/* ============================================================
 * KNKYX® Mobile App - Core Stylesheet
 * File: /app/assets/css/app.css
 * Purpose: Mobile-first dark theme for KNKYX Club App
 * ============================================================ */

/* === CSS Custom Properties === */
:root {
    /* Colors */
    --app-bg: #0a0a0f;
    --app-bg-secondary: #111118;
    --app-bg-card: #16161f;
    --app-bg-elevated: #1c1c28;
    --app-bg-input: #1a1a26;
    --app-border: #2a2a3a;
    --app-border-light: #333346;
    
    --app-text: #e8e8f0;
    --app-text-secondary: #8888a0;
    --app-text-muted: #555570;
    --app-text-inverse: #0a0a0f;
    
    --app-accent: #ff3366;
    --app-accent-hover: #ff4d7a;
    --app-accent-glow: rgba(255, 51, 102, 0.3);
    --app-accent-gradient: linear-gradient(135deg, #ff3366, #ff6b35);
    
    --app-success: #22c55e;
    --app-warning: #f59e0b;
    --app-danger: #ef4444;
    --app-info: #3b82f6;
    
    --app-online: #22c55e;
    --app-premium: #fbbf24;
    --app-verified: #3b82f6;
    
    /* Spacing */
    --app-safe-top: env(safe-area-inset-top, 0px);
    --app-safe-bottom: env(safe-area-inset-bottom, 0px);
    --app-safe-left: env(safe-area-inset-left, 0px);
    --app-safe-right: env(safe-area-inset-right, 0px);
    
    --app-header-height: 56px;
    --app-tabbar-height: 60px;
    --app-spacing-xs: 4px;
    --app-spacing-sm: 8px;
    --app-spacing-md: 12px;
    --app-spacing-lg: 16px;
    --app-spacing-xl: 24px;
    --app-spacing-2xl: 32px;
    
    /* Border Radius */
    --app-radius-sm: 8px;
    --app-radius-md: 12px;
    --app-radius-lg: 16px;
    --app-radius-xl: 20px;
    --app-radius-full: 50%;
    
    /* Typography */
    --app-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --app-font-size-xs: 11px;
    --app-font-size-sm: 13px;
    --app-font-size-md: 15px;
    --app-font-size-lg: 17px;
    --app-font-size-xl: 20px;
    --app-font-size-2xl: 24px;
    --app-font-size-3xl: 28px;
    
    /* Shadows */
    --app-shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --app-shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --app-shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
    --app-shadow-glow: 0 0 20px var(--app-accent-glow);
    
    /* Transitions */
    --app-transition-fast: 150ms ease;
    --app-transition-normal: 250ms ease;
    --app-transition-slow: 350ms ease;
}

/* === Reset & Base === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    height: 100%;
    overflow: hidden;
}

body.knkyx-app {
    font-family: var(--app-font);
    background: var(--app-bg);
    color: var(--app-text);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overscroll-behavior: none;
}

a {
    color: var(--app-accent);
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

/* === iOS Status Bar Spacer === */
.app-statusbar-spacer {
    height: var(--app-safe-top);
    background: var(--app-bg);
    flex-shrink: 0;
}

/* === App Header === */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--app-header-height);
    padding: 0 var(--app-spacing-md);
    background: var(--app-bg);
    border-bottom: 1px solid var(--app-border);
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.app-header-left,
.app-header-right {
    display: flex;
    align-items: center;
    gap: var(--app-spacing-sm);
    min-width: 60px;
}

.app-header-right {
    justify-content: flex-end;
}

.app-header-center {
    flex: 1;
    text-align: center;
}

.app-header-title {
    font-size: var(--app-font-size-lg);
    font-weight: 600;
    color: var(--app-text);
}

.app-header-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--app-text);
    font-size: 18px;
    border-radius: var(--app-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--app-transition-fast);
}

.app-header-btn:active {
    background: var(--app-bg-elevated);
}

.app-logo {
    display: flex;
    align-items: baseline;
    gap: 1px;
}

.app-logo-text {
    font-size: var(--app-font-size-xl);
    font-weight: 700;
    color: var(--app-text);
    letter-spacing: 1px;
}

