:root {
    --bg: #f4f4f4;
    --card: #ffffff;
    --text: #333;
    --muted: #666;
    --primary: #007bff;
    --primary-hover: #0056b3;
    --border: #ccc;
}

/* ========================= */
/* 🖤 TRUE AMOLED DARK MODE */
/* ========================= */

body.dark {
    --bg: #000000;
    --card: #0a0a0a;
    --text: #f2f2f2;
    --muted: #9a9a9a;
    --primary: #4da3ff;
    --primary-hover: #1f7fe0;
    --border: #1a1a1a;
}

/* ===== LAYOUT ===== */

body {
    font-family: Arial, sans-serif;
    background: var(--bg);
    color: var(--text);

    margin: 0;
    min-height: 100vh;
    padding: 20px;

    display: flex;
    justify-content: center;
    align-items: center;

    transition:
        background 0.25s ease,
        color 0.25s ease;
}

/* ===== CARD ===== */

.container {
    background: var(--card);

    width: 100%;
    max-width: 320px;

    padding: 24px;
    border-radius: 12px;

    border: 1px solid var(--border);

    box-shadow: 0 0 0 1px rgba(255,255,255,0.03);

    text-align: center;

    transition:
        background 0.25s ease,
        border-color 0.25s ease;
}

/* ===== HEADINGS ===== */

h2 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--text);
}

/* ===== INPUTS ===== */

input[type="text"],
input[type="password"] {
    width: 100%;
    box-sizing: border-box;

    padding: 10px;
    margin-bottom: 15px;

    border: 1px solid var(--border);
    border-radius: 6px;

    font-size: 14px;

    background: var(--card);
    color: var(--text);
}

/* ===== BUTTONS ===== */

input[type="submit"],
button {
    width: 100%;

    padding: 10px 15px;
    margin-bottom: 15px;

    border: none;
    border-radius: 6px;

    font-size: 14px;

    background: var(--primary);
    color: white;

    cursor: pointer;

    transition: background 0.2s ease;
}

input[type="submit"]:hover,
button:hover {
    background: var(--primary-hover);
}

/* ===== TEXT ===== */

p {
    color: var(--muted);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ========================= */
/* 📱 MOBILE */
/* ========================= */

@media (max-width: 480px) {
    body {
        padding: 15px;
    }

    .container {
        max-width: 100%;
        padding: 20px;
    }
}