:root {
    --primary-color: #0a6ed1;
    --secondary-color: #354a5f;
    --accent-color: #f0ab00;
    --bg-color: #f5f7fa;
    --white: #ffffff;
    --text-color: #32363a;
    --light-gray: #eef2f5;
    --border-color: #d1d9e0;
    --font-family: '72', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header & Nav */
header {
    background-color: var(--white);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo span {
    color: var(--secondary-color);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.3s;
}

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

/* Language Switcher */
.lang-switch {
    margin-left: 1rem;
}

.lang-switch select {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text-color);
    background-color: var(--white);
    cursor: pointer;
    transition: border-color 0.3s;
}

.lang-switch select:hover {
    border-color: var(--primary-color);
}

.lang-switch select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(10, 110, 209, 0.1);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 2rem;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background-color: var(--white);
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    font-weight: bold;
    border-radius: 4px;
    transition: transform 0.2s, box-shadow 0.2s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    flex: 1;
}

/* Sections */
.section-title {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Use Cases / Services */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.card p {
    color: #555;
    font-size: 0.95rem;
}

/* Contact Form */
.contact-form {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
}

.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(10, 110, 209, 0.1);
}

.radio-group {
    display: flex;
    gap: 1.5rem;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 2rem;
    text-align: center;
    margin-top: auto;
}

footer a {
    color: var(--light-gray);
    text-decoration: none;
}

/* Lists */
.doc-list {
    list-style: none;
    padding: 0;
}

.doc-list li {
    background: var(--white);
    margin-bottom: 0.5rem;
    padding: 1rem;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid var(--primary-color);
}

.doc-list li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
}

.doc-list li a:hover {
    color: var(--primary-color);
}

.tag {
    background: var(--light-gray);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    color: #666;
}

/* Story collapse (hidden by default) */
.story-header {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
.story-header .toggle-icon {
    display: inline-block;
    transform: rotate(0deg);
    transition: transform 0.18s ease;
    color: var(--primary-color);
    font-size: 0.95rem;
    line-height: 1;
}
.story-header[aria-expanded="true"] .toggle-icon {
    transform: rotate(90deg);
}
.story-content.collapsed { display: none; }
.story-item .story-content { margin-top: 0.75rem; }
.epic-header { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.epic-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    padding: 0.28rem 0.6rem;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: pointer;
}
.story-item.open { box-shadow: 0 1px 4px rgba(0,0,0,0.03); }

/* Responsive nav (mobile) */
.nav-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--primary-color);
}
.nav-toggle:focus { outline: none; box-shadow: 0 0 0 3px rgba(10,110,209,0.12); border-radius: 4px; }

@media (max-width: 768px) {
    nav {
        padding: 0.5rem 1rem;
        /* Position relative removed so nav-links positions relative to header */
    }
    .nav-toggle {
        display: block;
    }
    .nav-links {
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        display: none;
        border-top: 1px solid var(--light-gray);
        z-index: 999;
        width: 100%;
    }
    .nav-links.show {
        display: flex;
    }
    .nav-links li {
        padding: 0.8rem 1rem;
        border-bottom: 1px solid var(--light-gray);
    }
    .nav-links li a {
        display: block;
        width: 100%;
    }
    .lang-switch {
        margin-left: 0;
        padding: 0.75rem 1rem 1rem 1rem;
    }
}