@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
    --bg-primary: #0a0e14;
    --bg-secondary: #0d1117;
    --bg-tertiary: #161b22;
    --bg-elevated: #1c2128;
    --accent-primary: #00d4ff;
    --accent-secondary: #0891b2;
    --accent-glow: rgba(0, 212, 255, 0.15);
    --accent-border: rgba(0, 212, 255, 0.3);
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border-primary: rgba(48, 54, 61, 0.86);
    --success: #3fb950;
    --warning: #d29922;
    --error: #f85149;
    --grid-line: rgba(48, 54, 61, 0.38);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: var(--bg-primary);
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text-primary);
    font-family: 'Archivo', system-ui, sans-serif;
    background:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
        var(--bg-primary);
    background-size: 40px 40px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button,
a {
    font: inherit;
}

button:focus-visible,
a:focus-visible,
.upload-box:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 3px;
}

.shell {
    width: min(1240px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0;
}

.topbar {
    display: grid;
    grid-template-columns: 160px 1fr 160px;
    align-items: center;
    gap: 18px;
    min-height: 76px;
}

.back-link,
.status-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 14px;
    border: 1px solid var(--border-primary);
    background: rgba(13, 17, 23, 0.78);
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    text-decoration: none;
    transition: border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.back-link:hover {
    border-color: var(--accent-border);
    color: var(--accent-primary);
    transform: translateY(-1px);
}

.status-pill {
    gap: 8px;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    box-shadow: 0 0 12px rgba(63, 185, 80, 0.75);
}

.brand {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border: 1px solid var(--accent-border);
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    color: var(--bg-primary);
    font-weight: 800;
    box-shadow: 0 0 22px var(--accent-glow);
}

.eyebrow {
    margin: 0 0 8px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    line-height: 1;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: clamp(22px, 3vw, 34px);
    line-height: 1;
    letter-spacing: 0;
}

.workspace {
    display: grid;
    grid-template-columns: minmax(240px, 0.78fr) minmax(360px, 1.22fr) minmax(220px, 0.72fr);
    gap: 18px;
    margin-top: 26px;
    align-items: stretch;
}

.intro-panel,
.conversion-panel,
.side-panel {
    position: relative;
    border: 1px solid var(--border-primary);
    background: rgba(13, 17, 23, 0.9);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.22);
}

.intro-panel,
.side-panel {
    padding: 24px;
}

.intro-panel::before,
.conversion-panel::before,
.side-panel::before {
    content: '';
    position: absolute;
    inset: -1px auto auto -1px;
    width: 18px;
    height: 18px;
    border-top: 2px solid var(--accent-border);
    border-left: 2px solid var(--accent-border);
}

.intro-panel h2 {
    max-width: 12ch;
    margin-bottom: 22px;
    font-size: clamp(30px, 4.2vw, 56px);
    line-height: 0.95;
    letter-spacing: 0;
    text-wrap: balance;
}

.intro-copy {
    max-width: 34rem;
    color: var(--text-secondary);
    line-height: 1.65;
}

.process-list {
    display: grid;
    gap: 10px;
    margin: 36px 0 0;
}

.process-list div {
    display: grid;
    grid-template-columns: 48px 1fr;
    align-items: center;
    min-height: 46px;
    border-top: 1px solid var(--border-primary);
}

.process-list dt {
    color: var(--accent-primary);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
}

.process-list dd {
    margin: 0;
    color: var(--text-secondary);
}

.conversion-panel {
    padding: 18px;
}

.upload-box {
    display: grid;
    place-items: center;
    min-height: 446px;
    padding: 42px;
    border: 1px dashed var(--accent-border);
    background:
        linear-gradient(135deg, rgba(0, 212, 255, 0.08), transparent 42%),
        var(--bg-secondary);
    cursor: pointer;
    text-align: center;
    transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.upload-box:hover,
.upload-box.is-dragging {
    border-color: var(--accent-primary);
    background-color: var(--bg-tertiary);
    transform: translateY(-1px);
}

.upload-icon {
    display: grid;
    place-items: center;
    width: 76px;
    height: 76px;
    margin-bottom: 22px;
    border: 1px solid var(--accent-border);
    background: var(--accent-glow);
    color: var(--accent-primary);
}

.upload-icon svg {
    width: 40px;
    height: 40px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.8;
}

.upload-box h2 {
    margin-bottom: 10px;
    font-size: clamp(24px, 4vw, 40px);
    line-height: 1.02;
    letter-spacing: 0;
}

.upload-box p {
    margin-bottom: 24px;
    color: var(--text-secondary);
}

.file-info,
.progress-section,
.result-section,
.error-section {
    min-height: 446px;
    padding: 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
}

.file-info {
    display: grid;
    align-content: center;
    gap: 24px;
}

.file-name {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 16px;
    border: 1px solid var(--border-primary);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    overflow-wrap: anywhere;
}

