/* Google Fonts */
body {
    font-family: 'Poppins', Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: linear-gradient(135deg, #e3f0ff 0%, #c1e1ff 100%);
    transition: background 0.5s;
}

body.dark-mode {
    background: linear-gradient(135deg, #232526 0%, #414345 100%);
    color: #f3f3f3;
}

#darkModeToggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #fff;
    color: #232526;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: background 0.3s, color 0.3s;
    z-index: 100;
}
body.dark-mode #darkModeToggle {
    background: #232526;
    color: #fff;
}

.container {
    max-width: 500px;
    margin: 60px auto 30px auto;
    background: rgba(255,255,255,0.95);
    padding: 30px 20px;
    border-radius: 16px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.10);
    transition: background 0.5s, color 0.5s;
}
body.dark-mode .container {
    background: rgba(40,44,52,0.95);
    color: #f3f3f3;
}

h1, h2 {
    font-weight: 600;
    margin-bottom: 16px;
}

.language-selection,
.conversion-section {
    margin-bottom: 24px;
}

.selectors {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.selectors label {
    font-size: 0.95rem;
}

input[type="number"], select {
    font-family: inherit;
    font-size: 1rem;
    padding: 8px;
    margin: 6px 0;
    border: 1px solid #b0b0b0;
    border-radius: 6px;
    width: 100%;
    box-sizing: border-box;
    transition: border 0.3s;
}
input[type="number"]:focus, select:focus {
    border-color: #0077ff;
    outline: none;
}

.conversion-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

button {
    font-family: inherit;
    background: #0077ff;
    color: #fff;
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: background 0.3s, transform 0.2s;
}
button:hover {
    background: #005fcc;
    transform: translateY(-2px) scale(1.05);
}

.result-section {
    margin-top: 24px;
}

.result-card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.10);
    padding: 18px;
    margin-bottom: 16px;
    transition: background 0.5s, color 0.5s;
    font-size: 1.1rem;
}
body.dark-mode .result-card {
    background: #232526;
    color: #f3f3f3;
}

.visual-bar {
    width: 100%;
    height: 28px;
    background: #e3f0ff;
    border-radius: 8px;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 6px rgba(0,0,0,0.07);
    transition: background 0.5s;
}
body.dark-mode .visual-bar {
    background: #414345;
}

.visual-bar-inner {
    height: 100%;
    background: linear-gradient(90deg, #0077ff 0%, #00e431 100%);
    border-radius: 8px;
    transition: width 0.7s cubic-bezier(.4,2,.3,1);
}

.history-section {
    margin-top: 30px;
    border-top: 1px solid #e0e0e0;
    padding-top: 10px;
}

#history {
    margin-top: 10px;
}

.history-item {
    margin: 8px 0;
    padding: 10px;
    background: #f7faff;
    border-radius: 8px;
    box-shadow: 0 1px 6px rgba(0,0,0,0.07);
    font-size: 0.98rem;
    transition: background 0.5s, color 0.5s;
}
body.dark-mode .history-item {
    background: #232526;
    color: #f3f3f3;
}

@media (max-width: 600px) {
    .container {
        max-width: 98vw;
        padding: 16px 6px;
        margin: 20px auto;
    }
    .selectors {
        flex-direction: column;
        gap: 4px;
    }
    .conversion-buttons {
        flex-direction: column;
        gap: 8px;
    }
    #darkModeToggle {
        top: 10px;
        right: 10px;
        width: 38px;
        height: 38px;
        font-size: 1.2rem;
    }
}