:root {
    --primary-color: #24db24;
    --primary-dark: #1eb81e;
    --text-main: #333;
    --text-sub: #666;
    --bg-color: #f0f2f5;
    --white: #ffffff;
    --border-color: #e1e1e1;
    --error-bg: #ffebee;
    --error-text: #c62828;
    --success-bg: #e8f5e9;
    --success-text: #2e7d32;
}

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

body {
    font-family: 'Be Vietnam Pro', sans-serif;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* Container chính */
.auth-container {
    background: var(--white);
    width: 100%;
    max-width: 420px;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

/* Header */
.auth-header { text-align: center; margin-bottom: 30px; }
.logo-icon svg { stroke: var(--primary-color); margin-bottom: 10px; }
.auth-header h2 { font-size: 24px; color: var(--text-main); margin-bottom: 5px; }
.auth-header p { font-size: 14px; color: var(--text-sub); }

/* Form Styles */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 8px; color: var(--text-main); }
.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    outline: none;
    transition: all 0.3s;
}
.form-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(36, 219, 36, 0.15);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    font-weight: 700;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
    text-shadow: 0 1px 1px rgba(0,0,0,0.1);
}
.btn-primary:hover { background-color: var(--primary-dark); }
.btn-primary:disabled { background-color: #ccc; cursor: wait; }

/* Links & Footer */
.form-footer { text-align: center; margin-top: 20px; font-size: 14px; color: var(--text-sub); }
.form-footer a { color: var(--primary-dark); text-decoration: none; font-weight: 600; }
.form-footer a:hover { text-decoration: underline; }

/* Utilities */
.hidden { display: none !important; }
.info-text { text-align: center; margin-bottom: 20px; font-size: 14px; color: var(--text-sub); background: #f9f9f9; padding: 10px; border-radius: 8px; }

/* Message Box */
.message { padding: 12px; border-radius: 8px; font-size: 14px; text-align: center; margin-bottom: 20px; }
.message.error { background: var(--error-bg); color: var(--error-text); }
.message.success { background: var(--success-bg); color: var(--success-text); }

/* Responsive Mobile */
@media (max-width: 480px) {
    .auth-container { padding: 25px 20px; box-shadow: none; background: transparent; }
    .form-group input { background: var(--white); }
}