/* === Reset & Base === */
*,
*::before,
*::after {
    box-sizing: border-box;
}

:root {
    --color-primary: #c41e3a;
    --color-primary-dark: #9e1830;
    --color-accent: #c41e3a;
    --color-text: #1a1a1a;
    --color-text-muted: #4a4a4a;
    --color-bg: #f5f5f5;
    --color-bg-light: #ffffff;
    --color-border: #e0e0e0;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* === Typography === */
h1, h2, h3 {
    font-family: 'DM Serif Display', Georgia, serif;
    font-weight: 400;
    line-height: 1.2;
}

h1 {
    font-size: clamp(1.875rem, 4vw, 2.75rem);
    color: #000000;
    margin: 0 0 1rem;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: #000000;
    margin: 0 0 1.5rem;
}

h3 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin: 0 0 0.5rem;
}

p {
    margin: 0 0 1rem;
    color: var(--color-text-muted);
}

/* === Container === */
.container {
    width: 100%;
    max-width: 68rem;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* === Header === */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 3.75rem;
    width: auto;
    display: block;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 600;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--color-primary);
}

.header-phone {
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

@media (max-width: 52rem) {
    .header .container {
        flex-wrap: wrap;
    }
    .nav {
        order: 3;
        width: 100%;
        justify-content: center;
        gap: 1.5rem;
    }
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.2s;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
}

.btn-full {
    width: 100%;
}

/* === Hero === */
.hero {
    padding: 0.875rem 0 1rem;
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    color: white;
}

.hero-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.hero-left {
    max-width: 56rem;
    text-align: center;
}

.hero-right {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}


.hero h1 {
    font-size: clamp(1.75rem, 4.5vw, 2.5rem);
    color: #ffffff;
}

.hero-text {
    font-size: clamp(1.5rem, 3.5vw, 2.1rem);
    font-weight: 600;
    max-width: 100%;
    color: #ffffff;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.hero-side-title {
    font-family: 'DM Serif Display', Georgia, serif;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 400;
    color: #ffffff;
    margin: 0 0 1rem;
}

.hero-side-text {
    font-size: 1.125rem;
    color: #ffffff;
    line-height: 1.65;
    margin: 0;
}


.hero-cta {
    padding-top: 0.25rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.hero .btn-primary {
    background: var(--color-primary);
    color: #ffffff;
}

.hero .btn-primary:hover {
    background: var(--color-primary-dark);
}

.hero .btn-secondary {
    border-color: #ffffff;
    color: #ffffff;
}

.hero .btn-secondary:hover {
    background: #ffffff;
    color: #000000;
}

/* === Sections === */
.section {
    padding: 3.5rem 0;
}

.offer,
.benefits {
    background: var(--color-bg-light);
}

/* === Batteries Accordion === */
.batteries {
    background: var(--color-bg);
}

.batteries-intro {
    margin-bottom: 2rem;
}

.tab-brand {
    color: #0a3d62;
    font-weight: 600;
}

.hero .tab-brand {
    color: #5dade2;
}

.accordion {
    max-width: 48rem;
}

.accordion-item {
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    margin-bottom: 0.5rem;
    overflow: hidden;
    background: var(--color-bg-light);
}

.accordion-item:last-child {
    margin-bottom: 0;
}

.accordion-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1rem 1.25rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    color: #000000;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.accordion-trigger:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

.accordion-icon {
    display: block;
    width: 1rem;
    height: 1rem;
    margin-left: 0.75rem;
    flex-shrink: 0;
    position: relative;
}

.accordion-icon::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0.5rem;
    height: 0.5rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translate(-50%, -70%) rotate(45deg);
    transition: transform 0.25s;
}

.accordion-item .accordion-content.is-open + .accordion-trigger .accordion-icon::before,
.accordion-trigger[aria-expanded="true"] + .accordion-content ~ * .accordion-icon::before { /* not needed */
}

.accordion-trigger[aria-expanded="true"] .accordion-icon::before {
    transform: translate(-50%, -30%) rotate(-135deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.accordion-content.is-open {
    max-height: 1200px;
    overflow: visible;
}

.accordion-content-inner {
    overflow: visible;
}

.accordion-content-inner p {
    margin: 0;
    padding: 0 1.25rem 1rem 1.25rem;
    font-size: 0.9375rem;
}

.battery-row {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1rem 1.25rem;
}

.battery-row > div {
    flex: 1;
    min-width: 0;
}

.battery-row p {
    margin: 0 0 0.5rem;
    padding: 0;
}

.battery-row p:last-child {
    margin-bottom: 0;
}

.battery-advantages {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.battery-list {
    margin: 0 0 0.5rem;
    padding-left: 1.25rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.battery-list li {
    margin-bottom: 0.25rem;
}

.battery-img {
    width: 7rem;
    height: 10rem;
    object-fit: contain;
    object-position: center;
    border-radius: 0.375rem;
    flex-shrink: 0;
}

/* === Offer Grid === */
.offer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
    gap: 1.5rem;
}

.offer-card {
    padding: 1.75rem;
    background: var(--color-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--color-border);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.offer-card:hover {
    box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.08);
    border-color: var(--color-primary);
}

.offer-card p {
    margin: 0;
    font-size: 0.9375rem;
}

/* === Benefits === */
.benefits-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.benefits-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 1rem;
    color: var(--color-text-muted);
}

.benefits-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* === Contact === */
.contact {
    background: linear-gradient(180deg, var(--color-bg) 0%, #ebebeb 100%);
}

.contact-intro {
    margin-bottom: 2rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: stretch;
}

@media (max-width: 48rem) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-form-panel {
    align-self: stretch;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
}

.contact-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 0;
}

.contact-block-title {
    display: block;
    font-size: 1.125rem;
    font-weight: 700;
    color: #000000;
    margin-bottom: 0.75rem;
}

.contact-block {
    flex: 1;
    padding: 1rem;
    background: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
}

.contact-block .contact-name {
    display: block;
    color: #000000;
    font-weight: 500;
    margin-top: 1rem;
}

.contact-block .contact-name:first-child {
    margin-top: 0;
}

.contact-block .contact-value-link {
    display: block;
}

.contact-contact .contact-value-link {
    display: inline;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.contact-block .contact-value-link:hover {
    text-decoration: underline;
}

.contact-address {
    margin: 0;
    color: var(--color-text);
    line-height: 1.6;
}

.contact-item {
    display: block;
    padding: 0.75rem 1rem;
    background: var(--color-bg-light);
    border-radius: 0.375rem;
    text-decoration: none;
    color: var(--color-primary);
    font-weight: 500;
    border: 1px solid var(--color-border);
    transition: border-color 0.2s;
}

.contact-item:hover {
    border-color: var(--color-primary);
}

.contact-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: 0.25rem;
}

.contact-value {
    font-weight: 600;
    color: var(--color-primary);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 0.875rem 1rem;
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    background: var(--color-bg-light);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.contact-form textarea {
    resize: vertical;
    min-height: 6rem;
}

/* === Footer === */
.footer {
    padding: 1.5rem 0;
    background: #000000;
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
}

.footer p {
    margin: 0;
    font-size: 0.875rem;
}