/* ===== Tutorial / Docs Page Styles ===== */

/* --- Hero --- */
.docs-hero {
    padding-top: calc(var(--nav-height) + 80px);
    padding-bottom: 80px;
    position: relative;
    background: radial-gradient(ellipse at 40% 0%, #EEF2FF 0%, #FFFFFF 65%);
    overflow: hidden;
    text-align: center;
}

.docs-hero-content {
    position: relative;
    z-index: 2;
    max-width: 780px;
    margin: 0 auto;
}

.docs-hero-title {
    font-size: 52px;
    letter-spacing: -1.5px;
    margin-bottom: 20px;
    color: var(--text-title);
    line-height: 1.15;
}

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

.docs-hero-desc {
    font-size: 18px;
    color: var(--text-body);
    margin-bottom: 40px;
    line-height: 1.75;
}

.docs-platform-pills {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.docs-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    background: #fff;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-title);
    transition: all 0.25s ease;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}

.docs-pill:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(51, 112, 255, 0.18);
}

/* --- Overview Steps --- */
.docs-overview {
    padding: 80px 0;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.docs-overview .section-header {
    margin-bottom: 56px;
}

.overview-steps {
    display: flex;
    align-items: flex-start;
    gap: 0;
    margin-bottom: 40px;
}

.overview-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--brand-primary);
    flex-shrink: 0;
    padding-top: 72px;
    opacity: 0.4;
    width: 48px;
}

.overview-step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 0 16px;
}

.overview-num {
    font-size: 11px;
    font-weight: 800;
    color: var(--brand-primary);
    letter-spacing: 2px;
    margin-bottom: 16px;
    text-transform: uppercase;
    font-family: monospace;
}

.overview-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
    margin-bottom: 20px;
    box-shadow: var(--shadow-glow);
    flex-shrink: 0;
}

.overview-text h3 {
    font-size: 17px;
    margin-bottom: 10px;
    color: var(--text-title);
}

.overview-text p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.7;
}

/* --- Tip Box --- */
.docs-tip-box {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 22px;
    background: rgba(51, 112, 255, 0.06);
    border: 1px solid rgba(51, 112, 255, 0.14);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.7;
}

.docs-tip-box i {
    font-size: 22px;
    color: var(--brand-primary);
    flex-shrink: 0;
    margin-top: 1px;
}

.docs-tip-box strong {
    color: var(--text-title);
}

/* --- Sticky Platform Tabs --- */
.docs-tabs-sticky {
    position: sticky;
    top: var(--nav-height);
    z-index: 900;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(31, 35, 41, 0.06);
}

.docs-tabs-inner {
    display: flex;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.docs-tabs-inner::-webkit-scrollbar { display: none; }

.docs-tab {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 16px 22px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-body);
    border-bottom: 2.5px solid transparent;
    transition: all 0.22s ease;
    white-space: nowrap;
    cursor: pointer;
    text-decoration: none;
}

.docs-tab:hover { color: var(--brand-primary); background: rgba(51, 112, 255, 0.04); }

.docs-tab.active {
    color: var(--brand-primary);
    border-bottom-color: var(--brand-primary);
    background: rgba(51, 112, 255, 0.04);
}

/* --- Platform Sections --- */
.docs-section {
    padding: 80px 0;
    background: #fff;
}

.docs-section-alt {
    background: var(--bg-light);
}

.docs-section-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 36px;
}

.docs-section-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    color: #fff;
    flex-shrink: 0;
    box-shadow: var(--shadow-glow);
}

.docs-icon-macos { background: linear-gradient(135deg, #1a1a2e, #555); }
.docs-icon-android { background: linear-gradient(135deg, #27c93f, #0fad5c); }
.docs-icon-ios { background: linear-gradient(135deg, #007AFF, #5AC8FA); }
.docs-icon-linux { background: linear-gradient(135deg, #F59E0B, #D97706); }

.docs-section-header h2 {
    font-size: 30px;
    margin-bottom: 6px;
    color: var(--text-title);
}

.docs-section-desc {
    font-size: 14px;
    color: var(--text-muted);
}

/* --- Client Sub-tabs --- */
.client-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}

.client-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 20px;
    background: rgba(0, 0, 0, 0.04);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-body);
    cursor: pointer;
    transition: all 0.22s ease;
    font-family: inherit;
}

.client-tab:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    background: rgba(51, 112, 255, 0.05);
}

.client-tab.active {
    background: var(--brand-primary);
    border-color: var(--brand-primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.client-tab-badge {
    font-size: 11px;
    font-weight: 700;
    background: rgba(22, 163, 74, 0.15);
    color: #15803d;
    padding: 2px 7px;
    border-radius: var(--radius-pill);
}

.client-tab.active .client-tab-badge {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.client-tab-badge-blue {
    background: rgba(51, 112, 255, 0.12);
    color: var(--brand-primary);
}

.client-tab.active .client-tab-badge-blue {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

