:root {
    --primary-color: #0f766e;
    --secondary-color: #22d3ee;
    --accent-color: #a3ff12;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5f5;
    --text-muted: #8b97b5;
    --bg-primary: #050b1a;
    --bg-secondary: #0f172a;
    --bg-card: #16233d;
    --border-color: #223352;
    --shadow-light: rgba(34, 211, 238, 0.12);
    --shadow-medium: rgba(5, 18, 38, 0.35);
    --shadow-heavy: rgba(5, 12, 26, 0.65);
    --gradient-primary: linear-gradient(140deg, #0f172a 0%, #0f766e 45%, #22d3ee 100%);
    --gradient-accent: linear-gradient(140deg, #d4ff5e 0%, #7fff45 45%, #4ade80 100%);
    --border-radius: 16px;
    --border-radius-small: 10px;
    --transition-fast: 0.18s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --text-primary: #0f172a;
    --text-secondary: #1f2937;
    --text-muted: #4b5563;
    --bg-primary: #f1f5f9;
    --bg-secondary: #e2e8f0;
    --bg-card: #f8fafc;
    --border-color: #cbd5e1;
    --shadow-light: rgba(15, 118, 110, 0.08);
    --shadow-medium: rgba(15, 23, 42, 0.12);
    --shadow-heavy: rgba(15, 23, 42, 0.18);
    --accent-color: #16a34a;
    --gradient-primary: linear-gradient(135deg, #67e8f9 0%, #22d3ee 45%, #0ea5e9 100%);
    --gradient-accent: linear-gradient(135deg, #bbf7d0 0%, #4ade80 50%, #16a34a 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
    scrollbar-width: none;
}

body::-webkit-scrollbar {
    display: none;
}

html {
    scrollbar-width: none;
}

html::-webkit-scrollbar {
    display: none;
}

.app-container {
    min-height: 100vh;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-nav {
    background: var(--bg-secondary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 100;
}

.nav-controls {
    display: flex;
    gap: 0.5rem;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav-btn:hover {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-light);
}

.nav-btn .icon {
    font-size: 1rem;
}

.game-container {
    flex: 1;
    display: flex;
    gap: 1rem;
    padding: 1rem;
    overflow: hidden;
    min-height: 0;
}

.left-panel,
.right-panel {
    width: 300px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    overflow-x: hidden;
    padding-bottom: 1rem;
}

.left-panel::-webkit-scrollbar,
.right-panel::-webkit-scrollbar {
    width: 6px;
}

.left-panel::-webkit-scrollbar-track,
.right-panel::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

.left-panel::-webkit-scrollbar-thumb,
.right-panel::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.left-panel::-webkit-scrollbar-thumb:hover,
.right-panel::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.panel-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
}

.panel-section h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.resource-display {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.resource-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-small);
}

.resource-icon {
    font-size: 1.5rem;
}

.resource-label {
    color: var(--text-secondary);
}

.resource-value {
    margin-left: auto;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-color);
}

.action-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: 1rem;
    margin-bottom: 1rem;
}

.action-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.action-icon {
    font-size: 1.5rem;
}

.action-name {
    font-weight: 600;
    color: var(--text-primary);
}

.action-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.action-button {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--gradient-primary);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius-small);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-button * {
    pointer-events: none;
}

.action-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-light);
}

.action-button:active {
    transform: translateY(0);
}

.action-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.action-button.placing {
    background: var(--gradient-accent);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    flex: 1;
}

.btn-cost {
    font-weight: 700;
}

.upgrades-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.upgrade-btn {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.upgrade-btn:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(15, 118, 110, 0.1) 100%);
    transform: translateX(4px);
}

.upgrade-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.upgrade-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.upgrade-icon {
    font-size: 1.2rem;
}

.upgrade-name {
    font-weight: 600;
    color: var(--text-primary);
}

.upgrade-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.upgrade-cost {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--accent-color);
    font-weight: 700;
}

.game-board {
    flex: 1;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    min-height: 0;
    min-width: 0;
}

#gameCanvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

#gameCanvas.placing {
    cursor: copy;
}

#gameCanvas.placing-base {
    cursor: crosshair;
}

.click-effect {
    position: absolute;
    pointer-events: none;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    opacity: 0;
    transition: all 0.5s ease;
}

.click-effect.show {
    opacity: 1;
    transform: translateY(-50px) scale(1.5);
}

.goal-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: 1rem;
}

.goal-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.goal-icon {
    font-size: 1.5rem;
}

.goal-name {
    font-weight: 600;
    color: var(--text-primary);
}

.goal-progress {
    margin-bottom: 1rem;
}

.progress-bar {
    width: 100%;
    height: 24px;
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-accent);
    transition: width 0.3s ease;
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.goal-button {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--gradient-accent);
    border: 1px solid var(--accent-color);
    border-radius: var(--border-radius-small);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.goal-button * {
    pointer-events: none;
}

.goal-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(163, 255, 18, 0.3);
}

.goal-button:active {
    transform: translateY(0);
}

.goal-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.stats-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-small);
}

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    font-weight: 700;
    color: var(--accent-color);
}

.stat-unit {
    margin-left: 0.25rem;
}

.info-section .info-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-text p {
    margin-bottom: 0.5rem;
}

.info-text strong {
    color: var(--text-primary);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px var(--shadow-heavy);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
}

.modal-body {
    padding: 2rem;
    text-align: center;
}

.modal-body p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
}

.btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-small);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--shadow-light);
}

.btn-primary:active {
    transform: translateY(0);
}

@media (max-width: 1200px) {
    .left-panel,
    .right-panel {
        width: 250px;
    }
}

@media (max-width: 768px) {
    .game-container {
        flex-direction: column;
    }

    .left-panel,
    .right-panel {
        width: 100%;
        max-height: 250px;
        flex-shrink: 0;
    }

    .game-board {
        flex: 1;
        min-height: 300px;
    }
    
    .app-container {
        max-height: 100vh;
    }

    .app-title {
        font-size: 1.1rem;
        position: static;
        transform: none;
        width: 100%;
        text-align: center;
        order: -1;
    }

    .top-nav {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}