/* ===== Design Tokens ===== */
:root {
    --bg: #0c0f1a;
    --bg-card: #141829;
    --bg-card-hover: #1a1f36;
    --border: rgba(255,255,255,0.06);
    --text: #e4e6f0;
    --text-muted: #7a7f9a;
    --accent: #6c5ce7;
    --accent-glow: rgba(108,92,231,0.25);
    --green: #00b894;
    --green-glow: rgba(0,184,148,0.2);
    --orange: #fdcb6e;
    --red: #ff6b6b;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
    --font: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== Layout ===== */
.app-container { max-width: 1100px; margin: 0 auto; padding: 0 20px 40px; }

/* ===== Header ===== */
.app-header {
    padding: 28px 0 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 28px;
}
.header-content { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.logo-section { display: flex; align-items: center; gap: 14px; }
.logo-icon {
    width: 46px; height: 46px;
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    border-radius: 12px;
    display: grid; place-items: center;
    box-shadow: 0 0 20px var(--accent-glow);
}
.logo-icon svg { width: 24px; height: 24px; color: #fff; }
.app-header h1 { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.02em; }
.subtitle { font-size: 0.82rem; color: var(--text-muted); }
.header-badge {
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    color: #fff; font-size: 0.72rem; font-weight: 700;
    padding: 6px 14px; border-radius: 20px;
    letter-spacing: 0.06em; text-transform: uppercase;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 22px;
    transition: border-color 0.3s;
}
.card:hover { border-color: rgba(108,92,231,0.15); }
.card-header { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 22px; }
.card-header h2 { font-size: 1.1rem; font-weight: 600; }
.card-header p { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; }
.step-badge {
    width: 34px; height: 34px; min-width: 34px;
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    border-radius: 10px; display: grid; place-items: center;
    font-weight: 700; font-size: 0.9rem; color: #fff;
}
.step-badge.success { background: linear-gradient(135deg, var(--green), #55efc4); }

/* ===== Upload Zone ===== */
.upload-zone {
    border: 2px dashed rgba(108,92,231,0.3);
    border-radius: var(--radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: rgba(108,92,231,0.03);
}
.upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--accent);
    background: rgba(108,92,231,0.08);
    box-shadow: 0 0 30px var(--accent-glow);
}
.upload-icon { margin-bottom: 14px; }
.upload-icon svg { width: 48px; height: 48px; color: var(--accent); }
.upload-text { font-weight: 600; font-size: 1rem; }
.upload-subtext { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }

/* File Info */
.file-info {
    display: flex; align-items: center; gap: 14px;
    background: rgba(108,92,231,0.08);
    border: 1px solid rgba(108,92,231,0.2);
    border-radius: var(--radius-sm);
    padding: 14px 18px; margin-top: 14px;
}
.file-icon { font-size: 1.8rem; }
.file-details { flex: 1; display: flex; flex-direction: column; }
.file-name { font-weight: 600; font-size: 0.9rem; }
.file-meta { font-size: 0.75rem; color: var(--text-muted); }
.btn-remove {
    background: none; border: none; color: var(--red);
    font-size: 1.1rem; cursor: pointer; padding: 4px 8px;
    border-radius: 6px; transition: background 0.2s;
}
.btn-remove:hover { background: rgba(255,107,107,0.15); }

/* ===== Config ===== */
.config-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 16px; margin-bottom: 24px; }
.config-item label { display: block; font-size: 0.78rem; color: var(--text-muted); margin-bottom: 6px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; }
.config-item select, .config-item input {
    width: 100%; padding: 10px 14px;
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text);
    font-family: var(--font); font-size: 0.88rem;
    transition: border-color 0.2s;
}
.config-item select:focus, .config-item input:focus { outline: none; border-color: var(--accent); }

/* Mapping */
.mapping-section { margin-bottom: 24px; }
.mapping-section h3 { font-size: 0.95rem; margin-bottom: 4px; }
.mapping-desc { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 14px; }
.mapping-table-wrap { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.mapping-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.mapping-table th {
    background: rgba(108,92,231,0.1);
    padding: 10px 14px; text-align: left;
    font-weight: 600; font-size: 0.72rem;
    text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-muted);
    white-space: nowrap;
}
.mapping-table td { padding: 10px 14px; border-top: 1px solid var(--border); }
.mapping-table tr:hover td { background: rgba(255,255,255,0.02); }
.old-val { color: var(--orange); font-family: monospace; font-size: 0.82rem; }
.new-val { color: var(--green); font-weight: 600; }
.arrow-col { text-align: center; color: var(--accent); font-size: 1.1rem; }

