:root {
    color-scheme: dark;
    --bg: #06121d;
    --bg-deep: #020811;
    --panel: rgba(10, 22, 34, 0.86);
    --panel-solid: #0a1622;
    --panel-soft: rgba(16, 31, 49, 0.78);
    --surface: #11273d;
    --surface-strong: #183754;
    --line: rgba(142, 182, 212, 0.18);
    --line-strong: rgba(142, 182, 212, 0.34);
    --text: #eef8ff;
    --text-soft: #99afc2;
    --text-faint: #6d859b;
    --accent: #67e3cf;
    --accent-strong: #1ab7d1;
    --accent-warm: #ff9c66;
    --shadow: 0 36px 80px rgba(0, 6, 18, 0.45);
    --radius-xl: 30px;
    --radius-lg: 22px;
    --radius-md: 16px;
    --radius-sm: 12px;
}

body.light-mode {
    color-scheme: light;
    --bg: #f6f1e9;
    --bg-deep: #ece2d3;
    --panel: rgba(255, 252, 246, 0.84);
    --panel-solid: #fffbf5;
    --panel-soft: rgba(255, 248, 240, 0.92);
    --surface: #f3ebdf;
    --surface-strong: #ead8c2;
    --line: rgba(96, 85, 71, 0.14);
    --line-strong: rgba(96, 85, 71, 0.24);
    --text: #1f2730;
    --text-soft: #645f5b;
    --text-faint: #8e877c;
    --accent: #117d7c;
    --accent-strong: #0f6aa2;
    --accent-warm: #d9763d;
    --shadow: 0 24px 64px rgba(102, 86, 61, 0.14);
}

body.light-mode .provider-badge.google,
body.light-mode .provider-badge.google-cloud {
    border-color: rgba(17, 125, 124, 0.3);
    color: #0e6d6c;
}

body.light-mode .provider-badge.aws {
    border-color: rgba(217, 118, 61, 0.28);
    color: #b35f20;
}

body.light-mode .provider-badge.cloudflare {
    border-color: rgba(47, 109, 164, 0.28);
    color: #2f6da4;
}

body.light-mode .provider-badge.azure {
    border-color: rgba(53, 111, 157, 0.28);
    color: #356f9d;
}

body.light-mode .error-card {
    border-color: rgba(201, 79, 54, 0.28);
    background: rgba(201, 79, 54, 0.1);
    color: #8d2f1d;
}

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

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    padding: 32px 18px 48px;
    font-family: 'IBM Plex Sans KR', sans-serif;
    color: var(--text);
    line-height: 1.6;
    background:
        radial-gradient(circle at top left, rgba(26, 183, 209, 0.24), transparent 26%),
        radial-gradient(circle at 85% 14%, rgba(255, 156, 102, 0.16), transparent 22%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
    transition: background 0.35s ease, color 0.35s ease;
    overflow-x: hidden;
}

body::before,
body::after {
    content: '';
    position: fixed;
    inset: auto;
    pointer-events: none;
    z-index: 0;
}

body::before {
    top: 8%;
    left: 4%;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(129, 231, 214, 0.1), transparent 72%);
    filter: blur(8px);
}

body::after {
    right: 2%;
    bottom: 8%;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 181, 109, 0.08), transparent 70%);
    filter: blur(12px);
}

.shell {
    position: relative;
    z-index: 1;
    width: min(1180px, 100%);
    margin: 0 auto;
    display: grid;
    gap: 24px;
}

.top-bar,
.tabs,
.tool-panel,
.info-strip {
    animation: fade-up 0.7s ease both;
}

.tabs {
    animation-delay: 0.08s;
}

.tool-panel {
    animation-delay: 0.14s;
}

.info-strip {
    animation-delay: 0.2s;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    color: var(--text);
    text-decoration: none;
}

.brand-mark {
    width: 14px;
    height: 14px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 52%, var(--accent-warm) 100%);
    box-shadow: 0 0 24px rgba(103, 227, 207, 0.45);
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-copy strong {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    text-transform: uppercase;
}

.brand-copy span:last-child {
    font-size: 0.82rem;
    color: var(--text-soft);
}

.theme-toggle-btn {
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
    padding: 12px 18px;
    border-radius: 999px;
    cursor: pointer;
    font: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
    backdrop-filter: blur(18px);
}

.theme-toggle-btn:hover {
    transform: translateY(-1px);
    border-color: var(--line-strong);
    background: rgba(255, 255, 255, 0.05);
}

.tool-panel,
.info-strip {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.section-tag,
.intro-card-tag,
.summary-label,
.card-kicker,
.success-tag,
.info-key {
    font-family: 'IBM Plex Sans KR', sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: none;
    color: var(--accent);
}

