:root {
    --bg-gradient-start: #f8fafc;
    --bg-gradient-end: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --text-main: #0f172a;
    --text-muted: #475569;
    --table-header: rgba(79, 70, 229, 0.1);
    --table-row-hover: rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
}

.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15), transparent 25%),
                radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.15), transparent 25%);
    animation: pulse 15s infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

.app-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 2rem;
}

.app-header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease-out;
}

.app-header h1 {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.app-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease-out;
}

.glass-panel h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.file-drop-area {
    border: 2px dashed var(--primary-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
    background: rgba(99, 102, 241, 0.05);
    margin-bottom: 1.5rem;
}

.file-drop-area:hover, .file-drop-area.dragover {
    background: rgba(99, 102, 241, 0.1);
    border-color: #818cf8;
}

.file-message {
    font-size: 1.2rem;
    color: var(--text-muted);
    pointer-events: none;
}

#fileInput {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.hidden {
    display: none !important;
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem auto;
}

#loading {
    text-align: center;
    margin-top: 2rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

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

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.tab-content {
    display: none;
    animation: fadeInUp 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

tbody tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

th {
    background: var(--table-header);
    color: var(--text-main);
    font-weight: 600;
    white-space: nowrap;
}

tr {
    transition: background-color 0.2s ease;
}

tr:hover {
    background: var(--table-row-hover);
}

td {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: rgba(99, 102, 241, 0.5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(99, 102, 241, 0.8);
}

#sankeyChart {
    width: 100%;
    min-height: 600px;
    overflow: visible;
}

#sankeyChart svg {
    display: block;
}

.sankey-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.mapping-table {
    width: 100%;
    border-collapse: collapse;
}

.mapping-table th, .mapping-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.mapping-table th {
    background: var(--table-header);
    color: var(--text-main);
    font-weight: 600;
}


/* Keyboard navigation styles */
.mapping-table tr.active-row {
    outline: 2px solid var(--primary-color) !important;
    outline-offset: -2px;
    background-color: rgba(59, 130, 246, 0.05) !important;
}

/* Shortcut visual hints */
body.ctrl-pressed tr.active-row .btn-create .normal-text,
body.ctrl-pressed tr.active-row .btn-map .normal-text {
    display: none !important;
}
body.ctrl-pressed tr.active-row .btn-create .shortcut-text,
body.ctrl-pressed tr.active-row .btn-map .shortcut-text {
    display: inline !important;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    max-width: 500px;
    width: 90%;
    text-align: center;
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.95);
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    border-bottom: none;
    padding-bottom: 0;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}