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ease}.header__login-btn:hover{background:#fff3}.header__user{display:flex;align-items:center;gap:var(--space-sm)}.header__user-icon{font-size:14px}.header__username{font-size:13px;font-weight:500;color:#ffffffe6}.header__logout-btn{padding:4px 12px;background:transparent;border:none;color:#ffffffb3;font-size:12px;cursor:pointer;transition:color .15s ease}.header__logout-btn:hover{color:#f87171}.dataset-history{display:flex;flex-direction:column;padding:var(--space-md) 0}.dataset-history__header{display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-lg);margin-bottom:var(--space-sm)}.dataset-history__title{font-size:var(--font-size-caption);font-weight:var(--font-weight-medium);color:var(--color-slate-gray);text-transform:uppercase;letter-spacing:.5px;margin:0}.dataset-history__clear{background:transparent;border:none;font-family:var(--font-primary);font-size:var(--font-size-meta);color:var(--color-slate-gray);cursor:pointer;padding:2px 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var(--layout-header-height));background-color:var(--color-pure-white);border-right:1px solid var(--color-border);overflow-y:auto}.sidebar__nav{padding:var(--space-md) 0}.sidebar__nav-list{list-style:none;margin:0;padding:0}.sidebar__nav-item{display:flex;align-items:center;gap:var(--space-sm);width:100%;padding:var(--space-sm) var(--space-lg);background:transparent;border:none;font-family:var(--font-primary);font-size:var(--font-size-body);font-weight:var(--font-weight-regular);color:var(--color-slate-gray);text-align:left;cursor:pointer;transition:background-color var(--transition-fast),color var(--transition-fast)}.sidebar__nav-item:hover{background-color:var(--color-off-white);color:var(--color-deep-indigo)}.sidebar__nav-item--active{background-color:var(--color-off-white);color:var(--color-academic-blue);font-weight:var(--font-weight-medium);border-left:3px solid var(--color-academic-blue);padding-left:calc(var(--space-lg) - 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.csv-upload__icon{transform:scale(1.05)}.csv-upload__text{font-size:var(--font-size-h3);font-weight:var(--font-weight-medium);color:var(--color-deep-indigo);margin-bottom:var(--space-xs);text-align:center}.csv-upload__subtext{color:var(--color-slate-gray);text-align:center}.csv-upload__browse-link{color:var(--color-academic-blue);font-weight:var(--font-weight-medium);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px}.csv-upload__formats{margin-top:var(--space-lg);text-align:center;color:var(--color-slate-gray);padding:var(--space-sm) var(--space-md);background-color:#00000005;border-radius:4px}.csv-upload__loading{display:flex;flex-direction:column;align-items:center;gap:var(--space-sm);width:100%;max-width:280px}.csv-upload__spinner{width:32px;height:32px;border:3px solid var(--color-border);border-top-color:var(--color-academic-blue);border-radius:50%;animation:spin 1s linear infinite}@keyframes 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var(--space-sm);font-size:var(--font-size-caption);font-weight:var(--font-weight-medium);color:var(--color-error);background:transparent;border:1px solid var(--color-error);border-radius:4px;cursor:pointer;transition:background-color var(--transition-fast)}.csv-upload__retry-btn:hover{background-color:#dc26261a}.csv-summary-card{background-color:var(--color-pure-white);border-radius:var(--card-radius);padding:var(--card-padding);box-shadow:var(--card-shadow)}.csv-summary-card__header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-md);margin-bottom:var(--space-md);padding-bottom:var(--space-md);border-bottom:1px solid var(--color-gridline)}.csv-summary-card__file-info{display:flex;align-items:center;gap:var(--space-sm)}.csv-summary-card__icon{font-size:24px}.csv-summary-card__file-details{display:flex;flex-direction:column}.csv-summary-card__filename{font-size:var(--font-size-body);font-weight:var(--font-weight-medium);color:var(--color-deep-indigo);word-break:break-all}.csv-summary-card__filesize{color:var(--color-slate-gray)}.csv-summary-card__dataset-id{margin-bottom:var(--space-md);padding:var(--space-xs) var(--space-sm);background-color:var(--color-off-white);border-radius:4px;font-family:monospace}.csv-summary-card__dataset-id .caption{color:var(--color-slate-gray)}.csv-summary-card__warning{display:flex;align-items:center;gap:var(--space-xs);margin-bottom:var(--space-md);padding:var(--space-xs) 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var(--space-sm);font-size:var(--font-size-caption);font-weight:var(--font-weight-medium);border-radius:4px;white-space:nowrap}.