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

:root {
    --bg: #0b0e17;
    --panel: rgba(12, 16, 28, 0.92);
    --border: rgba(60, 80, 120, 0.3);
    --hl: #4fc3f7;
    --hl2: #ab47bc;
    --danger: #ef5350;
    --text: #ccd6e6;
    --dim: #6b7a99;
    --success: #66bb6a;
    --warn: #ffa726;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#world {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

/* === Top Bar === */
#topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 48px;
    background: var(--panel);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 20px;
    z-index: 100;
    gap: 30px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-icon { font-size: 1.3rem; }
.brand-text { font-weight: 700; font-size: 0.95rem; letter-spacing: 3px; }
.hl { color: var(--hl); }

.era-display, .time-display {
    display: flex;
    align-items: center;
    gap: 8px;
}

.era-label, .year-label {
    font-size: 0.65rem;
    letter-spacing: 2px;
    color: var(--dim);
    text-transform: uppercase;
}

.era-name {
    color: var(--hl);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 1px;
}

.year-value {
    color: var(--warn);
    font-weight: 700;
    font-size: 1rem;
    font-variant-numeric: tabular-nums;
}

/* === Panels === */
#controls, #stats {
    position: fixed;
    top: 58px;
    width: 220px;
    background: var(--panel);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    z-index: 90;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--dim) transparent;
}

#controls { left: 12px; }
#stats { right: 12px; }

.panel-title {
    font-size: 0.7rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--hl);
    margin-bottom: 10px;
}

/* Controls */
.ctrl-btn {
    width: 100%;
    padding: 9px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(255,255,255,0.04);
    color: var(--text);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 6px;
    transition: all 0.2s;
}

.ctrl-btn:hover:not(:disabled) {
    background: rgba(255,255,255,0.08);
    border-color: var(--hl);
}

.ctrl-btn:disabled {
    opacity: 0.4;
    cursor: default;
}

.ctrl-btn.primary {
    background: linear-gradient(135deg, rgba(79,195,247,0.2), rgba(171,71,188,0.2));
    border-color: var(--hl);
    color: var(--hl);
}

.ctrl-btn.primary:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(79,195,247,0.35), rgba(171,71,188,0.35));
}

.ctrl-btn.danger { color: var(--danger); }
.ctrl-btn.danger:hover:not(:disabled) { border-color: var(--danger); }

.ctrl-divider {
    height: 1px;
    background: var(--border);
    margin: 12px 0;
}

.ctrl-label {
    display: block;
    font-size: 0.7rem;
    color: var(--dim);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin: 8px 0 4px;
}

.ctrl-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.ctrl-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px; height: 14px;
    background: var(--hl);
    border-radius: 50%;
    cursor: pointer;
}

.ctrl-range::-moz-range-thumb {
    width: 14px; height: 14px;
    background: var(--hl);
    border-radius: 50%;
    border: none;
    cursor: pointer;
}

.ctrl-hint {
    font-size: 0.75rem;
    color: var(--dim);
    text-align: center;
    display: block;
}

.ctrl-checks label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    color: var(--dim);
    margin: 4px 0;
    cursor: pointer;
}

.ctrl-checks input[type="checkbox"] {
    accent-color: var(--hl);
}

/* Stats */
.stat {
    display: flex;
    justify-content: space-between;
    padding: 5px 0;
    font-size: 0.82rem;
    border-bottom: 1px solid rgba(255,255,255,0.04);
}

.stat span:first-child { color: var(--dim); }
.stat span:last-child { font-weight: 700; font-variant-numeric: tabular-nums; }

.civ-list {
    max-height: 300px;
    overflow-y: auto;
}

.empty-hint {
    color: var(--dim);
    font-size: 0.78rem;
    font-style: italic;
}

.civ-item {
    padding: 8px;
    margin: 4px 0;
    background: rgba(255,255,255,0.03);
    border-radius: 6px;
    border-left: 3px solid;
    font-size: 0.78rem;
}

.civ-item .civ-name {
    font-weight: 700;
    margin-bottom: 2px;
}

.civ-item .civ-detail {
    color: var(--dim);
    font-size: 0.72rem;
}

/* === Event Log === */
#event-log {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    height: 90px;
    background: var(--panel);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--border);
    z-index: 90;
    overflow: hidden;
    padding: 8px 20px;
}

#events {
    display: flex;
    flex-direction: column-reverse;
    gap: 2px;
    height: 100%;
    overflow-y: auto;
    scrollbar-width: thin;
}

.event {
    font-size: 0.78rem;
    color: var(--dim);
    padding: 2px 0;
    white-space: nowrap;
    animation: fadeIn 0.4s ease;
}

.event.genesis { color: var(--hl); font-weight: 600; }
.event.formation { color: var(--success); }
.event.law { color: var(--warn); }
.event.nation { color: var(--hl2); font-weight: 600; }
.event.war { color: var(--danger); }
.event.alliance { color: var(--hl); }
.event.milestone { color: #fff; font-weight: 700; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* === Intro Overlay === */
#intro-overlay {
    position: fixed;
    inset: 0;
    background: rgba(8, 10, 20, 0.97);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

#intro-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.intro-content {
    text-align: center;
}

.intro-content h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 900;
    letter-spacing: 8px;
    margin-bottom: 12px;
}

.intro-sub {
    color: var(--dim);
    font-size: 1.15rem;
    margin-bottom: 50px;
    letter-spacing: 2px;
}

.intro-stages {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 50px;
}

.stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 24px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: 12px;
    min-width: 100px;
    transition: all 0.3s;
}

.stage:hover {
    border-color: var(--hl);
    background: rgba(79,195,247,0.06);
    transform: translateY(-3px);
}

.stage-icon { font-size: 2rem; }
.stage span:last-child { font-size: 0.85rem; letter-spacing: 1px; }

.stage-arrow {
    color: var(--dim);
    font-size: 1.5rem;
}

.enter-btn {
    background: linear-gradient(135deg, var(--hl), var(--hl2));
    border: none;
    color: #fff;
    padding: 16px 50px;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 3px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    box-shadow: 0 0 30px rgba(79,195,247,0.3);
}

.enter-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 50px rgba(79,195,247,0.5);
}

.intro-hint {
    margin-top: 30px;
    color: var(--dim);
    font-size: 0.8rem;
    letter-spacing: 3px;
}

/* === Responsive === */
@media (max-width: 900px) {
    #controls, #stats { width: 180px; padding: 12px; }
    .intro-stages { flex-wrap: wrap; }
}

@media (max-width: 600px) {
    #controls { display: none; }
    #stats { display: none; }
    #event-log { height: 60px; }
    .intro-stages { gap: 6px; }
    .stage { padding: 12px 16px; min-width: 70px; }
    .stage-icon { font-size: 1.4rem; }
    .stage span:last-child { font-size: 0.7rem; }
    .stage-arrow { font-size: 1rem; }
}