/* ============================================
   Bottom Navigation - Стилизованный нижний бар
   ============================================ */

/* Контейнер навигации */
#bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    justify-content: space-around;
    align-items: center;
    /* Glassmorphism - liquid glass effect */
    background: rgba(15, 17, 26, 0.22);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 8px;
    padding-bottom: max(8px, env(safe-area-inset-bottom, 8px));
    min-height: 60px;
    box-sizing: border-box;
}

/* Слайдер-индикатор */
#nav-slider {
    position: absolute;
    top: 8px;
    left: 5px;
    width: calc(16.666% - 10px);
    height: calc(100% - 16px - env(safe-area-inset-bottom, 0px));
    background: linear-gradient(to bottom, #ffffff 0%, #e8e8e8 100%);
    border-radius: 12px;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
    z-index: 0;
    box-shadow:
        0 4px 14px rgba(0, 0, 0, 0.28),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        inset 0 -1px 0 rgba(0, 0, 0, 0.08);
    pointer-events: none;
    will-change: transform;
    overflow: hidden;
}

/* Эффект электрических искр поверх слайдера */
#nav-slider::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 60'%3E%3Cdefs%3E%3Cfilter id='glow'%3E%3CfeGaussianBlur stdDeviation='1' result='blur'/%3E%3CfeMerge%3E%3CfeMergeNode in='blur'/%3E%3CfeMergeNode in='SourceGraphic'/%3E%3C/feMerge%3E%3C/filter%3E%3C/defs%3E%3Cg filter='url(%23glow)' stroke='%23ef4444' stroke-width='1.5' fill='none' stroke-linecap='round' opacity='0.7'%3E%3Cpath d='M5 30 L15 25 L12 32 L25 28 L20 35 L35 30'/%3E%3Cpath d='M65 25 L75 30 L70 28 L85 32 L78 27 L95 30'/%3E%3Cpath d='M40 15 L45 20 L42 18 L50 22'/%3E%3Cpath d='M50 45 L58 40 L55 43 L65 38'/%3E%3Ccircle cx='18' cy='28' r='1.5' fill='%23ef4444' stroke='none'/%3E%3Ccircle cx='75' cy='32' r='1.5' fill='%23ef4444' stroke='none'/%3E%3Ccircle cx='45' cy='20' r='1' fill='%23fca5a5' stroke='none'/%3E%3Ccircle cx='60' cy='42' r='1' fill='%23fca5a5' stroke='none'/%3E%3Ccircle cx='30' cy='30' r='0.8' fill='%23ffffff' stroke='none'/%3E%3Ccircle cx='82' cy='28' r='0.8' fill='%23ffffff' stroke='none'/%3E%3C/g%3E%3C/svg%3E") center/cover no-repeat;
    border-radius: 12px;
    pointer-events: none;
    mix-blend-mode: multiply;
    opacity: 0.9;
}

/* Позиции слайдера для 6 вкладок */
#nav-slider[data-position="0"] {
    transform: translateX(0);
}

#nav-slider[data-position="1"] {
    transform: translateX(calc((100vw - 10px) / 6));
}

#nav-slider[data-position="2"] {
    transform: translateX(calc((100vw - 10px) / 6 * 2));
}

#nav-slider[data-position="3"] {
    transform: translateX(calc((100vw - 10px) / 6 * 3));
}

#nav-slider[data-position="4"] {
    transform: translateX(calc((100vw - 10px) / 6 * 4));
}

#nav-slider[data-position="5"] {
    transform: translateX(calc((100vw - 10px) / 6 * 5));
}

/* Позиции для 7 вкладок (с админкой) */
#bottom-nav.has-admin #nav-slider {
    width: calc(14.285% - 10px);
}

#bottom-nav.has-admin #nav-slider[data-position="0"] {
    transform: translateX(0);
}

#bottom-nav.has-admin #nav-slider[data-position="1"] {
    transform: translateX(calc((100vw - 10px) / 7));
}

#bottom-nav.has-admin #nav-slider[data-position="2"] {
    transform: translateX(calc((100vw - 10px) / 7 * 2));
}

#bottom-nav.has-admin #nav-slider[data-position="3"] {
    transform: translateX(calc((100vw - 10px) / 7 * 3));
}

#bottom-nav.has-admin #nav-slider[data-position="4"] {
    transform: translateX(calc((100vw - 10px) / 7 * 4));
}

#bottom-nav.has-admin #nav-slider[data-position="5"] {
    transform: translateX(calc((100vw - 10px) / 7 * 5));
}

#bottom-nav.has-admin #nav-slider[data-position="6"] {
    transform: translateX(calc((100vw - 10px) / 7 * 6));
}

/* Кнопки навигации */
.nav-btn {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: #888;
    font-size: 0.8rem;
    padding: 0.5rem;
    cursor: pointer;
    flex: 1;
    min-width: 0;
    transition: all 0.3s ease;
    -webkit-tap-highlight-color: transparent;
}

.nav-btn .nav-text,
.nav-btn .nav-icon {
    transition: all 0.3s ease;
}

.nav-btn .nav-icon {
    position: absolute;
    font-size: 1.5rem;
    opacity: 0;
    transform: translateY(10px);
}

/* Активная кнопка — текст скрыт, эмодзи видно */
.nav-btn.active {
    color: #1a1a1a;
    transform: translateY(-5px);
}

.nav-btn.active .nav-text {
    opacity: 0;
    transform: translateY(-10px);
}

.nav-btn.active .nav-icon {
    opacity: 1;
    transform: translateY(0);
}

/* ================== АДАПТИВНОСТЬ ================== */

/* Android: фиксированный отступ */
html[data-platform="android"] #bottom-nav {
    padding-bottom: 12px;
}

/* iOS: учитываем safe area */
html[data-platform="ios"] #bottom-nav {
    padding-bottom: max(8px, env(safe-area-inset-bottom));
}

/* Маленькие экраны */
@media (max-width: 360px) {
    .nav-btn {
        font-size: 0.75rem;
        padding: 0.4rem;
    }

    .nav-btn .nav-icon {
        font-size: 1.3rem;
    }
}

/* ================== LOCKED NAV ITEMS ================== */
.nav-btn.nav-locked {
    opacity: 0.5;
    pointer-events: auto;
}

.nav-btn.nav-locked .nav-text {
    color: #666;
}

.nav-lock {
    position: absolute;
    top: -2px;
    right: 2px;
    font-size: 0.6rem;
    z-index: 2;
}