:root {
    --bg-white: #FFFFFF;
    --text-black: #0E121A;
    --race-red: #E31E24;
    --acc-gray: #F2F2F7;
    --transition: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
    --bg-white: #0E121A;
    --text-black: #FFFFFF;
    --acc-gray: #1C1C1E;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Mulish', sans-serif;
    background-color: var(--bg-white);
    color: var(--text-black);
    transition: background-color var(--transition), color var(--transition);
    line-height: 1.6;
}

h1, h2, h3, h4 {
    margin-bottom: 15px;
    line-height: 1.2;
}

header {
    position: sticky;
    top: 0;
    background-color: var(--bg-white);
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    z-index: 9999;
    width: 100%;
    height: 90px;
    display: flex;
    align-items: center;
    transition: background-color var(--transition), box-shadow var(--transition);
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 50px;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    height: 100%;
}

.text-logo {
    font-family: 'Kanit', sans-serif;
    font-weight: 900;
    font-size: 2.2rem;
    color: #FF0000;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    white-space: nowrap;
    user-select: none;
    cursor: pointer;
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-black);
    margin: 0 20px;
    font-weight: 700;
    font-size: 1.1rem;
    position: relative;
    transition: color 0.3s;
    height: 100%;
    display: flex;
    align-items: center;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 20px;
    left: 0;
    width: 0%;
    height: 3px;
    background-color: var(--race-red);
    transition: width 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--race-red);
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.nav-controls {
    display: flex;
    align-items: center;
    z-index: 10001;
}

.highbeam-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999999;
    transition: color 0.3s ease, filter 0.3s ease;
    padding: 8px;
    border-radius: 50%;
}

.highbeam-toggle:hover {
    background-color: rgba(0,0,0,0.05);
}

[data-theme="dark"] .highbeam-toggle:hover {
    background-color: rgba(255,255,255,0.05);
}

.highbeam-toggle svg {
    pointer-events: none;
    display: block;
}

[data-theme="dark"] .highbeam-toggle {
    color: #007AFF;
    filter: drop-shadow(0 0 10px rgba(0, 122, 255, 1));
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    margin-left: 20px;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background-color: var(--text-black);
    margin: 4px 0;
    transition: 0.4s;
    border-radius: 2px;
}

[data-theme="dark"] .hamburger span {
    background-color: #FF0000;
}

@media screen and (max-width: 900px) {
    nav {
        padding: 0 20px;
    }

    .text-logo {
        font-size: 1.6rem;
        z-index: 10001;
    }

    .hamburger {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 90px;
        left: 0;
        width: 100%;
        height: auto;
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: center;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        transform: translateY(-150%);
        transition: transform 0.4s ease-in-out, opacity 0.4s ease-in-out;
        z-index: 9998;
        padding: 20px 0;
        opacity: 0;
        pointer-events: none;
        border-bottom: 2px solid var(--race-red);
    }

    [data-theme="dark"] .nav-links {
        box-shadow: 0 10px 15px rgba(0,0,0,0.5);
    }

    .nav-links.nav-active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links a {
        margin: 15px 0;
        font-size: 1.3rem;
        height: auto;
    }

    .nav-links a::after {
        display: none;
    }
}

.hero {
    height: 70vh;
    background-color: #0E121A;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    position: relative;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(14, 18, 26, 0.6);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 20px;
}

.hero-content h1 {
    font-size: 3.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.card {
    background: var(--acc-gray);
    padding: 30px 30px 60px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform var(--transition), background-color var(--transition);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    border-bottom: 4px solid var(--race-red);
}

.card img {
    margin-bottom: 20px;
    object-fit: cover;
}

.card .price {
    margin-top: auto;
    font-weight: 900;
    color: var(--race-red);
    font-size: 1.2rem;
    padding-top: 15px;
}

.btn-cta {
    background-color: var(--race-red);
    color: #fff;
    padding: 12px 25px;
    text-decoration: none;
    font-weight: 900;
    border-radius: 5px;
    display: inline-block;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    text-align: center;
}

.btn-cta:hover {
    background-color: #c11219;
    transform: scale(1.02);
}

.contact-strip {
    background-color: var(--acc-gray);
    text-align: center;
    padding: 60px 20px;
    border-top: 1px solid rgba(0,0,0,0.1);
    transition: background-color var(--transition);
}

[data-theme="dark"] .contact-strip {
    border-top: 1px solid rgba(255,255,255,0.1);
}

.contact-strip .btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.slider-container {
    position: relative;
    overflow: hidden;
}

.slider-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 15px;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.slide.active {
    display: block;
}

.slider-controls {
    position: absolute;
    top: 100px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 10px;
    z-index: 10;
    pointer-events: none;
}

.slider-controls button {
    pointer-events: auto;
    background: rgba(0,0,0,0.5);
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 50%;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-top: 20px;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(14, 18, 26, 0.8);
    backdrop-filter: blur(5px);
    z-index: 100000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 12px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease, background-color var(--transition);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    border-top: 5px solid var(--race-red);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-black);
    line-height: 1;
    transition: color 0.3s;
}

.close-modal:hover {
    color: var(--race-red);
}

.modal-content h2 {
    font-family: 'Kanit', sans-serif;
    margin-bottom: 15px;
    font-size: 2rem;
}

.modal-content p {
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.modal-btns {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.modal-btns .btn-cta {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
}

.email-btn {
    background-color: var(--text-black);
}

[data-theme="dark"] .email-btn {
    background-color: #333;
}

.email-btn:hover {
    background-color: #000;
}