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

:root {
    --bg-dark: #0a0e1a;
    --bg-medium: #1a1f2e;
    --bg-light: #2a3444;
    --accent: #ff6b35;
    --accent-hover: #ff8555;
    --success: #4caf50;
    --danger: #f44336;
    --warning: #ff9800;
    --text-light: #e0e0e0;
    --text-dark: #b0b0b0;
    --border: #3a4454;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-medium) 100%);
    color: var(--text-light);
    min-height: 100vh;
    background-attachment: fixed;
}

.screen {
    display: none;
    animation: fadeIn 0.3s;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Message Box */
#messageBox {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    max-width: 400px;
}

.message {
    background: var(--bg-light);
    border-left: 4px solid;
    padding: 15px 20px;
    margin-bottom: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from { transform: translateX(400px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.message.success { border-color: var(--success); }
.message.error { border-color: var(--danger); }
.message.warning { border-color: var(--warning); }
.message.info { border-color: var(--accent); }

/* Auth Screen */
.auth-container {
    max-width: 450px;
    margin: 100px auto;
    background: var(--bg-medium);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header h1 {
    font-size: 2.5em;
    color: var(--accent);
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(255, 107, 53, 0.5);
}

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

:root {
    --bg-dark: #0a0e1a;
    --bg-medium: #1a1f2e;
    --bg-light: #2a3444;
    --accent: #ff6b35;
    --accent-hover: #ff8555;
    --success: #4caf50;
    --danger: #f44336;
    --warning: #ff9800;
    --text-light: #e0e0e0;
    --text-dark: #b0b0b0;
    --border: #3a4454;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-medium) 100%);
    color: var(--text-light);
    min-height: 100vh;
    background-attachment: fixed;
}

.screen {
    display: none;
    animation: fadeIn 0.3s;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Message Box */
#messageBox {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    max-width: 400px;
}

.message {
    background: var(--bg-light);
    border-left: 4px solid;
    padding: 15px 20px;
    margin-bottom: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from { transform: translateX(400px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.message.success { border-color: var(--success); }
.message.error { border-color: var(--danger); }
.message.warning { border-color: var(--warning); }
.message.info { border-color: var(--accent); }

/* Auth Screen */
.auth-container {
    max-width: 450px;
    margin: 100px auto;
    background: var(--bg-medium);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-header h1 {
    font-size: 2.5em;
    color: var(--accent);
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(255, 107, 53, 0.5);
}

.auth-header p {
    color: var(--text-dark);
    font-size: 1.1em;
}

.auth-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.auth-tab {
    flex: 1;
    padding: 12px;
    background: var(--bg-light);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
}

.auth-tab:hover {
    background: var(--bg-dark);
}

.auth-tab.active {
    background: var(--accent);
    border-color: var(--accent-hover);
    font-weight: bold;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Forms */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 16px;
    transition: all 0.3s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2);
}

/* Buttons */
button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, #ff8555 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.6);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--text-light);
    border: 2px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-dark);
    border-color: var(--accent);
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

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

.btn-danger:hover:not(:disabled) {
    background: #d32f2f;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Game Header */
.game-header {
    background: var(--bg-medium);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid var(--border);
}

.game-header h1 {
    font-size: 2em;
    color: var(--accent);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 1.1em;
}

/* Lobby */
.lobby-container {
    display: grid;
    gap: 20px;
}

.lobby-section {
    background: var(--bg-medium);
    padding: 25px;
    border-radius: 12px;
    border: 2px solid var(--border);
}

.lobby-section h2 {
    color: var(--accent);
    margin-bottom: 20px;
    font-size: 1.5em;
}

.create-session-form {
    display: grid;
    gap: 15px;
}

.join-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.join-by-code,
.join-by-invite {
    background: var(--bg-dark);
    padding: 20px;
    border-radius: 10px;
    border: 2px solid var(--border);
}

.join-by-code h3,
.join-by-invite h3 {
    color: var(--text-light);
    margin-bottom: 15px;
}

.join-by-code input,
.join-by-invite input,
.join-by-code button,
.join-by-invite button {
    margin-top: 10px;
}

/* Sessions List */
.sessions-list {
    display: grid;
    gap: 15px;
    margin-top: 15px;
    max-height: 400px;
    overflow-y: auto;
}

.session-card {
    background: var(--bg-dark);
    padding: 20px;
    border-radius: 10px;
    border: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
}

.session-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.session-info h3 {
    color: var(--accent);
    margin-bottom: 8px;
}

