/* Master Animations & Ultra-Smooth Motion System */

/* 1. MODERN MINIMAL CLEAN LOADING SCREEN */
.app-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.45s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.45s ease;
    will-change: opacity, transform;
}

.app-loader.loaded {
    opacity: 0;
    visibility: hidden;
    transform: scale(1.02);
    pointer-events: none;
}

.app-loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.app-loader-logo {
    position: relative;
    width: 52px;
    height: 52px;
    background: var(--ink);
    color: var(--surface);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 600;
    font-size: 1.75rem;
    box-shadow: 0 12px 28px -6px rgba(0, 0, 0, 0.16), 0 0 0 1px rgba(255, 255, 255, 0.12) inset;
    margin-bottom: 2rem;
    animation: loader-logo-pulse 2.8s ease-in-out infinite;
}

@keyframes loader-logo-pulse {
    0%, 100% { transform: scale(1); opacity: 0.96; }
    50% { transform: scale(1.03); opacity: 1; }
}

.app-loader-pulse {
    position: absolute;
    inset: -5px;
    border-radius: 19px;
    border: 1.5px solid var(--accent);
    opacity: 0;
    animation: loader-glow-pulse 2.4s cubic-bezier(0.16, 1, 0.3, 1) infinite;
}

@keyframes loader-glow-pulse {
    0% { transform: scale(0.95); opacity: 0; }
    50% { opacity: 0.35; }
    100% { transform: scale(1.14); opacity: 0; }
}

.app-loader-progress-track {
    width: 120px;
    height: 2px;
    background: var(--border);
    border-radius: 99px;
    overflow: hidden;
    position: relative;
}

.app-loader-progress-bar {
    position: absolute;
    top: 0;
    bottom: 0;
    background: linear-gradient(90deg, var(--accent), var(--ink));
    border-radius: 99px;
    animation: loader-slide 1.6s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}

@keyframes loader-slide {
    0% { left: -45%; width: 35%; }
    50% { left: 25%; width: 50%; }
    100% { left: 100%; width: 35%; }
}

/* 2. SILKY SMOOTH PAGE & VIEW TRANSITIONS */
.content-fade {
    animation: content-smooth-fade 0.38s cubic-bezier(0.16, 1, 0.3, 1) forwards !important;
}

@keyframes content-smooth-fade {
    0% {
        opacity: 0;
        transform: translateY(12px) scale(0.995);
        filter: blur(1px);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

/* Page Card Cascade Animations */
.card-enter {
    animation: card-cascade-in 0.42s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes card-cascade-in {
    from {
        opacity: 0;
        transform: translateY(14px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 3. MODAL & OVERLAY MOTION */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(13, 15, 20, 0.45);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.35s ease;
}

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

/* Smooth Springy Modals */
.auth-modal-content,
.activity-modal-content {
    transition: transform 0.38s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.38s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

/* 4. SILKY SMOOTH SWITCH TOGGLE PHYSICS */
.switch-slider {
    transition: background-color 0.28s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

.switch-slider:before {
    transition: transform 0.32s cubic-bezier(0.34, 1.56, 0.64, 1),
                background-color 0.28s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

/* 5. SMOOTH INTERACTIVE MICRO-FEEDBACK */
button:not(:disabled),
.module-btn,
.network-tab-btn,
.auth-tab,
.menu-item-btn,
.card,
.post-card,
.action-btn {
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1),
                background-color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
                color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.2s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

button:active:not(:disabled) {
    transform: scale(0.972) !important;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Like Heart Pulse Effect */
@keyframes heart-pulse-bounce {
    0% { transform: scale(1); }
    40% { transform: scale(1.35) rotate(-8deg); }
    70% { transform: scale(0.92) rotate(4deg); }
    100% { transform: scale(1) rotate(0deg); }
}

.liked-heart-anim {
    animation: heart-pulse-bounce 0.42s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

/* Smooth Dropdowns & Popovers */
.dropdown-menu,
.post-popover,
.comment-options-menu {
    transform-origin: top right;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.25s ease !important;
}

/* Cards Section Collapse/Expand Animation */
.cards-grid-wrapper {
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                margin 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
    max-height: 800px;
    opacity: 1;
}

.cards-grid-wrapper.hidden {
    max-height: 0 !important;
    opacity: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 0 !important;
    pointer-events: none;
}