:root {
    --bg-color: #05070a;
    --surface-color: rgba(22, 27, 34, 0.72);
    --surface-border: rgba(48, 54, 61, 0.5);
    --primary-color: #58a6ff;
    --primary-glow: rgba(88, 166, 255, 0.35);
    --accent-color: #7d4cfe;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --success-color: #3fb950;
    --danger-color: #f85149;
    --warning-color: #ff8c42;
    --glass-bg: rgba(22, 27, 34, 0.62);
    --glass-border: rgba(255, 255, 255, 0.1);
    --border-radius-lg: 20px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light-theme {
    --bg-color: #f0f2f5;
    --surface-color: rgba(255, 255, 255, 0.82);
    --surface-border: rgba(208, 215, 222, 0.6);
    --primary-color: #0969da;
    --primary-glow: rgba(9, 105, 218, 0.2);
    --accent-color: #6e41e2;
    --text-primary: #1f2328;
    --text-secondary: #636c76;
    --glass-bg: rgba(255, 255, 255, 0.74);
    --glass-border: rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Inter", system-ui, -apple-system, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    background: radial-gradient(circle at top left, rgba(88, 166, 255, 0.12), transparent 30%),
        radial-gradient(circle at bottom right, rgba(125, 76, 254, 0.12), transparent 35%),
        var(--bg-color);
    color: var(--text-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    position: relative;
}

body::before,
body::after {
    content: "";
    position: fixed;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.14;
    z-index: -1;
    animation: orb-move 18s infinite alternate ease-in-out;
}

body::before {
    top: -120px;
    left: -80px;
    background: var(--primary-color);
}

body::after {
    right: -80px;
    bottom: -120px;
    background: var(--accent-color);
    animation-delay: -9s;
}

@keyframes orb-move {
    0% {
        transform: translate(0, 0) scale(1);
    }
    100% {
        transform: translate(80px, 100px) scale(1.18);
    }
}

.hidden {
    display: none !important;
}

.app-container {
    width: 100%;
    max-width: 940px;
    padding: 3rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo i {
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px var(--primary-glow));
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.highlight {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.theme-toggle {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    cursor: pointer;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.about-toggle {
    height: 46px;
    padding: 0 1rem;
    border-radius: 999px;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 700;
    backdrop-filter: blur(10px);
    transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.about-toggle:hover {
    transform: translateY(-1px);
    border-color: rgba(88, 166, 255, 0.32);
}

.about-toggle.is-open {
    background: rgba(88, 166, 255, 0.12);
    color: var(--primary-color);
    border-color: rgba(88, 166, 255, 0.24);
}

.theme-toggle:hover {
    transform: rotate(15deg) scale(1.05);
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-section {
    text-align: center;
    padding: 0.5rem 0 0.75rem;
}

.hero-section h2 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-section p {
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1.08rem;
    line-height: 1.65;
}

.services-section {
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
    padding: 1.4rem 1.5rem 0.4rem;
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    background:
        linear-gradient(180deg, rgba(88, 166, 255, 0.05), transparent 48%),
        linear-gradient(135deg, rgba(125, 76, 254, 0.08), rgba(255, 255, 255, 0.02));
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.14);
}

.about-modal {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.about-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(3, 6, 12, 0.62);
    backdrop-filter: blur(10px);
}

.about-modal-panel {
    position: relative;
    width: min(1120px, 100%);
    max-height: calc(100vh - 3rem);
    overflow-y: auto;
    padding-bottom: 1.2rem;
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.3);
}

body.light-theme .about-modal-backdrop {
    background: rgba(15, 23, 42, 0.18);
}

body.light-theme .about-modal-panel {
    background:
        linear-gradient(180deg, rgba(9, 105, 218, 0.08), rgba(255, 255, 255, 0.92) 42%),
        rgba(255, 255, 255, 0.96);
    border-color: rgba(9, 105, 218, 0.12);
    box-shadow: 0 24px 64px rgba(15, 23, 42, 0.18);
}

body.light-theme .about-modal-panel .services-head h3,
body.light-theme .about-modal-panel .service-copy h4 {
    color: #162033;
}

