:root {
    --bg-dark: #07070a;
    --bg-glass: rgba(20, 20, 25, 0.6);
    --purple: #9b51e0;
    --purple-glow: rgba(155, 81, 224, 0.5);
    --white: #ffffff;
    --gray: #888899;
    --text-muted: #5a5a6a;
    --border-color: rgba(255, 255, 255, 0.05);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Background Grid */
.grid-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image:
        linear-gradient(var(--border-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-color) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: -1;
    opacity: 0.5;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 4rem;
    animation: fadeInDown 0.8s ease;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: 2px;
}

.logo .dot {
    width: 8px;
    height: 8px;
    background-color: var(--purple);
    border-radius: 50%;
    margin-right: 10px;
    box-shadow: 0 0 10px var(--purple);
}

.purple-text {
    color: var(--purple);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    color: var(--gray);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--white);
}

.header-btn {
    background-color: var(--purple);
    color: var(--white);
    border: none;
    padding: 0.6rem 1.5rem;
    border-radius: 4px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    box-shadow: 0 0 15px var(--purple-glow);
}

.header-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--purple-glow);
}

/* Main Content */
.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 2rem 5rem 2rem;
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeInUp 1s ease;
}

.tag {
    color: var(--purple);
    font-size: 0.8rem;
    letter-spacing: 4px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    padding: 0.4rem 1rem;
    display: inline-block;
    border-radius: 4px;
    background: rgba(155, 81, 224, 0.05);
}

.title-3d {
    font-size: 7rem;
    font-weight: 900;
    letter-spacing: -2px;
    line-height: 1;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.white-part {
    color: var(--white);
    text-shadow:
        0px 2px 0px #ccc,
        0px 4px 0px #999,
        0px 6px 0px #666,
        0px 8px 10px rgba(0, 0, 0, 0.5);
}

.purple-part {
    color: var(--purple);
    text-shadow:
        0px 2px 0px #7a3db4,
        0px 4px 0px #5c2c8a,
        0px 6px 0px #411d66,
        0px 8px 10px rgba(0, 0, 0, 0.5);
}

.subtitle {
    color: var(--text-muted);
    letter-spacing: 6px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Calculator Glassmorphism */
.calculator-wrapper {
    width: 100%;
    max-width: 1100px;
    animation: fadeInUp 1.2s ease;
}

.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--gray);
    padding: 0.8rem 2rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--white);
}

.tab-btn.active {
    background: var(--purple);
    color: var(--white);
    border-color: var(--purple);
    box-shadow: 0 0 20px var(--purple-glow);
}

.calculator-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    min-height: 400px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.divider {
    width: 1px;
    background: var(--border-color);
}

.input-section,
.results-section {
    padding: 3rem;
}

.results-section h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--purple);
    letter-spacing: 2px;
}

/* Input Items */
.item-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.item-row:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.item-info {
    display: flex;
    flex-direction: column;
}

.item-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.item-category {
    font-size: 0.8rem;
    color: var(--gray);
}

.item-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.qty-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
}

.qty-btn:hover {
    background: var(--purple);
    box-shadow: 0 0 10px var(--purple-glow);
}

.qty-input {
    width: 50px;
    background: transparent;
    border: 1px solid var(--border-color);
    color: white;
    text-align: center;
    padding: 0.4rem;
    border-radius: 4px;
    font-family: inherit;
    font-weight: 600;
}

.qty-input:focus {
    outline: none;
    border-color: var(--purple);
}

/* Results Grid */
.results-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-card {
    background: rgba(155, 81, 224, 0.1);
    border: 1px solid rgba(155, 81, 224, 0.2);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s;
}

.result-card:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    border-color: var(--purple);
}

.result-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
}

.result-label {
    font-size: 0.9rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.result-card.empty {
    grid-column: 1 / -1;
    background: transparent;
    border: 1px dashed var(--border-color);
    color: var(--gray);
    font-size: 0.9rem;
}

.result-card.money {
    background: rgba(46, 204, 113, 0.1);
    border-color: rgba(46, 204, 113, 0.2);
}

.result-card.money .result-value {
    color: #2ecc71;
}

/* 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);
    }
}

/* Responsive */
@media (max-width: 992px) {
    .calculator-glass {
        grid-template-columns: 1fr;
    }

    .divider {
        width: 100%;
        height: 1px;
    }

    .title-3d {
        font-size: 4rem;
    }
}