:root {
    --bt-primary:  #0a2e5c;
    --bt-accent:   #1a6bbf;
    --bt-success:  #2e7d32;
    --bt-error:    #c62828;
    --bt-border:   #d0d7e2;
    --bt-bg:       #f4f7fb;
    --bt-radius:   8px;
    --bt-shadow:   0 2px 12px rgba(10,46,92,.10);
}

#bt-wrap { max-width: 600px; margin: 0 auto; font-family: inherit; }

.bt-notice { padding: 12px 16px; border-radius: var(--bt-radius); margin-bottom: 20px; font-size: 14px; }
.bt-notice.info  { background: #e8f0fe; border-left: 4px solid var(--bt-accent); color: #0a2e5c; }
.bt-notice.error { background: #fce8e6; border-left: 4px solid var(--bt-error);  color: #b71c1c; }

#bt-form {
    background: #fff;
    border: 1px solid var(--bt-border);
    border-radius: var(--bt-radius);
    padding: 28px 32px;
    box-shadow: var(--bt-shadow);
}

.bt-field { display: flex; flex-direction: column; margin-bottom: 16px; }
.bt-field label { font-size: 13px; font-weight: 600; color: #333; margin-bottom: 5px; }
.bt-field small { font-weight: 400; color: #777; font-size: 12px; }
.req { color: var(--bt-error); }

.bt-field input[type="text"],
.bt-field input[type="tel"],
.bt-field input[type="file"],
.bt-field textarea {
    border: 1px solid var(--bt-border);
    border-radius: 6px;
    padding: 9px 12px;
    font-size: 14px;
    transition: border-color .2s, box-shadow .2s;
    background: #fff;
    width: 100%;
    box-sizing: border-box;
}

.bt-field input:focus,
.bt-field textarea:focus {
    outline: none;
    border-color: var(--bt-accent);
    box-shadow: 0 0 0 3px rgba(26,107,191,.15);
}

.bt-field input.is-invalid,
.bt-field textarea.is-invalid { border-color: var(--bt-error); }

.bt-err { font-size: 12px; color: var(--bt-error); margin-top: 4px; min-height: 16px; }

.bt-btn-primary {
    background: var(--bt-primary);
    color: #fff;
    border: none;
    padding: 12px 28px;
    border-radius: var(--bt-radius);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s;
    width: 100%;
}
.bt-btn-primary:hover:not(:disabled) { background: var(--bt-accent); }
.bt-btn-primary:disabled { opacity: .6; cursor: not-allowed; }

.bt-success-box {
    text-align: center;
    padding: 40px 20px;
    background: #fff;
    border: 1px solid var(--bt-border);
    border-radius: var(--bt-radius);
}
.bt-success-icon { font-size: 56px; margin-bottom: 12px; }
.bt-success-box h3 { color: var(--bt-success); font-size: 22px; margin-bottom: 8px; }
.bt-success-note { color: #555; font-size: 14px; line-height: 1.6; margin: 0; }