/* ============================================
   Mobile Optimizations
   Touch controls, responsive design, performance
   ============================================ */

/* === Mobile-First Responsive Design === */
@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.2rem;
        --spacing-sm: 0.4rem;
        --spacing-md: 0.8rem;
        --spacing-lg: 1.2rem;
        --spacing-xl: 1.6rem;
        --spacing-xxl: 2.4rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    .game-title {
        font-size: 2.5rem;
    }

    .game-subtitle {
        font-size: 1rem;
    }

    /* Main Menu Mobile */
    .menu-content {
        padding: var(--spacing-md);
        max-width: 100%;
    }

    .menu-btn {
        min-height: 56px;
        font-size: 1rem;
    }

    /* Leader Selection Mobile */
    .leaders-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: var(--spacing-sm);
    }

    .leader-detail.active {
        grid-template-columns: 1fr;
    }

    .leader-portrait-large {
        max-width: 300px;
        margin: 0 auto;
    }

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

    /* Game HUD Mobile */
    .hud-top {
        flex-wrap: nowrap;
        gap: var(--spacing-xs);
        padding: 0;
    }

    .hud-minimap {
        flex-direction: row;
        align-items: center;
        gap: 0;
        padding: 0;
    }

    .minimap-container {
        width: min(145px, 32vw);
        max-width: none;
        margin: 0;
    }

    .hud-resources {
        gap: var(--spacing-xs);
        flex-wrap: nowrap;
    }

    .resource {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .resource-icon {
        font-size: 1rem;
    }

    .resource-value {
        font-size: 0.9rem;
    }

    .hud-turn {
        padding: var(--spacing-xs) var(--spacing-md);
    }

    .turn-value {
        font-size: 1.2rem;
    }

    .command-overview {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        top: 92px;
        width: auto;
        max-height: min(52vh, 420px);
        padding: 0.45rem;
        gap: 0.38rem;
    }

    .command-overview .overview-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.36rem;
    }

    .command-overview .overview-card {
        padding: 0.32rem 0.4rem;
    }

    .command-overview .overview-card h4 {
        font-size: 0.69rem;
    }

    .command-overview .overview-card-body {
        font-size: 0.65rem;
    }

    .command-overview .overview-actions {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .command-overview .overview-action-btn {
        padding: 0.26rem 0.2rem;
        font-size: 0.64rem;
        min-height: 44px;
    }

    .command-overview .overview-help {
        font-size: 0.66rem;
    }

    /* Unit Panel Mobile */
    .unit-panel {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        top: auto;
        bottom: 66px;
        width: auto;
        max-width: none;
        max-height: min(30vh, 220px);
        border-radius: 10px;
    }

    .unit-panel-header {
        padding: 0.35rem 0.55rem;
    }

    .unit-panel-header h3 {
        font-size: 0.92rem;
    }

    .unit-panel-meta {
        margin-top: 0.1rem;
        font-size: 0.62rem;
    }

    .close-btn {
        width: 26px;
        height: 26px;
        font-size: 1.2rem;
        min-width: 26px;
        min-height: 26px;
    }

    .unit-panel-content {
        padding: 0.4rem 0.5rem;
    }

    .unit-portrait {
        display: none;
    }

    .unit-stats-grid {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.25rem;
        margin-bottom: 0.35rem;
    }

    .stat {
        background: rgba(0, 0, 0, 0.16);
        border: 1px solid rgba(0, 0, 0, 0.12);
        border-radius: 4px;
        padding: 0.2rem 0.3rem;
        gap: 0.1rem;
    }

    .stat-label {
        font-size: 0.6rem;
        line-height: 1.1;
    }

    .stat-value {
        font-size: 0.68rem;
        line-height: 1.1;
    }

    .stat-bar {
        height: 4px;
    }

    .unit-actions {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.25rem;
    }

    .unit-actions .action-btn {
        padding: 0.25rem 0.3rem;
        font-size: 0.68rem;
        min-height: 28px;
        min-width: 0;
    }

    /* Action Bar Mobile */
    .action-bar {
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
    }

    .action-bar-btn {
        min-width: 70px;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .btn-icon {
        font-size: 1.3rem;
    }

