/* 
 * Kotobly Design System - Premium Modern Version
 * Unified Identity: Trust, Warmth, Quality, Modernity
 */

:root {
    /* --- Palette --- */
    --k-primary: #0F766E;
    /* Deep Teal - Trust & Depth */
    --k-primary-light: #14B8A6;
    --k-primary-dark: #134E4A;
    --k-secondary: #F8FAFC;
    /* Soft Slate Background */
    --k-accent: #D97706;
    /* Amber - Warmth & Engagement */
    --k-accent-soft: #FEF3C7;

    /* --- Interface States --- */
    --k-success: #10B981;
    --k-error: #EF4444;
    --k-warning: #F59E0B;
    --k-info: #3B82F6;

    /* --- Typography Colors --- */
    --k-text-main: #0F172A;
    /* Slate 900 */
    --k-text-muted: #64748B;
    /* Slate 500 */
    --k-text-on-primary: #FFFFFF;

    /* --- Neutral / Glass Colors --- */
    --k-white: #FFFFFF;
    --k-bg: #F8FAFC;
    --k-border: #E2E8F0;
    --k-glass-bg: rgba(255, 255, 255, 0.7);
    --k-glass-border: rgba(255, 255, 255, 0.4);

    /* --- Spacing & Radii --- */
    --k-radius-sm: 8px;
    --k-radius-md: 12px;
    --k-radius-lg: 20px;
    --k-radius-xl: 32px;
    --k-radius-full: 9999px;

    /* --- Shadows (Multi-layered Premium) --- */
    --k-shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.03);
    --k-shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --k-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

/* --- Base Styles --- */
body {
    background-color: var(--k-bg);
    color: var(--k-text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--k-text-main);
    font-weight: 800;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    font-size: 1rem;
    color: var(--k-text-muted);
}

/* --- Premium Buttons --- */
.k-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--k-radius-full);
    font-weight: 700;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    text-decoration: none !important;
}

.k-btn-primary {
    background: var(--k-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(15, 118, 110, 0.3);
}

.k-btn-primary:hover {
    background: var(--k-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(15, 118, 110, 0.4);
}

.k-btn-secondary {
    background: var(--k-white);
    color: var(--k-primary);
    border: 1px solid var(--k-border);
}

.k-btn-secondary:hover {
    background: var(--k-secondary);
    border-color: var(--k-primary-light);
}

.k-btn-ghost {
    background: transparent;
    color: var(--k-text-muted);
}

.k-btn-ghost:hover {
    background: var(--k-secondary);
    color: var(--k-primary);
}

/* --- Modern Cards --- */
.k-card {
    background: var(--k-white);
    border-radius: var(--k-radius-lg);
    border: 1px solid var(--k-border);
    padding: 24px;
    transition: var(--transition);
    box-shadow: var(--k-shadow-soft);
}

.k-card-premium {
    background: var(--k-white);
    border: 1px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: var(--k-shadow-lg);
}

.k-card:hover {
    box-shadow: var(--k-shadow-md);
    transform: translateY(-4px);
}

/* --- Inputs --- */
.k-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--k-bg);
    border: 1.5px solid var(--k-border);
    border-radius: var(--k-radius-md);
    font-size: 1rem;
    transition: all 0.2s;
    outline: none;
}

.k-input:focus {
    border-color: var(--k-primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.1);
}

/* --- Premium Badges --- */
.k-badge {
    padding: 4px 12px;
    border-radius: var(--k-radius-full);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.k-badge-gold {
    background: #FEF3C7;
    color: #D97706;
}

.k-badge-teal {
    background: #CCFBF1;
    color: #0F766E;
}

.k-badge-blue {
    background: #DBEAFE;
    color: #1E40AF;
}

/* --- Utilities --- */
.glass {
    background: rgba(255, 255, 255, 0.7) !important;
    backdrop-filter: blur(12px) !important;
    border: 1px solid rgba(255, 255, 255, 0.3) !important;
}

/* --- Bottom Nav (Mobile) --- */
.k-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--k-border);
    z-index: 2000;
    padding: 0 16px;
    align-items: center;
    justify-content: space-around;
}

@media (max-width: 768px) {
    .k-bottom-nav {
        display: flex;
    }
}

/* --- Skeleton & Loading --- */
.k-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #f7f7f7 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: k-skeleton-loading 1.5s infinite;
}

@keyframes k-skeleton-loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}