:root {
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --primary: #2563eb;
    --success: #22c55e;
    --danger: #ef4444;
    --shadow: 0 10px 30px rgba(0,0,0,.08);
}

body.dark {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --primary: #3b82f6;
    --shadow: 0 10px 30px rgba(0,0,0,.5);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Inter", system-ui, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.container {
    width: 100%;
    max-width: 520px;
    background: var(--card);
    border-radius: 16px;
    padding: 18px;
    box-shadow: var(--shadow);
}

/* ===== Header ===== */
.top-bar {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
    align-items: center;
}

.top-bar h2 {
    margin: 0;
    font-size: 20px;
    text-align: center;
}

/* ===== Buttons ===== */
button {
    border: none;
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform .15s ease, opacity .15s ease;
    color: white;
}

button:active {
    transform: scale(.97);
}

button:hover {
    opacity: .9;
}

.lang-btn { background: var(--primary); }
.dark-btn { background: #334155; }
.copy-btn { background: var(--success); }
.clear-btn { background: var(--danger); }

/* ===== Textarea ===== */
textarea {
    width: 100%;
    height: 160px;
    margin-top: 14px;
    padding: 14px;
    border-radius: 12px;
    border: 1px solid transparent;
    background: rgba(0,0,0,.03);
    font-size: 15px;
    line-height: 1.5;
    resize: none;
    outline: none;
    color: var(--text);
}

body.dark textarea {
    background: rgba(255,255,255,.06);
}

textarea:focus {
    border-color: var(--primary);
}

/* ===== Action Buttons ===== */
.buttons {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

/* ===== Stats ===== */
.stats {
    margin-top: 18px;
    background: rgba(0,0,0,.03);
    border-radius: 12px;
    padding: 12px;
    font-size: 14px;
}

body.dark .stats {
    background: rgba(255,255,255,.05);
}

.stat {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px dashed rgba(0,0,0,.1);
}

body.dark .stat {
    border-bottom-color: rgba(255,255,255,.15);
}

.stat:last-child {
    border-bottom: none;
}

.stat span:last-child {
    font-weight: 700;
}

/* ===== Mobile ===== */
@media (max-width: 480px) {
    .top-bar {
        grid-template-columns: 1fr 1fr;
    }

    .top-bar h2 {
        grid-column: 1 / -1;
    }

    .buttons {
        flex-direction: column;
    }

    textarea {
        height: 130px;
    }
}