:root {
    /* Color Palette - Balanced theme */
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8ecf1;
    --bg-hover: #f0f4f8;
    
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-light: #8899a6;
    --text-white: #ffffff;
    
    --accent-primary: #3498db;
    --accent-success: #2ecc71;
    --accent-warning: #f39c12;
    --accent-danger: #e74c3c;
    
    --border-color: #dce1e8;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    
    --sidebar-width: 380px;
    --header-height: 70px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* App Header */
.app-header {
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    flex: 0 0 auto;
}

.app-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.mode-toggle {
    display: inline-flex;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 4px;
    gap: 4px;
}

.mode-btn {
    padding: 10px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

.mode-btn.active {
    background: white;
    color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.header-right {
    flex: 0 0 auto;
}

.company-dropdown {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    background: white;
    cursor: pointer;
    min-width: 200px;
    transition: var(--transition);
}

.company-dropdown:hover {
    border-color: var(--accent-primary);
}

.company-dropdown:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

/* Main Layout */
.main-layout {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.mode-content {
    display: none;
    height: calc(100vh - var(--header-height));
}

.mode-content.active {
    display: flex;
}

/* Interview Mode Layout */
#interview-mode {
    display: none;
}

#interview-mode.active {
    display: flex;
}

/* Experiences Sidebar */
.experiences-sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    background: white;
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.filter-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.filter-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: white;
    color: var(--text-primary);
    cursor: pointer;
}

.stats-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-item {
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: var(--radius-sm);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.experiences-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

/* Experience Card */
.exp-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.exp-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}

.exp-card.active {
    border-color: var(--accent-primary);
    background: #f0f8ff;
    box-shadow: var(--shadow-md);
}

.exp-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.exp-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.exp-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    white-space: nowrap;
}

.exp-badge.selected {
    background: #d4edda;
    color: #155724;
}

.exp-badge.rejected {
    background: #f8d7da;
    color: #721c24;
}

.exp-badge.in-process {
    background: #fff3cd;
    color: #856404;
}

.exp-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.exp-card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.exp-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.rounds-count {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
}

.source-tag {
    font-size: 11px;
    color: var(--accent-primary);
    font-weight: 600;
}

/* Experience Content */
.experience-content {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
    background: var(--bg-primary);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 48px;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.empty-state h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 500px;
}

.feature-list {
    list-style: none;
    margin-top: 24px;
    text-align: left;
}

.feature-list li {
    font-size: 15px;
    padding: 8px 0;
    color: var(--text-secondary);
}

/* Experience Header */
.experience-header {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.header-row-1 {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 16px;
}

.exp-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.result-badge {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
}

.result-badge.selected {
    background: var(--accent-success);
    color: white;
}

.result-badge.rejected {
    background: var(--accent-danger);
    color: white;
}

.result-badge.in-process {
    background: var(--accent-warning);
    color: white;
}

.header-row-2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.exp-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

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

.meta-item strong {
    color: var(--text-primary);
    margin-right: 4px;
}

.source-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.source-link:hover {
    gap: 10px;
}

.compensation-bar {
    display: flex;
    gap: 16px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.comp-item {
    flex: 1;
    text-align: center;
    padding: 12px;
    background: white;
    border-radius: var(--radius-sm);
}

.comp-item.highlight {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-success));
}

.comp-item.highlight .comp-label,
.comp-item.highlight .comp-value {
    color: white;
}

.comp-label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.comp-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

/* Rounds Tabs */
.rounds-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    overflow-x: auto;
    padding: 4px;
}

.round-tab {
    padding: 12px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    white-space: nowrap;
}

.round-tab:hover {
    border-color: var(--accent-primary);
    background: var(--bg-hover);
}

.round-tab.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Rounds Content */
.rounds-content {
    min-height: 400px;
}

.round-panel {
    display: none;
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.round-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.round-header {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--bg-tertiary);
}

.round-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.round-info {
    display: flex;
    gap: 16px;
    font-size: 14px;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.round-info-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.questions-section {
    margin-top: 24px;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.question-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    border-left: 4px solid var(--accent-primary);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.question-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    flex: 1;
}

.difficulty-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
}

.difficulty-badge.easy {
    background: #d4edda;
    color: #155724;
}

.difficulty-badge.medium {
    background: #fff3cd;
    color: #856404;
}

.difficulty-badge.hard {
    background: #f8d7da;
    color: #721c24;
}

.question-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
}

.topic-tag {
    background: white;
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.leetcode-link {
    display: inline-block;
    margin-top: 8px;
    color: var(--accent-primary);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
}

.leetcode-link:hover {
    text-decoration: underline;
}

/* Tips Section */
.tips-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-top: 24px;
    color: white;
}

.tips-section h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.tips-list {
    list-style: none;
}

.tips-list li {
    padding: 10px 0;
    padding-left: 28px;
    position: relative;
    font-size: 15px;
    line-height: 1.5;
}

.tips-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #2ecc71;
    font-weight: 700;
    font-size: 18px;
}

/* Responsive */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 320px;
    }
}

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        height: auto;
        padding: 16px;
        gap: 12px;
    }
    
    .header-left,
    .header-center,
    .header-right {
        width: 100%;
    }
    
    .experiences-sidebar {
        display: none;
    }
    
    #interview-mode.active {
        display: block;
    }
    
    .experience-content {
        padding: 16px;
    }
}

/* Scrollbar Styles */
.experiences-list::-webkit-scrollbar,
.experience-content::-webkit-scrollbar {
    width: 8px;
}

.experiences-list::-webkit-scrollbar-track,
.experience-content::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.experiences-list::-webkit-scrollbar-thumb,
.experience-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.experiences-list::-webkit-scrollbar-thumb:hover,
.experience-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}