/* --- Client Panels --- */
.client-panel {
    display: none;
}

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

/* --- Tutorial Steps --- */
.docs-step-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.docs-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 28px 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.docs-step:last-child {
    border-bottom: none;
}

.docs-step-num {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: #fff;
    font-size: 15px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-glow);
    position: relative;
    z-index: 1;
}

.docs-step-body {
    flex: 1;
    min-width: 0;
}

.docs-step-body h3 {
    font-size: 18px;
    color: var(--text-title);
    margin-bottom: 12px;
    font-weight: 700;
}

.docs-step-body p {
    font-size: 14.5px;
    color: var(--text-body);
    line-height: 1.75;
    margin-bottom: 12px;
}

.docs-step-body p:last-child {
    margin-bottom: 0;
}

/* --- Download Link Button --- */
.docs-dl-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 20px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    margin-top: 14px;
    transition: all 0.22s ease;
    box-shadow: var(--shadow-glow);
}

.docs-dl-link:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(51, 112, 255, 0.35);
}

/* --- Notice Boxes --- */
.docs-notice {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    background: rgba(51, 112, 255, 0.06);
    border: 1px solid rgba(51, 112, 255, 0.14);
    border-radius: var(--radius-sm);
    font-size: 13.5px;
    color: var(--text-body);
    line-height: 1.65;
    margin-top: 12px;
}

.docs-notice i {
    font-size: 17px;
    color: var(--brand-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.docs-notice-warn {
    background: rgba(217, 119, 6, 0.06);
    border-color: rgba(217, 119, 6, 0.18);
}

.docs-notice-warn i {
    color: #d97706;
}

/* --- Ordered Sub-steps --- */
.docs-ordered-steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 14px 0;
}

.docs-sub-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.65;
}

.docs-sub-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: rgba(51, 112, 255, 0.1);
    color: var(--brand-primary);
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

/* --- Proxy Mode Compare (inline) --- */
.docs-mode-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 14px;
}

.docs-mode-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 14px 16px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.docs-mode-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    flex-shrink: 0;
}

.docs-mode-icon-blue { background: linear-gradient(135deg, #3370FF, #6366F1); }
.docs-mode-icon-purple { background: linear-gradient(135deg, #7C3AED, #4F46E5); }

.docs-mode-item strong {
    font-size: 13.5px;
    color: var(--text-title);
    display: block;
    margin-bottom: 4px;
}

.docs-mode-item p {
    font-size: 12.5px;
    color: var(--text-body);
    line-height: 1.6;
    margin: 0 !important;
}

/* --- Success Badge --- */
.docs-success-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: rgba(22, 163, 74, 0.09);
    border: 1px solid rgba(22, 163, 74, 0.2);
    border-radius: var(--radius-md);
    font-size: 13.5px;
    color: #15803d;
    font-weight: 600;
    margin-top: 14px;
}

.docs-success-badge i {
    font-size: 18px;
    flex-shrink: 0;
}

/* --- iOS Prerequisite Block --- */
.docs-prerequisite {
    background: linear-gradient(145deg, #F6F8FF, #ECF0FF);
    border: 1px solid rgba(51, 112, 255, 0.14);
    border-radius: var(--radius-xl);
    padding: 40px;
}

.docs-prereq-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.docs-prereq-header i {
    font-size: 26px;
    color: var(--text-title);
}

.docs-prereq-header h3 {
    font-size: 22px;
    color: var(--text-title);
    font-weight: 700;
}

.docs-prereq-intro {
    font-size: 15px;
    color: var(--text-body);
    margin-bottom: 28px;
    line-height: 1.7;
}

.docs-prereq-steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.docs-prereq-step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.docs-tutorial-num {
    width: 30px;
    height: 30px;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.docs-prereq-step h4 {
    font-size: 15px;
    color: var(--text-title);
    margin-bottom: 6px;
    font-weight: 600;
}

.docs-prereq-step p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.75;
}

.docs-prereq-step code {
    background: rgba(51, 112, 255, 0.1);
    color: var(--brand-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'Consolas', 'Monaco', monospace;
}

/* --- Code Blocks --- */
.docs-code-block {
    background: #0D1117;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 14px;
}

.docs-code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.04);
    font-size: 12px;
    font-weight: 600;
    color: #6E7681;
    font-family: monospace;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.docs-copy-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.14);
    color: #8F959E;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s ease;
    font-family: inherit;
}

.docs-copy-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #CDD6F4;
}

.docs-code-content {
    padding: 22px 24px;
    margin: 0;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.9;
    overflow-x: auto;
    color: #CDD6F4;
}

.docs-code-content code { background: none; padding: 0; }
.cli-comment { color: #6E7681; font-style: italic; }
.cli-cmd { color: #79C0FF; }

/* --- Proxy Mode Explained Section --- */
.docs-mode-section {
    padding: 80px 0;
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.docs-mode-section .section-header {
    margin-bottom: 48px;
}

