/* CSS for BMW Showcase */

/* Variables de Color */
:root {
    --primary-blue: #003366; /* Azul oscuro BMW */
    --accent-gray: #b0b0b0; /* Gris metalico */
    --light-gray: #f4f4f4;
    --pure-white: #ffffff;
    --deep-black: #1a1a1a;
    --transition-speed: 0.3s;
}

/* Reset y Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--deep-black);
    background-color: var(--pure-white);
    scroll-behavior: smooth;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navbar */
.header {
    background-color: var(--primary-blue);
    color: var(--pure-white);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    letter-spacing: 2px;
}

.nav-list {
    display: flex;
    list-style: none;
}

.nav-link {
    color: var(--pure-white);
    text-decoration: none;
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: color var(--transition-speed);
}

.nav-link:hover {
    color: var(--accent-gray);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--pure-white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 51, 102, 0.7), rgba(0, 51, 102, 0.7)), url('https://images.unsplash.com/photo-1555215695-3004980ad54e?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--pure-white);
    margin-top: 60px;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.cta-button {
    background-color: var(--pure-white);
    color: var(--primary-blue);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
}

.cta-button:hover {
    background-color: var(--accent-gray);
    transform: scale(1.05);
}

/* Sections Common */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-blue);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--accent-gray);
    margin: 10px auto 0;
}

/* Models Grid */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.model-card {
    background-color: var(--light-gray);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform var(--transition-speed);
}

.model-card:hover {
    transform: translateY(-10px);
}

.placeholder-image {
    height: 200px;
    background-color: var(--accent-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--primary-blue);
}

.model-info {
    padding: 20px;
}

.model-info h3 {
    margin-bottom: 10px;
    color: var(--primary-blue);
}

.modelo-desc {
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.specs {
    margin-bottom: 15px;
}

.spec {
    display: block;
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 5px;
}

.spec-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: bold;
}

/* Timeline History */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--primary-blue);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 25px;
    right: -17px;
    background-color: var(--pure-white);
    border: 4px solid var(--accent-gray);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    text-align: right;
}

.timeline-item:nth-child(even)::after {
    left: -16px;
}

.timeline-date {
    font-weight: bold;
    color: var(--primary-blue);
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.timeline-content {
    padding: 20px;
    background-color: var(--light-gray);
    border-radius: 6px;
}

/* Innovation Grid */
.innovation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    text-align: center;
}

.innovation-card {
    padding: 30px;
    background-color: var(--primary-blue);
    color: var(--pure-white);
    border-radius: 10px;
    transition: transform var(--transition-speed);
}

.innovation-card:hover {
    transform: scale(1.05);
    background-color: #004080;
}

.innovation-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--light-gray);
    padding: 40px;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.submit-btn {
    background-color: var(--primary-blue);
    color: var(--pure-white);
    border: none;
    padding: 12px 25px;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    border-radius: 4px;
    transition: background-color var(--transition-speed);
}

.submit-btn:hover {
    background-color: #004080;
}

.form-message {
    text-align: center;
    margin-top: 15px;
    font-weight: bold;
}

/* Footer */
.footer {
    background-color: var(--deep-black);
    color: var(--accent-gray);
    padding: 40px 0;
    text-align: center;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-list {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: var(--primary-blue);
        text-align: center;
    }

    .nav-list.active {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .timeline::before {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
        text-align: left !important;
    }

    .timeline-item::after {
        left: 18px;
    }
}