    .btn-label {
        font-size: 0.75rem;
    }

    /* Modal Mobile */
    .modal {
        max-width: 95%;
        max-height: 85%;
        padding: var(--spacing-lg);
    }

    /* Notifications Mobile */
    #notification-container {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        left: var(--spacing-sm);
    }

    .notification {
        max-width: 100%;
    }
}

/* === Touch-Friendly Interactions === */
/* Ensure all interactive elements are at least 44x44px */
button,
.clickable {
    min-width: 44px;
    min-height: 44px;
    -webkit-tap-highlight-color: rgba(212, 175, 55, 0.2);
}

/* Prevent text selection on game elements */
.game-map-container,
.unit-panel,
.action-bar,
.game-hud {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}

/* Touch feedback */
button:active,
.clickable:active {
    opacity: 0.8;
    transform: scale(0.98);
}

/* === Landscape Orientation === */
@media (orientation: landscape) and (max-height: 600px) {
    .game-title {
        font-size: 2rem;
        margin-bottom: var(--spacing-xs);
    }

    .game-subtitle {
        font-size: 0.9rem;
        margin-bottom: var(--spacing-md);
    }

    .menu-content {
        padding: var(--spacing-md);
    }

    .main-menu-nav {
        margin-top: var(--spacing-lg);
        gap: var(--spacing-sm);
    }

    .menu-btn {
        min-height: 48px;
        padding: var(--spacing-sm) var(--spacing-lg);
    }

    .byzantine-emblem {
        width: 80px;
        height: 80px;
        margin-bottom: var(--spacing-md);
    }

    .byzantine-emblem::before {
        font-size: 2rem;
    }

    /* Game screen landscape optimizations */
    .unit-panel {
        top: auto;
        bottom: 64px;
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        width: auto;
        max-height: min(36vh, 190px);
    }

    .action-bar {
        flex-direction: row;
        justify-content: center;
    }
}

/* === Portrait Orientation === */
@media (orientation: portrait) {
    .leaders-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .era-tabs {
        flex-direction: column;
    }

    .era-tab {
        text-align: center;
    }
}

/* === Small Screens (< 375px) === */
@media (max-width: 375px) {
    .game-title {
        font-size: 2rem;
    }

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

    .hud-resources {
        font-size: 0.85rem;
    }

    .action-bar-btn {
        min-width: 60px;
    }

    .btn-label {
        font-size: 0.7rem;
    }
}

/* === Large Screens (Tablets & Desktop) === */
@media (min-width: 769px) {
    .leaders-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }

    .unit-panel {
        width: 350px;
    }

    .action-bar {
        justify-content: center;
        gap: var(--spacing-lg);
    }

    .action-bar-btn {
        min-width: 100px;
    }
}

/* === Performance Optimizations === */
/* Use GPU acceleration for animations */
.menu-btn,
.leader-card,
.action-bar-btn,
.modal {
    will-change: transform;
}

/* Reduce animations on low-end devices */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* === Safe Area Insets (for notched devices) === */
@supports (padding: env(safe-area-inset-top)) {
    .game-hud {
        padding-top: env(safe-area-inset-top);
    }

    .action-bar {
        padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
    }

    #notification-container {
        top: calc(var(--spacing-lg) + env(safe-area-inset-top));
        right: calc(var(--spacing-lg) + env(safe-area-inset-right));
    }
}

/* === Dark Mode Support === */
@media (prefers-color-scheme: dark) {
    /* Already dark by default, but can adjust if needed */
}

/* === High Contrast Mode === */
@media (prefers-contrast: high) {
    :root {
        --border-gold: 3px solid var(--imperial-gold);
    }

    .menu-btn,
    .leader-card,
    .action-bar-btn {
        border-width: 3px;
    }
}

/* === Loading States === */
.loading {
    pointer-events: none;
    opacity: 0.6;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    border: 3px solid var(--imperial-gold);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* === Disabled States === */
button:disabled,
.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

/* === Focus States for Accessibility === */
button:focus-visible,
.clickable:focus-visible {
    outline: 2px solid var(--gold-light);
    outline-offset: 2px;
}

/* === Swipe Gestures === */
.swipeable {
    touch-action: pan-y;
}

/* === Prevent Zoom on Input Focus (iOS) === */
input,
select,
textarea {
    font-size: 16px;
}