:root {
    --bg: #f0f2f5;
    --card: #ffffff;
    --primary: #4CAF50;
    --primary-dark: #3e9c43;
    --primary-active: #144917;
    --border: #ddd;
    --text-color: #333;
    --muted: #444;
    --shadow: rgba(0,0,0,0.08);
    --radius: 12px;
    --input-radius: 6px;
}

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

body {
    font-family: "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    padding: 20px;
}

.container {
    max-width: 600px;
    width: 100%;
    margin: 10px auto;
    background: var(--card);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: 0 8px 18px var(--shadow);
}

h2, h3 {
    margin-bottom: 15px;
}

button {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--input-radius);
    padding: 14px;
    margin: 8px 0;
    cursor: pointer;
    width: 100%;
    display: block;
    font-size: 16px;
}

button:hover {
    background: var(--primary-dark);
}

button:hover {
    background: var(--primary-dark);
}

.hidden { display: none; }

.product {
    border: 1px solid var(--border);
    padding: 12px;
    margin: 10px 0;
    border-radius: var(--radius);
    background: #fafafa;
}

.row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.small {
    font-size: 0.85rem;
    color: var(--muted);
}

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid var(--border);
    border-radius: var(--input-radius);
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}


/* Mejoras mobile botones +/- */
.row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.row button {
    width: 48%;
    font-size: 18px;
    padding: 12px;
}

/* Animaciones suaves */
button {
    transition: transform 0.08s ease, background 0.2s ease;
}

button:active {
    transform: scale(0.96);
    background: var(--primary-active);
}

/* Feedback visual en cards */
.product {
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.product:active {
    transform: scale(0.98);
    box-shadow: 0 4px 10px var(--shadow);
}