.line-deduplicator {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 86px 0 44px;
    box-sizing: border-box;
}

.line-deduplicator *,
.line-deduplicator *::before,
.line-deduplicator *::after {
    box-sizing: border-box;
}

.dedupe-hero {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 24px;
    padding: 26px;
    background:
        linear-gradient(135deg, rgba(74, 108, 247, 0.14), rgba(22, 219, 147, 0.10)),
        var(--card-light, #fff);
    border: 1px solid rgba(74, 108, 247, 0.16);
    border-radius: 24px;
    box-shadow: 0 18px 45px rgba(74, 108, 247, 0.12);
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 10px;
    color: var(--primary-color);
    font-weight: 800;
    letter-spacing: 0.04em;
}

.dedupe-hero h1 {
    margin: 0;
    color: var(--text-light, #2c3e50);
    font-size: clamp(2rem, 4vw, 3.2rem);
    line-height: 1.12;
}

.hero-description {
    max-width: 720px;
    margin: 14px 0 0;
    color: var(--text-secondary-light, #64748b);
    font-size: 1rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
    padding: 12px 16px;
    color: #14532d;
    background: rgba(22, 219, 147, 0.16);
    border: 1px solid rgba(22, 163, 74, 0.22);
    border-radius: 999px;
    font-weight: 800;
    white-space: nowrap;
}

.dedupe-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(360px, 0.92fr);
    gap: 24px;
    align-items: stretch;
}

.dedupe-card {
    min-width: 0;
    padding: 24px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 24px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
    backdrop-filter: blur(12px);
}

.input-card,
.result-card {
    display: flex;
    flex-direction: column;
}

.card-heading,
.result-toolbar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 16px;
}

.card-heading h2,
.result-toolbar h2 {
    margin: 0;
    color: var(--text-light, #2c3e50);
    font-size: 1.35rem;
}

.card-heading p,
.result-toolbar p {
    margin: 6px 0 0;
    color: var(--text-secondary-light, #64748b);
    font-size: 0.94rem;
}

.line-counter {
    flex: 0 0 auto;
    padding: 6px 12px;
    color: var(--primary-dark, #3a56d4);
    background: rgba(74, 108, 247, 0.10);
    border-radius: 999px;
    font-size: 0.86rem;
    font-weight: 800;
}

.textarea-label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-light, #2c3e50);
    font-weight: 800;
}

.line-deduplicator textarea {
    width: 100%;
    min-height: 390px;
    padding: 16px;
    color: #0f172a;
    background: #f8fafc;
    border: 2px solid rgba(148, 163, 184, 0.28);
    border-radius: 18px;
    outline: none;
    resize: vertical;
    font: 500 14px/1.65 "Consolas", "SFMono-Regular", "Menlo", monospace;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.line-deduplicator textarea:focus {
    background: #fff;
    border-color: var(--primary-color, #4A6CF7);
    box-shadow: 0 0 0 4px rgba(74, 108, 247, 0.12);
}

#result-lines {
    flex: 1;
    min-height: 330px;
}

.option-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 16px 0 18px;
}

.checkbox-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    color: var(--text-light, #2c3e50);
    background: rgba(74, 108, 247, 0.06);
    border: 1px solid rgba(74, 108, 247, 0.14);
    border-radius: 999px;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.checkbox-item:hover {
    background: rgba(74, 108, 247, 0.11);
    border-color: rgba(74, 108, 247, 0.26);
}

.checkbox-item input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color, #4A6CF7);
    cursor: pointer;
}

.action-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: auto;
}

.primary-btn,
.secondary-btn,
.ghost-btn,
.copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 11px 16px;
    border-radius: 14px;
    border: 0;
    cursor: pointer;
    font-weight: 800;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease, opacity 0.18s ease;
}

.primary-btn {
    color: #fff;
    background: linear-gradient(135deg, var(--primary-color, #4A6CF7), #2563eb);
    box-shadow: 0 12px 24px rgba(74, 108, 247, 0.25);
}

.secondary-btn {
    color: #075985;
    background: rgba(14, 165, 233, 0.12);
}

.ghost-btn {
    color: #b42318;
    background: rgba(239, 68, 68, 0.10);
}

.copy-btn {
    flex: 0 0 auto;
    color: #fff;
    background: linear-gradient(135deg, #16a34a, #059669);
    box-shadow: 0 12px 24px rgba(22, 163, 74, 0.20);
}

.primary-btn:hover,
.secondary-btn:hover,
.ghost-btn:hover,
.copy-btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

