/* HNXELF.com - Physics Science Theme */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Exo+2:wght@300;400;600&display=swap');

:root {
    --primary: #00D4FF;
    --secondary: #7B2CBF;
    --accent: #FF6B35;
    --dark: #0a0a14;
    --darker: #05050a;
    --light: #e0e6ed;
    --tech: #00B4D8;
    --glow: #00D4FF;
    --shadow: rgba(0, 212, 255, 0.4);
}

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

body {
    font-family: 'Exo 2', sans-serif;
    background: var(--darker);
    color: var(--light);
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(123, 44, 191, 0.15) 0%, transparent 50%),
        linear-gradient(180deg, var(--darker) 0%, var(--dark) 100%);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

header {
    background: linear-gradient(90deg, var(--dark), rgba(0,212,255,0.3), var(--dark));
    padding: 15px 0;
    box-shadow: 0 5px 30px var(--shadow);
    border-bottom: 2px solid var(--primary);
}

header .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }

.logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 28px;
    color: var(--primary);
    text-decoration: none;
    text-shadow: 0 0 20px var(--shadow);
    letter-spacing: 3px;
}

nav { display: flex; gap: 10px; flex-wrap: wrap; }

nav a {
    color: var(--light);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s;
    border: 1px solid transparent;
}

nav a:hover, nav a.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(0, 212, 255, 0.1);
    box-shadow: 0 0 15px var(--shadow);
}

.hero {
    text-align: center;
    padding: 70px 20px;
    background: linear-gradient(180deg, transparent, rgba(0, 212, 255, 0.1));
}

.hero h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 42px;
    font-weight: 900;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
}

.hero p { font-size: 20px; color: var(--tech); }

.main { padding: 40px 20px; min-height: 60vh; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.card {
    background: linear-gradient(145deg, rgba(0, 212, 255, 0.1), rgba(5, 5, 10, 0.95));
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    border: 2px solid rgba(0, 212, 255, 0.3);
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: 0 20px 50px var(--shadow);
}

.card-icon {
    font-size: 50px;
    padding: 25px;
    text-align: center;
    background: rgba(0,0,0,0.3);
}

.card-body { padding: 20px; text-align: center; }

.card-body h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--primary);
}

.card-body p { font-size: 14px; color: var(--light); opacity: 0.8; }

.btn {
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(90deg, var(--tech), var(--primary));
    color: var(--dark);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: 15px;
    transition: all 0.3s;
    border: 1px solid var(--primary);
    cursor: pointer;
}

.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px var(--shadow);
}

.tool-page, .article-page {
    max-width: 700px;
    margin: 0 auto;
    background: linear-gradient(145deg, rgba(0, 212, 255, 0.08), rgba(5, 5, 10, 0.95));
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.5);
    border: 2px solid var(--tech);
}

.tool-page h1, .article-page h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 28px;
    text-align: center;
    margin-bottom: 25px;
    color: var(--primary);
}

.article-page h1 { font-size: 32px; }

.article-page .meta { color: var(--tech); margin-bottom: 30px; padding-bottom: 20px; border-bottom: 2px dashed rgba(0,212,255,0.3); }

.article-page h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 22px;
    margin: 30px 0 15px;
    color: var(--secondary);
}

.article-page p { line-height: 1.9; margin-bottom: 18px; font-size: 17px; }

input, select, textarea {
    width: 100%;
    padding: 14px;
    margin-bottom: 15px;
    background: rgba(0,0,0,0.5);
    border: 2px solid rgba(0, 212, 255, 0.4);
    border-radius: 8px;
    color: var(--light);
    font-size: 16px;
}

input:focus, textarea:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 10px var(--shadow); }

.result {
    margin-top: 25px;
    padding: 25px;
    background: rgba(0, 212, 255, 0.15);
    border-radius: 12px;
    text-align: center;
    font-size: 18px;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.result.error { border-color: #ff4757; color: #ff6b6b; background: rgba(255,71,87,0.1); }

footer {
    background: linear-gradient(90deg, var(--dark), rgba(0,212,255,0.3), var(--dark));
    padding: 30px 0;
    margin-top: 60px;
    text-align: center;
    border-top: 2px solid var(--primary);
}

footer p { color: var(--light); font-size: 15px; }
footer a { color: var(--primary); text-decoration: none; margin: 0 10px; }

.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.breadcrumb { margin-bottom: 25px; color: var(--tech); }
.breadcrumb a { color: var(--primary); text-decoration: none; }

h2 { font-family: 'Orbitron', sans-serif; font-size: 26px; margin: 40px 0 20px; color: var(--light); }

@media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .grid { grid-template-columns: 1fr; }
    .tool-page, .article-page { padding: 25px; }
    .logo { font-size: 24px; }
}