/* ═══════════════════════════════════════════════════════════════
   LogiPlanner - User Guide Pages · Modal Style
   ═══════════════════════════════════════════════════════════════ */

:root {
    --ug-white:         #ffffff;
    --ug-bg:            #f8fafc;
    --ug-bg-sidebar:    #f1f5f9;
    --ug-border:        #e2e8f0;
    --ug-border-med:    #cbd5e1;
    --ug-text:          #0f172a;
    --ug-text-sub:      #475569;
    --ug-text-muted:    #94a3b8;
    --ug-accent:        #3b5bdb;
    --ug-accent-dark:   #2c44c9;
    --ug-accent-light:  #eef2ff;
    --ug-accent-border: #c5d0fc;
    --ug-violet:        #7048e8;
    --ug-violet-light:  #f3f0fe;
    --ug-shadow-xs:     0 1px 3px rgba(0,0,0,.05), 0 1px 2px rgba(0,0,0,.04);
    --ug-shadow-sm:     0 2px 8px rgba(0,0,0,.07), 0 1px 3px rgba(0,0,0,.04);
    --ug-shadow-md:     0 4px 20px rgba(0,0,0,.09), 0 2px 6px rgba(0,0,0,.05);
    --ug-r-sm:  8px;
    --ug-r-md:  12px;
    --ug-r-lg:  16px;
    --ug-ease:      cubic-bezier(0.22, 1, 0.36, 1);
    --ug-dur-fast:  140ms;
    --ug-dur-std:   210ms;
    --ug-dur-slow:  330ms;
    --ug-grad-accent: linear-gradient(135deg, #3b5bdb 0%, #7048e8 100%);
}

/* ── Main page wrapper ───────────────────────────────────── */
.ug-page-wrapper {
    display: flex;
    height: 100vh;
    background: var(--ug-bg);
}

/* ── Sidebar ───────────────────────────────────────────── */
.ug-page-sidebar {
    width: 228px;
    background: var(--ug-bg-sidebar);
    border-right: 1px solid var(--ug-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.ug-sidebar__brand {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 20px 16px 16px;
    border-bottom: 1px solid var(--ug-border);
}

.ug-sidebar__brand svg {
    stroke: var(--ug-accent);
    flex-shrink: 0;
}

.ug-sidebar__brand-text {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--ug-text-sub);
}

.ug-sidebar__nav {
    flex: 1;
    overflow-y: auto;
    padding: 10px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    scrollbar-width: none;
}

.ug-sidebar__nav::-webkit-scrollbar {
    display: none;
}

.ug-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 11px;
    border-radius: var(--ug-r-sm);
    border: 1px solid transparent;
    background: transparent;
    color: var(--ug-text-sub);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--ug-dur-std) var(--ug-ease);
    text-align: left;
    width: 100%;
    position: relative;
    text-decoration: none;
}

.ug-nav-item:hover {
    background: var(--ug-white);
    border-color: var(--ug-border);
    color: var(--ug-text);
    box-shadow: var(--ug-shadow-xs);
    transform: translateX(2px);
}

.ug-nav-item.active {
    background: var(--ug-accent-light);
    border-color: var(--ug-accent-border);
    color: var(--ug-accent);
}

.ug-nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 22%;
    bottom: 22%;
    width: 3px;
    border-radius: 0 3px 3px 0;
    background: var(--ug-accent);
}

.ug-nav-icon {
    width: 30px;
    height: 30px;
    flex-shrink: 0;
    border-radius: var(--ug-r-sm);
    background: var(--ug-white);
    border: 1px solid var(--ug-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--ug-dur-std);
}

.ug-nav-item.active .ug-nav-icon {
    background: var(--ug-accent);
    border-color: var(--ug-accent);
}

.ug-nav-item:hover:not(.active) .ug-nav-icon {
    border-color: var(--ug-accent-border);
    background: var(--ug-accent-light);
}

.ug-nav-icon svg {
    width: 14px;
    height: 14px;
    stroke: var(--ug-text-muted);
    fill: none;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: stroke var(--ug-dur-fast);
}

.ug-nav-item.active .ug-nav-icon svg {
    stroke: #fff;
}

.ug-nav-item:hover:not(.active) .ug-nav-icon svg {
    stroke: var(--ug-accent);
}

