
    width: 14px;
    height: 14px;
}