/* ============================================
   ThreadsToolsPro2 Documentation - Design System
   ベース: 31_xtools-docs-auth / styles.css
   アクセントのみ Threads ブランド（インディゴ→パープル）へ変更
   ============================================ */

:root {
    /* Core Colors - Dark Theme */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #16161f;
    --bg-elevated: #1e1e2a;

    /* Text Colors */
    --text-primary: #f4f4f6;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;

    /* Brand Colors - ThreadsToolsPro2 Indigo→Purple */
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-glow: rgba(99, 102, 241, 0.3);
    --accent-subtle: rgba(99, 102, 241, 0.12);

    /* Status Colors */
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);

    /* Borders & Lines */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(139, 92, 246, 0.35);

    /* Spacing */
    --sidebar-width: 280px;
    --content-max-width: 900px;

    /* Typography */
    --font-display: 'Outfit', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--accent-glow);
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 2rem;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================
   Sidebar Navigation
   ============================================ */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon {
    width: 34px;
    height: 34px;
    background: var(--accent-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 9px;
    font-weight: 800;
    font-size: 1rem;
    box-shadow: var(--shadow-glow);
    flex-shrink: 0;
}

.logo-text {
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.version-badge {
    padding: 0.25rem 0.5rem;
    background: var(--accent-subtle);
    color: var(--accent-primary);
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

.nav-section {
    padding: 1rem 0;
}

.nav-section:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.nav-section-title {
    padding: 0.5rem 1.5rem;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent-primary);
    transform: scaleY(0);
    transition: transform var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--accent-subtle);
    text-decoration: none;
}

.nav-link.active {
    color: var(--accent-primary);
    background: var(--accent-subtle);
}

.nav-link.active::before {
    transform: scaleY(1);
}

.nav-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-link:hover .nav-icon,
.nav-link.active .nav-icon {
    opacity: 1;
}

.sidebar-footer {
    margin-top: auto;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.support-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.support-link:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    text-decoration: none;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 200;
    width: 44px;
    height: 44px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    padding: 6rem 2rem 4rem;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
        radial-gradient(ellipse 60% 40% at 80% 50%, rgba(139, 92, 246, 0.1), transparent);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-highlight), transparent);
}

.hero-content {
    position: relative;
    max-width: var(--content-max-width);
    margin: 0 auto;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.1rem;
    background: var(--accent-subtle);
    border: 1px solid var(--border-highlight);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
    animation: fadeInUp 0.6s ease-out;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.6rem, 7vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.25rem;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-title .gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.35rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto 2.5rem;
    line-height: 1.8;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.95rem 1.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn:hover {
    text-decoration: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.55);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--text-muted);
}

/* ============================================
   Sections (Features + Content)
   ============================================ */

.section {
    padding: 3.5rem 2rem;
    /* 全セクションを「概要」と同じ幅に統一（左端のズレ＝インデント差を解消） */
    max-width: 1200px;
    margin: 0 auto;
    border-top: 1px solid var(--border-color);
}

.section--wide {
    max-width: 1200px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent-gradient);
}

.section-lead {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.02rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--border-highlight);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-subtle);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================
   Step Cards (説明＋スクショ 2カラム)
   ============================================ */

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.step-card-head {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.step-number {
    width: 30px;
    height: 30px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-card-head h3 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
}

.step-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

.step-body--text-only {
    grid-template-columns: 1fr;
}

.step-text h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 0.6rem;
    color: var(--accent-primary);
}

.step-text p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.step-text :where(ol, ul) {
    padding-left: 1.3rem;
    color: var(--text-secondary);
}

.step-text li {
    margin-bottom: 0.4rem;
}

.step-text li strong,
.step-text p strong {
    color: var(--text-primary);
}

.step-text code {
    font-family: var(--font-mono);
    font-size: 0.82em;
    padding: 0.15em 0.45em;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--accent-primary);
    word-break: break-all;
}

/* ============================================
   Screenshot Container + Lightbox
   ============================================ */

.screenshot-container {
    margin: 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.screenshot {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    transition: transform var(--transition-normal);
    cursor: zoom-in;
}

.screenshot:hover {
    transform: scale(1.01);
}

.screenshot-caption {
    padding: 0.6rem 1rem;
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.video-embed {
    position: relative;
    aspect-ratio: 16 / 9;
    background: #000;
}

.video-embed iframe {
    width: 100%;
    height: 100%;
    display: block;
    border: 0;
}

.image-lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 2rem;
    cursor: zoom-out;
    animation: lightboxFadeIn 0.15s ease-out;
}

.image-lightbox.is-open {
    display: flex;
}

@keyframes lightboxFadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.image-lightbox__img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    border-radius: 4px;
    cursor: zoom-out;
}

.image-lightbox__close {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    transition: background 0.15s ease;
}

