@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;700&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
    --bg-primary: #0A0A0A;
    --bg-secondary: #121212;
    --accent: #FF6B00;
    --text-main: #F2F2F2;
    --text-muted: #888888;
    --border-color: #2A2A2A;
    --surface: #1A1A1A;

    --font-display: 'Space Grotesk', sans-serif;
    --font-technical: 'JetBrains Mono', monospace;

    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-mechanical: 0.3s steps(4, end);
}

/* Base Reset & Core Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: var(--font-display);
    line-height: 1.6;
    font-size: 16px;
    /* Enforce 16px to prevent auto-zoom on mobile inputs */
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
    text-transform: uppercase;
    letter-spacing: -0.02em;
    font-weight: 700;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

/* Technical typography utility */
.tech-text {
    font-family: var(--font-technical);
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--accent);
}

/* Layout Elements */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 100px 100px;
    opacity: 0.05;
    pointer-events: none;
    z-index: 1000;
}

.section-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    /* Reduced for mobile comfort */
}

@media (min-width: 768px) {
    .section-container {
        padding: 0 40px;
    }
}

/* Responsive Grids */
.grid-stack {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
}

@media (min-width: 768px) {
    .grid-md-2 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-md-3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .grid-md-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 1200px) {
    .grid-lg-3 {
        grid-template-columns: repeat(3, 1fr);
    }

    .grid-lg-4 {
        grid-template-columns: repeat(4, 1fr);
    }
}

.flex-stack {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

@media (min-width: 992px) {
    .flex-stack {
        flex-direction: row;
        align-items: center;
    }

    .flex-stack>div {
        flex: 1;
    }
}

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 2px solid var(--accent);
    padding: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

@media (min-width: 768px) {
    .cookie-banner {
        bottom: 24px;
        left: 24px;
        right: 24px;
        border: 1px solid var(--accent);
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.cookie-content {
    flex: 1;
}

/* Components */
.btn-mechanical {
    display: inline-block;
    padding: 16px 32px;
    background-color: var(--accent);
    color: var(--bg-primary);
    font-family: var(--font-technical);
    font-weight: 700;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-mechanical:hover {
    background-color: var(--text-main);
    color: var(--bg-primary);
}

.btn-neon {
    background-color: #39FF14 !important;
    /* Neon Green for CRO */
    color: #000000 !important;
    font-weight: 800 !important;
    box-shadow: 0 0 20px rgba(57, 255, 20, 0.3);
}

.btn-neon:hover {
    background-color: #32D711 !important;
    box-shadow: 0 0 30px rgba(57, 255, 20, 0.5);
    transform: translateY(-2px);
}

.card-utilitarian {
    background: var(--surface);
    border: 1px solid var(--border-color);
    padding: 32px;
    position: relative;
}

.hover-accent:hover {
    background: rgba(255, 107, 0, 0.15) !important;
    border-color: var(--accent) !important;
    transform: translateX(8px);
}

.card-utilitarian::before {
    content: "ID://" attr(data-id);
    position: absolute;
    top: 12px;
    right: 12px;
    font-family: var(--font-technical);
    font-size: 10px;
    color: var(--text-muted);
}

/* Distinctive Header */
.header-main {
    border-bottom: 4px solid var(--accent);
    padding: 24px 0;
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    z-index: 100;
}

.nav-link-tech {
    font-family: var(--font-technical);
    font-size: 0.9rem;
    margin-left: 32px;
    opacity: 0.7;
}

.nav-link-tech:hover {
    opacity: 1;
    color: var(--accent);
}

/* --- MOBILE-FIRST NAVIGATION SYSTEM --- */
/* Target Viewport: 390px (iPhone 12/13/14) */

/* 1. Bottom Navigation Bar (Thumb Zone Optimization) */
.nav-mobile-bottom {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(5, 5, 5, 0.9);
    /* Darker for better contrast */
    backdrop-filter: blur(20px);
    /* Stronger glassmorphism */
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 12px 0 calc(12px + env(safe-area-inset-bottom));
    /* Increased padding */
    z-index: 2000;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.8);
}