body.light-theme .about-modal-panel .services-head p,
body.light-theme .about-modal-panel .service-copy p {
    color: #4d5b6f;
}

body.light-theme .about-modal-panel .service-card {
    background: rgba(255, 255, 255, 0.88);
    border-color: rgba(148, 163, 184, 0.24);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

body.light-theme .about-modal-panel .service-card-primary {
    background:
        linear-gradient(180deg, rgba(9, 105, 218, 0.1), rgba(255, 255, 255, 0.92)),
        rgba(255, 255, 255, 0.92);
    border-color: rgba(9, 105, 218, 0.22);
}

body.light-theme .about-modal-panel .service-tags span {
    background: rgba(241, 245, 249, 0.95);
    border-color: rgba(148, 163, 184, 0.26);
    color: #4d5b6f;
}

.services-head h3 {
    font-size: 1.3rem;
    margin-top: 0.4rem;
    margin-bottom: 0.5rem;
}

.services-head p {
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 720px;
}

.section-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.38rem 0.7rem;
    border-radius: 999px;
    background: rgba(88, 166, 255, 0.12);
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.service-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 220px;
    padding: 1.2rem;
    border-radius: var(--border-radius-lg);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--glass-border);
}

.service-card-primary {
    background:
        linear-gradient(180deg, rgba(88, 166, 255, 0.12), rgba(255, 255, 255, 0.03)),
        rgba(255, 255, 255, 0.04);
    border-color: rgba(88, 166, 255, 0.22);
}

.service-icon {
    width: 56px;
    height: 56px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.18), rgba(125, 76, 254, 0.18));
    color: var(--primary-color);
    font-size: 1.5rem;
}

.service-copy h4 {
    font-size: 1.08rem;
    margin-bottom: 0.55rem;
}

.service-copy p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.service-tags span {
    padding: 0.42rem 0.65rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
}

.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.18);
    overflow: hidden;
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.16);
}

.card-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--glass-border);
}

.card-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.2rem;
    font-weight: 700;
}

.card-body {
    padding: 2rem;
}

.upload-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.upload-zone-wrapper {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.zone-label {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.required {
    color: var(--danger-color);
}

.drop-zone {
    min-height: 190px;
    border: 2px dashed var(--glass-border);
    border-radius: var(--border-radius-lg);
    background: rgba(255, 255, 255, 0.02);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), transform var(--transition-fast), background var(--transition-fast);
}

.report-zone {
    border-style: dotted;
}

.drop-zone:hover {
    border-color: var(--primary-color);
    background: rgba(88, 166, 255, 0.05);
}

.drop-zone.dragover {
    border-color: var(--accent-color);
    background: rgba(125, 76, 254, 0.09);
    transform: scale(1.015);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.55rem;
}

.cloud-icon {
    font-size: 2.7rem;
    margin-bottom: 0.2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: float 3s ease-in-out infinite;
}

.drop-zone-title {
    font-size: 1rem;
    font-weight: 700;
}

.drop-zone-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

@keyframes float {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

.file-info {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 1rem 1.1rem;
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.04);
}

.file-icon {
    font-size: 1.7rem;
    color: var(--primary-color);
}

.file-name {
    flex: 1;
    font-size: 0.96rem;
    font-weight: 600;
    word-break: break-word;
}

.btn-remove {
    width: 38px;
    height: 38px;
    border: none;
    border-radius: 50%;
    background: rgba(248, 81, 73, 0.12);
    color: var(--danger-color);
    cursor: pointer;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.btn-remove:hover {
    background: rgba(248, 81, 73, 0.2);
    transform: scale(1.05);
}

.status-container {
    margin-top: 1.5rem;
    padding: 1rem 1.2rem;
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
}

.progress-bar {
    width: 100%;
    height: 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    overflow: hidden;
}

.progress-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 0 16px var(--primary-glow);
    transition: width 0.45s ease;
}

.status-text {
    margin-top: 0.8rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.action-buttons,
.analysis-actions,
.result-actions {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex-wrap: wrap;
}

