html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow-x: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    scroll-behavior: smooth;
}

/* Dark mode (default) */
:root {
    --page-bg: #000000;
    --page-text: #ffffff;
    --card-bg: #1a1a1a;
    --card-border: #333333;
    --card-shadow: rgba(0, 0, 0, 0.5);
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --input-bg: #2a2a2a;
    --input-border: #444444;
    --success: #2ecc71;
    --danger: #e74c3c;
    --warning: #f39c12;
}

/* Light mode */
[data-theme="light"] {
    --page-bg: #f5f7fa;
    --page-text: #2c3e50;
    --card-bg: #ffffff;
    --card-border: #e0e0e0;
    --card-shadow: rgba(0, 0, 0, 0.1);
    --text-secondary: #7f8c8d;
    --text-muted: #95a5a6;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --input-bg: #f8f9fa;
    --input-border: #dcdcdc;
    --success: #27ae60;
    --danger: #c0392b;
    --warning: #e67e22;
}

body {
    display: flex;
    flex-direction: column;
    position: relative;
    min-height: 100vh;
    background: var(--page-bg);
    color: var(--page-text);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.flex-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.container {
    position: relative;
    z-index: 2;
    padding: 40px 20px;
    text-align: center;
    animation: fadeIn 1s ease-in-out forwards;
    max-width: 1400px;
    margin: 0 auto;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--page-text);
}

.subtitle {
    font-size: 1.2rem;
    font-weight: 400;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
}

.settings-card {
    background: var(--card-bg);
    padding: 30px;
    margin: 15px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--card-shadow);
    width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    border: 1px solid var(--card-border);
}

.settings-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--card-shadow);
}

.settings-card h3 {
    margin-top: 0;
    color: var(--accent-primary);
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.settings-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 20px;
}

/* Drag and Drop Zone */
.drop-zone {
    border: 2px dashed var(--input-border);
    border-radius: 15px;
    padding: 40px 20px;
    text-align: center;
    transition: all 0.3s ease;
    background: var(--input-bg);
    width: 100%;
}

.drop-zone:hover {
    border-color: var(--accent-primary);
    background: var(--card-bg);
}

.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    transform: scale(1.02);
}

.upload-icon {
    color: var(--accent-primary);
    margin-bottom: 15px;
}

.drop-zone-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--page-text);
    margin: 10px 0 5px 0;
}

.drop-zone-or {
    color: var(--text-muted);
    margin: 15px 0;
    font-size: 0.9rem;
}

/* File Info Display */
.file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    background: var(--input-bg);
    border-radius: 10px;
    border: 1px solid var(--input-border);
    margin-top: 15px;
    width: 100%;
    box-sizing: border-box;
}

.file-icon {
    color: var(--success);
    flex-shrink: 0;
}

#inputFileName {
    flex: 1;
    font-size: 0.95rem;
    color: var(--page-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.remove-file-btn {
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.remove-file-btn:hover {
    background: #c0392b;
    transform: rotate(90deg);
}

/* Buttons */
.browse-btn, .generate-btn {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.browse-btn:hover, .generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.browse-btn:active, .generate-btn:active {
    transform: translateY(0);
}

.generate-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.generate-btn {
    width: 100%;
    padding: 15px 30px;
    font-size: 1.1rem;
}

.btn-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

/* Spinner Animation */
.spinner {
    animation: spin 1s linear infinite;
}

.spinner-circle {
    stroke-dasharray: 50;
    stroke-dashoffset: 25;
    animation: dash 1.5s ease-in-out infinite;
}

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

@keyframes dash {
    0% {
        stroke-dashoffset: 50;
    }
    50% {
        stroke-dashoffset: 12.5;
    }
    100% {
        stroke-dashoffset: 50;
    }
}

.checkbox-container {
    text-align: left;
    margin-top: 15px;
    width: 100%;
}

.checkbox-container label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    color: var(--page-text);
    cursor: pointer;
    font-size: 0.95rem;
    padding: 8px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.checkbox-container label:hover {
    background-color: var(--input-bg);
}

.checkbox-container input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-primary);
    flex-shrink: 0;
}

/* Bank Format Select */
.bank-format-select {
    width: 100%;
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid var(--input-border);
    border-radius: 10px;
    background-color: var(--input-bg);
    color: var(--page-text);
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    margin-top: 10px;
}

.bank-format-select:hover {
    border-color: var(--accent-primary);
}

.bank-format-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.bank-format-select option {
    background-color: var(--input-bg);
    color: var(--page-text);
    padding: 10px;
}

.status-container {
    margin-top: 40px;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--card-shadow);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    border: 1px solid var(--card-border);
    transition: background-color 0.3s ease;
}

#statusLabel {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--page-text);
    font-weight: 600;
}

.progress-bar-container {
    width: 100%;
    background-color: var(--input-bg);
    border-radius: 10px;
    margin-bottom: 20px;
    overflow: hidden;
    border: 1px solid var(--input-border);
}

.progress-bar {
    width: 0%;
    height: 25px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    transition: width 0.3s ease;
}

.log-container {
    text-align: left;
}

.log-container h3 {
    color: var(--accent-primary);
    font-size: 1.2rem;
    margin-bottom: 10px;
}

#log-textbox {
    width: 100%;
    height: 150px;
    background-color: var(--input-bg);
    color: var(--page-text);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    padding: 15px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    overflow-y: auto;
    line-height: 1.5;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

[data-theme="light"] body {
    background-color: #f0f5fa !important;
    color: #1f2937 !important
}

[data-theme="light"] .container {
    background-color: #ffffff !important;
    color: #1f2937 !important
}

[data-theme="light"] table {
    background-color: #ffffff !important;
    color: #1f2937 !important;
    border-color: #d1d5db !important
}

[data-theme="light"] th {
    background-color: #f3f4f6 !important;
    color: #2563eb !important;
    border-color: #d1d5db !important
}

[data-theme="light"] td {
    border-color: #d1d5db !important;
    color: #1f2937 !important
}

[data-theme="light"] input {
    background-color: #ffffff !important;
    color: #1f2937 !important;
    border-color: #d1d5db !important
}

[data-theme="light"] button {
    background-color: #2563eb !important;
    color: #fff !important
}

[data-theme="light"] button:hover {
    background-color: #1d4ed8 !important
}

[data-theme="light"] .description {
    color: #4b5563 !important
}