.nav-mobile-bottom .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--text-muted);
    text-decoration: none;
    min-width: 64px;
    /* Apple HIG / MD3 Touch Target */
    min-height: 48px;
    padding: 8px 0;
    /* Add internal breathing room */
    flex: 1;
    transition: var(--transition-fast);
}

.nav-mobile-bottom .nav-item i {
    font-size: 1.25rem;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.nav-mobile-bottom .nav-item span {
    font-family: var(--font-technical);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-mobile-bottom .nav-item.active,
.nav-mobile-bottom .nav-item:active {
    color: var(--accent);
}

.nav-mobile-bottom .nav-item.active i {
    transform: translateY(-2px);
}

/* Android / Chrome Mobile Fixes */
@supports (-webkit-tap-highlight-color: transparent) {
    .nav-mobile-bottom .nav-item {
        -webkit-tap-highlight-color: transparent;
    }
}

/* Ensure touch targets meet Android standards (48px+) */
.btn-mechanical,
.nav-item,
.tech-accordion-header,
.tech-input {
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-mobile-bottom .nav-item {
    min-height: 64px;
    /* Slightly taller for Android comfort */
}

/* 2. Floating Quick Action (Thumb Area) */
.fab-whatsapp {
    position: fixed;
    bottom: calc(85px + env(safe-area-inset-bottom));
    left: 20px;
    width: 56px;
    height: 56px;
    background: #25D366;
    color: #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.75rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 2000;
    transition: var(--transition-fast);
}

@media (min-width: 768px) {
    .fab-whatsapp {
        bottom: 20px;
    }
}

.fab-whatsapp:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(37, 211, 102, 0.4);
}

.fab-index {
    position: fixed;
    bottom: calc(85px + env(safe-area-inset-bottom));
    right: 20px;
    width: 56px;
    height: 56px;
    background: var(--accent);
    color: var(--bg-primary);
    border-radius: 16px;
    /* Material Design 3 Shape */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 20px rgba(255, 107, 0, 0.4);
    z-index: 1999;
    border: none;
    cursor: pointer;
}

/* 3. Progressive Enhancement (Desktop Fixes) */
@media (max-width: 767px) {
    body {
        padding-bottom: 80px;
        /* Space for bottom nav */
    }

    .header-main .logo {
        transform: scale(0.9);
        transform-origin: left center;
    }

    /* Mobile Hero Layout (< 768px) */
    .hero-grid-industrial {
        display: flex;
        flex-direction: column;
        gap: 24px;
        position: relative;
        z-index: 2;
    }

    .hero-image {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0.25;
        /* Slightly increased for better 'feel' */
        z-index: 0;
        filter: grayscale(1) brightness(0.45);
        background-size: cover;
        background-position: center;
    }
}

@media (min-width: 768px) {

    .nav-mobile-bottom,
    .fab-index {
        display: none !important;
    }

    .hero-grid-industrial {
        display: grid;
        grid-template-columns: 1.1fr 0.9fr;
        /* Adjusted for better balance on tablets */
        align-items: center;
        gap: 40px;
    }

    .hero-image {
        position: relative !important;
        width: 100% !important;
        height: 480px !important;
        /* Slightly more compact for tablets */
        opacity: 1 !important;
        z-index: 1 !important;
        filter: none !important;
        border: 1px solid var(--border-color);
        background-size: cover;
        background-position: center;
    }

    .hero-image::after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, var(--bg-primary) 0%, transparent 25%);
    }
}

@media (min-width: 1200px) {
    .hero-grid-industrial {
        grid-template-columns: 1.2fr 0.8fr;
        gap: 80px;
    }

    .hero-image {
        height: 520px !important;
    }
}

/* Global Overflow Fixes */
html,
body {
    max-width: 100vw;
    overflow-x: hidden;
    position: relative;
}

/* Specific Hero Image Container for Battery Lab */
.hero-image-container {
    flex: 1;
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0.2;
    z-index: 1;
    mask-image: linear-gradient(to left, black 80%, transparent);
    -webkit-mask-image: linear-gradient(to left, black 80%, transparent);
}

