/* ═══════════════════════════════════════════════════════════════
   LogiPlanner - User Guide · Light Mode
   Clean · Airy · Indigo-blue accent
   ═══════════════════════════════════════════════════════════════ */

:root {
    /* Surfaces */
    --ug-white:         #ffffff;
    --ug-bg:            #f8fafc;
    --ug-bg-sidebar:    #f1f5f9;
    --ug-border:        #e2e8f0;
    --ug-border-med:    #cbd5e1;

    /* Text */
    --ug-text:          #0f172a;
    --ug-text-sub:      #475569;
    --ug-text-muted:    #94a3b8;

    /* Accent - Indigo blue */
    --ug-accent:        #3b5bdb;
    --ug-accent-dark:   #2c44c9;
    --ug-accent-light:  #eef2ff;
    --ug-accent-border: #c5d0fc;

    /* Violet secondary */
    --ug-violet:        #7048e8;
    --ug-violet-light:  #f3f0fe;
    --ug-violet-border: #d9c9fd;

    /* Shadows */
    --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-shadow-modal:  0 24px 64px rgba(0,0,0,.14), 0 4px 20px rgba(0,0,0,.07), 0 0 0 1px rgba(0,0,0,.05);

    /* Radii */
    --ug-r-sm:  8px;
    --ug-r-md:  12px;
    --ug-r-lg:  16px;
    --ug-r-xl:  22px;

    /* Motion */
    --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%);
}

/* ── Topbar button ─────────────────────────────────────────── */
.topbar__guide-block { position: relative; }

.topbar__icon-btn--guide {
    transition: background var(--ug-dur-std) var(--ug-ease),
                transform var(--ug-dur-std) var(--ug-ease);
}

.topbar__icon-btn--guide:hover {
    background: var(--ug-accent-light);
    color: var(--ug-accent);
    transform: translateY(-1px);
}

/* ── Overlay ───────────────────────────────────────────────── */
.user-guide-overlay {
    position: fixed; inset: 0;
    background: rgba(15, 23, 42, 0.42);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 999999;
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
    animation: ugFadeIn var(--ug-dur-slow) var(--ug-ease);
}

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

/* ── Modal ─────────────────────────────────────────────────── */
.ug-modal {
    width: min(1020px, calc(100vw - 40px));
    height: min(720px, calc(100vh - 40px));
    display: flex;
    border-radius: var(--ug-r-xl);
    overflow: hidden;
    background: var(--ug-white);
    box-shadow: var(--ug-shadow-modal);
    animation: ugSlideIn var(--ug-dur-slow) var(--ug-ease);
}

@keyframes ugSlideIn {
    from { opacity:0; transform: scale(0.96) translateY(14px); }
    to   { opacity:1; transform: scale(1)    translateY(0);    }
}

/* ── Sidebar ───────────────────────────────────────────────── */
.ug-sidebar {
    width: 228px; flex-shrink: 0;
    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;
}

.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-label-sub { display: block; font-size: 0.72rem; color: var(--ug-text-muted); margin-top: 1px; }
.ug-nav-item.active .ug-nav-label-sub { color: var(--ug-accent); opacity: 0.75; }

.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; }
.ug-nav-item:hover .ug-nav-chevron { opacity: 0.45; transform: translateX(2px); }

/* ── Main panel ────────────────────────────────────────────── */
.ug-main {
    flex: 1; display: flex; flex-direction: column;
    background: var(--ug-white); min-width: 0;
}

.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);
}

.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; letter-spacing: -0.015em;
}

.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__close-btn {
    width: 32px; height: 32px; flex-shrink: 0; border-radius: var(--ug-r-sm);
    border: 1px solid var(--ug-border); background: var(--ug-bg);
    color: var(--ug-text-muted);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; transition: all var(--ug-dur-std) var(--ug-ease);
}

.ug-main__close-btn:hover {
    background: #fff1f2; border-color: #fca5a5; color: #dc2626;
    transform: scale(1.07);
}

/* ── Content area ──────────────────────────────────────────── */
.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); }