.action-buttons {
    margin-top: 1.5rem;
}

.btn {
    border: none;
    border-radius: var(--border-radius-md);
    padding: 1rem 1.4rem;
    font-size: 1rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.7rem;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 10px 22px rgba(88, 166, 255, 0.28);
}

.btn-secondary {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--glass-border);
}

.btn-success {
    color: #fff;
    background: linear-gradient(135deg, #34d399, #10b981);
    box-shadow: 0 10px 22px rgba(52, 211, 153, 0.2);
}

.btn-block {
    width: 100%;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    filter: brightness(1.04);
}

.analysis-panel {
    margin-top: 1.75rem;
    padding-top: 1.75rem;
    border-top: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.analysis-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
}

.analysis-header h4 {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 1.1rem;
    margin-bottom: 0.45rem;
}

.analysis-header p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.analysis-badge {
    padding: 0.55rem 0.85rem;
    border-radius: 999px;
    background: rgba(88, 166, 255, 0.12);
    color: var(--primary-color);
    font-size: 0.82rem;
    font-weight: 700;
    white-space: nowrap;
}

.analysis-summary,
.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.stat-box {
    padding: 1rem 1.1rem;
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.stat-box:hover {
    transform: translateY(-2px);
    border-color: rgba(88, 166, 255, 0.28);
    background: rgba(255, 255, 255, 0.05);
}

.stat-box.compact {
    min-height: 88px;
}

.stat-box.highlight-stat {
    background: rgba(125, 76, 254, 0.08);
    border-color: rgba(125, 76, 254, 0.3);
    box-shadow: 0 0 20px rgba(125, 76, 254, 0.1);
}

.stat-box.highlight-stat:hover {
    background: rgba(125, 76, 254, 0.12);
    border-color: var(--accent-color);
}

.stat-box.highlight-stat strong {
    color: var(--accent-color);
}

.stat-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.82rem;
    margin-bottom: 0.45rem;
}

.stat-box strong,
.stat-info span {
    font-size: 1.5rem;
    font-weight: 800;
}

.stat-info h4 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.45rem;
}

.preview-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preview-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
}

.preview-head h5 {
    font-size: 1rem;
}

.preview-head span {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.preview-list {
    display: grid;
    gap: 0.9rem;
}

.preview-item,
.preview-empty {
    padding: 1rem 1.1rem;
    border-radius: var(--border-radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
}

.preview-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.65rem;
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.preview-index {
    padding: 0.28rem 0.5rem;
    border-radius: 999px;
    background: rgba(255, 140, 66, 0.14);
    color: var(--warning-color);
    font-weight: 700;
}

.preview-text {
    font-size: 0.98rem;
    line-height: 1.6;
}

.preview-evidence {
    margin-top: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.55;
    border-left: 3px solid rgba(255, 140, 66, 0.4);
    padding-left: 0.75rem;
}

.preview-tags {
    margin-top: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.preview-tags span {
    padding: 0.4rem 0.6rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.preview-links {
    margin-top: 0.8rem;
}

.preview-links a {
    color: var(--primary-color);
    font-size: 0.88rem;
    text-decoration: none;
}

.preview-links a:hover {
    text-decoration: underline;
}

.result-actions {
    margin-top: 1.5rem;
}

.app-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding: 0.5rem 0 1rem;
}

.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .analysis-summary,
    .result-stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 720px) {
    .app-container {
        padding: 1.5rem 1rem;
    }

    .app-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 1rem;
    }

    .hero-section h2 {
        font-size: 2.3rem;
    }

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

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

    .card-header,
    .card-body,
    .services-section {
        padding: 1.25rem;
    }

    .analysis-header,
    .preview-head,
    .action-buttons,
    .analysis-actions,
    .result-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .header-actions {
        width: 100%;
        justify-content: space-between;
    }

    .about-modal {
        padding: 1rem;
    }

    .about-modal-panel {
        max-height: calc(100vh - 2rem);
    }
}

@media (max-width: 520px) {
    .hero-section h2 {
        font-size: 1.9rem;
    }

    .analysis-summary,
    .result-stats {
        grid-template-columns: 1fr;
    }

    .btn {
        width: 100%;
    }

    .file-info {
        align-items: flex-start;
    }
}