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-lg);width:100%}@media (max-width: 1024px){.kpi-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width: 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infinite;border-radius:4px}.skeleton--icon{width:40px;height:40px;border-radius:8px;flex-shrink:0}.skeleton--value{width:80px;height:24px;margin-bottom:4px}.skeleton--label{width:100px;height:16px}.kpi-card--skeleton{display:flex;align-items:center;gap:var(--space-md);background-color:var(--color-pure-white);border-radius:var(--card-radius);padding:var(--card-padding);box-shadow:var(--card-shadow)}.table-skeleton{display:flex;flex-direction:column;gap:var(--space-xs);background-color:var(--color-pure-white);border-radius:var(--card-radius);padding:var(--space-md);box-shadow:var(--card-shadow)}.skeleton--row{height:40px;width:100%}.skeleton--header{background:linear-gradient(90deg,#e8e8e8 25%,#d8d8d8,#e8e8e8 75%);background-size:200% 100%}.summary-screen__error{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);background-color:#fef3c7;border-radius:var(--button-radius);color:#92400e;font-size:var(--font-size-caption);margin-bottom:var(--space-md)}.summary-screen__retry-btn{margin-left:auto;padding:var(--space-xs) var(--space-sm);font-size:var(--font-size-caption);font-weight:var(--font-weight-medium);color:#92400e;background:transparent;border:1px solid #92400E;border-radius:4px;cursor:pointer;transition:background-color var(--transition-fast)}.summary-screen__retry-btn:hover{background-color:#92400e1a}.data-preview-table-wrapper{background-color:var(--color-pure-white);border-radius:var(--card-radius);box-shadow:var(--card-shadow);overflow:hidden}.data-preview-table{width:100%;border-collapse:collapse;font-size:var(--font-size-table)}.data-preview-table th{background-color:var(--color-table-header);padding:var(--space-sm) var(--space-md);text-align:left;font-weight:var(--font-weight-medium);color:var(--color-deep-indigo);white-space:nowrap}.data-preview-table 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var(--transition-fast)}.btn--primary:hover{background-color:#2563eb}.btn--primary:active{background-color:#1d4ed8}.btn--secondary{background-color:transparent;border:1px solid var(--color-academic-blue);color:var(--color-academic-blue)}.btn--secondary:hover{background-color:#2f80ed0d}.btn:disabled{opacity:.6;cursor:not-allowed}.btn--primary:disabled:hover{background-color:var(--color-academic-blue)}.chart-card{background-color:var(--color-pure-white);border-radius:var(--card-radius);padding:var(--card-padding);box-shadow:var(--card-shadow);display:flex;flex-direction:column;gap:var(--space-md);min-height:320px}.chart-title{font-size:var(--font-size-h2);font-weight:var(--font-weight-medium);color:var(--color-deep-indigo);margin:0;line-height:1.3}.chart-container{flex:1;position:relative;min-height:260px}.chart-container canvas{width:100%!important;height:100%!important}.charts-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-lg)}@media (max-width: 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0}.chart-skeleton__axis-x{position:absolute;bottom:var(--space-lg);left:var(--space-lg);right:var(--space-lg);height:2px;background:linear-gradient(90deg,#e8e8e8 25%,#d8d8d8,#e8e8e8 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}.chart-skeleton__axis-y{position:absolute;bottom:var(--space-lg);left:var(--space-lg);top:var(--space-md);width:2px;background:linear-gradient(180deg,#e8e8e8 