.instig-otp-modal-backdrop {
    position: fixed; inset: 0; background: rgba(0,0,0,0.65);
    display: flex; align-items: center; justify-content: center;
    z-index: 999999;
}
.instig-otp-modal {
    background: #fff; border-radius: 12px; padding: 28px;
    width: 360px; max-width: calc(100vw - 32px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    font-family: -apple-system, "Segoe UI", "Microsoft JhengHei", sans-serif;
    box-sizing: border-box;
}
.instig-otp-modal h3 { margin: 0 0 8px; font-size: 18px; }
.instig-otp-modal p { margin: 0 0 16px; color: #555; font-size: 14px; }
.instig-otp-modal .instig-otp-phone-display {
    font-weight: bold; color: #222; letter-spacing: 0.5px;
}
.instig-otp-modal .instig-otp-input-row {
    display: flex; justify-content: space-between; gap: 6px; margin-bottom: 16px;
}
.instig-otp-modal .instig-otp-input-row input {
    width: 40px; height: 48px; text-align: center; font-size: 22px;
    border: 1px solid #ccc; border-radius: 6px; padding: 0;
    box-sizing: border-box;
}
.instig-otp-modal .instig-otp-input-row input:focus {
    outline: none; border-color: #0073aa; box-shadow: 0 0 0 2px rgba(0,115,170,0.2);
}
.instig-otp-modal .instig-otp-error {
    color: #d63638; font-size: 13px; margin-bottom: 12px; min-height: 18px;
}
.instig-otp-modal .instig-otp-actions {
    display: flex; justify-content: space-between; align-items: center;
}
.instig-otp-modal .instig-otp-actions button {
    cursor: pointer; padding: 8px 14px; font-size: 14px; border-radius: 6px;
    border: 1px solid transparent;
}
.instig-otp-modal .instig-otp-resend {
    background: transparent; color: #0073aa;
}
.instig-otp-modal .instig-otp-resend:disabled { color: #aaa; cursor: default; }
.instig-otp-modal .instig-otp-close {
    background: transparent; color: #666; border-color: #ccc;
}