.btn-close {
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    width: 32px;
    height: 32px;
    border: 1px solid rgba(248, 81, 73, 0.44);
    background: rgba(248, 81, 73, 0.1);
    color: var(--error);
    cursor: pointer;
    transition: background 180ms ease, transform 180ms ease;
}

.btn-close:hover {
    background: rgba(248, 81, 73, 0.18);
    transform: rotate(90deg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 18px;
    border: 1px solid transparent;
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
    transition: border-color 180ms ease, background 180ms ease, color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    cursor: wait;
    opacity: 0.55;
}

.btn-primary,
.btn-success {
    background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
    border-color: var(--accent-primary);
    color: var(--bg-primary);
    box-shadow: 0 0 24px var(--accent-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    border-color: var(--border-primary);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    border-color: var(--accent-border);
    color: var(--accent-primary);
}

.btn-download {
    background: var(--bg-tertiary);
    border-color: var(--accent-border);
    color: var(--accent-primary);
}

.progress-section {
    display: grid;
    align-content: center;
    text-align: center;
}

.progress-bar {
    height: 10px;
    overflow: hidden;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
}

.progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--accent-secondary), var(--accent-primary));
    box-shadow: 0 0 24px var(--accent-glow);
    transition: width 300ms ease;
}

#progressText {
    margin-top: 16px;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.result-section,
.error-section {
    animation: fadeIn 260ms ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 22px;
}

.result-header h2 {
    margin-bottom: 0;
    font-size: 24px;
}

.status-badge {
    padding: 8px 12px;
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 700;
}

.status-badge.ok {
    border-color: rgba(63, 185, 80, 0.45);
    color: var(--success);
    background: rgba(63, 185, 80, 0.1);
}

.status-badge.warn {
    border-color: rgba(210, 153, 34, 0.45);
    color: var(--warning);
    background: rgba(210, 153, 34, 0.1);
}

.status-badge.error {
    border-color: rgba(248, 81, 73, 0.45);
    color: var(--error);
    background: rgba(248, 81, 73, 0.1);
}

.stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 22px;
}

.stat-item {
    padding: 14px;
    border: 1px solid var(--border-primary);
    background: var(--bg-tertiary);
}

.stat-label,
.format-box span {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 12px;
}

.stat-value,
.format-box strong {
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 18px;
    font-variant-numeric: tabular-nums;
}

.checks {
    display: grid;
    gap: 10px;
    margin-bottom: 22px;
}

.checks-title {
    margin: 0 0 6px;
    color: var(--text-secondary);
    font-size: 14px;
}

.check-item {
    display: grid;
    grid-template-columns: 54px 1fr;
    gap: 12px;
    align-items: start;
    padding: 14px;
    border-left: 3px solid var(--text-muted);
    background: var(--bg-tertiary);
}

.check-item.ok {
    border-left-color: var(--success);
}

.check-item.warn {
    border-left-color: var(--warning);
}

.check-item.error {
    border-left-color: var(--error);
}

.check-code {
    color: var(--accent-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 700;
}

.check-name {
    margin-bottom: 4px;
    font-weight: 700;
}

.check-message {
    color: var(--text-secondary);
    line-height: 1.45;
}

.download-buttons {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-bottom: 14px;
}

.error-box {
    display: grid;
    align-content: center;
    min-height: 384px;
    padding: 28px;
    border: 1px solid rgba(248, 81, 73, 0.45);
    background: rgba(248, 81, 73, 0.08);
    text-align: center;
}

.error-box h3 {
    color: var(--error);
}

.error-box p {
    color: var(--text-secondary);
}

.side-panel {
    display: grid;
    gap: 14px;
    align-content: start;
}

.rule-list {
    display: grid;
    gap: 12px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.rule-list li {
    padding-left: 14px;
    border-left: 2px solid var(--accent-border);
    color: var(--text-secondary);
    line-height: 1.45;
}

.format-box {
    padding: 16px;
    border: 1px solid var(--border-primary);
    background: var(--bg-tertiary);
}

.footer {
    display: flex;
    justify-content: flex-end;
    padding-top: 18px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
}

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

    .conversion-panel {
        grid-column: span 2;
        order: 3;
    }
}

@media (max-width: 720px) {
    .shell {
        width: min(100% - 20px, 1240px);
        padding-top: 16px;
    }

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

    .brand {
        justify-content: flex-start;
    }

    .status-pill,
    .back-link {
        justify-content: flex-start;
        width: 100%;
    }

    .conversion-panel {
        grid-column: auto;
    }

    .intro-panel h2 {
        max-width: none;
    }

    .upload-box,
    .file-info,
    .progress-section,
    .result-section,
    .error-section {
        min-height: 360px;
        padding: 22px;
    }

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

    .result-header {
        align-items: flex-start;
        flex-direction: column;
    }
}