.ug-nav-label {
    flex: 1;
    line-height: 1.3;
    min-width: 0;
}

.ug-nav-label-title {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
}

.ug-nav-chevron {
    opacity: 0;
    color: var(--ug-accent);
    flex-shrink: 0;
    transition: opacity var(--ug-dur-fast), transform var(--ug-dur-std) var(--ug-ease);
}

.ug-nav-item.active .ug-nav-chevron {
    opacity: 1;
}

/* ── Main content area ────────────────────────────────── */
.ug-page-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--ug-white);
    overflow: hidden;
}

.ug-main__header {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 22px;
    border-bottom: 1px solid var(--ug-border);
}

.ug-main__back-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px 6px 8px;
    border-radius: var(--ug-r-sm);
    border: 1px solid var(--ug-border);
    background: var(--ug-bg);
    color: var(--ug-text-sub);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all var(--ug-dur-std) var(--ug-ease);
    text-decoration: none;
}

.ug-main__back-btn:hover {
    background: var(--ug-accent-light);
    border-color: var(--ug-accent-border);
    color: var(--ug-accent);
    transform: translateX(-2px);
}

.ug-main__header-center {
    flex: 1;
    min-width: 0;
}

.ug-main__title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--ug-text);
    line-height: 1.2;
}

.ug-main__subtitle {
    margin: 2px 0 0;
    font-size: 0.79rem;
    color: var(--ug-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ug-main__content {
    flex: 1;
    overflow-y: auto;
    padding: 22px 26px;
    scrollbar-width: thin;
    scrollbar-color: var(--ug-border) transparent;
}

.ug-main__content::-webkit-scrollbar {
    width: 4px;
}

.ug-main__content::-webkit-scrollbar-track {
    background: transparent;
}

.ug-main__content::-webkit-scrollbar-thumb {
    background: var(--ug-border);
    border-radius: 4px;
}

.ug-main__content::-webkit-scrollbar-thumb:hover {
    background: var(--ug-border-med);
}

/* ── Detail view ───────────────────────────────────── */
.ug-detail__lead {
    padding: 14px 18px;
    border-radius: var(--ug-r-md);
    background: var(--ug-accent-light);
    border: 1px solid var(--ug-accent-border);
    border-left: 3px solid var(--ug-accent);
    font-size: 0.90rem;
    color: var(--ug-text-sub);
    line-height: 1.7;
    margin-bottom: 18px;
}

.ug-detail {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.ug-detail section h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--ug-text);
    margin: 0 0 12px 0;
}

.ug-detail section h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #1f2937;
    margin: 16px 0 10px 0;
}

.ug-detail section p {
    margin: 0 0 12px 0;
    color: var(--ug-text-sub);
    line-height: 1.65;
}

.ug-detail section ul,
.ug-detail section ol {
    margin: 0 0 12px 0;
    padding-left: 24px;
    color: var(--ug-text-sub);
}

.ug-detail section li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.ug-detail section strong {
    color: var(--ug-text);
    font-weight: 600;
}

/* ── Gallery ───────────────────────────────────────── */
.ug-gallery {
    border-radius: var(--ug-r-lg);
    overflow: hidden;
    border: 1px solid var(--ug-border);
    box-shadow: var(--ug-shadow-sm);
    background: var(--ug-bg);
    margin: 16px 0;
}

.ug-gallery__main {
    position: relative;
    overflow: hidden;
    height: clamp(240px, 48vh, 560px);
    background: var(--ug-bg);
}

.ug-gallery__img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    transition: opacity .22s ease, transform .5s var(--ug-ease);
}

.ug-gallery__img.switching {
    opacity: 0;
    transform: scale(1.015);
}

.ug-gallery__count {
    position: absolute;
    bottom: 10px;
    right: 12px;
    padding: 3px 9px;
    border-radius: 99px;
    background: rgba(255,255,255,.90);
    backdrop-filter: blur(4px);
    color: var(--ug-text-sub);
    font-size: 0.71rem;
    font-weight: 600;
    border: 1px solid var(--ug-border);
    pointer-events: none;
}