.docs-mode-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.docs-mode-card {
    background: #fff;
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    border: 1.5px solid var(--border-color);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.docs-mode-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.docs-mode-card-blue { border-top: 3px solid #3370FF; }
.docs-mode-card-purple { border-top: 3px solid #7C3AED; }
.docs-mode-card-gray { border-top: 3px solid #6B7280; }

.docs-mode-card-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    margin-bottom: 18px;
}

.docs-mode-card-blue .docs-mode-card-icon { background: linear-gradient(135deg, #3370FF, #6366F1); }
.docs-mode-card-purple .docs-mode-card-icon { background: linear-gradient(135deg, #7C3AED, #4F46E5); }
.docs-mode-card-gray .docs-mode-card-icon { background: linear-gradient(135deg, #6B7280, #9CA3AF); }

.docs-mode-card h3 {
    font-size: 20px;
    color: var(--text-title);
    margin-bottom: 8px;
    font-weight: 700;
}

.docs-mode-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-light);
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    margin-bottom: 18px;
}

.docs-mode-list {
    list-style: none;
    padding: 0;
    margin: 0 0 18px;
    display: flex;
    flex-direction: column;
    gap: 9px;
}

.docs-mode-list li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 13.5px;
    color: var(--text-body);
    line-height: 1.5;
}

.docs-mode-list li i.ph-check {
    color: #16a34a;
    flex-shrink: 0;
    margin-top: 2px;
    font-size: 15px;
}

.docs-mode-list li i.ph-x {
    color: #dc2626;
    flex-shrink: 0;
    margin-top: 2px;
    font-size: 15px;
}

.docs-mode-recommend {
    font-size: 13px;
    color: var(--text-muted);
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    margin: 0;
    font-style: italic;
}

/* --- FAQ --- */
.docs-faq {
    padding: 80px 0;
    background: #fff;
}

.docs-faq .section-header {
    margin-bottom: 48px;
}

.docs-faq-grid {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.docs-faq-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-width: 0;
}

.docs-faq-item {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.docs-faq-item:hover { box-shadow: var(--shadow-sm); }

.docs-faq-item[open] {
    border-color: rgba(51, 112, 255, 0.24);
    box-shadow: var(--shadow-sm);
    background: #fff;
}

.docs-faq-item[open] summary { color: var(--brand-primary); }

.docs-faq-item summary {
    padding: 20px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-title);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    user-select: none;
    line-height: 1.4;
}

.docs-faq-item summary::-webkit-details-marker { display: none; }

.faq-arrow {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    transition: transform 0.3s ease;
    color: var(--text-muted);
    font-size: 16px;
}

.docs-faq-item[open] .faq-arrow { transform: rotate(180deg); }

.docs-faq-body {
    padding: 16px 24px 22px;
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.8;
    border-top: 1px solid var(--border-color);
}

.docs-faq-body p { margin-bottom: 10px; }
.docs-faq-body p:last-child { margin-bottom: 0; }
.docs-faq-body ul, .docs-faq-body ol { margin: 10px 0; padding-left: 20px; }
.docs-faq-body li { margin-bottom: 6px; }
.docs-faq-body strong { color: var(--text-title); }
.docs-faq-body code {
    background: rgba(51, 112, 255, 0.08);
    color: var(--brand-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12.5px;
    font-family: monospace;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .docs-mode-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
    .docs-hero-title { font-size: 36px; }
    .docs-hero-desc { font-size: 16px; }

    .overview-steps { flex-direction: column; gap: 28px; }
    .overview-connector { display: none; }
    .overview-step { flex-direction: row; text-align: left; gap: 18px; align-items: flex-start; padding: 0; }
    .overview-icon { margin-bottom: 0; flex-shrink: 0; }
    .overview-num { margin-bottom: 6px; }

    .docs-section { padding: 60px 0; }
    .docs-faq { padding: 60px 0; }
    .docs-overview { padding: 60px 0; }
    .docs-mode-section { padding: 60px 0; }

    .docs-tab { padding: 14px 16px; font-size: 13px; gap: 5px; }
    .docs-section-header { flex-direction: column; align-items: flex-start; gap: 12px; }

    .docs-mode-grid { grid-template-columns: 1fr; }
    .docs-mode-compare { grid-template-columns: 1fr; }

    .docs-faq-grid { flex-direction: column; }
    .docs-faq-col { flex: unset; width: 100%; }

    .docs-prerequisite { padding: 28px 24px; }
}

@media (max-width: 640px) {
    .docs-hero { padding-top: calc(var(--nav-height) + 48px); padding-bottom: 56px; }
    .docs-hero-title { font-size: 28px; }
    .docs-hero-desc { font-size: 15px; }

    .docs-step { gap: 16px; }
    .docs-step-num { width: 34px; height: 34px; font-size: 13px; }
    .docs-step-body h3 { font-size: 16px; }

    .client-tabs { gap: 8px; }
    .client-tab { padding: 7px 14px; font-size: 13px; }

    .docs-mode-card { padding: 24px 20px; }
}