/* ═══════════════════════════════════════════════════════
   TÍNH LƯƠNG NHÂN VIÊN - Design System
   Dark Theme | Premium | Modern
   ═══════════════════════════════════════════════════════ */

/* ─── CSS Variables ──────────────────────────────────── */
:root {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-hover: #1f3460;

    --accent-gold: #ffd700;
    --accent-gold-dim: rgba(255, 215, 0, 0.15);
    --accent-blue: #0ea5e9;
    --accent-green: #4aedc4;
    --accent-red: #ff6b6b;

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b80;

    --border: #2a2a4a;
    --border-light: #3a3a5a;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow-gold: 0 0 20px rgba(255, 215, 0, 0.25);
    --shadow-glow-blue: 0 0 15px rgba(14, 165, 233, 0.2);

    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 200ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
    height: 28px;
}

/* ─── Header ─────────────────────────────────────────── */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 64px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-title {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-gold), #ffed4a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.header-center {
    display: flex;
    align-items: center;
    gap: 12px;
}

.month-display {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-gold);
    min-width: 160px;
    text-align: center;
}

.month-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.month-btn:hover {
    background: var(--bg-hover);
    color: var(--accent-gold);
    border-color: var(--accent-gold);
}

.header-right {
    display: flex;
    gap: 8px;
}

/* ─── Buttons ────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-light);
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 16px;
}

.btn-save {
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
    border-color: #0ea5e9;
}

.btn-save:hover {
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    box-shadow: var(--shadow-glow-blue);
}

.btn-calculate {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-gold), #f59e0b);
    color: #0f0f23;
    border: none;
    border-radius: var(--radius-md);
    margin-top: 8px;
}

.btn-calculate:hover {
    box-shadow: var(--shadow-glow-gold);
    transform: translateY(-2px);
}

.btn-export {
    background: linear-gradient(135deg, #10b981, #059669);
    border-color: #10b981;
    color: white;
}

.btn-export:hover {
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.3);
}

/* ─── Employee Tabs ──────────────────────────────────── */
.employee-tabs {
    display: flex;
    gap: 2px;
    padding: 0 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
}

.employee-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    white-space: nowrap;
}

.employee-tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--accent-gold);
    border-radius: 3px 3px 0 0;
    transition: width 300ms ease;
}

.employee-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.employee-tab.active {
    color: var(--text-primary);
}

.employee-tab.active::after {
    width: 80%;
}

.tab-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    border: 2px solid var(--border);
    transition: border-color var(--transition);
}

.employee-tab.active .tab-avatar {
    border-color: var(--accent-gold);
    background: var(--accent-gold-dim);
}

/* ─── Main Content ───────────────────────────────────── */
.main-content {
    padding: 20px 24px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 1400px;
    margin: 0 auto;
}

/* ─── Cards ──────────────────────────────────────────── */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-card);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ─── Form ───────────────────────────────────────────── */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-input {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 15px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    outline: none;
}

.form-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

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

.input-sm { width: 90px; }
.input-md { width: 140px; }
.input-lg { width: 100%; flex: 1; }
.input-full { width: 100%; margin-top: 8px; }

.input-sep {
    color: var(--text-muted);
    font-size: 13px;
    flex-shrink: 0;
}

.input-unit {
    color: var(--accent-gold);
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.auto-rate {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
    display: block;
}

/* ─── Upload Area ────────────────────────────────────── */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area:hover {
    border-color: var(--accent-blue);
    background: rgba(14, 165, 233, 0.05);
}

.upload-area.has-image {
    border-style: solid;
    padding: 8px;
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 13px;
}

.upload-icon {
    font-size: 24px;
}

.upload-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

/* ─── Result Section ─────────────────────────────────── */
.result-list {
    min-height: 300px;
}

.result-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--text-muted);
    gap: 12px;
}

.result-empty-icon {
    font-size: 48px;
    opacity: 0.5;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(42, 42, 74, 0.5);
    animation: fadeInRow 300ms ease forwards;
    opacity: 0;
}

@keyframes fadeInRow {
    to { opacity: 1; }
}

.result-row:nth-child(1) { animation-delay: 50ms; }
.result-row:nth-child(2) { animation-delay: 100ms; }
.result-row:nth-child(3) { animation-delay: 150ms; }
.result-row:nth-child(4) { animation-delay: 200ms; }
.result-row:nth-child(5) { animation-delay: 250ms; }
.result-row:nth-child(6) { animation-delay: 300ms; }
.result-row:nth-child(7) { animation-delay: 350ms; }
.result-row:nth-child(8) { animation-delay: 400ms; }
.result-row:nth-child(9) { animation-delay: 450ms; }
.result-row:nth-child(10) { animation-delay: 500ms; }

.result-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.result-value {
    font-size: 15px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.result-value.positive {
    color: var(--accent-green);
}

.result-value.positive::before {
    content: '+';
}

.result-value.negative {
    color: var(--accent-red);
}

.result-divider {
    height: 1px;
    background: var(--border);
    margin: 8px 0;
}

.result-divider.strong {
    height: 2px;
    background: linear-gradient(90deg, var(--accent-gold), transparent);
    margin: 12px 0;
}

.result-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    margin-top: 8px;
    background: var(--accent-gold-dim);
    border: 1px solid rgba(255, 215, 0, 0.2);
    border-radius: var(--radius-md);
    animation: glowPulse 2s ease-in-out infinite alternate;
}