/* ── 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);
}

.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);
}

.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); }

/* ── Overview ──────────────────────────────────────────────── */
.ug-overview { animation: ugFadeUp var(--ug-dur-slow) var(--ug-ease); }

@keyframes ugFadeUp { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }

.ug-overview__hero {
    padding: 24px 28px; margin-bottom: 18px;
    border-radius: var(--ug-r-lg); background: var(--ug-grad-accent);
    position: relative; overflow: hidden;
}

.ug-overview__hero::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(ellipse at 90% -10%, rgba(255,255,255,.16) 0%, transparent 55%),
                radial-gradient(ellipse at 0% 110%, rgba(0,0,0,.10) 0%, transparent 50%);
    pointer-events: none;
}

.ug-overview__hero-title {
    font-size: 1.55rem; font-weight: 800; margin: 0 0 8px;
    letter-spacing: -0.02em; color: #fff; line-height: 1.2; position: relative;
}

.ug-overview__hero-desc {
    font-size: 0.88rem; color: rgba(255,255,255,.80);
    line-height: 1.65; margin: 0; max-width: 460px; position: relative;
}

.ug-overview__grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(198px, 1fr)); gap: 10px;
}

.ug-card {
    display: flex; flex-direction: column; gap: 10px;
    padding: 16px; border-radius: var(--ug-r-md);
    background: var(--ug-white); border: 1px solid var(--ug-border);
    cursor: pointer; transition: all var(--ug-dur-std) var(--ug-ease);
    text-align: left; box-shadow: var(--ug-shadow-xs);
}

.ug-card:hover {
    border-color: var(--ug-accent-border); box-shadow: var(--ug-shadow-md);
    transform: translateY(-2px);
}

.ug-card:active { transform: none; box-shadow: var(--ug-shadow-xs); }

.ug-card__icon-wrap {
    width: 38px; height: 38px; border-radius: var(--ug-r-sm);
    background: var(--ug-accent-light); border: 1px solid var(--ug-accent-border);
    display: flex; align-items: center; justify-content: center;
    transition: all var(--ug-dur-std);
}

.ug-card:hover .ug-card__icon-wrap { background: var(--ug-accent); border-color: var(--ug-accent); }

.ug-card__icon-wrap svg {
    width: 17px; height: 17px; stroke: var(--ug-accent); fill: none;
    stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
    transition: stroke var(--ug-dur-fast);
}

.ug-card:hover .ug-card__icon-wrap svg { stroke: #fff; }

.ug-card__body { flex: 1; }
.ug-card__title { font-size: 0.90rem; font-weight: 700; color: var(--ug-text); margin: 0 0 3px; }
.ug-card__sub { font-size: 0.77rem; color: var(--ug-text-muted); line-height: 1.4; margin: 0; }

.ug-card__arrow {
    align-self: flex-end; flex-shrink: 0;
    width: 16px; height: 16px; color: var(--ug-border-med);
    transition: color var(--ug-dur-fast), transform var(--ug-dur-std) var(--ug-ease);
}

.ug-card:hover .ug-card__arrow { color: var(--ug-accent); transform: translateX(3px); }

/* ── Detail view ───────────────────────────────────────────── */
.ug-detail { animation: ugFadeUp var(--ug-dur-std) var(--ug-ease); display: flex; flex-direction: column; gap: 18px; }

.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;
}

/* 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);
}

.ug-gallery__main {
    position: relative; overflow: hidden; aspect-ratio: 16/9; background: var(--ug-bg);
}

.ug-gallery__img {
    width: 100%; height: 100%; object-fit: cover; 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;
    box-shadow: var(--ug-shadow-xs);
}

.ug-gallery__thumbs {
    display: flex; gap: 6px; padding: 8px 10px; overflow-x: auto;
    background: var(--ug-bg); border-top: 1px solid var(--ug-border);
    scrollbar-width: none;
}
.ug-gallery__thumbs::-webkit-scrollbar { display: none; }

.ug-gallery__thumb {
    width: 70px; height: 44px; flex-shrink: 0; border-radius: 6px;
    object-fit: cover; border: 2px solid transparent;
    opacity: .48; cursor: pointer;
    transition: all var(--ug-dur-std) var(--ug-ease);
}

