:root {
    /* Brand colors - light mode (default) */
    --kc-purple: #6B3FF5;
    --kc-purple-dark: #5429D6;
    --kc-purple-light: #9B7BFF;
    --kc-purple-soft: #F1ECFF;

    --kc-bg: #FFFFFF;
    --kc-bg-alt: #FAFAFC;
    --kc-surface: #FFFFFF;
    --kc-text: #12111A;
    --kc-text-muted: #6B6B78;
    --kc-border: #ECECF1;

    --kc-success: #22C55E;
    --kc-danger: #EF4444;
    --kc-warning: #F59E0B;

    --kc-radius-sm: 8px;
    --kc-radius-md: 14px;
    --kc-radius-lg: 20px;
    --kc-shadow-sm: 0 1px 3px rgba(18, 17, 26, 0.06);
    --kc-shadow-md: 0 8px 24px rgba(18, 17, 26, 0.08);
    --kc-shadow-lg: 0 16px 48px rgba(18, 17, 26, 0.12);

    --kc-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="dark"] {
    --kc-bg: #0E0D14;
    --kc-bg-alt: #15141D;
    --kc-surface: #1A1924;
    --kc-text: #F5F4F8;
    --kc-text-muted: #9A98A8;
    --kc-border: #2A2935;
    --kc-purple-soft: #241C42;

    --kc-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --kc-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
    --kc-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--kc-font);
    background: var(--kc-bg);
    color: var(--kc-text);
    -webkit-font-smoothing: antialiased;
    transition: background 0.25s ease, color 0.25s ease;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ---------- Buttons ---------- */
.kc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--kc-radius-md);
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.kc-btn:active {
    transform: scale(0.97);
}

.kc-btn-primary {
    background: var(--kc-purple);
    color: #fff;
    box-shadow: 0 4px 14px rgba(107, 63, 245, 0.35);
}

.kc-btn-primary:hover {
    background: var(--kc-purple-dark);
}

.kc-btn-outline {
    background: transparent;
    border: 1.5px solid var(--kc-border);
    color: var(--kc-text);
}

.kc-btn-outline:hover {
    border-color: var(--kc-purple);
    color: var(--kc-purple);
}

.kc-btn-block {
    width: 100%;
}

/* ---------- Cards ---------- */
.kc-card {
    background: var(--kc-surface);
    border-radius: var(--kc-radius-lg);
    box-shadow: var(--kc-shadow-sm);
    border: 1px solid var(--kc-border);
    overflow: hidden;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.kc-card:hover {
    box-shadow: var(--kc-shadow-md);
    transform: translateY(-2px);
}

/* ---------- Inputs ---------- */
.kc-input {
    width: 100%;
    padding: 13px 16px;
    border-radius: var(--kc-radius-md);
    border: 1.5px solid var(--kc-border);
    background: var(--kc-bg-alt);
    color: var(--kc-text);
    font-size: 15px;
    font-family: var(--kc-font);
    transition: border-color 0.15s ease;
}

.kc-input:focus {
    outline: none;
    border-color: var(--kc-purple);
    background: var(--kc-surface);
}

/* ---------- Utility ---------- */
.kc-text-muted { color: var(--kc-text-muted); }
.kc-purple { color: var(--kc-purple); }
.kc-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---------- Skeleton loader ---------- */
.kc-skeleton {
    background: linear-gradient(90deg, var(--kc-border) 25%, var(--kc-bg-alt) 50%, var(--kc-border) 75%);
    background-size: 200% 100%;
    animation: kc-shimmer 1.4s ease-in-out infinite;
    border-radius: var(--kc-radius-sm);
}

@keyframes kc-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}