/* =============================================================
   CSV to Excel Converter — Frontend Styles
   ============================================================= */

:root {
    --cte-blue:        #2563eb;
    --cte-blue-dark:   #1d4ed8;
    --cte-blue-light:  #eff6ff;
    --cte-green:       #16a34a;
    --cte-green-dark:  #15803d;
    --cte-green-light: #f0fdf4;
    --cte-red:         #dc2626;
    --cte-red-light:   #fef2f2;
    --cte-border:      #e2e8f0;
    --cte-bg:          #f8fafc;
    --cte-text:        #1e293b;
    --cte-muted:       #64748b;
    --cte-radius:      12px;
    --cte-shadow:      0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
}

/* ── Wrapper ─────────────────────────────────────────────────── */
.cte-wrap {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 14px;
    color: var(--cte-text);
    background: #fff;
    border: 1px solid var(--cte-border);
    border-radius: var(--cte-radius);
    padding: 28px;
    max-width: 860px;
    margin: 24px auto;
    box-shadow: var(--cte-shadow);
}

/* ── Header ──────────────────────────────────────────────────── */
.cte-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--cte-border);
}
.cte-header-icon { flex-shrink: 0; }
.cte-title {
    margin: 0 0 4px;
    font-size: 20px;
    font-weight: 700;
    color: var(--cte-text);
    line-height: 1.2;
}
.cte-subtitle {
    margin: 0;
    color: var(--cte-muted);
    font-size: 13px;
}

/* ── Tabs ────────────────────────────────────────────────────── */
.cte-tabs {
    display: flex;
    gap: 4px;
    background: var(--cte-bg);
    border: 1px solid var(--cte-border);
    border-radius: 8px;
    padding: 4px;
    margin-bottom: 20px;
}
.cte-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--cte-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all .15s ease;
}
.cte-tab:hover { color: var(--cte-blue); background: rgba(37,99,235,.06); }
.cte-tab.active {
    background: #fff;
    color: var(--cte-blue);
    box-shadow: 0 1px 4px rgba(0,0,0,.1);
}

/* ── Drop Zone ───────────────────────────────────────────────── */
.cte-drop-zone {
    border: 2px dashed var(--cte-border);
    border-radius: var(--cte-radius);
    background: var(--cte-bg);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all .2s ease;
}
.cte-drop-zone:hover,
.cte-drop-zone.dragover {
    border-color: var(--cte-blue);
    background: var(--cte-blue-light);
}
.cte-drop-icon {
    color: var(--cte-muted);
    margin-bottom: 12px;
}
.cte-drop-zone.dragover .cte-drop-icon { color: var(--cte-blue); }
.cte-drop-text {
    margin: 0 0 4px;
    font-size: 15px;
    font-weight: 600;
    color: var(--cte-text);
}
.cte-drop-sub {
    margin: 0 0 12px;
    color: var(--cte-muted);
    font-size: 13px;
}
.cte-drop-hint {
    margin: 12px 0 0;
    color: var(--cte-muted);
    font-size: 12px;
}

/* ── File Info ───────────────────────────────────────────────── */
.cte-file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--cte-green-light);
    border: 1px solid #bbf7d0;
    border-radius: 8px;
    margin-top: 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--cte-green);
}
#cte-file-name { flex: 1; }
.cte-clear-btn {
    background: none;
    border: 1px solid #86efac;
    color: var(--cte-green);
    border-radius: 4px;
    padding: 3px 8px;
    cursor: pointer;
    font-size: 12px;
    transition: all .15s;
}
.cte-clear-btn:hover { background: #dcfce7; }

/* ── Textarea ────────────────────────────────────────────────── */
.cte-textarea {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--cte-border);
    border-radius: 8px;
    padding: 14px;
    font-size: 13px;
    font-family: "Cascadia Code", "Fira Code", "Courier New", monospace;
    color: var(--cte-text);
    background: var(--cte-bg);
    resize: vertical;
    transition: border-color .15s;
    line-height: 1.6;
}
.cte-textarea:focus {
    outline: none;
    border-color: var(--cte-blue);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