@media (min-width: 992px) {
    .hero-image-container {
        width: 50%;
        opacity: 1;
        position: absolute;
    }
}

/* Redesign Components: Product / Kit Cards */
.kit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.kit-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.kit-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.kit-card .card-image {
    height: 200px;
    background-size: cover;
    background-position: center;
    border-bottom: 1px solid var(--border-color);
}

.kit-card .card-content {
    padding: 24px;
}

.kit-card .price-tag {
    font-family: var(--font-technical);
    font-size: 1.5rem;
    color: var(--accent);
    margin: 16px 0;
}

/* Redesign Components: FAQ Accordion */
.tech-accordion {
    margin-top: 64px;
}

.tech-accordion-item {
    border: 1px solid var(--border-color);
    margin-bottom: 16px;
    background: var(--bg-secondary);
}

.tech-accordion-header {
    padding: 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.tech-accordion-header:hover {
    background: var(--surface);
}

.tech-accordion-title {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 1rem;
}

.tech-accordion-content {
    padding: 0 24px 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
    display: none;
}

.tech-accordion-item.active .tech-accordion-content {
    display: block;
}

.tech-accordion-item.active .tech-accordion-header {
    color: var(--accent);
}

/* Redesign Components: Forms */
.tech-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.tech-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tech-input-group label {
    font-family: var(--font-technical);
    font-size: 0.7rem;
    color: var(--text-muted);
}

.tech-input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 16px;
    color: var(--text-main);
    font-family: var(--font-display);
    transition: var(--transition-fast);
}

.tech-input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--surface);
}

/* Badges & Labels */
.badge-tech {
    display: inline-block;
    padding: 4px 8px;
    background: var(--border-color);
    color: var(--text-muted);
    font-family: var(--font-technical);
    font-size: 0.6rem;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.badge-tech.accent {
    background: var(--accent);
    color: var(--bg-primary);
}

/* Technical Index Overlay (Refactored to Off-Canvas) */
.index-overlay {
    position: fixed;
    top: 0;
    right: 0;
    /* Align to side for Off-Canvas */
    width: 85%;
    /* Responsive off-canvas width */
    max-width: 400px;
    height: 100%;
    background: var(--bg-primary);
    z-index: 2100;
    padding: 80px 32px;
    overflow-y: auto;
    border-left: 2px solid var(--accent);
    transform: translateX(105%);
    /* Hidden by default */
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: -20px 0 50px rgba(0, 0, 0, 0.8);
}

.index-overlay.active {
    transform: translateX(0);
}

/* Backdrop for Off-Canvas context */
.index-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 2050;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease;
}

.index-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.index-grid {
    display: flex;
    flex-direction: column;
    /* Vertical flow for mobile off-canvas */
    gap: 40px;
    margin-top: 40px;
}

.index-column h5 {
    font-family: var(--font-technical);
    color: var(--accent);
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    font-size: 0.8rem;
}

.index-list {
    list-style: none;
    padding: 0;
}

.index-list li {
    margin-bottom: 16px;
}

.index-list a {
    font-size: 1.1rem;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.index-list a:hover {
    color: var(--text-main);
    padding-left: 8px;
    border-left: 2px solid var(--accent);
}

.close-index {
    position: absolute;
    top: 40px;
    right: 40px;
    cursor: pointer;
    font-family: var(--font-technical);
    font-size: 0.8rem;
    color: var(--accent);
}

.btn-index-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 16px;
    font-family: var(--font-technical);
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-index-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Product Technical Page Styles */
.product-hero-tech {
    padding: 160px 0 80px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to bottom, var(--bg-primary), var(--bg-secondary));
}

.spec-matrix {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    margin: 48px 0;
}

.spec-item {
    background: var(--bg-primary);
    padding: 24px;
}

.spec-label {
    display: block;
    font-family: var(--font-technical);
    font-size: 0.65rem;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.spec-value {
    font-size: 1.1rem;
    font-weight: 700;
}

.tech-data-sheet {
    background: var(--surface);
    border: 1px solid var(--border-color);
    padding: 40px;
}

