/* ===================== ÁÀÇÎÂÛÅ ÏÅÐÅÌÅÍÍÛÅ ===================== */
:root {
    /* ÖÂÅÒÀ - ÑÂÅÒËÀß ÒÅÌÀ */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #212529;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #868e96;
    --accent-blue: #0066cc;
    --accent-dark: #0052a3;
    /* ÒÅÍÈ */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    /* ÃÐÀÍÈÖÛ */
    --border-light: #dee2e6;
    --border-medium: #ced4da;
    /* ÔÎÍÛ */
    --bg-primary: var(--white);
    --bg-secondary: var(--light-gray);
    --bg-card: var(--white);
    --bg-navbar: var(--white); /* ÍÎÂÀß ÏÅÐÅÌÅÍÍÀß ÄËß ÍÀÂÁÀÐÀ */
}

[data-theme="dark"] {
    /* ÖÂÅÒÀ - Ò¨ÌÍÀß ÒÅÌÀ */
    --white: #0a0a0a;
    --light-gray: #1a1a1a;
    --medium-gray: #2a2a2a;
    --dark-gray: #f8f9fa;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --accent-blue: #339af0;
    --accent-dark: #1c7ed6;
    /* ÒÅÍÈ */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.36);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.48);
    /* ÃÐÀÍÈÖÛ */
    --border-light: #2d2d2d;
    --border-medium: #3d3d3d;
    /* ÔÎÍÛ */
    --bg-primary: var(--white);
    --bg-secondary: var(--light-gray);
    --bg-card: var(--light-gray);
    --bg-navbar: var(--white); /* ÍÀÂÁÀÐ ÒÎÃÎ ÆÅ ÖÂÅÒÀ, ×ÒÎ È ÎÑÍÎÂÍÎÉ ÔÎÍ */
}

/* ===================== ÁÀÇÎÂÛÅ ÑÒÈËÈ ===================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===================== ÒÈÏÎÃÐÀÔÈß ===================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p, .lead {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.125rem;
    font-weight: 400;
}

/* ===================== ÊÍÎÏÊÈ ===================== */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: 1px solid transparent;
    transition: var(--transition);
    font-size: 0.875rem;
    letter-spacing: 0.01em;
    text-transform: none;
}

.btn-primary {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

    .btn-primary:hover {
        background-color: var(--accent-dark);
        border-color: var(--accent-dark);
        transform: translateY(-1px);
        box-shadow: var(--shadow-md);
    }

.btn-outline-primary {
    background-color: transparent;
    border-color: var(--border-medium);
    color: var(--text-primary);
}

    .btn-outline-primary:hover {
        border-color: var(--accent-blue);
        color: var(--accent-blue);
        background-color: rgba(0, 102, 204, 0.04);
    }

/* ÊÍÎÏÊÀ ÏÅÐÅÊËÞ×ÅÍÈß ÒÅÌÛ */
.btn-theme-toggle {
    background: transparent;
    border: 1px solid var(--border-medium);
    border-radius: 20px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition);
}

    .btn-theme-toggle:hover {
        border-color: var(--accent-blue);
        color: var(--accent-blue);
        transform: rotate(15deg);
    }

    .btn-theme-toggle i {
        font-size: 1.25rem;
        transition: transform 0.3s ease;
    }

    .btn-theme-toggle:hover i {
        transform: scale(1.1);
    }

/* ===================== HEADER (ÎÁÙÈÅ ÑÒÈËÈ) ===================== */
header {
    background-color: var(--bg-navbar); /* ÈÑÏÎËÜÇÓÅÌ ÏÅÐÅÌÅÍÍÓÞ ÄËß ÍÀÂÁÀÐÀ */
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.navbar {
    padding: 1rem 0;
    background-color: transparent !important; /* ÓÁÅÄÈÒÅÑÜ, ×ÒÎ ÍÅÒ ÄÎÏÎËÍÈÒÅËÜÍÛÕ ÔÎÍÎÂ */
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: var(--transition);
    position: relative;
}