/* ── Options ─────────────────────────────────────────────────── */
.cte-options {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.cte-option-group { flex: 1; min-width: 200px; }
.cte-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--cte-muted);
    margin-bottom: 6px;
}
.cte-input-wrap { display: flex; align-items: stretch; }
.cte-input {
    flex: 1;
    border: 1px solid var(--cte-border);
    border-right: none;
    border-radius: 8px 0 0 8px;
    padding: 9px 12px;
    font-size: 13px;
    color: var(--cte-text);
    transition: border-color .15s;
}
.cte-input:focus { outline: none; border-color: var(--cte-blue); }
.cte-input-ext {
    background: var(--cte-bg);
    border: 1px solid var(--cte-border);
    border-left: none;
    border-radius: 0 8px 8px 0;
    padding: 9px 12px;
    font-size: 12px;
    color: var(--cte-muted);
    font-weight: 500;
    white-space: nowrap;
}
.cte-radio-group {
    display: flex;
    gap: 16px;
    padding-top: 6px;
}
.cte-radio-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
}
.cte-badge {
    background: var(--cte-blue);
    color: #fff;
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: .04em;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.cte-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all .15s ease;
    text-decoration: none;
    line-height: 1;
}
.cte-btn-primary {
    background: var(--cte-blue);
    color: #fff;
}
.cte-btn-primary:hover { background: var(--cte-blue-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(37,99,235,.3); }
.cte-btn-primary:active { transform: translateY(0); }

.cte-btn-outline {
    background: #fff;
    color: var(--cte-blue);
    border: 1px solid var(--cte-blue);
}
.cte-btn-outline:hover { background: var(--cte-blue-light); }

.cte-btn-success {
    background: var(--cte-green);
    color: #fff;
    font-size: 15px;
    padding: 12px 28px;
}
.cte-btn-success:hover { background: var(--cte-green-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(22,163,74,.3); }

.cte-btn:disabled { opacity: .6; cursor: not-allowed; transform: none !important; }

/* ── Actions ─────────────────────────────────────────────────── */
.cte-actions {
    display: flex;
    justify-content: center;
    margin-top: 24px;
}

/* ── Status ──────────────────────────────────────────────────── */
.cte-status {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
}
.cte-status.success {
    background: var(--cte-green-light);
    border: 1px solid #bbf7d0;
    color: var(--cte-green);
}
.cte-status.error {
    background: var(--cte-red-light);
    border: 1px solid #fecaca;
    color: var(--cte-red);
}
.cte-status.info {
    background: var(--cte-blue-light);
    border: 1px solid #bfdbfe;
    color: var(--cte-blue);
}

/* ── Loader ──────────────────────────────────────────────────── */
.cte-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 24px;
    color: var(--cte-muted);
    font-size: 14px;
    font-weight: 500;
}
.cte-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--cte-border);
    border-top-color: var(--cte-blue);
    border-radius: 50%;
    animation: cte-spin .7s linear infinite;
}
@keyframes cte-spin { to { transform: rotate(360deg); } }

/* ── Preview ─────────────────────────────────────────────────── */
.cte-preview-wrap {
    margin-top: 24px;
    border: 1px solid var(--cte-border);
    border-radius: var(--cte-radius);
    overflow: hidden;
}
.cte-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--cte-bg);
    border-bottom: 1px solid var(--cte-border);
}
.cte-preview-meta {
    display: flex;
    align-items: center;
    gap: 7px;
    color: var(--cte-muted);
    font-size: 13px;
    font-weight: 500;
}
.cte-delimiter-badge {
    background: #e0e7ff;
    color: #4338ca;
    border-radius: 4px;
    padding: 3px 10px;
    font-size: 12px;
    font-weight: 600;
}
.cte-table-scroll {
    overflow-x: auto;
    max-height: 440px;
    overflow-y: auto;
}
.cte-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.cte-table thead th {
    position: sticky;
    top: 0;
    background: #1e293b;
    color: #fff;
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
    border-right: 1px solid #334155;
    z-index: 1;
}
.cte-table thead th:first-child { width: 40px; }
.cte-table tbody tr:nth-child(even) { background: var(--cte-bg); }
.cte-table tbody tr:hover { background: var(--cte-blue-light); }
.cte-table td {
    padding: 9px 14px;
    border-bottom: 1px solid var(--cte-border);
    border-right: 1px solid var(--cte-border);
    white-space: nowrap;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--cte-text);
}
.cte-table td:first-child { color: var(--cte-muted); font-size: 12px; text-align: center; }

/* ── Download Row ────────────────────────────────────────────── */
.cte-download-row {
    padding: 16px;
    background: var(--cte-green-light);
    border-top: 1px solid #bbf7d0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 600px) {
    .cte-wrap { padding: 16px; margin: 12px; }
    .cte-header { gap: 10px; }
    .cte-title { font-size: 17px; }
    .cte-options { flex-direction: column; gap: 12px; }
    .cte-preview-wrap { border-radius: 8px; }
}