.info-strip {
    padding: 16px 18px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    background: var(--panel-soft);
    border-radius: var(--radius-lg);
    box-shadow: none;
}

.info-item,
.side-card {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--panel-soft);
    padding: 20px;
}

.info-item {
    display: grid;
    gap: 8px;
    padding: 16px 18px;
    background: rgba(255, 255, 255, 0.03);
}

.info-value {
    color: var(--text);
    font-size: 0.94rem;
    line-height: 1.5;
}

.side-card p {
    color: var(--text-soft);
    font-size: 0.92rem;
    line-height: 1.65;
}

.tabs {
    display: inline-flex;
    gap: 10px;
    justify-self: start;
    padding: 8px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(16px);
}

.tab-btn {
    border: none;
    padding: 11px 18px;
    border-radius: 999px;
    background: transparent;
    color: var(--text-soft);
    font: inherit;
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.tab-btn:hover {
    color: var(--text);
    transform: translateY(-1px);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 58%, var(--accent-warm) 100%);
    color: #061a20;
    box-shadow: 0 14px 28px rgba(26, 183, 209, 0.24);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tool-panel {
    padding: 28px;
}

.panel-heading {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: end;
    margin-bottom: 24px;
}

.panel-heading h3 {
    margin: 8px 0 8px;
    font-size: clamp(1.45rem, 2vw, 1.95rem);
    letter-spacing: 0;
}

.panel-heading p {
    color: var(--text-soft);
    max-width: 52ch;
    font-size: 0.92rem;
    line-height: 1.58;
}

.panel-note {
    display: inline-flex;
    align-items: center;
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    color: var(--text-soft);
    background: rgba(255, 255, 255, 0.03);
    white-space: nowrap;
    font-size: 0.82rem;
}

.dns-server-selector {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 18px;
}

.dns-option {
    display: grid;
    gap: 3px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.dns-option:hover {
    transform: translateY(-2px);
    border-color: var(--line-strong);
}

.dns-option.active {
    border-color: rgba(26, 183, 209, 0.62);
    background: linear-gradient(180deg, rgba(103, 227, 207, 0.18), rgba(26, 183, 209, 0.1));
}

.dns-option-name {
    font-size: 0.92rem;
    font-weight: 700;
}

.dns-option-meta {
    font-family: 'IBM Plex Sans KR', sans-serif;
    font-size: 0.76rem;
    color: var(--text-soft);
    letter-spacing: 0;
    text-transform: none;
}

.search-box {
    display: flex;
    gap: 12px;
    align-items: center;
    padding: 12px;
    margin-bottom: 16px;
    border-radius: 22px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.03);
}

.search-box:focus-within {
    border-color: rgba(129, 231, 214, 0.48);
    box-shadow: inset 0 0 0 1px rgba(129, 231, 214, 0.22);
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text);
    padding: 8px 10px;
    font: inherit;
    font-size: 0.98rem;
}

.search-box input::placeholder {
    color: var(--text-faint);
}

.search-box button,
#uploadBtn,
.download-link {
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 58%, var(--accent-warm) 100%);
    color: #061c21;
    padding: 14px 22px;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.search-box button:hover,
#uploadBtn:hover,
.download-link:hover {
    transform: translateY(-1px);
    filter: brightness(1.03);
}

.quick-domains {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-bottom: 6px;
}

.quick-label {
    color: var(--text-soft);
    font-size: 0.84rem;
}

.sample-chip {
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
    border-radius: 999px;
    padding: 8px 12px;
    cursor: pointer;
    font: inherit;
    font-size: 0.84rem;
    transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.sample-chip:hover {
    transform: translateY(-1px);
    border-color: var(--line-strong);
    background: rgba(255, 255, 255, 0.05);
}

.loading {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 24px 0 10px;
    color: var(--text-soft);
}

.spinner {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.14);
    border-top-color: var(--accent);
    animation: spin 0.85s linear infinite;
}

.results-container {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 18px;
}

.result-summary {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.summary-card,
.card {
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    background: var(--panel-soft);
}

.summary-card {
    padding: 18px 20px;
}

.summary-card strong {
    display: block;
    margin-top: 8px;
    font-size: 1.4rem;
}

.summary-card-wide {
    display: grid;
    align-content: start;
}

.summary-provider-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.summary-provider,
.provider-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    font-family: 'IBM Plex Sans KR', sans-serif;
    font-size: 0.75rem;
    letter-spacing: 0.01em;
}

.summary-provider {
    padding: 7px 10px;
    border: 1px solid var(--line);
    color: var(--text-soft);
}

