:root {
    /* Color Tokens - Light (Default) */
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --text-muted: #64748b;
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(226, 232, 240, 0.8);
    --header-bg: rgba(255, 255, 255, 0.8);
    --accent-color: #4f46e5;
    --accent-hover: #4338ca;
    --accent-text: #ffffff;
    --badge-bg: #e2e8f0;
    --badge-text: #475569;
    --status-bg: #f1f5f9;
    --status-text: #64748b;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --glass-blur: blur(12px);
}

[data-theme="dark"] {
    --bg-color: #020617;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --card-bg: rgba(30, 41, 59, 0.5);
    --card-border: rgba(51, 65, 85, 0.5);
    --header-bg: rgba(15, 23, 42, 0.8);
    --accent-color: #818cf8;
    --accent-hover: #6366f1;
    --accent-text: #ffffff;
    --badge-bg: #334155;
    --badge-text: #cbd5e1;
    --status-bg: #1e293b;
    --status-text: #94a3b8;
    --shadow: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Background Decoration */
.background-radial {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 0%, rgba(79, 70, 229, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

[data-theme="dark"] .background-radial {
    background: radial-gradient(circle at 50% 0%, rgba(129, 140, 248, 0.1) 0%, transparent 50%);
}

/* Header */
.main-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--header-bg);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--card-border);
    padding: 1.5rem 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.controls {
    display: flex;
    gap: 0.75rem;
}

.custom-select {
    appearance: none;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.custom-select:hover {
    border-color: var(--accent-color);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 3rem 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* Tool Cards */
.tool-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow);
}

.tool-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
}

.tool-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.tool-desc {
    color: var(--text-muted);
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    flex: 1;
}

.tool-meta {
    margin-bottom: 1.5rem;
}

.meta-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.lang-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.badge {
    background-color: var(--badge-bg);
    color: var(--badge-text);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 0.375rem;
    letter-spacing: 0.025em;
}

.status-line {
    font-size: 0.8125rem;
    color: var(--status-text);
    background-color: var(--status-bg);
    padding: 0.4rem 0.75rem;
    border-radius: 0.5rem;
    display: inline-block;
    margin-bottom: 1.5rem;
    width: fit-content;
}

.btn-open {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--accent-text);
    text-decoration: none;
    text-align: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: background-color 0.2s ease;
}

.btn-open:hover {
    background-color: var(--accent-hover);
}

/* Footer */
.main-footer {
    padding: 2rem 0;
    border-top: 1px solid var(--card-border);
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
}

.footer-meta {
    margin-top: 0.5rem;
    opacity: 0.8;
}

.loading-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
    
    .controls {
        width: 100%;
        justify-content: flex-start;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .brand h1 {
        font-size: 1.25rem;
    }
}