/* ===========================
   Minimal Professional Theme
   =========================== */

:root {
    --primary: #ffffff;
    --primary-dim: rgba(255, 255, 255, 0.7);
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.4);
    --surface: rgba(255, 255, 255, 0.05);
    --surface-hover: rgba(255, 255, 255, 0.1);
    --border: rgba(255, 255, 255, 0.1);
    --bg-dark: #0a0a0f;
    --bg-gradient: linear-gradient(180deg, #0a0a0f 0%, #111118 100%);
    --danger: #ef4444;
    --success: #22c55e;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--primary);
    overflow: hidden;
    touch-action: none;
    user-select: none;
    height: 100vh;
    width: 100vw;
    position: fixed;
    -webkit-font-smoothing: antialiased;
}

/* ===========================
   Game Container
   =========================== */

#gameContainer {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-gradient);
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    background: transparent;
}

/* ===========================
   Minimal HUD
   =========================== */

#gameUI {
    position: absolute;
    top: 16px;
    left: 16px;
    display: flex;
    gap: 20px;
    z-index: 5;
    pointer-events: none;
}

.hud-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hud-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1.5px;
    color: var(--primary-dim);
    text-transform: uppercase;
}

.hud-value {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--primary);
    line-height: 1.2;
}

/* ===========================
   Screens
   =========================== */

.screen {
    position: absolute;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    z-index: 10;
    padding: 20px;
}

.screen-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    text-align: center;
}

/* ===========================
   Start Screen
   =========================== */

#startScreen {
    background: var(--bg-dark);
}

.game-title {
    font-size: clamp(48px, 12vw, 72px);
    font-weight: 800;
    letter-spacing: 8px;
    color: var(--primary);
    line-height: 1;
    margin-bottom: -8px;
}

.game-subtitle {
    font-size: clamp(12px, 3vw, 16px);
    font-weight: 500;
    letter-spacing: 6px;
    color: var(--primary-dim);
    margin-bottom: 32px;
}

.credits {
    position: absolute;
    bottom: 44px;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--primary-dim);
    opacity: 0.8;
}

.credits a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px dotted var(--primary-dim);
    transition: all var(--transition);
}

.credits a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* ===========================
   Buttons
   =========================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition);
    min-width: 180px;
}

.btn i {
    font-size: 14px;
}

.btn-primary {
    background: var(--primary);
    color: var(--bg-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(255, 255, 255, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface);
    border-color: var(--primary-dim);
}

.btn-back {
    background: transparent;
    color: var(--primary-dim);
    border: none;
    padding: 12px 24px;
    min-width: auto;
}

.btn-back:hover {
    color: var(--primary);
}

/* ===========================
   Settings Screen
   =========================== */

#settingsScreen,
#shopScreen {
    display: none;
    overflow-y: auto;
    z-index: 20;
}

#shopScreen {
    background: radial-gradient(circle at center, #1a1a2e 0%, #0a0a0f 100%);
    perspective: 1000px;
}

/* Hangar Grid Floor Effect */
#shopScreen::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background:
        linear-gradient(rgba(99, 102, 241, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: rotateX(60deg);
    transform-origin: bottom;
    pointer-events: none;
    mask-image: linear-gradient(to top, rgba(0, 0, 0, 1), transparent);
}

.settings-panel {
    width: 100%;
    max-width: 400px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 24px;
}

.settings-header-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 24px;
    position: relative;
    min-height: 44px;
}

.settings-title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 4px;
    text-align: center;
    margin-bottom: 0;
}

.btn-back-icon {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    color: var(--primary-dim);
    border: none;
    height: 44px;
    padding: 0;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all var(--transition);
    z-index: 2;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    width: auto;
    border-radius: 0;
}

.btn-back-icon i {
    font-size: 16px;
}

.btn-back-icon span {
    opacity: 0.8;
}

.btn-back-icon:hover {
    background: transparent;
    color: var(--primary);
    box-shadow: none;
    transform: translateY(-50%) translateX(-2px);
}

.btn-back-icon:hover span {
    opacity: 1;
}

.settings-group {
    margin-bottom: 28px;
}

.group-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary-dim);
    margin-bottom: 12px;
}

/* Control Toggle */
.control-toggle {
    display: flex;
    gap: 8px;
}

.control-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--primary-dim);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all var(--transition);
}

.control-btn i {
    font-size: 20px;
}

.control-btn.active {
    background: var(--primary);
    color: var(--bg-dark);
    border-color: var(--primary);
}

.control-btn:not(.active):hover {
    background: var(--surface-hover);
    border-color: var(--primary-dim);
}

/* Difficulty Toggle */
.difficulty-toggle {
    display: flex;
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 4px;
    gap: 4px;
}

.diff-btn {
    flex: 1;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--primary-dim);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all var(--transition);
}

.diff-btn.active {
    background: var(--primary);
    color: var(--bg-dark);
}

.diff-btn:not(.active):hover {
    color: var(--primary);
}

/* Toggle Rows */
.toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.toggle-row:last-child {
    border-bottom: none;
}

.toggle-row span {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
}

/* Modern Toggle Switch */
.toggle {
    position: relative;
    width: 44px;
    height: 24px;
    cursor: pointer;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-track {
    position: absolute;
    inset: 0;
    background: var(--surface);
    border-radius: var(--radius-full);
    transition: all var(--transition);
}

.toggle-track::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    top: 3px;
    background: var(--primary-dim);
    border-radius: 50%;
    transition: all var(--transition);
}

