:root {
    --bg-color: #faf8ff;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --primary-blue: #2563eb;
    --primary-blue-hover: #1d4ed8;
    --drop-bg: #f5f7ff;
    --drop-border: #cbd5e1;
    --advanced-bg: #eff4ff;
    --advanced-border: #dbeafe;
    --red: #ef4444;
}

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

img {
    max-width: 100%;
    height: auto;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px;
}

.app-header {
    margin-bottom: 32px;
}

.app-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.app-header p {
    color: var(--text-muted);
    font-size: 16px;
}

.main-layout {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: 24px;
}

.left-col, .right-col {
    min-width: 0;
    width: 100%;
}

/* Cards Generic */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-main);
}

.card-title i {
    color: var(--primary-blue);
    font-size: 20px;
}

/* Left Column */
.editor-card {
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.editor-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.editor-actions {
    display: flex;
    gap: 16px;
}

.action-btn {
    background: none;
    border: none;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: opacity 0.2s;
}

.action-btn:hover {
    opacity: 0.8;
}

.text-blue {
    color: var(--primary-blue);
}

.text-red {
    color: var(--red);
}

.text-gray {
    color: var(--text-muted);
}

#editor-container {
    height: 280px;
    font-family: inherit;
    font-size: 15px;
}

.ql-toolbar.ql-snow {
    border: none;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 20px;
}

.ql-container.ql-snow {
    border: none;
    font-family: inherit;
}

.ql-editor {
    padding: 20px;
    font-size: 15px;
    color: var(--text-main);
}

.ql-editor.ql-blank::before {
    color: #9ca3af;
    font-style: normal;
}

.drop-zone {
    background-color: var(--drop-bg);
    border: 2px dashed var(--drop-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.drop-zone:hover, .drop-zone.drag-active {
    background-color: #e8edff;
    border-color: #94a3b8;
}

.drop-icon {
    font-size: 32px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.drop-zone h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.drop-zone p {
    font-size: 13px;
    color: var(--text-muted);
}

.stats-container {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    flex: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.stat-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-blue);
}

.banner-placeholder {
    border-radius: 8px;
    margin-bottom: 24px;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
    display: block;
    box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.banner-placeholder a {
    display: block;
    width: 100%;
    max-width: 100%;
    line-height: 0;
}

.banner-placeholder img {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
    object-fit: cover;
    transition: transform 0.2s ease;
}

.banner-placeholder a:hover img {
    transform: scale(1.01);
}

.tools-card {
    padding: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.grid-1 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.tool-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: #374151;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.tool-btn:hover {
    background: #f9fafb;
    border-color: #d1d5db;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

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

.advanced-card {
    background-color: var(--advanced-bg);
    border-color: var(--advanced-border);
    text-align: center;
    padding: 24px;
}

.btn-primary {
    background-color: var(--primary-blue);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    width: 100%;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-bottom: 12px;
}

.btn-primary:hover {
    background-color: var(--primary-blue-hover);
}

.advanced-subtext {
    font-size: 13px;
    color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    .stats-container {
        flex-wrap: wrap;
    }
    .stat-card {
        flex-basis: calc(50% - 8px);
    }
}

@media (max-width: 500px) {
    .grid-3, .grid-2 {
        grid-template-columns: 1fr;
    }
    .stat-card {
        flex-basis: 100%;
    }
}

/* Find & Replace */
.find-replace-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fr-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.fr-input:focus {
    border-color: var(--primary-blue);
}

.fr-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.fr-checkbox {
    font-size: 14px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}