@keyframes glowPulse {
    from { box-shadow: 0 0 10px rgba(255, 215, 0, 0.1); }
    to { box-shadow: 0 0 20px rgba(255, 215, 0, 0.2); }
}

.result-total .result-label {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.result-total .result-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-gold);
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

.result-image-preview {
    margin-top: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.result-image-preview img {
    width: 100%;
    display: block;
}

.result-image-label {
    font-size: 13px;
    color: var(--text-muted);
    padding: 8px 12px;
    background: var(--bg-tertiary);
    text-align: center;
}

/* ─── Summary Table ──────────────────────────────────── */
.card-summary {
    margin: 20px 24px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

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

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

.summary-table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 12px 16px;
    text-align: right;
    border-bottom: 2px solid var(--border);
}

.summary-table th:first-child {
    text-align: left;
}

.summary-table td {
    padding: 12px 16px;
    text-align: right;
    border-bottom: 1px solid rgba(42, 42, 74, 0.4);
    font-variant-numeric: tabular-nums;
    transition: background var(--transition);
}

.summary-table td:first-child {
    text-align: left;
    font-weight: 600;
}

.summary-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.summary-table .col-total,
.summary-table td:last-child {
    color: var(--accent-gold);
    font-weight: 700;
    font-size: 15px;
}

.summary-table th.col-total {
    color: var(--accent-gold);
}

.summary-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    justify-content: flex-end;
}

/* ─── Modal ──────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 300ms ease;
}

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

/* ─── Employee Management Form (in modal) ────────────── */
.emp-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
}

.emp-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.emp-card-name {
    font-weight: 600;
    font-size: 16px;
}

.emp-card-actions {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-danger {
    background: rgba(255, 107, 107, 0.15);
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.btn-danger:hover {
    background: rgba(255, 107, 107, 0.3);
}

.emp-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.emp-detail-label {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
}

.emp-detail-value {
    font-weight: 600;
    color: var(--text-primary);
}

.btn-add-emp {
    width: 100%;
    padding: 12px;
    border-style: dashed;
    color: var(--text-muted);
    margin-top: 8px;
}

.btn-add-emp:hover {
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

/* ─── Edit Employee Form (in modal) ──────────────────── */
.edit-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.edit-form .form-group {
    margin-bottom: 0;
}

.edit-form .form-group.full-width {
    grid-column: 1 / -1;
}

.edit-form .form-input {
    width: 100%;
}

.edit-actions {
    grid-column: 1 / -1;
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 8px;
}

/* ─── Toast ──────────────────────────────────────────── */
.toast-container {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px 20px;
    color: var(--text-primary);
    font-size: 14px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
    animation: slideInRight 300ms ease;
    min-width: 250px;
    display: flex;
    align-items: center;
    gap: 8px;
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast.success { border-left: 3px solid var(--accent-green); }
.toast.error { border-left: 3px solid var(--accent-red); }
.toast.info { border-left: 3px solid var(--accent-blue); }

/* ─── Salary Slip (for export - light theme) ─────────── */
.salary-slip {
    width: 800px;
    background: #ffffff;
    font-family: 'Inter', sans-serif;
    color: #1e293b;
    padding: 32px;
}

.slip-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid #e2e8f0;
}

.slip-store {
    font-size: 14px;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.slip-title {
    font-size: 22px;
    font-weight: 700;
    color: #1e293b;
    margin: 8px 0 4px;
}

.slip-employee {
    font-size: 16px;
    color: #475569;
}

.slip-section {
    margin-bottom: 16px;
}

.slip-section-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 12px;
    margin-bottom: 8px;
    border-radius: 6px;
}

.slip-section-title.positive {
    background: #f0fdf4;
    color: #16a34a;
    border-left: 4px solid #16a34a;
}

.slip-section-title.negative {
    background: #fef2f2;
    color: #dc2626;
    border-left: 4px solid #dc2626;
}

.slip-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 12px;
    font-size: 14px;
}

.slip-row:nth-child(even) {
    background: #f8fafc;
    border-radius: 4px;
}

.slip-row-label {
    color: #475569;
}

.slip-row-value {
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.slip-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    padding: 16px 20px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border-radius: 10px;
    border: 1px solid #f59e0b;
}

.slip-total-label {
    font-size: 16px;
    font-weight: 700;
    color: #92400e;
}

.slip-total-value {
    font-size: 28px;
    font-weight: 800;
    color: #92400e;
}

.slip-kiotviet {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 2px solid #e2e8f0;
}

.slip-kiotviet-title {
    font-size: 14px;
    font-weight: 600;
    color: #475569;
    margin-bottom: 8px;
}

.slip-kiotviet img {
    width: 100%;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
}

.slip-kiotviet-info {
    font-size: 13px;
    color: #64748b;
    margin-top: 8px;
    text-align: center;
}

.slip-footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 12px;
    border-top: 1px solid #e2e8f0;
    font-size: 11px;
    color: #94a3b8;
}

/* ─── Responsive ─────────────────────────────────────── */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 16px;
        gap: 8px;
    }

    .header-center {
        order: -1;
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 600px) {
    .header-title {
        font-size: 16px;
    }

    .emp-details {
        grid-template-columns: repeat(2, 1fr);
    }

    .edit-form {
        grid-template-columns: 1fr;
    }
}