.image-lightbox__close:hover {
    background: rgba(255, 255, 255, 0.3);
}

.image-lightbox__caption {
    position: absolute;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    max-width: 80%;
    padding: 0.5rem 1rem;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    font-size: 0.85rem;
    border-radius: 4px;
    text-align: center;
}

/* ============================================
   Callout Boxes
   ============================================ */

.callout {
    border-radius: 8px;
    padding: 1rem 1.25rem;
    margin-top: 1rem;
}

.callout p:last-child,
.callout ul:last-child,
.callout ol:last-child {
    margin-bottom: 0;
}

.callout-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    font-size: 0.95rem;
}

.callout :where(ul, ol) {
    padding-left: 1.3rem;
    color: var(--text-secondary);
    margin: 0;
}

.callout li {
    margin-bottom: 0.35rem;
}

.callout li strong,
.callout p strong {
    color: var(--text-primary);
}

.callout--highlight {
    background: var(--accent-subtle);
    border: 1px solid var(--border-highlight);
}

.callout--highlight .callout-title { color: var(--accent-primary); }

.callout--info {
    background: var(--info-bg);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.callout--info .callout-title { color: var(--info); }

.callout--warning {
    background: var(--warning-bg);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.callout--warning .callout-title { color: var(--warning); }

.callout--success {
    background: var(--success-bg);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.callout--success .callout-title { color: var(--success); }

.callout p {
    color: var(--text-secondary);
}

/* ============================================
   FAQ (Troubleshooting)
   ============================================ */

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.faq-q-mark {
    width: 24px;
    height: 24px;
    background: var(--accent-gradient);
    color: #fff;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.faq-answer {
    padding: 1.1rem 1.25rem;
}

.faq-answer ol {
    padding-left: 1.3rem;
    color: var(--text-secondary);
    margin: 0.4rem 0 0;
}

.faq-answer li {
    margin-bottom: 0.4rem;
}

.faq-answer strong {
    color: var(--text-primary);
}

/* ============================================
   Footer
   ============================================ */

.main-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    margin-top: 2rem;
}

.footer-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-cta {
    background: var(--accent-subtle);
    border: 1px solid var(--border-highlight);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    text-align: left;
    color: var(--text-secondary);
}

.footer-cta strong {
    color: var(--accent-primary);
}

.footer-slack {
    margin-top: 1rem;
    text-align: center;
}

.footer-slack .btn {
    margin-top: 0.75rem;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: flex;
    }

    .main-content {
        margin-left: 0;
    }

    .hero {
        padding: 5rem 1.5rem 3rem;
    }

    .hero-title {
        font-size: clamp(1.3rem, 6vw, 2.2rem);
        word-break: break-word;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .section {
        padding: 2.5rem 1.25rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .step-body {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-description br {
        display: none;
    }
}

/*
  Version History
  ver1.2 (2026-11-01) - ⓘ の部品 .info / .info-btn / .info-pop を追加（「お支払い・解約」で使用。押せる範囲 44px・タップで開閉）。
  ver1.1 (2026-08-23) - .section の最大幅を 1200px に統一（「概要」のみ広く、
                        ユーザー登録以降が右にズレて見えるインデント差を解消）。
*/

/* ============================================
   ⓘ（インフォメーションマーク）: タップ／クリックで開閉・PC はマウスを乗せても開く・押せる範囲 44px
   ============================================ */
.info { position: relative; display: inline-flex; flex: none; vertical-align: middle; margin-left: 0.25rem; }
.info-btn {
    width: 44px; height: 44px; margin: -10px -8px -10px -6px;
    border: 0; background: transparent; cursor: pointer;
    display: inline-grid; place-items: center; border-radius: 9999px;
    color: var(--text-muted);
}
.info-btn > span {
    width: 18px; height: 18px; border-radius: 9999px; border: 1.5px solid currentColor;
    display: grid; place-items: center; font: 700 11px/1 Georgia, "Times New Roman", serif;
}
.info-btn:hover, .info.open .info-btn { color: var(--accent-primary); }
.info-btn:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: -6px; }
.info-pop {
    display: none; position: absolute; top: calc(100% + 6px); right: -4px; z-index: 30;
    width: min(320px, calc(100vw - 48px));
    background: var(--bg-elevated); color: var(--text-secondary);
    border: 1px solid var(--border-highlight); border-radius: 10px;
    box-shadow: var(--shadow-sm);
    padding: 10px 12px; font-family: var(--font-body); font-size: 0.85rem; font-weight: 400; line-height: 1.7;
}
.info.open .info-pop { display: block; }
@media (hover: hover) and (pointer: fine) { .info:hover .info-pop { display: block; } }
/* 見出しの横の ⓘ は吹き出しを右へ開く（左へ開くと画面の外へはみ出す） */
.info--start .info-pop { left: -6px; right: auto; }
.info-line { display: block; }
.info-line:first-child { font-weight: 700; color: var(--text-primary); margin-bottom: 2px; }