/* -------------------------------------------------------------
   GLOBAL & RESET STYLES
------------------------------------------------------------- */
:root {
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --border-light: #e2e8f0;

    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;

    --spam-color: #dc2626;
    --spam-bg: #fef2f2;
    --spam-border: #fca5a5;

    --ham-color: #16a34a;
    --ham-bg: #f0fdf4;
    --ham-border: #86efac;

    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --transition-fast: all 0.2s ease-in-out;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    padding: 24px 16px;
    font-size: 15px;
}

.app-container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
}

/* -------------------------------------------------------------
   HEADER
------------------------------------------------------------- */
.app-header {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #ffffff;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    flex-shrink: 0;
}

.header-titles h1 {
    font-size: 26px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.header-titles .subtitle {
    font-size: 15px;
    color: var(--text-secondary);
    margin-top: 2px;
    font-weight: 500;
}

.badges-row {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: var(--radius-full);
}

.badge-info {
    background: var(--primary-light);
    color: var(--primary-color);
    border: 1px solid #bfdbfe;
}

.badge-spam {
    background: var(--spam-bg);
    color: var(--spam-color);
    border: 1px solid var(--spam-border);
}

.badge-ham {
    background: var(--ham-bg);
    color: var(--ham-color);
    border: 1px solid var(--ham-border);
}

.badge-neutral {
    background: #f1f5f9;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* -------------------------------------------------------------
   CARDS & GRID LAYOUT
------------------------------------------------------------- */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    margin-bottom: 18px;
    display: flex;
    flex-direction: column;
}

.card-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-header .sub-text {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* TOP GRID: UPLOAD & MODEL SELECTION */
.top-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

@media (max-width: 992px) {
    .top-grid {
        grid-template-columns: 1fr;
    }
}

/* -------------------------------------------------------------
   UPLOAD SECTION
------------------------------------------------------------- */
.upload-card {
    margin-bottom: 0;
    display: flex;
    flex-direction: column;
}

.drop-zone {
    border: 2px dashed var(--primary-color);
    border-radius: var(--radius-md);
    padding: 36px 20px;
    text-align: center;
    background: #f8fafc;
    cursor: pointer;
    position: relative;
    transition: var(--transition-fast);
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary-hover);
    background: var(--primary-light);
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.drop-icon {
    font-size: 42px;
    color: var(--primary-color);
    margin-bottom: 12px;
}

.drop-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.drop-sub {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* Selected Files List */
.selected-files-container {
    margin-top: 18px;
    border-top: 1px solid var(--border-light);
    padding-top: 14px;
}

.files-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.files-list {
    list-style: none;
    max-height: 180px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-main);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
    font-size: 14px;
}

.file-item-info {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}

.file-name {
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 320px;
}

.file-size {
    font-size: 12px;
    color: var(--text-muted);
}

.remove-file-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition-fast);
}

.remove-file-btn:hover {
    color: var(--spam-color);
    background: var(--spam-bg);
}

/* -------------------------------------------------------------
   MODEL SELECTION CARDS
------------------------------------------------------------- */
.model-card {
    margin-bottom: 0;
}

.model-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.model-option-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    background: var(--card-bg);
    transition: var(--transition-fast);
}

.model-option-card:hover {
    border-color: #93c5fd;
    background: #f8fafc;
}

.model-option-card.active {
    border-color: var(--primary-color);
    background: var(--primary-light);
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.08);
}

.checkbox-wrapper {
    position: relative;
    width: 20px;
    height: 20px;
    margin-top: 2px;
}

.checkbox-wrapper input {
    opacity: 0;
    width: 0;
    height: 0;
}

.custom-checkbox {
    position: absolute;
    top: 0;
    left: 0;
    width: 20px;
    height: 20px;
    background-color: #fff;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    transition: var(--transition-fast);
}

.model-option-card.active .custom-checkbox {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.model-option-card.active .custom-checkbox:after {
    content: "";
    position: absolute;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.model-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.model-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

