* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: #1a1a2e url('./media/background.jpg') center / cover fixed;
    color: #fff;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Main container */
.container {
    width: 100%;
    max-width: 550px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(15px);
    border-radius: 24px;
    padding: 35px 25px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Title */
h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 25px;
    background: linear-gradient(135deg, #3498db, #e67e22);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Input area */
.input-area {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
}

.input-area input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.4);
    color: #fff;
    font-size: 1.1rem;
    text-align: center;
    outline: none;
    transition: border-color 0.2s;
}

.input-area input:focus {
    border-color: #e67e22;
    box-shadow: 0 0 10px rgba(230, 126, 34, 0.3);
}

.input-area button {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 10px;
    background: #e67e22;
    color: #fff;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.input-area button:hover {
    background: #d35400;
    box-shadow: 0 8px 20px rgba(230, 126, 34, 0.3);
}

/* Results grid */
.results-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 15px;
}

/* Result cards */
.result-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 20px;
    text-align: left;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: 0.2s;
}

.result-card.decimal .card-value {
    color: #e67e22;
}

.result-card.roman .card-value {
    color: #3498db;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.card-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.7;
}

.copy-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #fff;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.copy-btn.copied {
    background: #2ecc71;
}

.card-value {
    font-size: 2rem;
    font-weight: bold;
    word-break: break-all;
    min-height: 2.5rem;
}

.roman .card-value {
    color: #3498db;
}

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

/* Message */
#message {
    font-size: 0.9rem;
    min-height: 1.2rem;
    color: #e74c3c;
}

/* Responsive */
@media (max-width: 500px) {
    .container {
        padding: 20px 15px;
    }

    .input-area {
        flex-direction: column;
    }

    .card-value {
        font-size: 1.5rem;
    }
}