    .nav-link:hover,
    .nav-link.active {
        color: var(--accent-blue) !important;
    }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 1rem;
            right: 1rem;
            height: 2px;
            background-color: var(--accent-blue);
            border-radius: 2px;
        }

/* ÂÛÏÀÄÀÞÙÅÅ ÌÅÍÞ ÏÎËÜÇÎÂÀÒÅËß ÍÀ ÏÊ */
.nav-item.dropdown .dropdown-menu {
    background-color: var(--bg-navbar);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 0.5rem;
    margin-top: 0.5rem;
}

.dropdown-item {
    color: var(--text-primary);
    padding: 0.625rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
}

    .dropdown-item:hover,
    .dropdown-item:focus {
        background-color: rgba(0, 102, 204, 0.1);
        color: var(--accent-blue);
    }

.dropdown-divider {
    border-color: var(--border-light);
    margin: 0.5rem 0;
}

/* ÈÑÏÐÀÂËÅÍÈÅ ÄËß ÊÍÎÏÊÈ ÂÛÕÎÄÀ */
.dropdown-item form button {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: inherit;
    padding: 0;
    font: inherit;
    cursor: pointer;
}

/* ===================== FOOTER ===================== */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: 3rem 0 2rem;
    margin-top: 4rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

    footer h5 {
        color: var(--text-primary);
        font-weight: 600;
        font-size: 0.875rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        margin-bottom: 1.25rem;
    }

    footer a {
        color: var(--text-secondary);
        text-decoration: none;
        transition: var(--transition);
        display: inline-block;
        margin-bottom: 0.5rem;
    }

        footer a:hover {
            color: var(--accent-blue);
        }

/* ===================== ÓÒÈËÈÒÛ ===================== */
.badge {
    font-weight: 500;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    letter-spacing: 0.02em;
}

.text-muted {
    color: var(--text-muted) !important;
}

.bg-white {
    background-color: var(--bg-card) !important;
}

.bg-light {
    background-color: var(--bg-secondary) !important;
}

.border {
    border-color: var(--border-light) !important;
}

.border-light {
    border-color: var(--border-light) !important;
}

/* ===================== ÏËÀÂÍÛÅ ÏÅÐÅÕÎÄÛ ===================== */
.theme-transition * {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease !important;
}

/* ===================== ÌÎÁÈËÜÍÀß ÀÄÀÏÒÀÖÈß ===================== */

/* Ïëàíøåòû è íåáîëüøèå ýêðàíû */
@media (max-width: 992px) {
    .navbar {
        padding: 0.75rem 0;
    }

    .navbar-brand {
        font-size: 1.3rem;
    }

        .navbar-brand .fs-4 {
            font-size: 1.2rem !important;
        }
}

/* Ìîáèëüíûå óñòðîéñòâà */
@media (max-width: 768px) {
    /* Îáùèå ñòèëè äëÿ ìîáèëüíûõ */
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    /* HEADER äëÿ ìîáèëüíûõ */
    header {
        position: sticky;
        top: 0;
        z-index: 1030;
        padding: 0;
    }

    .navbar {
        padding: 0.75rem 0;
    }

    .navbar-brand {
        font-size: 1.25rem;
        padding: 0.25rem 0;
    }

        .navbar-brand span.fs-4 {
            font-size: 1.1rem !important;
        }

    /* Óëó÷øåííàÿ êíîïêà áóðãåð-ìåíþ */
    .navbar-toggler {
        padding: 0.5rem;
        border: 1px solid var(--border-light);
        border-radius: 8px;
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        background-color: var(--bg-navbar);
        transition: var(--transition);
    }

        .navbar-toggler:hover {
            border-color: var(--accent-blue);
            background-color: rgba(0, 102, 204, 0.05);
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.25);
            outline: none;
        }

        .navbar-toggler i {
            font-size: 1.5rem;
            color: var(--text-primary);
        }

