:root {
    --bg-dark: #0a0f1c;
    --bg-darker: #060912;
    --bg-card: #111827;
    --bg-card-hover: #1a2435;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.4);
    --accent-soft: rgba(59, 130, 246, 0.1);
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --border: #1e293b;
    --border-hover: #334155;
    --glass: rgba(17, 24, 39, 0.85);
    --glass-border: rgba(255, 255, 255, 0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(145deg, var(--bg-darker) 0%, var(--bg-dark) 50%, #0d1424 100%);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 4px;
    transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.app-container {
    width: 100%;
    max-width: 1280px;
    padding: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1.25rem 1.75rem;
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.logo h1 {
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.highlight {
    background: linear-gradient(135deg, var(--accent), #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn:hover::before {
    opacity: 1;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    color: white;
    box-shadow: 0 0 20px var(--accent-glow);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 24px var(--accent-glow);
}

.btn.primary:active {
    transform: translateY(0);
}

.btn svg {
    flex-shrink: 0;
}

.filters {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 2rem;
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    align-items: flex-end;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.input-group.search-group {
    flex: 2;
    position: relative;
}

label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input {
    background: var(--bg-darker);
    border: 1px solid var(--border);
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    width: 100%;
    transition: all var(--transition-base);
}

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

input:hover {
    border-color: var(--border-hover);
}

input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-icon {
    position: absolute;
    right: 1rem;
    bottom: 0.9rem;
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.search-group input:focus + .search-icon {
    color: var(--accent);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.25rem;
    animation: fadeIn var(--transition-slow) ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), #60a5fa, var(--accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border);
}

.card-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-variant-numeric: tabular-nums;
}

.card-badge {
    background: var(--accent-soft);
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-body {
    font-size: 0.9rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
}

.info-row:last-of-type {
    border-bottom: none;
}

.info-row .label {
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: none;
    letter-spacing: normal;
}

.info-row .value {
    font-weight: 500;
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.user-data-block {
    margin-top: 1rem;
    padding: 0.875rem 1rem;
    background: linear-gradient(135deg, var(--accent-soft), rgba(96, 165, 250, 0.05));
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.user-data-block strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.raw-data {
    margin-top: 1rem;
    background: var(--bg-darker);
    padding: 1rem;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
    font-size: 0.75rem;
    color: #4ade80;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 120px;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 1;
    visibility: visible;
    transition: all var(--transition-slow);
}

.modal.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal.hidden .modal-content {
    transform: scale(0.95) translateY(20px);
}

.modal-content {
    background: var(--bg-card);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: scale(1) translateY(0);
    transition: transform var(--transition-slow);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

textarea {
    width: 100%;
    min-height: 280px;
    background: var(--bg-darker);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 1rem;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
    font-size: 0.85rem;
    resize: vertical;
    margin-bottom: 1rem;
    transition: all var(--transition-base);
    line-height: 1.5;
}

textarea::placeholder {
    color: var(--text-muted);
}

textarea:hover {
    border-color: var(--border-hover);
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.close-btn {
    background: transparent;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    font-size: 1rem;
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-darker) 100%);
}

@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }

    header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .filters {
        flex-direction: column;
        gap: 1rem;
    }

    .input-group,
    .input-group.search-group {
        flex: none;
        width: 100%;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        padding: 1.5rem;
        margin: 1rem;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.25rem;
    }

    .btn {
        width: 100%;
    }

    .card {
        padding: 1.25rem;
    }
}

/* Acknowledged State */
.card.acknowledged {
    border-color: rgba(34, 197, 94, 0.4);
    background: linear-gradient(145deg, rgba(34, 197, 94, 0.05), var(--bg-card));
}

.card.acknowledged .card-header {
    border-bottom-color: rgba(34, 197, 94, 0.2);
}

.card.acknowledged .card-badge {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

.card.acknowledged::before {
    background: linear-gradient(90deg, var(--success), #4ade80, var(--success));
    opacity: 0.5;
}

.ack-actions {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--border);
    display: flex;
    justify-content: flex-end;
}

.btn.ack-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.btn.ack-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.btn.ack-btn.is-active {
    border-color: var(--success);
    color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

.btn.ack-btn.is-active:hover {
    border-color: #ef4444;
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

.btn.ack-btn.is-active:hover::after {
    content: "Undo";
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: inherit;
    font-weight: 600;
}

.btn.ack-btn.is-active:hover span {
    opacity: 0;
}