:root {
    --bg-page: #f8fafc;
    --bg-surface: #ffffff;
    --border-subtle: #f1f5f9;
    --border-default: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --text-primary: #09090b;
    --text-secondary: #52525b;
    --text-tertiary: #a1a1aa;
    
    --tier-s-bg: #fffbeb;
    --tier-s-text: #b45309;
    --tier-s-border: #fde68a;

    --tier-a-bg: #eff6ff;
    --tier-a-text: #1d4ed8;
    --tier-a-border: #bfdbfe;

    --tier-b-bg: #f5f3ff;
    --tier-b-text: #6d28d9;
    --tier-b-border: #ddd6fe;

    --tier-c-bg: #f4f4f5;
    --tier-c-text: #52525b;
    --tier-c-border: #e4e4e7;
}

body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Helvetica, Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    letter-spacing: -0.015em;
    -webkit-font-smoothing: antialiased;
}

.app-navbar {
    background: #ffffff;
    border-bottom: 1px solid var(--border-default);
}

.app-card {
    background: #ffffff;
    border: 1px solid var(--border-default);
    border-radius: 12px;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.app-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.05);
}

.tier-tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.72rem;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.tier-tag-s {
    background-color: var(--tier-s-bg);
    color: var(--tier-s-text);
    border: 1px solid var(--tier-s-border);
}

.tier-tag-a {
    background-color: var(--tier-a-bg);
    color: var(--tier-a-text);
    border: 1px solid var(--tier-a-border);
}

.tier-tag-b {
    background-color: var(--tier-b-bg);
    color: var(--tier-b-text);
    border: 1px solid var(--tier-b-border);
}

.tier-tag-c {
    background-color: var(--tier-c-bg);
    color: var(--tier-c-text);
    border: 1px solid var(--tier-c-border);
}

.tech-bubble {
    display: inline-flex;
    align-items: center;
    background-color: #f4f4f5;
    color: var(--text-secondary);
    border: 1px solid #e4e4e7;
    font-size: 0.72rem;
    font-weight: 500;
    padding: 0.15rem 0.5rem;
    border-radius: 6px;
    margin-right: 0.3rem;
    margin-bottom: 0.3rem;
}

.btn-brand {
    background-color: #09090b;
    border: 1px solid #09090b;
    color: #ffffff;
    font-weight: 500;
    font-size: 0.85rem;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    transition: all 0.15s ease;
}

.btn-brand:hover {
    background-color: #27272a;
    border-color: #27272a;
    color: #ffffff;
}

.btn-ghost {
    background-color: #ffffff;
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.85rem;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    transition: all 0.15s ease;
}

.btn-ghost:hover {
    background-color: #f8fafc;
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.btn-pill-filter {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    border: 1px solid var(--border-default);
    background: #ffffff;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.15s ease;
}

.btn-pill-filter:hover, .btn-pill-filter.active {
    border-color: #09090b;
    background: #09090b;
    color: #ffffff;
}

.form-control, .form-select {
    border-color: var(--border-default);
    background-color: #ffffff;
    color: var(--text-primary);
    font-size: 0.875rem;
    border-radius: 8px;
    padding: 0.6rem 0.9rem;
}

.form-control:focus, .form-select:focus {
    border-color: #09090b;
    box-shadow: 0 0 0 1px #09090b;
}

.score-display {
    font-variant-numeric: tabular-nums;
    font-weight: 700;
}

.app-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-default);
    font-size: 0.85rem;
}

.app-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

.app-footer a:hover {
    color: var(--text-primary);
}

.hero-box {
    background: #ffffff;
    border: 1px solid var(--border-default);
    border-radius: 16px;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.04);
}