.primary-btn:active,
.secondary-btn:active,
.ghost-btn:active,
.copy-btn:active:not(:disabled) {
    transform: translateY(0);
}

.copy-btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
    box-shadow: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.stat-item {
    padding: 16px;
    background: linear-gradient(180deg, rgba(74, 108, 247, 0.10), rgba(74, 108, 247, 0.05));
    border: 1px solid rgba(74, 108, 247, 0.16);
    border-radius: 18px;
}

.stat-label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-secondary-light, #64748b);
    font-size: 0.86rem;
    font-weight: 800;
}

.stat-item strong {
    color: var(--text-light, #2c3e50);
    font-size: clamp(1.55rem, 3vw, 2.2rem);
    line-height: 1;
}

.duplicate-stat {
    background: linear-gradient(180deg, rgba(239, 68, 68, 0.10), rgba(239, 68, 68, 0.05));
    border-color: rgba(239, 68, 68, 0.18);
}

.success-stat {
    background: linear-gradient(180deg, rgba(22, 163, 74, 0.12), rgba(22, 163, 74, 0.05));
    border-color: rgba(22, 163, 74, 0.18);
}

.copy-status {
    min-height: 24px;
    margin-top: 10px;
    color: var(--text-secondary-light, #64748b);
    font-weight: 800;
}

.copy-status.success {
    color: #15803d;
}

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

body.dark-mode .dedupe-hero {
    background:
        linear-gradient(135deg, rgba(74, 108, 247, 0.22), rgba(22, 219, 147, 0.12)),
        var(--card-dark, #1e2538);
    border-color: rgba(148, 163, 184, 0.16);
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.24);
}

body.dark-mode .dedupe-hero h1,
body.dark-mode .card-heading h2,
body.dark-mode .result-toolbar h2,
body.dark-mode .textarea-label,
body.dark-mode .checkbox-item,
body.dark-mode .stat-item strong {
    color: var(--text-dark, #e2e8f0);
}

body.dark-mode .hero-description,
body.dark-mode .card-heading p,
body.dark-mode .result-toolbar p,
body.dark-mode .stat-label,
body.dark-mode .copy-status {
    color: var(--text-secondary-dark, #94a3b8);
}

body.dark-mode .dedupe-card {
    background: rgba(30, 37, 56, 0.92);
    border-color: rgba(148, 163, 184, 0.16);
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.26);
}

body.dark-mode .line-counter {
    color: #c7d2fe;
    background: rgba(110, 137, 248, 0.16);
}

body.dark-mode .hero-badge {
    color: #bbf7d0;
    background: rgba(22, 163, 74, 0.18);
    border-color: rgba(34, 197, 94, 0.24);
}

body.dark-mode .line-deduplicator textarea {
    color: var(--text-dark, #e2e8f0);
    background: #151b2b;
    border-color: rgba(148, 163, 184, 0.20);
}

body.dark-mode .line-deduplicator textarea:focus {
    background: #111827;
    border-color: var(--primary-light, #6e89f8);
    box-shadow: 0 0 0 4px rgba(110, 137, 248, 0.16);
}

body.dark-mode .checkbox-item {
    background: rgba(110, 137, 248, 0.11);
    border-color: rgba(110, 137, 248, 0.18);
}

body.dark-mode .secondary-btn {
    color: #bae6fd;
    background: rgba(14, 165, 233, 0.18);
}

body.dark-mode .ghost-btn {
    color: #fecaca;
    background: rgba(239, 68, 68, 0.18);
}

body.dark-mode .copy-status.success {
    color: #86efac;
}

body.dark-mode .copy-status.error {
    color: #fca5a5;
}

@media (max-width: 1100px) {
    .dedupe-layout {
        grid-template-columns: 1fr;
    }

    .line-deduplicator textarea,
    #result-lines {
        min-height: 300px;
    }
}

@media (max-width: 768px) {
    .line-deduplicator {
        width: min(100% - 24px, 680px);
        padding-top: 76px;
    }

    .dedupe-hero,
    .card-heading,
    .result-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .dedupe-hero,
    .dedupe-card {
        padding: 18px;
        border-radius: 20px;
    }

    .hero-badge,
    .line-counter,
    .copy-btn {
        align-self: flex-start;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .action-row > button {
        flex: 1 1 140px;
    }
}

@media (max-width: 420px) {
    .line-deduplicator {
        width: calc(100% - 16px);
    }

    .option-panel {
        flex-direction: column;
    }

    .checkbox-item {
        width: 100%;
        border-radius: 14px;
    }

    .line-deduplicator textarea,
    #result-lines {
        min-height: 260px;
        font-size: 13px;
    }
}