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

:root {
    --primary-dark: #0a0e27;
    --secondary-dark: #1a1f3a;
    --tertiary-dark: #2d3561;
    --light-blue: #3b82f6;
    --lighter-blue: #60a5fa;
    --brightest-blue: #93c5fd;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;
}

body {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 50%, var(--primary-dark) 100%);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #e0e7ff;
    line-height: 1.8;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

.bg-decoration {
    position: fixed;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    opacity: 0.05;
    pointer-events: none;
    z-index: 0;
}

.bg-decoration-1 {
    top: -100px;
    left: -100px;
    background: radial-gradient(circle, var(--light-blue), transparent);
    animation: float 20s ease-in-out infinite;
}

.bg-decoration-2 {
    bottom: -100px;
    right: -100px;
    background: radial-gradient(circle, var(--accent-purple), transparent);
    animation: float 25s ease-in-out infinite reverse;
}

@keyframes float {
    0%,
    100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(50px);
    }
}

nav {
    background: linear-gradient(90deg, var(--secondary-dark) 0%, var(--tertiary-dark) 50%, var(--secondary-dark) 100%);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--light-blue);
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.15);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(10px);
}

.logo {
    font-size: 2em;
    font-weight: 900;
    background: linear-gradient(135deg, var(--lighter-blue), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
    margin-right: 30px;
    cursor: pointer;
    text-decoration: none;
}

.nav-links {
    flex: 1;
    display: flex;
    gap: 20px;
    justify-content: center;
}

.nav-link {
    padding: 10px 15px;
    color: var(--brightest-blue);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    font-size: 0.95em;
    text-decoration: none;
    display: inline-block;
}

.nav-link:hover,
.nav-link.active {
    color: white;
    border-bottom-color: var(--lighter-blue);
}

.language-switcher {
    display: flex;
    gap: 8px;
    margin-left: auto;
    background: rgba(59, 130, 246, 0.1);
    padding: 8px 12px;
    border-radius: 25px;
    border: 1px solid var(--light-blue);
}

.lang-btn {
    padding: 8px 16px;
    border: 2px solid var(--light-blue);
    background: transparent;
    color: var(--brightest-blue);
    border-radius: 20px;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s ease;
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.lang-btn:hover,
.lang-btn.active {
    background: linear-gradient(135deg, var(--light-blue), var(--accent-cyan));
    color: white;
    border-color: var(--lighter-blue);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
}

header {
    background: linear-gradient(135deg, #1e3a5f 0%, #2d5a8c 50%, #1a2f4d 100%);
    padding: 60px 30px;
    text-align: center;
    box-shadow: 0 12px 48px rgba(59, 130, 246, 0.25);
    border-bottom: 3px solid var(--lighter-blue);
    position: relative;
    z-index: 10;
}

header h1 {
    color: var(--lighter-blue);
    font-size: 3em;
    margin-bottom: 15px;
    font-weight: 900;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    letter-spacing: 3px;
    position: relative;
    z-index: 11;
}

header .tagline {
    color: var(--brightest-blue);
    font-size: 1.2em;
    font-weight: 400;
    position: relative;
    z-index: 11;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 50px 30px;
    position: relative;
    z-index: 10;
}

.search-container {
    margin-bottom: 40px;
    text-align: center;
}

.search-input {
    width: 100%;
    max-width: 700px;
    padding: 18px 28px;
    font-size: 1.1em;
    border: 2px solid var(--light-blue);
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--tertiary-dark) 100%);
    border-radius: 12px;
    outline: none;
    transition: all 0.3s ease;
    color: var(--brightest-blue);
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
    color: rgba(147, 197, 253, 0.5);
}

.search-input:focus {
    border-color: var(--lighter-blue);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2), inset 0 0 10px rgba(59, 130, 246, 0.1);
}

.glossary {
    display: grid;
    gap: 25px;
}

.term-item {
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--tertiary-dark) 100%);
    border-left: 6px solid var(--light-blue);
    border-top: 1px solid rgba(59, 130, 246, 0.3);
    border-right: 1px solid rgba(59, 130, 246, 0.1);
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
    padding: 28px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 30px rgba(59, 130, 246, 0.15);
    transition: all 0.4s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.term-item::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.1), transparent);
    border-radius: 50%;
    pointer-events: none;
}

.term-item:hover {
    box-shadow: 0 12px 48px rgba(59, 130, 246, 0.4), 0 0 50px rgba(59, 130, 246, 0.2);
    transform: translateX(8px) translateY(-3px);
    border-left-color: var(--lighter-blue);
    background: linear-gradient(135deg, rgba(45, 53, 97, 0.9), rgba(45, 53, 97, 0.7));
}

.term-header {
    display: flex;
    align-items: center;
    margin-bottom: 18px;
    position: relative;
    z-index: 2;
}

.term-number {
    font-size: 1.6em;
    font-weight: 900;
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-right: 20px;
    color: white;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    font-family: 'Arial Black', sans-serif;
}

.color-1 {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.color-2 {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

.color-3 {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
}

.color-4 {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.term-name {
    font-size: 1.6em;
    font-weight: 800;
    color: var(--lighter-blue);
    margin: 0;
    letter-spacing: 1px;
}

.term-definition {
    font-size: 1.05em;
    color: #cbd5e1;
    line-height: 1.8;
    margin: 0;
    font-weight: 400;
    position: relative;
    z-index: 2;
}

.results-count {
    margin-top: 15px;
    color: var(--brightest-blue);
    font-weight: 700;
    font-size: 1.1em;
}

.no-results {
    text-align: center;
    padding: 80px 30px;
    color: #94a3b8;
    font-size: 1.4em;
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--tertiary-dark) 100%);
    border-radius: 15px;
    border: 2px solid rgba(59, 130, 246, 0.2);
    margin-top: 30px;
}

.zoom-controls {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    gap: 12px;
    z-index: 1000;
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--tertiary-dark) 100%);
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.4);
    border: 2px solid var(--light-blue);
    backdrop-filter: blur(10px);
}

.zoom-btn {
    width: 50px;
    height: 50px;
    border: 2px solid var(--light-blue);
    background: linear-gradient(135deg, var(--light-blue), var(--accent-cyan));
    color: white;
    border-radius: 50%;
    font-size: 1.5em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.zoom-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
}

.zoom-level {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 65px;
    font-weight: 800;
    color: var(--lighter-blue);
    font-size: 1.1em;
}

.scroll-to-top {
    position: fixed;
    bottom: 150px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--accent-purple), var(--light-blue));
    color: white;
    border: 2px solid var(--lighter-blue);
    border-radius: 50%;
    font-size: 1.6em;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.scroll-to-top:hover {
    transform: scale(1.15);
    box-shadow: 0 10px 32px rgba(59, 130, 246, 0.6);
}

.scroll-to-top.show {
    display: flex;
}

footer {
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--tertiary-dark) 50%, var(--secondary-dark) 100%);
    padding: 40px 30px;
    text-align: center;
    color: var(--brightest-blue);
    margin-top: 60px;
    border-top: 3px solid var(--light-blue);
    position: relative;
    z-index: 10;
}

footer p {
    margin: 8px 0;
    font-weight: 600;
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: linear-gradient(to bottom, var(--primary-dark), var(--secondary-dark));
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, var(--light-blue), var(--accent-cyan));
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, var(--lighter-blue), var(--light-blue));
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    .term-item {
        padding: 20px;
    }
    .term-name {
        font-size: 1.2em;
    }
    .search-input {
        font-size: 0.95em;
    }
    nav {
        flex-direction: column;
        gap: 10px;
    }
}