static/style.css

:root {
    --primary-color: #2962ff;
    --secondary-color: #f8fafe;
    --text-color: #1a1f36;
    --border-color: #e1e6ef;
    --hover-color: #edf2ff;
    --shadow-color: rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: 'Google Sans', 'Roboto', sans-serif;
    background: #fff;
    color: var(--text-color);
    min-height: 100vh;
}

.page-container {
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    max-width: 800px;
    width: 100%;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px var(--shadow-color);
}

header {
    text-align: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 2.5em;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), #1e88e5);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}

.translation-box {
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px var(--shadow-color);
    width: 100%;
    max-width: 900px;
    margin-top: 30px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.input-section, .output-section {
    padding: 30px;
}

.input-section {
    background: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
}

.input-header, .output-header {
    margin-bottom: 15px;
}

label {
    font-weight: 500;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.char-count {
    color: #5f6368;
    font-size: 0.8em;
}

textarea {
    width: 100%;
    min-height: 160px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: white;
    font-size: 1.1em;
    line-height: 1.5;
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(41, 98, 255, 0.1);
}

.controls {
    padding: 15px 30px;
    background: white;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.primary-btn, .secondary-btn, .icon-btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.primary-btn {
    background: var(--primary-color);
    color: white;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.3px;
    transition: transform 0.2s ease, background 0.2s ease;
}

.primary-btn:hover {
    background: #1e4bd8;
    transform: translateY(-1px);
}

.secondary-btn {
    background: #e0e0e0;
    color: #666;
}

.secondary-btn:hover {
    background: #d0d0d0;
}

.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: var(--hover-color);
    transform: scale(1.05);
}

.translation-result {
    min-height: 120px;
    background: white;
    border-radius: 12px;
    padding: 20px;
    font-size: 1.1em;
    line-height: 1.6;
}

/* Loading Spinner */
.loading-spinner {
    display: flex;
    justify-content: center;
    padding: 30px;
}

.spinner {
    width: 30px;
    height: 30px;
    border: 3px solid var(--secondary-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: #323232;
    color: white;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 0.95rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    animation: slideUp 0.3s ease;
}

/* Animations */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, 20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translate(-50%, 0); }
    to { opacity: 0; transform: translate(-50%, 20px); }
}

@keyframes slideUp {
    from { transform: translate(-50%, 100%); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .page-container {
        padding: 20px 15px;
    }
    
    .translation-box {
        border-radius: 12px;
        border-left: none;
        border-right: none;
    }

    .container {
        padding: 20px;
        margin: 10px;
    }

    h1 {
        font-size: 2em;
    }

    .input-section, .output-section {
        padding: 20px;
    }

    .controls {
        flex-direction: column;
        padding: 15px 20px;
    }

    .primary-btn, .secondary-btn {
        width: 100%;
        justify-content: center;
    }
}