25%,#d8d8d8,#e8e8e8 75%);background-size:100% 200%;animation:shimmer-vertical 1.5s infinite}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes shimmer-vertical{0%{background-position:0 -200%}to{background-position:0 200%}}.chart-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:260px;gap:var(--space-sm);color:var(--color-slate-gray)}.chart-empty-icon{font-size:32px;opacity:.5}.chart-empty-text{font-size:var(--font-size-body)}.analysis-charts__error{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-xxl);background-color:var(--color-pure-white);border-radius:var(--card-radius);box-shadow:var(--card-shadow);text-align:center;gap:var(--space-md)}.analysis-charts__error-icon{font-size:48px;color:var(--color-warning)}.analysis-charts__error-text{font-size:var(--font-size-body);color:var(--color-deep-indigo);margin:0;max-width:400px}.analysis-charts__empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-xxl);background-color:var(--color-pure-white);border-radius:var(--card-radius);box-shadow:var(--card-shadow);text-align:center}.analysis-charts__empty-icon{font-size:48px;margin-bottom:var(--space-md);opacity:.5}.analysis-charts__empty-text{font-size:var(--font-size-h3);font-weight:var(--font-weight-medium);color:var(--color-deep-indigo);margin:0 0 var(--space-xs) 0}.analysis-charts__empty-hint{color:var(--color-slate-gray);margin:0}.chart-actions{display:flex;gap:var(--space-sm);justify-content:flex-end;margin-top:var(--space-sm)}.chart-action-btn{background:transparent;border:none;color:var(--color-slate-gray);cursor:pointer;padding:var(--space-xs) var(--space-sm);border-radius:4px;font-size:var(--font-size-caption);transition:all var(--transition-fast)}.chart-action-btn:hover{background-color:var(--color-off-white);color:var(--color-academic-blue)}.analysis-charts .btn{display:inline-flex;align-items:center;justify-content:center;height:var(--button-height, 40px);padding:0 var(--space-md, 16px);font-family:var(--font-primary, "Inter", sans-serif);font-size:var(--button-font-size, 14px);font-weight:var(--font-weight-medium, 500);border-radius:var(--button-radius, 6px);cursor:pointer;transition:background-color .15s,border-color .15s}.analysis-charts .btn--secondary{background-color:transparent;border:1px solid var(--color-academic-blue, #2F80ED);color:var(--color-academic-blue, #2F80ED)}.analysis-charts .btn--secondary:hover{background-color:#2f80ed0d}:root{--color-deep-indigo: #1E2A38;--color-academic-blue: #2F80ED;--color-slate-gray: #6B7280;--color-off-white: #F8FAFC;--color-pure-white: #FFFFFF;--color-flowrate: #14B8A6;--color-temperature: #F59E0B;--color-pressure: #EF4444;--color-equipment: #8B5CF6;--color-success: #22C55E;--color-warning: #F59E0B;--color-error: #DC2626;--color-info: #3B82F6;--color-border: #CBD5E1;--color-border-hover: #2F80ED;--color-table-header: #F1F5F9;--color-table-zebra: #FAFAFA;--color-gridline: #E5E7EB;--color-tooltip-bg: rgba(30, 42, 56, .9);--font-primary: "Inter", "Roboto", "Arial", sans-serif;--font-fallback: "Roboto", "Arial", sans-serif;--font-size-h1: 28px;--font-size-h2: 20px;--font-size-h3: 18px;--font-size-body: 15px;--font-size-table: 14px;--font-size-caption: 13px;--font-size-meta: 12px;--font-weight-regular: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--line-height-h1: 32px;--line-height-h2: 26px;--line-height-h3: 24px;--line-height-body: 22px;--line-height-table: 20px;--line-height-caption: 18px;--line-height-meta: 16px;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 40px;--space-xxl: 48px;--layout-max-width: 1200px;--layout-columns: 12;--layout-gutter: 24px;--layout-sidebar-width: 240px;--layout-min-content-width: 960px;--layout-header-height: 56px;--button-height: 40px;--button-radius: 6px;--button-font-size: 14px;--card-radius: 8px;--card-padding: 16px;--card-shadow: 0px 2px 6px rgba(0, 0, 0, .05);--table-row-height: 44px;--upload-border-width: 2px;--upload-radius: 8px;--transition-fast: .15s