.app-logo-dot {
    color: var(--app-accent);
    font-size: var(--app-font-size-xl);
    font-weight: 700;
}

.app-logo-sub {
    font-size: var(--app-font-size-md);
    font-weight: 500;
    color: var(--app-text-secondary);
}

/* === Main Content === */
.app-content {
    flex: 1;
    min-height: 0; /* Critical for flexbox scroll */
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.page-login .app-content {
    display: flex;
    flex-direction: column;
}

/* === Bottom Tab Bar === */
.app-tabbar {
    display: flex;
    align-items: stretch;
    justify-content: space-around;
    height: var(--app-tabbar-height);
    padding-bottom: var(--app-safe-bottom);
    background: var(--app-bg);
    border-top: 1px solid var(--app-border);
    flex-shrink: 0;
    z-index: 100;
}

.app-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    color: var(--app-text-muted);
    font-size: var(--app-font-size-xs);
    text-decoration: none;
    transition: color var(--app-transition-fast);
    position: relative;
    padding: 6px 0;
}

.app-tab i {
    font-size: 20px;
    transition: transform var(--app-transition-fast);
}

.app-tab.active {
    color: var(--app-accent);
}

.app-tab.active i {
    transform: scale(1.1);
}

.app-tab:active {
    opacity: 0.7;
}

.app-tab-badge {
    position: absolute;
    top: 4px;
    right: calc(50% - 18px);
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    background: var(--app-accent);
    color: white;
    font-size: 10px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5px;
}

/* === Profile Grid (Browse) === */
.browse-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    padding: 2px;
}

@media (min-width: 400px) {
    .browse-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 3px;
        padding: 3px;
    }
}

@media (min-width: 600px) {
    .browse-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.profile-tile {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    border-radius: var(--app-radius-sm);
    cursor: pointer;
    background: var(--app-bg-card);
}

.profile-tile img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--app-transition-slow);
}

.profile-tile:active img {
    transform: scale(1.05);
}

.profile-tile-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 24px 8px 8px;
    background: linear-gradient(transparent, rgba(0,0,0,0.85));
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.profile-tile-name {
    font-size: var(--app-font-size-sm);
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: 4px;
}

.profile-tile-info {
    font-size: var(--app-font-size-xs);
    color: rgba(255,255,255,0.7);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-tile-online {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--app-online);
    border: 2px solid rgba(0,0,0,0.5);
}

.profile-tile-distance {
    position: absolute;
    top: 8px;
    left: 8px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
    padding: 2px 6px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 600;
    color: #fff;
}

.profile-tile-badges {
    display: flex;
    gap: 3px;
}

.profile-tile .badge-verified {
    color: var(--app-verified);
    font-size: 11px;
}

.profile-tile .badge-premium {
    color: var(--app-premium);
    font-size: 11px;
}

.profile-tile-spark {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--app-accent);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: #fff;
    animation: sparkPulse 2s ease-in-out infinite;
}

@keyframes sparkPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* === Filter Bar === */
.browse-filterbar {
    display: flex;
    align-items: center;
    gap: var(--app-spacing-sm);
    padding: var(--app-spacing-sm) var(--app-spacing-md);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    border-bottom: 1px solid var(--app-border);
    flex-shrink: 0;
}

.browse-filterbar::-webkit-scrollbar {
    display: none;
}

.filter-chip {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--app-border);
    background: var(--app-bg-card);
    color: var(--app-text-secondary);
    font-size: var(--app-font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    cursor: pointer;
    transition: all var(--app-transition-fast);
    flex-shrink: 0;
}

.filter-chip.active {
    background: var(--app-accent);
    border-color: var(--app-accent);
    color: #fff;
}

.filter-chip:active {
    transform: scale(0.95);
}

/* === Profile Detail View === */
.profile-view {
    padding-bottom: var(--app-spacing-xl);
}

.profile-hero {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    max-height: 70vh;
    overflow: hidden;
}

.profile-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-hero-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 60px var(--app-spacing-lg) var(--app-spacing-lg);
    background: linear-gradient(transparent, rgba(0,0,0,0.9));
}

