@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

:root {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(15, 23, 42, 0.6);
    --gradient-1: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
    background-attachment: fixed;
    overflow-x: hidden;
}

header {
    text-align: center;
    padding: 4rem 2rem;
    position: relative;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
    animation: fadeInDown 1s ease-out;
}

.desktop-space {
    display: none;
}

@media (min-width: 768px) {
    h1 {
        font-size: 3.5rem;
    }
    .mobile-break {
        display: none;
    }
    .desktop-space {
        display: inline;
    }
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem 4rem;
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: 1fr 1fr;
        padding: 0 2rem 4rem;
        gap: 2rem;
    }
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 1.25rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 1s ease-out 0.4s both;
}

@media (min-width: 768px) {
    .glass-card {
        padding: 2rem;
    }
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(0, 0, 0, 0.4), 0 0 20px var(--accent-glow);
}

.glass-card.full-width {
    grid-column: 1 / -1;
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

@media (min-width: 768px) {
    h2 {
        font-size: 1.8rem;
    }
}

h3 {
    font-size: 1.3rem;
    margin: 1.5rem 0 0.5rem;
    color: #e2e8f0;
}

h3 a {
    text-decoration: underline;
    text-underline-offset: 3px;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

ul {
    list-style-type: none;
    margin-bottom: 1.5rem;
}

ul li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: #cbd5e1;
}

ul li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

.highlight {
    color: #fff;
    font-weight: 600;
}

.tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid rgba(59, 130, 246, 0.4);
    border-radius: 20px;
    font-size: 0.85rem;
    margin: 0.2rem;
    color: #93c5fd;
}

.laptop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.laptop-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.laptop-card:hover {
    border-color: var(--accent);
    background: rgba(30, 41, 59, 0.9);
}

.laptop-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: #10b981;
    margin-bottom: 1rem;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #60a5fa;
    text-decoration: underline;
}

/* Animations */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.illustration {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* Calculator Styles */
.calculator-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 1.5rem;
}

.calc-options {
    flex: 2;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.calc-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.calc-group label {
    font-weight: 600;
    color: #e2e8f0;
    font-size: 0.95rem;
}

.calc-select {
    padding: 0.8rem 1rem;
    border-radius: 8px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.4);
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2393c5fd%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem top 50%;
    background-size: 0.65rem auto;
}

.calc-select:focus, .calc-select:hover {
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

.calc-select option {
    background: #0f172a;
    color: #fff;
}

.calc-total-card {
    flex: 1;
    min-width: 250px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(59, 130, 246, 0.5);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.calc-total-card h3 {
    margin: 0 0 1rem;
    color: #93c5fd;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: none;
}

.calc-price {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
    transition: transform 0.15s ease;
}

.calc-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}