:root {
    --csv-ink: #0f172a;
    --csv-muted: #64748b;
    --csv-line: rgba(30, 41, 59, .12);
    --csv-green: #16a34a;
    --csv-teal: #0d9488;
    --csv-blue: #2563eb;
}

body.csv-converter-page {
    min-height: 100vh;
    font-family: Inter, "Noto Sans KR", system-ui, sans-serif;
    color: var(--csv-ink);
    background:
        radial-gradient(circle at 5% 16%, rgba(22, 163, 74, .12), transparent 26rem),
        radial-gradient(circle at 95% 8%, rgba(13, 148, 136, .16), transparent 28rem),
        linear-gradient(180deg, #f8fdf8 0%, #ffffff 48%, #f0fdf4 100%);
}

.csv-header {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.csv-header .logo {
    text-decoration: none;
    white-space: nowrap;
}

.csv-header .top-nav {
    gap: clamp(.7rem, 1.2vw, 1.1rem);
    flex-wrap: nowrap;
}

.csv-header .tools-dropdown.mega-tools {
    right: 0;
    left: auto;
    width: min(980px, calc(100vw - 2rem));
    grid-template-columns: repeat(5, minmax(130px, 1fr));
}

.csv-header .tools-dropdown {
    max-height: min(72vh, 620px);
    overflow: auto;
}

.csv-header .ec-tool-search {
    min-width: min(12rem, 16vw);
}

.csv-main {
    width: min(1180px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1.4rem 0 4rem;
}

.csv-breadcrumb {
    display: flex;
    align-items: center;
    gap: .65rem;
    color: var(--csv-muted);
    font-size: .9rem;
    font-weight: 800;
}

.csv-breadcrumb a {
    color: inherit;
    text-decoration: none;
}

.csv-hero {
    text-align: center;
    padding: 2.3rem 1rem 2.7rem;
}

.csv-flow-icon {
    display: inline-flex;
    align-items: center;
    gap: .75rem;
    margin-bottom: 1.1rem;
    color: var(--csv-green);
}

.csv-flow-icon span {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border-radius: 16px;
    background: rgba(255, 255, 255, .88);
    box-shadow: 0 14px 32px rgba(22, 163, 74, .12);
}

.csv-hero h1 {
    margin: 0;
    font-size: clamp(2.15rem, 5.3vw, 4.1rem);
    line-height: 1;
    font-weight: 900;
    letter-spacing: 0;
}

.csv-hero h1 span {
    color: var(--csv-green);
}

.csv-hero > p {
    max-width: 720px;
    margin: 1rem auto 0;
    color: #475569;
    font-size: 1.05rem;
    line-height: 1.65;
}

.csv-benefits {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: .75rem;
    margin-top: 1.5rem;
}

.csv-benefits span {
    display: inline-flex;
    align-items: center;
    gap: .45rem;
    padding: .5rem .8rem;
    border: 1px solid rgba(22, 163, 74, .09);
    border-radius: 999px;
    color: #15803d;
    background: rgba(255, 255, 255, .72);
    font-weight: 850;
    font-size: .86rem;
}

/* ── Mode selector ── */
.csv-mode-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: .5rem;
    margin-bottom: 1.5rem;
}

.csv-mode-tabs button {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    min-height: 2.6rem;
    border: 1px solid var(--csv-line);
    border-radius: 12px;
    padding: .55rem 1rem;
    color: #334155;
    background: rgba(255, 255, 255, .8);
    font: inherit;
    font-weight: 850;
    font-size: .88rem;
    cursor: pointer;
    transition: border-color .2s, color .2s, background .2s;
}

.csv-mode-tabs button.active {
    color: #fff;
    border-color: var(--csv-green);
    background: linear-gradient(135deg, var(--csv-green), var(--csv-teal));
    box-shadow: 0 8px 22px rgba(22, 163, 74, .18);
}

.csv-mode-tabs button:not(.active):hover {
    border-color: var(--csv-green);
    color: var(--csv-green);
}

/* ── Workspace ── */
.csv-workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 1.25rem;
}

.csv-input-card,
.csv-output-card,
.csv-info-grid article {
    border: 1px solid var(--csv-line);
    border-radius: 22px;
    background: rgba(255, 255, 255, .9);
    box-shadow: 0 26px 70px rgba(22, 163, 74, .08);
}

.csv-input-card,
.csv-output-card {
    min-width: 0;
    padding: 1.25rem;
}

.csv-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.csv-toolbar p {
    margin: 0 0 .25rem;
    color: var(--csv-green);
    font-size: .78rem;
    font-weight: 900;
    text-transform: uppercase;
}

.csv-toolbar h2 {
    margin: 0;
    font-size: 1.1rem;
}

.csv-toolbar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    justify-content: flex-end;
}

.csv-toolbar-actions button,
.csv-file-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .45rem;
    min-height: 2.5rem;
    border: 1px solid var(--csv-line);
    border-radius: 10px;
    padding: .55rem .75rem;
    color: #334155;
    background: white;
    font: inherit;
    font-weight: 850;
    cursor: pointer;
}

.csv-toolbar-actions button:disabled {
    opacity: .5;
    cursor: not-allowed;
}

/* ── Drop zone ── */
.csv-drop-zone {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    min-height: 220px;
    border: 2px dashed rgba(22, 163, 74, .28);
    border-radius: 16px;
    background: rgba(240, 253, 244, .5);
    padding: 2rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s, background .2s;
}