.summary-provider.muted {
    opacity: 0.72;
}

.card {
    overflow: hidden;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 12px;
    padding: 18px 20px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.03);
}

.card-header h3 {
    margin-top: 6px;
    font-size: 1.2rem;
    letter-spacing: 0;
}

.card-count {
    min-width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    border: 1px solid var(--line);
    font-family: 'IBM Plex Mono', monospace;
    color: var(--text-soft);
}

.card-body {
    padding: 14px 20px 20px;
}

.card-body ul {
    list-style: none;
}

.card-body li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.card-body li:last-child {
    border-bottom: none;
}

.record-main {
    display: grid;
    gap: 5px;
}

.record-value {
    font-size: 0.96rem;
}

.record-caption,
.no-records {
    color: var(--text-soft);
    font-size: 0.86rem;
}

.mono,
code {
    font-family: 'IBM Plex Mono', monospace;
}

code {
    padding: 0.15em 0.45em;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    font-size: 0.9em;
}

.provider-badge {
    padding: 8px 10px;
    border: 1px solid var(--line);
    color: var(--text-soft);
    text-align: right;
}

.provider-badge.google,
.provider-badge.google-cloud {
    border-color: rgba(129, 231, 214, 0.45);
    color: var(--accent);
}

.provider-badge.aws {
    border-color: rgba(255, 181, 109, 0.46);
    color: var(--accent-warm);
}

.provider-badge.cloudflare {
    border-color: rgba(122, 172, 255, 0.45);
    color: #99c0ff;
}

.provider-badge.azure {
    border-color: rgba(147, 199, 255, 0.4);
    color: #a7d3ff;
}

.provider-badge.muted {
    opacity: 0.74;
}

.pipeline-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.72fr);
    gap: 18px;
}

.upload-box {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--panel-soft);
    padding: 24px;
}

.upload-box h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    letter-spacing: 0;
}

.upload-box p {
    color: var(--text-soft);
    margin-bottom: 24px;
    font-size: 0.94rem;
    line-height: 1.65;
}

.form-group {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
}

.form-group input[type='text'],
.form-group input[type='file'] {
    width: 100%;
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    padding: 14px 16px;
    font: inherit;
    outline: none;
}

.form-group input[type='text']:focus,
.form-group input[type='file']:focus {
    border-color: rgba(129, 231, 214, 0.5);
    box-shadow: inset 0 0 0 1px rgba(129, 231, 214, 0.22);
}

.form-group input[type='file']::file-selector-button {
    margin-right: 14px;
    border: none;
    border-radius: 999px;
    background: var(--surface-strong);
    color: var(--text);
    padding: 9px 14px;
    font: inherit;
    cursor: pointer;
}

#uploadBtn,
.download-link {
    width: 100%;
}

.side-stack {
    display: grid;
    gap: 18px;
}

.side-list {
    list-style: none;
    display: grid;
    gap: 12px;
    margin-top: 14px;
}

.side-list li {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 12px;
    align-items: start;
}

.side-list span {
    width: 28px;
    height: 28px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    border-radius: 999px;
    background: var(--surface-strong);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.78rem;
    color: var(--text);
}

.side-card-accent {
    background: linear-gradient(180deg, rgba(129, 231, 214, 0.16), rgba(255, 181, 109, 0.08));
}

.result-download {
    grid-column: 1 / -1;
}

.pipeline-success {
    display: grid;
    gap: 12px;
}

.pipeline-success p {
    color: var(--text-soft);
}

.error-card {
    grid-column: 1 / -1;
    display: grid;
    gap: 8px;
    padding: 20px 22px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 126, 110, 0.42);
    background: rgba(113, 31, 25, 0.2);
    color: #ffb5ab;
}

.error-card strong {
    font-size: 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes fade-up {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 1080px) {
    .pipeline-layout {
        grid-template-columns: 1fr;
    }

    .dns-server-selector {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .results-container,
    .result-summary {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 720px) {
    body {
        padding: 18px 12px 28px;
    }

    .top-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .theme-toggle-btn {
        width: 100%;
    }

    .tool-panel,
    .info-strip {
        padding: 22px 18px;
        border-radius: 24px;
    }

    .dns-server-selector,
    .results-container,
    .result-summary,
    .info-strip {
        grid-template-columns: 1fr;
    }

    .tabs {
        width: 100%;
        justify-self: stretch;
    }

    .tab-btn {
        flex: 1;
    }

    .panel-heading {
        flex-direction: column;
        align-items: start;
    }

    .search-box {
        flex-direction: column;
        align-items: stretch;
    }

    .card-body li {
        flex-direction: column;
        align-items: start;
    }

    .provider-badge {
        text-align: left;
    }
}