.profile-hero-name {
    font-size: var(--app-font-size-2xl);
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
}

.profile-hero-meta {
    font-size: var(--app-font-size-md);
    color: rgba(255,255,255,0.8);
    margin-top: 4px;
}

.profile-actions {
    display: flex;
    justify-content: center;
    gap: var(--app-spacing-md);
    padding: var(--app-spacing-lg);
    border-bottom: 1px solid var(--app-border);
}

.profile-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: var(--app-spacing-sm) var(--app-spacing-lg);
    border: none;
    background: transparent;
    color: var(--app-text-secondary);
    cursor: pointer;
    transition: color var(--app-transition-fast);
}

.profile-action-btn i {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--app-bg-elevated);
    border: 1px solid var(--app-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all var(--app-transition-fast);
}

.profile-action-btn:active i {
    transform: scale(0.9);
}

.profile-action-btn.primary i {
    background: var(--app-accent);
    border-color: var(--app-accent);
    color: #fff;
}

.profile-action-btn span {
    font-size: var(--app-font-size-xs);
}

.profile-section {
    padding: var(--app-spacing-lg);
    border-bottom: 1px solid var(--app-border);
}

.profile-section-title {
    font-size: var(--app-font-size-sm);
    font-weight: 600;
    color: var(--app-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--app-spacing-md);
}

.profile-about {
    font-size: var(--app-font-size-md);
    line-height: 1.6;
    color: var(--app-text);
}

.profile-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--app-spacing-sm);
}

.profile-tag {
    padding: 5px 12px;
    border-radius: 16px;
    background: var(--app-bg-elevated);
    border: 1px solid var(--app-border);
    font-size: var(--app-font-size-sm);
    color: var(--app-text);
}

.profile-tag.tag-yellow {
    background: rgba(234, 179, 8, 0.15);
    border-color: rgba(234, 179, 8, 0.4);
    color: #fbbf24;
}

.profile-tag.tag-red {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
    color: #f87171;
}

.profile-headline {
    font-size: var(--app-font-size-lg);
    font-style: italic;
    color: var(--app-text-secondary);
    text-align: center;
    line-height: 1.4;
}

.profile-subsection-title {
    font-size: var(--app-font-size-xs);
    font-weight: 600;
    color: var(--app-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: var(--app-spacing-xs);
}

.profile-social-links {
    display: flex;
    flex-direction: column;
    gap: var(--app-spacing-sm);
}

.profile-social-item {
    display: flex;
    align-items: center;
    gap: var(--app-spacing-md);
    padding: var(--app-spacing-sm) var(--app-spacing-md);
    background: var(--app-bg-elevated);
    border-radius: var(--app-radius-sm);
    font-size: var(--app-font-size-sm);
    color: var(--app-text);
}

.profile-social-item i {
    width: 20px;
    text-align: center;
    color: var(--app-primary);
    font-size: 16px;
}

.profile-section-title i {
    margin-right: 6px;
    color: var(--app-primary);
}

.profile-details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--app-spacing-sm);
}

.profile-detail-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--app-spacing-sm);
    background: var(--app-bg-elevated);
    border-radius: var(--app-radius-sm);
}

.profile-detail-label {
    font-size: var(--app-font-size-xs);
    color: var(--app-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.profile-detail-value {
    font-size: var(--app-font-size-sm);
    font-weight: 500;
    color: var(--app-text);
}

/* Profile Images Gallery */
.profile-images-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3px;
}

.profile-images-grid .img-thumb {
    aspect-ratio: 1;
    overflow: hidden;
    border-radius: var(--app-radius-sm);
    cursor: pointer;
}

.profile-images-grid .img-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--app-transition-normal);
}

.profile-images-grid .img-thumb:active img {
    transform: scale(1.05);
}

/* === Search View === */
.search-bar {
    display: flex;
    align-items: center;
    gap: var(--app-spacing-sm);
    padding: var(--app-spacing-sm) var(--app-spacing-md);
    border-bottom: 1px solid var(--app-border);
}

.search-input-wrap {
    flex: 1;
    position: relative;
}

.search-input-wrap i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--app-text-muted);
    font-size: 14px;
}