/* Sheet Chips */
.sheet-summary h3 { font-size: 0.95rem; margin-bottom: 12px; }
.sheet-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.sheet-chip {
    background: rgba(108,92,231,0.1);
    border: 1px solid rgba(108,92,231,0.2);
    border-radius: 20px; padding: 6px 14px;
    font-size: 0.75rem; font-weight: 500;
    display: flex; align-items: center; gap: 6px;
}
.sheet-chip .count {
    background: var(--accent); color: #fff;
    border-radius: 10px; padding: 1px 7px;
    font-size: 0.68rem; font-weight: 700;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: var(--radius-sm);
    font-family: var(--font); font-size: 0.88rem; font-weight: 600;
    border: none; cursor: pointer; transition: all 0.25s;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent), #a29bfe);
    color: #fff; box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px var(--accent-glow); }
.btn-success {
    background: linear-gradient(135deg, var(--green), #55efc4);
    color: #0c0f1a; box-shadow: 0 4px 16px var(--green-glow);
}
.btn-success:hover { transform: translateY(-2px); box-shadow: 0 6px 24px var(--green-glow); }
.btn-outline {
    background: transparent; color: var(--text);
    border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); background: rgba(108,92,231,0.08); }
.action-row, .export-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }

/* ===== Stats ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 14px; margin-bottom: 24px; }
.stat-card {
    background: rgba(108,92,231,0.06);
    border: 1px solid rgba(108,92,231,0.12);
    border-radius: var(--radius-sm);
    padding: 18px; text-align: center;
}
.stat-value { font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px; }
.stat-card.green .stat-value { color: var(--green); }
.stat-card.orange .stat-value { color: var(--orange); }

/* ===== Corrections ===== */
.corrections-section { margin-bottom: 24px; }
.corrections-section h3 { font-size: 0.95rem; margin-bottom: 12px; }
.corrections-list { display: flex; flex-direction: column; gap: 6px; max-height: 240px; overflow-y: auto; }
.correction-item {
    display: flex; align-items: center; gap: 10px;
    background: rgba(253,203,110,0.06);
    border: 1px solid rgba(253,203,110,0.15);
    border-radius: var(--radius-sm);
    padding: 8px 14px; font-size: 0.78rem;
}
.correction-item .c-old { color: var(--orange); text-decoration: line-through; }
.correction-item .c-arrow { color: var(--text-muted); }
.correction-item .c-new { color: var(--green); font-weight: 600; }
.correction-item .c-sheet { color: var(--text-muted); margin-left: auto; font-size: 0.7rem; }

/* ===== Preview Table ===== */
.preview-section { margin-bottom: 8px; }
.preview-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; }
.preview-header h3 { font-size: 0.95rem; }
.preview-controls { display: flex; align-items: center; gap: 10px; }
.preview-select {
    padding: 6px 12px; background: var(--bg);
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    color: var(--text); font-family: var(--font); font-size: 0.8rem;
}
.record-count { font-size: 0.75rem; color: var(--text-muted); }
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.8rem; }
.data-table th {
    background: rgba(0,184,148,0.1);
    padding: 10px 12px; text-align: left; font-weight: 600;
    font-size: 0.72rem; text-transform: uppercase;
    letter-spacing: 0.04em; color: var(--text-muted);
    white-space: nowrap; position: sticky; top: 0;
}
.data-table td { padding: 8px 12px; border-top: 1px solid var(--border); white-space: nowrap; }
.data-table tr:hover td { background: rgba(255,255,255,0.02); }
.data-table .corrected { color: var(--orange); position: relative; }

/* ===== Footer ===== */
.app-footer {
    text-align: center; padding: 20px 0;
    border-top: 1px solid var(--border);
    margin-top: 20px;
}
.app-footer p { font-size: 0.75rem; color: var(--text-muted); }

/* ===== Toast ===== */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 1000; display: flex; flex-direction: column; gap: 8px; }
.toast {
    padding: 14px 20px; border-radius: var(--radius-sm);
    font-size: 0.82rem; font-weight: 500;
    box-shadow: var(--shadow);
    animation: slideIn 0.35s ease-out;
    max-width: 380px;
}
.toast.success { background: var(--green); color: #0c0f1a; }
.toast.error { background: var(--red); color: #fff; }
.toast.info { background: var(--accent); color: #fff; }
@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .card { padding: 18px; }
    .header-content { flex-direction: column; align-items: flex-start; }
    .stats-grid { grid-template-columns: repeat(2,1fr); }
    .export-row { flex-direction: column; }
    .export-row .btn { width: 100%; justify-content: center; }
}