/* ============================================
   Sales Forecast - Dark Theme
   Matches DAT Workspace design language
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-card: #222636;
    --bg-input: #2a2e3f;
    --border: #2e3348;
    --text-primary: #f5f6fa;
    --text-secondary: #cdd1e0;
    --text-muted: #a0a4b8;
    --accent: #6c8cff;
    --accent-hover: #8ba4ff;
    --green: #4ade80;
    --yellow: #facc15;
    --red: #f87171;
    --orange: #fb923c;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);

    --header-height: 52px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

/* ---------- Header ---------- */
.header {
    background: rgba(15, 17, 23, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(108, 140, 255, 0.1);
    padding: 0 20px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header__back {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
}

.header__back:hover {
    background: rgba(108, 140, 255, 0.15);
    color: var(--text-primary);
}

.header__back svg {
    width: 20px;
    height: 20px;
}

.header__title {
    font-size: 1.1rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent) 0%, hsla(270, 50%, 65%, 1) 50%, hsla(40, 80%, 60%, 1) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.header__nav {
    margin-left: auto;
    display: flex;
    gap: 4px;
}

.header__nav-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
}

.header__nav-btn:hover {
    color: var(--text-primary);
    background: rgba(108, 140, 255, 0.08);
}

.header__nav-btn--active {
    color: var(--accent);
    background: rgba(108, 140, 255, 0.12);
}

/* ---------- Main ---------- */
.main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 32px 20px;
}

/* ---------- Section visibility ---------- */
.input-section,
.progress-section,
.error-section,
.results-section,
.history-section {
    display: none;
}

.input-section.is-visible,
.progress-section.is-visible,
.error-section.is-visible,
.results-section.is-visible,
.history-section.is-visible {
    display: block;
}

/* ---------- Form Card ---------- */
.form-card {
    background: rgba(34, 38, 54, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
}

.form-card__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

/* ---------- Tab Bar ---------- */
.tab-bar {
    display: flex;
    gap: 0;
    margin-bottom: 24px;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    width: fit-content;
}

.tab-btn {
    background: var(--bg-input);
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 9px 22px;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
    border-right: 1px solid var(--border);
}

.tab-btn:last-child {
    border-right: none;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(108, 140, 255, 0.08);
}

.tab-btn--active {
    color: var(--accent);
    background: rgba(108, 140, 255, 0.15);
}

/* ---------- Form Rows ---------- */
.form-row {
    margin-bottom: 18px;
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 6px;
}

.form-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.form-row--inline {
    display: flex;
    gap: 12px;
}

.form-row--inline > * {
    flex: 1;
}

/* ---------- Form Inputs ---------- */
.form-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius);
    padding: 10px 14px;
    font-family: inherit;
    font-size: 0.9rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    color-scheme: dark;
}

.form-input:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 2px rgba(108, 140, 255, 0.15);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius);
    padding: 10px 14px;
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    color-scheme: dark;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%23a0a4b8' fill='none' stroke-width='1.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.form-select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 2px rgba(108, 140, 255, 0.15);
}

/* ---------- Toggle / Checkbox ---------- */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* ---------- Hidden row ---------- */
.form-row--hidden {
    display: none;
}

/* ---------- Form Error ---------- */
.form-error {
    color: var(--red);
    font-size: 0.8rem;
    margin-top: 10px;
    min-height: 1.2em;
}

/* ---------- Buttons ---------- */
.btn {
    padding: 8px 18px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    font-family: inherit;
    transition: background 0.2s, opacity 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn--primary {
    background: rgba(108, 140, 255, 0.15);
    color: var(--text-secondary);
    border: 1px solid rgba(108, 140, 255, 0.2);
}

.btn--primary:hover {
    background: rgba(108, 140, 255, 0.25);
    color: var(--text-primary);
}

.btn--primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn--lg {
    padding: 12px 32px;
    font-size: 0.95rem;
    width: 100%;
    justify-content: center;
    margin-top: 8px;
}

.btn--ghost {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.btn--ghost:hover {
    background: rgba(108, 140, 255, 0.08);
    color: var(--text-primary);
}

.btn--copied {
    color: var(--green) !important;
    border-color: rgba(74, 222, 128, 0.3) !important;
}

/* ---------- Progress ---------- */
.progress-card {
    background: rgba(34, 38, 54, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.progress-status {
    font-size: 0.95rem;
    color: var(--accent);
}

.progress-detail {
    font-size: 0.85rem;
    color: var(--text-muted);
    max-width: 400px;
}

.progress-elapsed {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

/* ---------- Error ---------- */
.error-card {
    background: rgba(34, 38, 54, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(248, 113, 113, 0.3);
    border-radius: 12px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    text-align: center;
}

.error-icon {
    width: 48px;
    height: 48px;
    color: var(--red);
}

.error-message {
    font-size: 0.95rem;
    color: var(--red);
    max-width: 400px;
}

/* ---------- Results: Summary Card ---------- */
.summary-card {
    background: rgba(34, 38, 54, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
}

.summary-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.summary-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.summary-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.summary-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--text-muted);
}

.summary-value {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

.summary-value--green { color: var(--green); }
.summary-value--red   { color: var(--red); }
.summary-value--muted { color: var(--text-muted); }

/* ---------- Predictions Table Card ---------- */
.table-card {
    background: rgba(34, 38, 54, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 20px;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 10px;
}

.table-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.table-search {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius);
    padding: 7px 12px;
    font-family: inherit;
    font-size: 0.8rem;
    width: 200px;
    transition: border-color 0.2s;
}

.table-search:focus {
    border-color: var(--accent);
    outline: none;
}

.table-search::placeholder {
    color: var(--text-muted);
}

.table-actions {
    display: flex;
    gap: 8px;
    padding: 12px 24px;
    border-top: 1px solid var(--border);
}

.table-container {
    overflow-x: auto;
}

/* ---------- Data Table ---------- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.data-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    padding: 10px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    user-select: none;
}

.data-table th[data-sortable] {
    cursor: pointer;
    transition: color 0.2s;
}

.data-table th[data-sortable]:hover {
    color: var(--accent);
}

.data-table th.sort-asc::after {
    content: " \25B2";
    font-size: 0.65rem;
}

.data-table th.sort-desc::after {
    content: " \25BC";
    font-size: 0.65rem;
}

.data-table td {
    padding: 10px 16px;
    border-bottom: 1px solid rgba(46, 51, 72, 0.5);
    color: var(--text-primary);
    vertical-align: top;
}

.data-table tbody tr:hover td {
    background: rgba(108, 140, 255, 0.04);
}

.data-table .col-num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* Hide actual column when not evaluating */
.table--no-eval .col-actual {
    display: none;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 24px 16px;
}

/* ---------- History Section ---------- */
.history-filters {
    background: rgba(34, 38, 54, 0.92);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 16px;
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.history-filters .filter-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-filters .filter-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    color: var(--text-muted);
}

.history-filters .form-input,
.history-filters .form-select {
    padding: 7px 12px;
    font-size: 0.8rem;
    width: auto;
    min-width: 120px;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
    .main {
        padding: 20px 12px;
    }

    .form-row--inline {
        flex-direction: column;
    }

    .tab-bar {
        width: 100%;
    }

    .tab-btn {
        flex: 1;
        text-align: center;
    }

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

    .table-header {
        flex-direction: column;
        align-items: stretch;
    }

    .table-search {
        width: 100%;
    }

    .history-filters {
        flex-direction: column;
        align-items: stretch;
    }

    .history-filters .form-input,
    .history-filters .form-select {
        width: 100%;
    }

    .btn--lg {
        padding: 12px 20px;
    }
}