/* === Nature Theme Variables === */
:root {
    --forest-dark: #0d1f0d;
    --forest-mid: #1a3a1a;
    --forest-light: #2d5a2d;
    --leaf-green: #4ade80;
    --leaf-light: #86efac;
    --moss: #22c55e;
    --bark: #78350f;
    --sky: #0ea5e9;
    --text-primary: #f0fdf4;
    --text-secondary: #bbf7d0;
    --text-muted: #86efac;
    --card-bg: rgba(26, 58, 26, 0.6);
    --card-hover: rgba(45, 90, 45, 0.8);
    --border: rgba(74, 222, 128, 0.2);
    --glow: 0 0 40px rgba(74, 222, 128, 0.2);
    --gradient-main: linear-gradient(135deg, var(--forest-dark) 0%, var(--forest-mid) 50%, var(--forest-light) 100%);
}

/* === Reset === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gradient-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* === Nature Background === */
.nature-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.leaf {
    position: absolute;
    font-size: 30px;
    opacity: 0.15;
    animation: float-leaf 20s ease-in-out infinite;
}

.leaf-1 { top: 10%; left: 10%; animation-delay: 0s; }
.leaf-2 { top: 20%; right: 15%; animation-delay: -4s; }
.leaf-3 { top: 60%; left: 5%; animation-delay: -8s; }
.leaf-4 { top: 70%; right: 10%; animation-delay: -12s; }
.leaf-5 { top: 40%; left: 80%; animation-delay: -16s; }

@keyframes float-leaf {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-20px) rotate(5deg); }
    50% { transform: translateY(0) rotate(0deg); }
    75% { transform: translateY(20px) rotate(-5deg); }
}

/* === Language Toggle === */
.lang-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: 4px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: 4px;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.lang-btn {
    padding: 8px 16px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s;
}

.lang-btn.active {
    background: var(--moss);
    color: var(--forest-dark);
}

.lang-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* === Main Container === */
.main-container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === Header === */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 20px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    font-size: 48px;
    filter: drop-shadow(0 0 10px rgba(74, 222, 128, 0.5));
}

.logo-text {
    font-family: 'Outfit', sans-serif;
    font-size: 42px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--leaf-green), var(--leaf-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 16px;
    color: var(--text-secondary);
    letter-spacing: 2px;
}

/* === Search Box === */
.search-container {
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 2px solid var(--border);
    border-radius: 20px;
    padding: 8px;
    transition: all 0.3s;
    box-shadow: var(--glow);
}

.search-box:focus-within {
    border-color: var(--leaf-green);
    box-shadow: 0 0 60px rgba(74, 222, 128, 0.3);
}

.search-icon {
    padding: 12px 16px;
    color: var(--text-muted);
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    font-size: 18px;
    color: var(--text-primary);
    outline: none;
    padding: 12px 0;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-btn {
    background: linear-gradient(135deg, var(--moss), var(--leaf-green));
    border: none;
    padding: 14px 32px;
    border-radius: 14px;
    color: var(--forest-dark);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

.search-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.5);
}

.current-engine {
    text-align: center;
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-muted);
}

.engine-name {
    color: var(--leaf-green);
    font-weight: 600;
}

/* === Category Tabs === */
.category-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: var(--card-hover);
    border-color: var(--leaf-green);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--moss), var(--leaf-green));
    border-color: var(--leaf-green);
    color: var(--forest-dark);
}

.tab-icon {
    font-size: 16px;
}

/* === Engine Grid === */
.engine-grid {
    margin-bottom: 32px;
}

.engine-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 12px;
}

.engine-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 12px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s;
}

.engine-btn:hover {
    background: var(--card-hover);
    border-color: var(--leaf-green);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.engine-btn.active {
    border-color: var(--leaf-green);
    background: rgba(74, 222, 128, 0.15);
    box-shadow: 0 0 20px rgba(74, 222, 128, 0.2);
}

.engine-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 700;
    color: white;
}

.engine-label {
    font-size: 12px;
    font-weight: 500;
    text-align: center;
    color: var(--text-secondary);
}

.engine-btn.active .engine-label {
    color: var(--leaf-green);
}

/* === Quick Links === */
.quick-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--border);
    margin-bottom: 32px;
}

.quick-title {
    font-size: 13px;
    color: var(--text-muted);
}

.quick-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 12px;
    border-radius: 8px;
    transition: all 0.3s;
}

.quick-links a:hover {
    background: var(--card-hover);
    color: var(--leaf-green);
}

/* === Footer === */
.footer {
    text-align: center;
    padding: 20px;
    margin-top: auto;
}

.footer p {
    font-size: 13px;
    color: var(--text-muted);
}

/* === Responsive === */
@media (max-width: 768px) {
    .main-container {
        padding: 20px 16px;
    }
    
    .logo-text {
        font-size: 32px;
    }
    
    .logo-icon {
        font-size: 36px;
    }
    
    .search-input {
        font-size: 16px;
    }
    
    .search-btn {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .category-tabs {
        gap: 6px;
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 13px;
    }
    
    .tab-btn span:not(.tab-icon) {
        display: none;
    }
    
    .engine-group {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }
    
    .engine-btn {
        padding: 12px 8px;
    }
    
    .engine-icon {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
    
    .engine-label {
        font-size: 10px;
    }
    
    .quick-links {
        gap: 8px;
        padding: 16px;
    }
    
    .quick-title {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .engine-group {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .lang-toggle {
        top: 10px;
        right: 10px;
    }
    
    .lang-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
}

/* === Animations === */
@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(74, 222, 128, 0.2); }
    50% { box-shadow: 0 0 40px rgba(74, 222, 128, 0.4); }
}

.search-box:focus-within {
    animation: pulse-glow 2s ease-in-out infinite;
}

/* === Scrollbar === */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--forest-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--forest-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--moss);
}