:root {
    --primary: #ff3b30;
    --primary-hover: #d63026;
    --bg: #0f1115;
    --card-bg: #1c1e24;
    --text: #ffffff;
    --text-muted: #8b949e;
    --border: #30363d;
    --accent: #2ea043;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(#30363d 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.2;
    z-index: -1;
}

.container {
    width: 90%;
    max-width: 500px;
    text-align: center;
}

header {
    margin-bottom: 2rem;
}

.badge {
    display: inline-block;
    background: rgba(255, 59, 48, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

p {
    color: var(--text-muted);
}

.calculator-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-group {
    flex: 1;
    text-align: left;
}

label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

input,
select {
    width: 100%;
    background: #0d1117;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.8rem;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
}

.currency-input {
    display: flex;
    gap: 0.5rem;
}

#currency {
    width: 60px;
}

.presets {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    justify-content: center;
}

.preset-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    border-color: var(--text);
    color: var(--text);
}

.display-area {
    background: #000;
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.display-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), transparent);
    animation: scan 2s linear infinite;
}

@keyframes scan {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

.cost-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.time-display {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-muted);
    font-size: 1.2rem;
}

.primary-btn {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.1s, background 0.2s;
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.primary-btn.running {
    background: var(--accent);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    width: 100%;
    background: #2d333b;
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
}

.text-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    margin-top: 1rem;
    cursor: pointer;
    text-decoration: underline;
}

.hidden {
    display: none;
}

.share-section {
    margin-top: 2rem;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}