/* ============================================
   NATIVE APP ENHANCEMENTS
   ============================================
   Makes the web app feel like a native React Native app
*/

/* Smooth Tab Transitions */
.tab-content {
    display: none;
    width: 100%;
    max-width: 100%;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.tab-content.active {
    display: block;
    opacity: 1;
    transform: translateX(0);
    animation: slideInFromRight 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Native-like Scroll Behavior */
.app-main,
.tab-content {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    scroll-behavior: smooth;
}

/* Pull to Refresh */
.pull-to-refresh {
    position: absolute;
    top: -60px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.pull-to-refresh.active {
    opacity: 1;
}

.pull-to-refresh i {
    font-size: 20px;
    color: var(--text-secondary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Native-like Button Press Effect */
button,
.nav-item,
.header-btn,
.menu-item {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
    position: relative;
    overflow: hidden;
}

button:active,
.nav-item:active,
.header-btn:active,
.menu-item:active {
    transform: scale(0.96);
    transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Ripple Effect for Buttons */
button::before,
.nav-item::before,
.header-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    pointer-events: none;
}

button:active::before,
.nav-item:active::before,
.header-btn:active::before {
    width: 300px;
    height: 300px;
}

/* Native-like Modal Animations */
.modal {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal.active .modal-content {
    transform: scale(1) translateY(0);
}

/* Native-like Loading States */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.loading-spinner i {
    font-size: 24px;
    color: var(--text-secondary);
    animation: spin 1s linear infinite;
}

/* Smooth Header Hide/Show on Scroll */
.app-header {
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-header.hidden {
    transform: translateY(-100%);
}

/* Native-like Post Card Animations */
.post-card {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.post-card:nth-child(1) { animation-delay: 0.05s; }
.post-card:nth-child(2) { animation-delay: 0.1s; }
.post-card:nth-child(3) { animation-delay: 0.15s; }
.post-card:nth-child(4) { animation-delay: 0.2s; }
.post-card:nth-child(5) { animation-delay: 0.25s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Native-like Swipe Gestures */
.swipeable {
    touch-action: pan-y;
    -webkit-overflow-scrolling: touch;
}

/* Better Touch Targets (iOS/Android Guidelines) */
button,
.nav-item,
.header-btn,
.menu-item,
.post-like-btn,
.post-comment-btn {
    min-height: 44px;
    min-width: 44px;
}

/* Native-like Input Focus */
input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

/* Smooth Image Loading */
img {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img.loaded {
    opacity: 1;
}

/* Native-like Bottom Sheet Effect */
.modal-content {
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

/* Smooth Tab Indicator */
.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--text-primary);
    border-radius: 50%;
    animation: scaleIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes scaleIn {
    from {
        transform: translateX(-50%) scale(0);
    }
    to {
        transform: translateX(-50%) scale(1);
    }
}

/* Native-like Haptic Feedback Simulation */
.haptic-light {
    animation: hapticLight 0.1s ease;
}

.haptic-medium {
    animation: hapticMedium 0.15s ease;
}

.haptic-heavy {
    animation: hapticHeavy 0.2s ease;
}

@keyframes hapticLight {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.98); }
}

@keyframes hapticMedium {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.96); }
}

@keyframes hapticHeavy {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(0.94); }
}

/* Native-like Skeleton Loading */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-secondary) 0%,
        var(--bg-tertiary) 50%,
        var(--bg-secondary) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Smooth Bottom Nav Transitions */
.bottom-nav {
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.bottom-nav.hidden {
    transform: translateY(100%);
}

/* Native-like Safe Area Support */
@supports (padding: max(0px)) {
    .app-main {
        padding-bottom: max(var(--spacing-lg), env(safe-area-inset-bottom));
    }
    
    .bottom-nav {
        padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
    }
}

/* Prevent Text Selection on Native-like Elements */
.nav-item,
.header-btn,
.menu-item,
.post-like-btn,
.post-comment-btn {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Native-like Scroll Snap */
.posts-feed {
    scroll-snap-type: y proximity;
}

.post-card {
    scroll-snap-align: start;
}

/* Smooth Page Transitions */
.page-transition-enter {
    opacity: 0;
    transform: translateX(100%);
}

.page-transition-enter-active {
    opacity: 1;
    transform: translateX(0);
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-transition-exit {
    opacity: 1;
    transform: translateX(0);
}

.page-transition-exit-active {
    opacity: 0;
    transform: translateX(-100%);
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Native-like Toast Notifications */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Native-like Swipe Actions */
.swipe-action {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
    background: var(--error);
    color: white;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.swipe-action.active {
    transform: translateX(0);
}

/* Better Performance */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Native-like Focus States */
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Disable Double-tap Zoom */
button,
a,
.nav-item {
    touch-action: manipulation;
}