.csv-drop-zone:hover,
.csv-drop-zone.dragging {
    border-color: var(--csv-green);
    background: rgba(240, 253, 244, .8);
}

.csv-drop-zone i.csv-drop-icon {
    display: grid;
    place-items: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 18px;
    color: var(--csv-green);
    background: rgba(22, 163, 74, .1);
    font-size: 1.4rem;
}

.csv-drop-zone strong {
    font-size: 1rem;
    color: var(--csv-ink);
}

.csv-drop-zone span {
    color: var(--csv-muted);
    font-size: .88rem;
}

.csv-drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.csv-file-name {
    margin: .75rem 0 0;
    padding: .55rem .85rem;
    border: 1px solid var(--csv-line);
    border-radius: 10px;
    background: rgba(248, 250, 252, .8);
    color: var(--csv-muted);
    font-size: .88rem;
    font-weight: 700;
    text-align: center;
    word-break: break-all;
}

/* ── Textareas ── */
.csv-input-card textarea,
.csv-output-card textarea {
    width: 100%;
    border: 1px solid rgba(30, 41, 59, .14);
    border-radius: 14px;
    padding: 1rem;
    color: #0f172a;
    background: rgba(248, 250, 252, .82);
    font: 700 .92rem/1.6 Consolas, "Courier New", monospace;
    outline: none;
    resize: vertical;
}

.csv-input-card textarea {
    min-height: 300px;
}

.csv-output-card textarea {
    min-height: 150px;
    margin-top: 1rem;
}

.csv-input-card textarea:focus,
.csv-output-card textarea:focus {
    border-color: rgba(22, 163, 74, .5);
    box-shadow: 0 0 0 4px rgba(22, 163, 74, .1);
}

/* ── Options bar ── */
.csv-options {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin: 1rem 0;
}

.csv-options label {
    display: flex;
    align-items: center;
    gap: .5rem;
    min-height: 2.8rem;
    border: 1px solid rgba(30, 41, 59, .1);
    border-radius: 12px;
    padding: .55rem .75rem;
    color: #334155;
    background: rgba(255, 255, 255, .78);
    font-weight: 850;
}

.csv-options select {
    min-width: 0;
    border: 0;
    background: transparent;
    color: #0f172a;
    font: inherit;
    font-weight: 850;
    outline: none;
}

/* ── Convert button ── */
.csv-convert-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    width: 100%;
    min-height: 3.35rem;
    border: 0;
    border-radius: 12px;
    color: white;
    background: linear-gradient(135deg, var(--csv-green), var(--csv-teal));
    box-shadow: 0 18px 34px rgba(22, 163, 74, .2);
    font: inherit;
    font-weight: 900;
    cursor: pointer;
    transition: opacity .2s;
}

.csv-convert-button:hover {
    opacity: .92;
}

/* ── Status ── */
.csv-status {
    min-height: 1.5rem;
    margin: .85rem 0 0;
    color: var(--csv-muted);
    font-weight: 800;
}

.csv-status.success {
    color: var(--csv-green);
}

.csv-status.error {
    color: #dc2626;
}

/* ── Preview table ── */
.csv-preview-shell {
    position: relative;
    overflow: auto;
    min-height: 360px;
    max-height: 360px;
    border: 1px solid rgba(30, 41, 59, .12);
    border-radius: 14px;
    background: white;
}

.csv-preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .86rem;
}

.csv-preview-table th,
.csv-preview-table td {
    max-width: 220px;
    padding: .72rem .8rem;
    border-bottom: 1px solid rgba(30, 41, 59, .08);
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.csv-preview-table th {
    position: sticky;
    top: 0;
    z-index: 1;
    color: #14532d;
    background: #f0fdf4;
    font-weight: 900;
}

.csv-empty-state {
    position: absolute;
    inset: 0;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: .45rem;
    color: var(--csv-muted);
    text-align: center;
}

.csv-empty-state i {
    display: grid;
    place-items: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 18px;
    color: var(--csv-green);
    background: rgba(22, 163, 74, .1);
    font-size: 1.3rem;
}

.csv-empty-state[hidden] {
    display: none;
}

/* ── Info grid ── */
.csv-info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}

.csv-info-grid article {
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: .85rem;
    align-items: center;
    padding: 1.1rem;
}

.csv-info-grid i {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border-radius: 16px;
    color: var(--csv-green);
    background: rgba(22, 163, 74, .1);
}

.csv-info-grid strong,
.csv-info-grid span {
    grid-column: 2;
}

.csv-info-grid span {
    color: var(--csv-muted);
    font-size: .9rem;
    line-height: 1.5;
}

/* ── Responsive ── */
@media (max-width: 980px) {
    .csv-header .top-nav {
        flex-wrap: wrap;
        justify-content: flex-start !important;
    }

    .csv-header .ec-tool-search {
        order: 20;
        width: min(100%, 18rem);
    }

    .csv-workspace,
    .csv-info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .csv-main {
        width: min(100% - 1rem, 1180px);
    }

    .csv-hero {
        padding: 1.7rem .35rem 2rem;
    }

    .csv-input-card,
    .csv-output-card {
        padding: 1rem;
    }

    .csv-toolbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .csv-toolbar-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .csv-mode-tabs {
        gap: .35rem;
    }

    .csv-mode-tabs button {
        font-size: .8rem;
        padding: .45rem .7rem;
    }
}