    /* Ðàñêðûâàþùååñÿ ìåíþ */
    .navbar-collapse {
        background-color: var(--bg-navbar);
        border-radius: 12px;
        box-shadow: var(--shadow-lg);
        margin-top: 1rem;
        padding: 1rem;
        border: 1px solid var(--border-light);
        max-height: 80vh;
        overflow-y: auto;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        z-index: 1000;
    }

    /* Óëó÷øåííàÿ íàâèãàöèÿ äëÿ ìîáèëüíûõ */
    .navbar-nav {
        gap: 0.25rem;
        width: 100%;
    }

    .nav-item {
        border-bottom: 1px solid var(--border-light);
        padding: 0.5rem 0;
        width: 100%;
    }

        .nav-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

    .nav-link {
        padding: 0.875rem 1rem !important;
        border-radius: 8px;
        display: flex;
        align-items: center;
        font-size: 1rem;
        width: 100%;
        min-height: 48px;
    }

        .nav-link:hover,
        .nav-link.active {
            background-color: rgba(0, 102, 204, 0.1);
        }

            .nav-link.active::after {
                display: none;
            }

        /* Èêîíêè â íàâèãàöèè */
        .nav-link i {
            min-width: 24px;
            text-align: center;
        }

        /* Êîðçèíà íà ìîáèëüíûõ */
        .nav-link .bi-cart3 {
            font-size: 1.25rem;
        }

    .cart-count {
        margin-left: 0.5rem !important;
        font-size: 0.75rem;
        padding: 0.25rem 0.5rem;
    }

    /* Âûïàäàþùåå ìåíþ ïîëüçîâàòåëÿ */
    .nav-item.dropdown {
        border-bottom: none;
    }

    .dropdown-toggle {
        justify-content: space-between;
        width: 100%;
    }

        .dropdown-toggle::after {
            margin-left: auto;
            transition: transform 0.2s ease;
        }

    .show .dropdown-toggle::after {
        transform: rotate(180deg);
    }

    .dropdown-menu {
        position: static !important;
        float: none !important;
        width: 100% !important;
        margin: 0.5rem 0 0 0 !important;
        padding: 0.5rem;
        border: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
        background-color: var(--bg-navbar);
        border-radius: 8px;
    }

    .dropdown-item {
        padding: 0.75rem 1rem;
        color: var(--text-primary);
        border-radius: 6px;
        margin: 0.125rem 0;
        font-size: 0.95rem;
    }

        .dropdown-item:hover {
            background-color: rgba(0, 102, 204, 0.1);
            color: var(--accent-blue);
        }

    .dropdown-divider {
        border-color: var(--border-light);
        margin: 0.5rem 0;
    }

    /* Êíîïêà ïåðåêëþ÷åíèÿ òåìû */
    .btn-theme-toggle {
        width: 44px;
        height: 44px;
        margin-left: 0.5rem;
        flex-shrink: 0;
    }

    /* Èñïðàâëåíèå îòñòóïîâ íà ìîáèëüíûõ */
    .nav-item.ms-3,
    .nav-item.ms-2 {
        margin-left: 0 !important;
    }

    .navbar-nav .ms-auto {
        margin-left: 0 !important;
    }

    /* Ôîðìà âûõîäà */
    .dropdown-item form {
        margin: 0;
    }

    .dropdown-item button {
        width: 100%;
        text-align: left;
        background: none;
        border: none;
        color: inherit;
        padding: 0;
        font: inherit;
        cursor: pointer;
    }

    /* FOOTER íà ìîáèëüíûõ */
    footer {
        padding: 2rem 0 1.5rem;
        margin-top: 3rem;
    }

        footer .row {
            gap: 2rem 0;
        }

        footer h5 {
            font-size: 0.875rem;
            margin-bottom: 1rem;
        }

        footer .border-top {
            margin-top: 2rem;
            padding-top: 1.5rem;
        }
}

/* Ìàëåíüêèå ìîáèëüíûå óñòðîéñòâà */
@media (max-width: 576px) {
    .navbar {
        padding: 0.5rem 0;
    }