ease;--transition-normal: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-primary);font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-body);color:var(--color-deep-indigo);background-color:var(--color-off-white)}h1{font-size:var(--font-size-h1);font-weight:var(--font-weight-semibold);line-height:var(--line-height-h1);color:var(--color-deep-indigo);margin:0}h2{font-size:var(--font-size-h2);font-weight:var(--font-weight-medium);line-height:var(--line-height-h2);color:var(--color-deep-indigo);margin:0}h3{font-size:var(--font-size-h3);font-weight:var(--font-weight-medium);line-height:var(--line-height-h3);color:var(--color-deep-indigo);margin:0}p{font-size:var(--font-size-body);font-weight:var(--font-weight-regular);line-height:var(--line-height-body);color:var(--color-deep-indigo);margin:0}.caption{font-size:var(--font-size-caption);font-weight:var(--font-weight-regular);line-height:var(--line-height-caption);color:var(--color-slate-gray)}.meta{font-size:var(--font-size-meta);font-weight:var(--font-weight-regular);line-height:var(--line-height-meta);color:var(--color-slate-gray)}.text-secondary{color:var(--color-slate-gray)}a{color:var(--color-academic-blue);text-decoration:none}a:hover{text-decoration:underline}button{font-family:var(--font-primary);font-size:var(--button-font-size);font-weight:var(--font-weight-medium);cursor:pointer;border:none;outline:none}button:focus-visible{outline:2px solid var(--color-academic-blue);outline-offset:2px}.btn{display:inline-flex;align-items:center;justify-content:center;height:var(--button-height);padding:0 var(--space-lg);font-family:var(--font-primary);font-size:var(--button-font-size);font-weight:var(--font-weight-medium);border-radius:var(--button-radius);cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn--sm{height:32px;padding:0 var(--space-md);font-size:var(--font-size-caption)}.btn--primary{background-color:var(--color-academic-blue);border:none;color:var(--color-pure-white)}.btn--primary:hover{background-color:#2563eb;transform:translateY(-1px);box-shadow:0 4px 12px #2f80ed4d}.btn--primary:active{background-color:#1d4ed8;transform:translateY(0)}.btn--secondary{background-color:transparent;border:1px solid var(--color-border);color:var(--color-deep-indigo)}.btn--secondary:hover{border-color:var(--color-academic-blue);color:var(--color-academic-blue);background-color:#2f80ed0d}.btn--secondary:active{background-color:#2f80ed1a}.btn:focus-visible{outline:2px solid var(--color-academic-blue);outline-offset:2px}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.app{display:flex;flex-direction:column;min-height:100vh;min-width:var(--layout-min-content-width)}.app__body{display:flex;flex:1}.history-screen{padding:var(--space-lg)}.history-screen--empty{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;text-align:center}.history-screen__empty-icon{font-size:64px;margin-bottom:var(--space-md);opacity:.3}.history-screen__empty-title{font-size:var(--font-size-h2);font-weight:var(--font-weight-medium);color:var(--color-deep-indigo);margin-bottom:var(--space-sm)}.history-screen__empty-text{font-size:var(--font-size-body);color:var(--color-slate-gray)}.history-screen__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-lg)}.history-screen__count{font-size:var(--font-size-body);color:var(--color-slate-gray)}.history-screen__list{display:flex;flex-direction:column;gap:var(--space-sm)}.history-screen__item{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md);background-color:var(--color-pure-white);border:1px solid var(--color-border);border-radius:var(--card-radius);transition:box-shadow var(--transition-fast)}.history-screen__item:hover{box-shadow:var(--shadow-md)}.history-screen__item-info{display:flex;align-items:center;gap:var(--space-md)}.history-screen__item-icon{font-size:24px}.history-screen__item-details{display:flex;flex-direction:column}.history-screen__item-name{font-size:var(--font-size-body);font-weight:var(--font-weight-medium);color:var(--color-deep-indigo)}.history-screen__item-meta{font-size:var(--font-size-caption);color:var(--color-slate-gray)}