/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "Amazon Ember", "Helvetica Neue", Roboto, Arial, sans-serif;
    background-color: #f2f3f3;
    color: #16191f;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header - Amazon style dark navbar */
header {
    background-color: #232f3e;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    border-bottom: 3px solid #ff9900;
}

.header-content {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.header-content h1 {
    font-size: 1.5rem;
    color: #ffffff;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    color: #aab7b8;
    font-size: 0.875rem;
}

/* Navigation bar */
.nav-bar {
    background-color: #37475a;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    overflow-x: auto;
}

.nav-link {
    color: #d5dbdb;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.75rem 1.25rem;
    border-bottom: 3px solid transparent;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.nav-link:hover {
    color: #ffffff;
    background-color: #425a73;
    border-bottom-color: #ff9900;
}

.nav-link.active {
    color: #ffffff;
    border-bottom-color: #ff9900;
    background-color: #425a73;
}

/* Main content */
main {
    flex: 1;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #16191f;
}

.page-subtitle {
    color: #545b64;
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

/* Regions grid */
.regions-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Region card - AWS console panel style */
.region-card {
    background-color: #ffffff;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #d5dbdb;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    transition: box-shadow 0.2s ease;
}

.region-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.region-header {
    background-color: #232f3e;
    padding: 0.875rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.75px;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.region-header::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 18px;
    background-color: #ff9900;
    border-radius: 2px;
}

/* Site list */
.site-list {
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

/* Site button - Amazon style */
.site-button {
    display: flex;
    align-items: center;
    padding: 0.7rem 1rem;
    background-color: #fafafa;
    border: 1px solid #d5dbdb;
    border-radius: 6px;
    color: #16191f;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.15s ease;
}

.site-button:hover {
    background-color: #ff9900;
    border-color: #ec7211;
    color: #ffffff;
    transform: translateX(4px);
}

.site-button:focus {
    outline: 2px solid #0073bb;
    outline-offset: 2px;
}

.site-button::before {
    content: '›';
    margin-right: 0.75rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: #879596;
    transition: color 0.15s ease;
}

.site-button:hover::before {
    color: #ffffff;
}

/* Content panels */
.content-panel {
    background-color: #ffffff;
    border: 1px solid #d5dbdb;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.panel-header {
    background-color: #fafafa;
    border-bottom: 1px solid #d5dbdb;
    padding: 1rem 1.5rem;
    font-weight: 700;
    font-size: 1rem;
    color: #16191f;
}

.panel-body {
    padding: 1.5rem;
    color: #545b64;
    line-height: 1.7;
}

.panel-body p {
    margin-bottom: 1rem;
}

.panel-body p:last-child {
    margin-bottom: 0;
}

/* Footer */
footer {
    background-color: #232f3e;
    padding: 1.25rem 2rem;
    text-align: center;
    color: #aab7b8;
    font-size: 0.8rem;
    border-top: 1px solid #37475a;
}

footer a {
    color: #ff9900;
    text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 0.25rem;
    }

    main {
        padding: 1.5rem 1rem;
    }

    .regions-container {
        grid-template-columns: 1fr;
    }
}

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