.search-input {
    width: 100%;
    padding: 10px 12px 10px 36px;
    border: none;
    border-radius: var(--app-radius-lg);
    background: var(--app-bg-input);
    color: var(--app-text);
    font-size: var(--app-font-size-md);
    font-family: var(--app-font);
    outline: none;
}

.search-input::placeholder {
    color: var(--app-text-muted);
}

.search-cancel {
    background: none;
    border: none;
    color: var(--app-accent);
    font-size: var(--app-font-size-md);
    cursor: pointer;
    padding: var(--app-spacing-sm);
}

/* === Settings View === */
.settings-list {
    padding: var(--app-spacing-md) 0;
}

.settings-section-title {
    padding: var(--app-spacing-lg) var(--app-spacing-lg) var(--app-spacing-sm);
    font-size: var(--app-font-size-xs);
    font-weight: 600;
    color: var(--app-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.settings-item {
    display: flex;
    align-items: center;
    gap: var(--app-spacing-md);
    padding: var(--app-spacing-md) var(--app-spacing-lg);
    cursor: pointer;
    transition: background var(--app-transition-fast);
}

.settings-item:active {
    background: var(--app-bg-elevated);
}

.settings-item-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--app-radius-sm);
    background: var(--app-bg-elevated);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--app-text-secondary);
    font-size: 16px;
    flex-shrink: 0;
}

.settings-item-content {
    flex: 1;
    min-width: 0;
}

.settings-item-title {
    font-size: var(--app-font-size-md);
    font-weight: 500;
    color: var(--app-text);
}

.settings-item-subtitle {
    font-size: var(--app-font-size-sm);
    color: var(--app-text-muted);
}

.settings-item-arrow {
    color: var(--app-text-muted);
    font-size: 14px;
}

.settings-item.danger .settings-item-icon {
    background: rgba(239, 68, 68, 0.15);
    color: var(--app-danger);
}

.settings-item.danger .settings-item-title {
    color: var(--app-danger);
}

/* === Login View === */
.login-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--app-spacing-xl);
    min-height: 100vh;
    min-height: 100dvh;
    background: var(--app-bg);
}

.login-logo {
    margin-bottom: var(--app-spacing-2xl);
    text-align: center;
}

.login-logo-text {
    font-size: 36px;
    font-weight: 700;
    color: var(--app-text);
    letter-spacing: 2px;
}

.login-logo-accent {
    color: var(--app-accent);
}

.login-subtitle {
    font-size: var(--app-font-size-md);
    color: var(--app-text-secondary);
    margin-top: var(--app-spacing-sm);
}

.login-form {
    width: 100%;
    max-width: 360px;
    display: flex;
    flex-direction: column;
    gap: var(--app-spacing-md);
}

.login-input-group {
    position: relative;
}

.login-input-group i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--app-text-muted);
    font-size: 16px;
}

.login-input {
    width: 100%;
    padding: 14px 14px 14px 42px;
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius-md);
    background: var(--app-bg-input);
    color: var(--app-text);
    font-size: var(--app-font-size-md);
    font-family: var(--app-font);
    outline: none;
    transition: border-color var(--app-transition-fast);
}

.login-input:focus {
    border-color: var(--app-accent);
}

.login-input::placeholder {
    color: var(--app-text-muted);
}

.login-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--app-radius-md);
    background: var(--app-accent-gradient);
    color: #fff;
    font-size: var(--app-font-size-md);
    font-weight: 600;
    font-family: var(--app-font);
    cursor: pointer;
    transition: opacity var(--app-transition-fast);
    margin-top: var(--app-spacing-sm);
}

.login-btn:active {
    opacity: 0.8;
}

.login-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.login-error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--app-danger);
    padding: var(--app-spacing-md);
    border-radius: var(--app-radius-sm);
    font-size: var(--app-font-size-sm);
    text-align: center;
    display: none;
}

.login-footer {
    margin-top: var(--app-spacing-2xl);
    text-align: center;
}

.login-footer a {
    color: var(--app-accent);
    font-size: var(--app-font-size-sm);
}

/* === Empty States === */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--app-spacing-2xl);
    text-align: center;
    min-height: 300px;
}