/* ── Footer ────────────────────────────────────────── */
.ug-main__footer {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 11px 22px;
    border-top: 1px solid var(--ug-border);
    background: var(--ug-bg);
    min-height: 54px;
}

.ug-footer__progress {
    font-size: 0.78rem;
    color: var(--ug-text-muted);
    font-weight: 500;
}

.ug-footer__actions {
    display: flex;
    gap: 8px;
}

.ug-footer__prev-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 14px;
    border-radius: var(--ug-r-sm);
    border: 1px solid var(--ug-border);
    background: var(--ug-white);
    color: var(--ug-text-sub);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--ug-dur-std) var(--ug-ease);
    text-decoration: none;
}

.ug-footer__prev-btn:hover {
    background: var(--ug-bg);
    border-color: var(--ug-border-med);
    color: var(--ug-text);
}

.ug-footer__next-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 18px;
    border-radius: var(--ug-r-sm);
    border: none;
    background: var(--ug-grad-accent);
    color: #fff;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(59,91,219,.28);
    transition: all var(--ug-dur-std) var(--ug-ease);
    text-decoration: none;
}

.ug-footer__next-btn:hover {
    transform: translateY(-1px);
    filter: brightness(1.06);
    box-shadow: 0 4px 16px rgba(59,91,219,.38);
}

.ug-footer__next-btn:active {
    transform: none;
    filter: brightness(0.98);
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 1024px) {
    .ug-page-sidebar {
        width: 200px;
    }
}

@media (max-width: 768px) {
    .ug-page-wrapper {
        flex-direction: column;
        height: calc(100vh - 66px);
        height: calc(100dvh - 66px);
    }

    .ug-page-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--ug-border);
        max-height: 200px;
    }

    .ug-sidebar__nav {
        flex-direction: row;
        padding: 10px;
        gap: 10px;
        overflow-x: auto;
    }

    .ug-nav-item {
        padding: 6px 12px;
        flex-shrink: 0;
    }

    .ug-main__content {
        padding: 14px;
    }

    .ug-main__header {
        padding: 12px 14px;
        gap: 8px;
    }

    .ug-main__back-btn {
        padding: 6px 10px 6px 6px;
        font-size: 0.78rem;
    }

    .ug-main__footer {
        padding: 10px 14px calc(10px + env(safe-area-inset-bottom, 0px));
    }

    .ug-gallery__main {
        height: clamp(190px, 40vh, 380px);
    }

    .ug-main__title {
        font-size: 1rem;
    }

    .ug-main__subtitle {
        display: none;
    }
}

@media (max-width: 480px) {
    .ug-page-wrapper {
        height: calc(100svh - 66px);
    }

    .ug-main__content {
        padding: 12px;
    }

    .ug-main__header {
        padding: 10px 12px;
    }

    .ug-page-main .ug-main__content .ug-detail section h3,
    .user-guide-detail .guide-section h3 {
        grid-template-columns: 28px minmax(0, 1fr) !important;
        gap: 8px !important;
        padding: 11px 12px 8px !important;
    }

    .ug-page-main .ug-main__content .ug-detail section h3 + p,
    .user-guide-detail .guide-section h3 + p {
        padding: 0 12px 12px 48px !important;
    }

    .ug-page-main .ug-main__content .ug-detail section li,
    .user-guide-detail .guide-section li {
        padding: 10px 12px 10px 42px !important;
    }

    .ug-page-main .ug-main__content .ug-detail section ul li::before,
    .user-guide-detail .guide-section ul li::before {
        left: 16px;
        top: 17px;
    }

    .ug-page-main .ug-main__content .ug-detail section ol li::before,
    .user-guide-detail .guide-section ol li::before {
        left: 10px;
    }

    .ug-page-main .ug-main__content .ug-detail section li:not(:last-child)::after,
    .user-guide-detail .guide-section li:not(:last-child)::after {
        left: 21px;
    }
}

/* Help Center detail pages should open directly into the guide content.
   The feature list already lives on the main Help Center page. */
.ug-page-wrapper {
    flex: 1;
    width: 100%;
    min-width: 0;
}

.ug-page-sidebar {
    display: none !important;
}

.ug-page-main {
    width: 100%;
    min-width: 0;
}