:root {
    /* Career Blue & Achievement Gold Theme */
    --app-bg: #fdfbf7;
    --panel-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 122, 255, 0.1);
    --text-primary: #2c2c2c;
    --text-secondary: #7a7a7a;

    --accent-red: #d63b1d;
    --accent-gold: #c5a059;
    --accent-blue: #007aff;

    --level1-color: #27c93f;
    /* Entry: Green */
    --level2-color: #007aff;
    /* Mid: Blue */
    --level3-color: #c5a059;
    /* Senior: Gold */
    --level4-color: #d63b1d;
    /* Leadership: Red */

    --path1-color: #007aff;
    --path2-color: #27c93f;
    --path3-color: #c5a059;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);

    --font-family: "Noto Serif SC", "Outfit", serif;
    --font-mono: "JetBrains Mono", monospace;
    --font-title: "Ma Shan Zheng", cursive;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--app-bg);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('https://images.unsplash.com/photo-1497366216548-37526070297c?q=80&w=2669&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
}

.app-container {
    width: 95vw;
    height: 90vh;
    max-width: 1800px;
    background: rgba(255, 252, 245, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
.main-header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.5);
}

.header-content h1 {
    font-family: var(--font-title);
    font-size: 2rem;
    font-weight: 400;
    color: var(--accent-blue);
}

.highlight {
    color: var(--accent-gold);
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: -5px;
}

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

.career-select {
    padding: 10px 16px;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: #fff;
    font-family: var(--font-family);
    font-size: 0.85rem;
    cursor: pointer;
    min-width: 180px;
}

.apple-btn {
    padding: 10px 20px;
    border-radius: 10px;
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    border: none;
}

.primary-btn {
    background: var(--accent-blue);
    color: white;
}

.primary-btn:hover:not(:disabled) {
    background: #005ecb;
}

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

.secondary-btn {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

.secondary-btn:hover {
    background: #f5f5f5;
}

/* Main Stage */
.main-stage {
    flex-grow: 1;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2px;
    background: rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.graph-panel,
.results-panel {
    background: var(--panel-bg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.4);
}

.panel-header h3 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.panel-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Graph */
.graph-container {
    flex-grow: 1;
    position: relative;
    overflow: hidden;
}

.graph-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
}

.nodes-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
}

.career-node {
    position: absolute;
    padding: 10px 14px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    border: 2px solid;
    min-width: 90px;
}

.career-node:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.career-node.level1 {
    border-color: var(--level1-color);
}

.career-node.level2 {
    border-color: var(--level2-color);
}

.career-node.level3 {
    border-color: var(--level3-color);
}

.career-node.level4 {
    border-color: var(--level4-color);
}

.career-node.start {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.career-node.goal {
    background: var(--accent-gold);
    color: white;
    border-color: var(--accent-gold);
}

.career-node.on-path {
    background: linear-gradient(135deg, #fff 0%, #f0f8ff 100%);
    border-width: 3px;
}

.career-edge {
    stroke: #999;
    stroke-width: 1.5;
    fill: none;
    marker-end: url(#arrow-normal);
    opacity: 0.2;
    transition: all 0.3s ease;
}

.career-edge.path1 {
    stroke: var(--path1-color);
    stroke-width: 3;
    opacity: 1;
    marker-end: url(#arrow-path1);
}

.career-edge.path2 {
    stroke: var(--path2-color);
    stroke-width: 3;
    opacity: 1;
    marker-end: url(#arrow-path2);
}

.career-edge.path3 {
    stroke: var(--path3-color);
    stroke-width: 3;
    opacity: 1;
    marker-end: url(#arrow-path3);
}

/* Legend */
.level-legend {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.6);
    border-top: 1px solid var(--glass-border);
    display: flex;
    gap: 20px;
    justify-content: center;
}

.level-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.level-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.level-dot.level1 {
    background: var(--level1-color);
}

.level-dot.level2 {
    background: var(--level2-color);
}

.level-dot.level3 {
    background: var(--level3-color);
}

.level-dot.level4 {
    background: var(--level4-color);
}

/* Results */
.results-panel {
    overflow-y: auto;
}

.results-container {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.path-card {
    background: #fff;
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 12px;
    border-left: 4px solid;
    box-shadow: var(--shadow-sm);
}

.path-card.path1 {
    border-color: var(--path1-color);
}

.path-card.path2 {
    border-color: var(--path2-color);
}

.path-card.path3 {
    border-color: var(--path3-color);
}

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

.path-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.path-badge {
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-secondary);
}

.path-steps {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.path-step {
    padding: 6px 10px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 6px;
    font-size: 0.75rem;
}

.path-arrow {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Insight */
.insight-section {
    padding: 20px;
    background: linear-gradient(135deg, #fff5e6 0%, #fff 100%);
    border-top: 2px solid var(--accent-gold);
}

.insight-section h4 {
    font-size: 1rem;
    color: var(--accent-gold);
    margin-bottom: 8px;
}

.insight-section p {
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.6;
}