.data-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.data-row:last-child {
    border-bottom: none;
}

.data-label {
    font-family: var(--font-technical);
    color: var(--text-muted);
}

.data-value {
    color: var(--text-main);
}

.compatibility-badge {
    display: inline-block;
    padding: 4px 12px;
    background: #1a1a1a;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-family: var(--font-technical);
    font-size: 0.7rem;
    margin-right: 8px;
    margin-bottom: 8px;
}

/* Battery Lab Specific Styles */
.lab-report-header {
    border-left: 8px solid var(--accent);
    padding-left: 32px;
    margin-bottom: 64px;
}

.cell-health-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 4px;
    margin: 24px 0;
}

.cell-unit {
    aspect-ratio: 1;
    background: var(--border-color);
    border-radius: 2px;
    position: relative;
    width: 100%;
    height: 20px;
    /* Fixed height for better rendering consistency */
}

.cell-unit.active {
    background: var(--accent);
    box-shadow: 0 0 10px rgba(255, 107, 0, 0.3);
}

.cell-unit::after {
    content: "";
    position: absolute;
    top: -2px;
    left: 25%;
    width: 50%;
    height: 2px;
    background: inherit;
    border-radius: 1px 1px 0 0;
}

.diagnostic-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 32px;
    position: relative;
    overflow: hidden;
}

.diagnostic-card::before {
    content: "DIAG_CODE: " attr(data-code);
    position: absolute;
    top: 12px;
    right: -30px;
    background: var(--accent);
    color: var(--bg-primary);
    font-family: var(--font-technical);
    font-size: 9px;
    font-weight: 700;
    padding: 2px 40px;
    transform: rotate(45deg);
}

.voltage-matrix {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 40px 0;
}

.voltage-card {
    background: var(--surface);
    border-top: 4px solid var(--border-color);
    padding: 32px;
    transition: var(--transition-fast);
    cursor: pointer;
}

.voltage-card:hover {
    border-top-color: var(--accent);
    transform: translateY(-5px);
}

.status-ticker {
    font-family: var(--font-technical);
    font-size: 0.7rem;
    color: #00FF41;
    /* Terminal Green */
    background: rgba(0, 255, 65, 0.05);
    padding: 4px 8px;
    display: inline-block;
}

/* Footer & Layout Utilities */
.footer-main {
    padding: 64px 0;
    border-top: 4px solid var(--border-color);
    background: var(--bg-primary);
    margin-bottom: 80px;
    /* Space for mobile nav */
}

@media (min-width: 768px) {
    .footer-main {
        margin-bottom: 0;
    }
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 48px;
    }
}

.footer-column {
    display: flex;
    flex-direction: column;
}

.coverage-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 16px;
}

.text-md-right {
    text-align: left;
}

@media (min-width: 768px) {
    .text-md-right {
        text-align: right !important;
    }
}

/* Technical Spacing & Display Utilities (Bootstrap Independent) */
.d-none {
    display: none !important;
}

.d-flex {
    display: flex !important;
}

@media (min-width: 768px) {
    .d-md-none {
        display: none !important;
    }

    .d-md-flex {
        display: flex !important;
    }

    .d-md-block {
        display: block !important;
    }
}

.text-center {
    text-align: center !important;
}

.text-right {
    text-align: right !important;
}

/* Responsive Gaps */
.gap-2 {
    gap: 8px;
}

.gap-3 {
    gap: 16px;
}

.gap-4 {
    gap: 24px;
}

.mt-1 {
    margin-top: 4px !important;
}

.mt-2 {
    margin-top: 8px !important;
}

.mt-3 {
    margin-top: 16px !important;
}

.mt-4 {
    margin-top: 24px !important;
}

.mt-5 {
    margin-top: 48px !important;
}

.mb-1 {
    margin-bottom: 4px !important;
}

.mb-2 {
    margin-bottom: 8px !important;
}

.mb-3 {
    margin-bottom: 16px !important;
}

.mb-4 {
    margin-bottom: 24px !important;
}

.mb-5 {
    margin-bottom: 48px !important;
}