.session-info p {
    color: var(--text-dark);
    font-size: 0.9em;
}

.session-players {
    font-size: 1.1em;
    color: var(--text-light);
    margin: 5px 0;
}

/* Waiting Room */
.waiting-container {
    display: grid;
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
}

.session-info-card {
    background: var(--bg-medium);
    padding: 30px;
    border-radius: 12px;
    border: 2px solid var(--border);
    text-align: center;
}

.session-info-card h2 {
    color: var(--accent);
    font-size: 2em;
    margin-bottom: 20px;
}

.session-code-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.code-box {
    background: var(--bg-dark);
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 2em;
    font-weight: bold;
    letter-spacing: 5px;
    color: var(--accent);
    border: 3px solid var(--accent);
    font-family: 'Courier New', monospace;
}

.invite-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 15px;
}

#inviteCodeDisplay {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#inviteCodeDisplay .code-box {
    font-size: 1.2em;
    padding: 10px 20px;
}

.players-waiting {
    background: var(--bg-medium);
    padding: 25px;
    border-radius: 12px;
    border: 2px solid var(--border);
}

.players-waiting h3 {
    color: var(--accent);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.players-list {
    display: grid;
    gap: 10px;
}

.player-item {
    background: var(--bg-dark);
    padding: 15px;
    border-radius: 8px;
    border: 2px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.player-item.host {
    border-color: var(--accent);
}

.player-name {
    font-weight: 600;
    font-size: 1.1em;
}

.player-badge {
    background: var(--accent);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: bold;
}

.waiting-text {
    text-align: center;
    font-size: 1.2em;
    color: var(--text-dark);
    padding: 20px;
}

.hint {
    text-align: center;
    color: var(--text-dark);
    margin-top: 10px;
}

/* Game Screen */
.game-header-ingame {
    background: var(--bg-medium);
    padding: 15px 25px;
    border-radius: 12px;
    margin-bottom: 15px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 20px;
    align-items: center;
    border: 2px solid var(--border);
}

.header-left h1 {
    font-size: 1.5em;
    color: var(--accent);
}

.day-counter {
    background: var(--bg-dark);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9em;
    margin-top: 5px;
    display: inline-block;
}

.resources-display {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.resource-item {
    background: var(--bg-dark);
    padding: 10px 20px;
    border-radius: 8px;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1em;
    font-weight: 600;
    transition: all 0.3s;
}

.resource-item:hover {
    border-color: var(--accent);
}

.resource-icon {
    font-size: 1.3em;
}

.bunker-stats {
    display: flex;
    gap: 15px;
    font-size: 1.1em;
}

.bunker-stats > div {
    background: var(--bg-dark);
    padding: 8px 15px;
    border-radius: 8px;
}

/* Game Tabs */
.game-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    background: var(--bg-medium);
    padding: 15px;
    border-radius: 12px;
}

.game-tab {
    padding: 12px 24px;
    background: var(--bg-dark);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
    font-weight: 600;
}

.game-tab:hover {
    background: var(--bg-light);
}

.game-tab.active {
    background: var(--accent);
    border-color: var(--accent-hover);
}

/* Game Content */
.game-content {
    background: var(--bg-medium);
    padding: 30px;
    border-radius: 12px;
    border: 2px solid var(--border);
    min-height: 500px;
}

.build-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.build-card {
    background: var(--bg-dark);
    padding: 25px;
    border-radius: 10px;
    border: 2px solid var(--border);
    transition: all 0.3s;
}

.build-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

.build-card h3 {
    color: var(--accent);
    margin-bottom: 10px;
    font-size: 1.3em;
}

.build-level {
    color: #ffd700;
    font-size: 1.1em;
    margin-bottom: 10px;
}

.build-description {
    color: var(--text-dark);
    font-size: 0.9em;
    margin-bottom: 15px;
}

.build-cost {
    background: var(--bg-medium);
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
    font-size: 0.9em;
}

.build-cost div {
    margin: 3px 0;
}

.cost-item {
    display: flex;
    justify-content: space-between;
}

.insufficient {
    color: var(--danger);
}

.sufficient {
    color: var(--success);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* Responsive */
@media (max-width: 768px) {
    .game-header-ingame {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .resources-display {
        gap: 10px;
    }
    
    .resource-item {
        padding: 8px 12px;
        font-size: 0.9em;
    }
    
    .build-grid {
        grid-template-columns: 1fr;
    }
    
    .session-code-display {
        flex-direction: column;
    }
    
    .code-box {
        font-size: 1.5em;
    }
}