    .navbar-brand {
        font-size: 1.1rem;
    }

        .navbar-brand .bi-lightning-charge-fill {
            font-size: 1rem;
            margin-right: 0.5rem;
        }

    .navbar-toggler {
        width: 40px;
        height: 40px;
        padding: 0.375rem;
    }

        .navbar-toggler i {
            font-size: 1.25rem;
        }

    .navbar-collapse {
        padding: 0.875rem;
        margin-top: 0.75rem;
        border-radius: 10px;
    }

    .nav-link {
        padding: 0.75rem 0.875rem !important;
        font-size: 0.95rem;
        min-height: 44px;
    }

    .nav-item {
        padding: 0.375rem 0;
    }

    .btn-theme-toggle {
        width: 40px;
        height: 40px;
    }

        .btn-theme-toggle i {
            font-size: 1.1rem;
        }

    .dropdown-menu {
        padding: 0.375rem;
    }

    .dropdown-item {
        padding: 0.625rem 0.875rem;
        font-size: 0.9rem;
    }

    .cart-count {
        font-size: 0.7rem;
        padding: 0.2rem 0.4rem;
    }
}

/* Î÷åíü ìàëåíüêèå ýêðàíû */
@media (max-width: 375px) {
    .navbar-brand {
        font-size: 1rem;
    }

        .navbar-brand span.fs-4 {
            font-size: 1rem !important;
        }

    .navbar-toggler {
        width: 36px;
        height: 36px;
    }

    .nav-link {
        font-size: 0.9rem;
        padding: 0.625rem 0.75rem !important;
    }

        .nav-link i {
            font-size: 0.9rem;
        }

    .btn-theme-toggle {
        width: 36px;
        height: 36px;
    }
}

/* ===================== Ò¨ÌÍÀß ÒÅÌÀ ÍÀ ÌÎÁÈËÜÍÛÕ ===================== */
[data-theme="dark"] .navbar-collapse {
    background-color: var(--bg-navbar);
    border-color: var(--border-medium);
}

[data-theme="dark"] .nav-item {
    border-color: var(--border-medium);
}

[data-theme="dark"] .dropdown-menu {
    background-color: var(--bg-navbar);
    border-color: var(--border-medium);
}

[data-theme="dark"] .navbar-toggler {
    border-color: var(--border-medium);
    background-color: var(--bg-navbar);
}

    [data-theme="dark"] .navbar-toggler:hover {
        border-color: var(--accent-blue);
        background-color: rgba(51, 154, 240, 0.1);
    }

/* ===================== ÀÍÈÌÀÖÈÈ ÌÅÍÞ ===================== */
.navbar-collapse.collapsing {
    transition: height 0.3s ease, opacity 0.3s ease;
}

.navbar-collapse.show {
    animation: slideDownFade 0.3s ease;
}

@keyframes slideDownFade {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

/* ===================== iOS ÑÀÔÀÐÈ ÎÑÎÁÅÍÍÎÑÒÈ ===================== */
@supports (-webkit-touch-callout: none) {
    .navbar-collapse {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }

    .nav-link,
    .dropdown-item,
    .btn-theme-toggle {
        -webkit-tap-highlight-color: rgba(0, 102, 204, 0.1);
    }

    .navbar-toggler {
        cursor: pointer;
    }
}

/* ===================== ÄÎÑÒÓÏÍÎÑÒÜ ===================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .navbar-collapse.collapsing {
        transition: none;
    }

    .navbar-collapse.show {
        animation: none;
    }
}

/* Ôîêóñ äëÿ äîñòóïíîñòè */
.nav-link:focus,
.btn-theme-toggle:focus,
.dropdown-item:focus,
.navbar-toggler:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Âûñîêîêîíòðàñòíûé ðåæèì */
@media (prefers-contrast: high) {
    :root {
        --accent-blue: #004080;
        --accent-dark: #00264d;
    }

    [data-theme="dark"] {
        --accent-blue: #66b3ff;
        --accent-dark: #3399ff;
    }

    .nav-link.active {
        text-decoration: underline;
        text-decoration-thickness: 2px;
    }
}