.individual-models {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-left: 16px;
    padding-left: 14px;
    border-left: 3px solid var(--border-light);
}

/* -------------------------------------------------------------
   BUTTONS
------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 15px;
    font-weight: 700;
    padding: 12px 22px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary {
    background: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:disabled {
    background: #cbd5e1;
    color: #64748b;
    cursor: not-allowed;
    opacity: 0.8;
}

.btn-outline {
    background: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: #f1f5f9;
}

.btn-block {
    width: 100%;
}

.btn-text {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
}

.text-danger {
    color: var(--spam-color);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-icon:hover {
    color: var(--text-primary);
}

/* -------------------------------------------------------------
   EMPTY STATE CARD
------------------------------------------------------------- */
.empty-state-card {
    text-align: center;
    padding: 48px 24px;
    background: #ffffff;
    border: 2px dashed var(--border-color);
}

.empty-icon {
    font-size: 48px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.empty-state-content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.empty-state-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* -------------------------------------------------------------
   SUMMARY METRICS DASHBOARD
------------------------------------------------------------- */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.metric-box {
    padding: 20px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: #f8fafc;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.metric-value {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.1;
}

.metric-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 6px;
}

.box-total .metric-value { color: var(--primary-color); }
.box-spam .metric-value { color: var(--spam-color); }
.box-ham .metric-value { color: var(--ham-color); }
.box-agreement .metric-value { color: #7c3aed; }

.model-breakdown-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    border-top: 1px solid var(--border-light);
    padding-top: 18px;
}

@media (max-width: 640px) {
    .model-breakdown-row {
        grid-template-columns: 1fr;
    }
}

.model-stat-pill {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 13px;
}

.model-stat-title {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.model-stat-counts {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
}

/* -------------------------------------------------------------
   RESULTS TABLE (PROMINENT VIEW)
------------------------------------------------------------- */
.results-display-card {
    border-left: 4px solid var(--primary-color);
}

.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.results-table th, .results-table td {
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.results-table th {
    background: #f1f5f9;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.04em;
}

.results-table tbody tr {
    cursor: pointer;
    transition: var(--transition-fast);
}

.results-table tbody tr:hover {
    background: var(--primary-light);
}

.eml-subject-cell {
    max-width: 320px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

/* -------------------------------------------------------------
   SINGLE EMAIL RESULT CARDS
------------------------------------------------------------- */
.single-cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.model-res-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    background: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow-sm);
}

.model-res-card h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-secondary);
}

.prediction-badge-lg {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 0.06em;
    padding: 8px 28px;
    border-radius: var(--radius-full);
}

.prediction-confidence {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* -------------------------------------------------------------
   EMAIL DETAIL PANEL
------------------------------------------------------------- */
.detail-meta {
    background: var(--bg-main);
    padding: 18px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 22px;
    font-size: 14px;
}

.meta-item {
    display: flex;
    gap: 14px;
}

.meta-label {
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 140px;
}

.meta-val {
    color: var(--text-primary);
    font-weight: 500;
}

.detail-predictions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin-bottom: 24px;
}

/* Collapsible Preprocessed Text */
.collapsible-section {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.collapsible-trigger {
    width: 100%;
    padding: 16px 20px;
    background: #f8fafc;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.collapsible-trigger:hover {
    background: #f1f5f9;
}

.collapsible-content {
    padding: 18px;
    background: #ffffff;
    border-top: 1px solid var(--border-light);
}

.text-explanation {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.preprocessed-code {
    background: #0f172a;
    color: #38bdf8;
    padding: 18px;
    border-radius: var(--radius-sm);
    font-family: 'Consolas', 'Courier New', Courier, monospace;
    font-size: 13px;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 280px;
    overflow-y: auto;
}

/* -------------------------------------------------------------
   THESIS EXPERIMENT INFO CARD
------------------------------------------------------------- */
.experiment-info-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.experiment-info-list strong {
    color: var(--text-primary);
    font-weight: 700;
}