.ug-gallery__thumb:hover { opacity: .80; transform: scale(1.04); }

.ug-gallery__thumb.active {
    opacity: 1; border-color: var(--ug-accent);
    box-shadow: 0 0 0 3px var(--ug-accent-light);
}

/* Features */
.ug-features {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(192px, 1fr)); gap: 8px;
}

.ug-feature-item {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 12px 14px; border-radius: var(--ug-r-md);
    background: var(--ug-bg); border: 1px solid var(--ug-border);
    transition: all var(--ug-dur-std) var(--ug-ease);
}

.ug-feature-item:hover { background: var(--ug-white); box-shadow: var(--ug-shadow-sm); border-color: var(--ug-border-med); }

.ug-feature-icon {
    width: 28px; height: 28px; flex-shrink: 0; border-radius: var(--ug-r-sm);
    background: var(--ug-accent-light); border: 1px solid var(--ug-accent-border);
    display: flex; align-items: center; justify-content: center; margin-top: 1px;
}

.ug-feature-icon svg { width: 13px; height: 13px; stroke: var(--ug-accent); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.ug-feature-text strong { display: block; font-size: 0.83rem; font-weight: 700; color: var(--ug-text); margin-bottom: 2px; }
.ug-feature-text span { font-size: 0.76rem; color: var(--ug-text-muted); line-height: 1.4; }

/* Steps */
.ug-steps { display: flex; flex-direction: column; }

.ug-step { display: flex; gap: 12px; padding: 11px 0; position: relative; }

.ug-step:not(:last-child)::after {
    content: ''; position: absolute; left: 13px; top: 38px; bottom: 0;
    width: 1px; background: var(--ug-border);
}

.ug-step__num {
    width: 28px; height: 28px; flex-shrink: 0; border-radius: 50%;
    background: var(--ug-grad-accent); color: #fff;
    font-size: 0.73rem; font-weight: 800;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px rgba(59,91,219,.22); z-index: 1;
}

.ug-step__body { padding-top: 3px; }
.ug-step__title { font-size: 0.88rem; font-weight: 700; color: var(--ug-text); margin: 0 0 3px; }
.ug-step__desc { font-size: 0.81rem; color: var(--ug-text-sub); line-height: 1.55; margin: 0; }

/* Tip */
.ug-tip {
    display: flex; gap: 11px; padding: 13px 15px;
    border-radius: var(--ug-r-md);
    background: var(--ug-violet-light); border: 1px solid var(--ug-violet-border);
}

.ug-tip__icon {
    width: 26px; height: 26px; flex-shrink: 0; border-radius: var(--ug-r-sm);
    background: rgba(112,72,232,.10); display: flex; align-items: center; justify-content: center;
}

.ug-tip__icon svg { width: 13px; height: 13px; stroke: var(--ug-violet); fill: none; stroke-width: 2; }
.ug-tip__text { font-size: 0.83rem; color: #5b3fd0; line-height: 1.6; }
.ug-tip__text strong { color: var(--ug-violet); font-weight: 700; }

/* Section label */
.ug-detail-heading {
    font-size: 0.70rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--ug-text-muted); margin: 0 0 9px;
    display: flex; align-items: center; gap: 8px;
}
.ug-detail-heading::after { content: ''; flex: 1; height: 1px; background: var(--ug-border); }

/* Video */
.ug-video-wrap {
    position: relative; width: 100%; aspect-ratio: 16/9;
    border-radius: var(--ug-r-lg); overflow: hidden;
    background: var(--ug-bg); border: 1px solid var(--ug-border);
    box-shadow: var(--ug-shadow-sm);
}
.ug-video-wrap video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 800px) {
    .ug-sidebar { display: none; }
    .ug-modal { width: calc(100vw - 24px); height: calc(100vh - 24px); border-radius: var(--ug-r-lg); }
    .ug-main__content { padding: 18px 16px; }
    .ug-main__header, .ug-main__footer { padding: 12px 16px; }
    .ug-overview__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .ug-overview__grid, .ug-features { grid-template-columns: 1fr; }
    .ug-modal { border-radius: var(--ug-r-md); }
}