:root {
    --bg-deep: #030712;
    --old-glory-red: #DC2626;
    --pure-white: #FFFFFF;
    --gold: #F59E0B;
    --glass-bg: rgba(3, 7, 18, 0.85);
    --border-glow: rgba(245, 158, 11, 0.3);
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-deep);
    color: var(--pure-white);
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.cinematic-vignette {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
    background: radial-gradient(circle at center, transparent 40%, rgba(3, 7, 18, 0.9) 90%);
}

.ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 2rem;
    box-sizing: border-box;
}

header {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glow);
    border-top: 3px solid var(--old-glory-red);
    padding: 1.25rem 2rem;
    border-radius: 12px;
    pointer-events: auto;
    max-width: 580px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
}

header h1 {
    margin: 0 0 0.3rem 0;
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: var(--pure-white);
    text-transform: uppercase;
}

header p {
    margin: 0 0 0.8rem 0;
    color: #94A3B8;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
}

nav {
    display: flex;
    gap: 1.5rem;
}

nav a {
    color: var(--gold);
    text-decoration: none;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    border-bottom: 2px solid transparent;
    padding-bottom: 0.2rem;
    transition: all 0.3s ease;
}

nav a:hover {
    color: var(--pure-white);
    border-color: var(--old-glory-red);
}

.capital-label {
    position: absolute;
    color: #FFFFFF;
    font-size: 11px;
    font-weight: 700;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.9), 0 0 12px rgba(245, 158, 11, 0.5);
    pointer-events: auto;
    cursor: pointer;
    transform: translate(-50%, -50%);
    white-space: nowrap;
    transition: transform 0.2s ease, color 0.2s ease;
}

.capital-label:hover {
    color: var(--gold);
    transform: translate(-50%, -50%) scale(1.15);
}

/* State Resource Popup Modal */
.state-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glow);
    border-top: 4px solid var(--old-glory-red);
    padding: 2rem;
    border-radius: 16px;
    z-index: 100;
    width: 90%;
    max-width: 480px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.9), 0 0 40px rgba(245, 158, 11, 0.2);
    display: none;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: auto;
}

.state-modal.active {
    display: block;
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.state-modal h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
    color: var(--pure-white);
    text-transform: uppercase;
}

.state-modal h3 {
    margin: 0 0 1rem 0;
    font-size: 0.9rem;
    color: var(--gold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.state-modal p {
    color: #CBD5E1;
    font-size: 0.85rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

.resource-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.resource-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--pure-white);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

.resource-btn:hover {
    background: var(--gold);
    color: #030712;
    border-color: var(--gold);
}

.close-modal {
    background: var(--old-glory-red);
    color: var(--pure-white);
    border: none;
    width: 100%;
    padding: 0.75rem;
    border-radius: 8px;
    font-weight: 700;
    text-transform: uppercase;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: opacity 0.2s ease;
}

.close-modal:hover {
    opacity: 0.85;
}

.hud-footer {
    display: flex;
    justify-content: flex-end;
    pointer-events: auto;
}

.fps-counter {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-glow);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--gold);
}