.empty-state i {
    font-size: 48px;
    color: var(--app-text-muted);
    margin-bottom: var(--app-spacing-lg);
}

.empty-state h3 {
    font-size: var(--app-font-size-lg);
    font-weight: 600;
    color: var(--app-text);
    margin-bottom: var(--app-spacing-sm);
}

.empty-state p {
    font-size: var(--app-font-size-sm);
    color: var(--app-text-secondary);
    max-width: 260px;
}

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

.loading-spinner::after {
    content: '';
    width: 32px;
    height: 32px;
    border: 3px solid var(--app-border);
    border-top-color: var(--app-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--app-bg-card) 25%, var(--app-bg-elevated) 50%, var(--app-bg-card) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--app-radius-sm);
}

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

/* === Sparks View === */
.sparks-list {
    padding: var(--app-spacing-sm);
}

.spark-item {
    display: flex;
    align-items: center;
    gap: var(--app-spacing-md);
    padding: var(--app-spacing-md);
    border-radius: var(--app-radius-md);
    cursor: pointer;
    transition: background var(--app-transition-fast);
}

.spark-item:active {
    background: var(--app-bg-elevated);
}

.spark-item-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    position: relative;
}

.spark-item-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.spark-item-content {
    flex: 1;
    min-width: 0;
}

.spark-item-name {
    font-size: var(--app-font-size-md);
    font-weight: 600;
    color: var(--app-text);
}

.spark-item-type {
    font-size: var(--app-font-size-sm);
    color: var(--app-text-secondary);
    margin-top: 2px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.spark-emoji {
    font-size: 18px;
    line-height: 1;
}

.spark-item.unread {
    background: rgba(168, 85, 247, 0.06);
}

.spark-item.unread .spark-item-name {
    color: var(--app-accent);
}

.spark-item-time {
    font-size: var(--app-font-size-xs);
    color: var(--app-text-muted);
}

/* Sparks Tabs */
.sparks-tabs {
    display: flex;
    border-bottom: 1px solid var(--app-border);
    padding: 0 var(--app-spacing-md);
}

.sparks-tab {
    flex: 1;
    padding: var(--app-spacing-md) var(--app-spacing-sm);
    text-align: center;
    font-size: var(--app-font-size-sm);
    font-weight: 500;
    color: var(--app-text-muted);
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--app-transition-fast);
}

.sparks-tab.active {
    color: var(--app-accent);
    border-bottom-color: var(--app-accent);
}

/* === Image Viewer Modal === */
.image-viewer {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0,0,0,0.95);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.image-viewer.active {
    display: flex;
}

.image-viewer img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
}

.image-viewer-close {
    position: absolute;
    top: var(--app-safe-top);
    right: var(--app-spacing-md);
    padding: var(--app-spacing-lg);
    color: #fff;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 10;
}

/* === Toast Notifications === */
.app-toast {
    position: fixed;
    bottom: calc(var(--app-tabbar-height) + var(--app-safe-bottom) + 16px);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 20px;
    border-radius: var(--app-radius-md);
    background: var(--app-bg-elevated);
    border: 1px solid var(--app-border);
    color: var(--app-text);
    font-size: var(--app-font-size-sm);
    font-weight: 500;
    box-shadow: var(--app-shadow-lg);
    z-index: 500;
    opacity: 0;
    transition: all var(--app-transition-normal);
    pointer-events: none;
}

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

/* === Pull to Refresh === */
.pull-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--app-spacing-md);
    color: var(--app-text-muted);
    font-size: var(--app-font-size-sm);
    transform: translateY(-50px);
    transition: transform var(--app-transition-normal);
}

.pull-indicator.active {
    transform: translateY(0);
}

/* === Utility Classes === */
.text-accent { color: var(--app-accent); }
.text-muted { color: var(--app-text-muted); }
.text-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--app-spacing-sm); }
.gap-md { gap: var(--app-spacing-md); }
.p-md { padding: var(--app-spacing-md); }
.p-lg { padding: var(--app-spacing-lg); }
.mt-md { margin-top: var(--app-spacing-md); }
.mt-lg { margin-top: var(--app-spacing-lg); }
.hidden { display: none !important; }