.toggle input:checked+.toggle-track {
    background: var(--accent);
}

.toggle input:checked+.toggle-track::before {
    transform: translateX(20px);
    background: var(--primary);
}

/* Ship Selection */
/* Shop Styles */
.currency-display {
    text-align: center;
    margin-bottom: 24px;
    padding: 12px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-md);
}

.currency-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary-dim);
    margin-right: 8px;
}

.currency-display span:last-child {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
}

.ship-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.ship-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 20px 12px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: none;
}

.ship-option:hover {
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-4px) scale(1.02);
    /* box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5); */
    border-color: rgba(255, 255, 255, 0.1);
}

.ship-option img.ship-icon {
    width: 100px;
    height: 100px;
    object-fit: contain;
    filter: drop-shadow(0 10px 10px rgba(0, 0, 0, 0.5));
    transition: all 0.5s ease;
}

.ship-option:hover img.ship-icon {
    transform: scale(1.1) rotate(5deg) translateY(-5px);
    filter: drop-shadow(0 20px 20px rgba(0, 0, 0, 0.6));
}

/* Spotlight effect for selected ship */
.ship-option.selected::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 40px;
    transform: translate(-50%, 80%);
    background: radial-gradient(ellipse, rgba(99, 102, 241, 0.6) 0%, transparent 70%);
    animation: pulseGlow 2s infinite alternate;
    z-index: 0;
    pointer-events: none;
}

@keyframes pulseGlow {
    from {
        opacity: 0.5;
        transform: translate(-50%, 80%) scale(1);
    }

    to {
        opacity: 1;
        transform: translate(-50%, 80%) scale(1.2);
    }
}

.ship-option.selected {
    border-color: transparent;
    background: transparent;
    /* box-shadow: 0 0 20px rgba(99, 102, 241, 0.2); */
}

.ship-option.locked {
    opacity: 0.7;
    filter: grayscale(0.8);
}

.ship-option.locked:hover {
    filter: grayscale(0);
    opacity: 1;
}

.ship-price {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary-dim);
    margin-top: 4px;
}

.ship-option.locked .ship-price {
    color: var(--accent);
}

.purchase-message {
    text-align: center;
    min-height: 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--danger);
}

.purchase-message.success {
    color: var(--success);
}

/* ===========================
   Game Over Screen
   =========================== */

#gameOverScreen {
    display: none;
}

.game-over-title {
    font-size: clamp(32px, 8vw, 48px);
    font-weight: 800;
    letter-spacing: 4px;
    color: var(--danger);
    margin-bottom: 24px;
}

.score-display {
    display: flex;
    gap: 40px;
    margin-bottom: 32px;
}

.final-score,
.high-score {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--primary-dim);
    margin-bottom: 4px;
}

.score-value {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
}

.game-over-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 200px;
}

/* ===========================
   Controls Container
   =========================== */

.controls-container {
    position: absolute;
    bottom: 105px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* D-Pad Controls */
#arrowControls {
    display: none;
}

.dpad {
    position: relative;
    width: 140px;
    height: 140px;
}

.dpad-btn {
    position: absolute;
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--primary-dim);
    font-size: 16px;
    transition: all var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.dpad-btn:active {
    background: var(--primary);
    color: var(--bg-dark);
    transform: scale(0.95);
}

.dpad-btn.up {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.dpad-btn.down {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.dpad-btn.left {
    left: 0;
    top: 50%;
    transform: translateY(-50%);
}

.dpad-btn.right {
    right: 0;
    top: 50%;
    transform: translateY(-50%);
}

.dpad-btn.up:active,
.dpad-btn.down:active {
    transform: translateX(-50%) scale(0.95);
}

.dpad-btn.left:active,
.dpad-btn.right:active {
    transform: translateY(-50%) scale(0.95);
}

/* Joystick Controls */
#joystickContainer {
    display: block;
    position: relative;
    width: 120px;
    height: 120px;
}

#joystickBase {
    position: absolute;
    inset: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 50%;
}

#joystickHandle {
    position: absolute;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    touch-action: none;
    cursor: grab;
    transition: background var(--transition);
}

#joystickHandle:active {
    background: rgba(255, 255, 255, 0.25);
    cursor: grabbing;
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
    #gameUI {
        gap: 16px;
    }

    .hud-value {
        font-size: 20px;
    }

    .controls-container {
        bottom: 100px;
        left: 50%;
        transform: translateX(-50%);
    }

    #actionControls {
        display: block;
    }

    #joystickContainer {
        width: 100px;
        height: 100px;
    }

    #joystickHandle {
        width: 42px;
        height: 42px;
    }

    .dpad {
        width: 120px;
        height: 120px;
    }

    .dpad-btn {
        width: 40px;
        height: 40px;
        font-size: 14px;
    }

    #actionControls {
        bottom: 70px;
        /* Aligned with joystick */
        right: 15%;
    }

    .action-btn {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }

    .ship-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .settings-panel {
        padding: 20px;
    }
}

@media (max-width: 360px) {
    .game-title {
        letter-spacing: 4px;
    }

    .game-subtitle {
        letter-spacing: 3px;
    }

    .btn {
        padding: 12px 24px;
        min-width: 160px;
    }
}

/* ===========================
   Animations
   =========================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.screen-content {
    animation: fadeIn 0.4s ease;
}

.settings-panel {
    animation: fadeIn 0.3s ease;
}

/* Hide scrollbar but keep functionality */
.settings-panel::-webkit-scrollbar {
    width: 0;
}

.settings-panel {
    -ms-overflow-style: none;
    scrollbar-width: none;
}